Durel Division 2225 W. Chandler Blvd. Chandler, AZ 85224-6155 Tel: 480.917.6000 / FAX: 480.917.6049 www.rogerscorporation.com D391A Electroluminescent Lamp Driver IC Features • • • • • • New Patented Low Noise Wave Shape Output Over Voltage Protection High Power and Efficiency External Clock Compatible High Performance With Low-profile Coils Lead-Free (Pb-free) and Green MSOP / DFN Packages Rogers DUREL® D391A driver is part of a family of highly integrated EL drivers based on Rogers’ patented three-port (3P) topology, which offers builtin EMI shielding. This high-performance device uses a proprietary circuit design to produce a low-noise wave shape for low-noise performance in applications that are sensitive to audible and electrical noise. Applications DFN-10 / MSOP-10 DFLXTM EL Keypad Lamps Cellular Phones and Handsets Data Organizers/PDAs Monochrome LCDs Remote Controls Lamp Driver Specifications: Parameter Supply Current Enable Current Output Voltage Lamp Frequency Inductor Frequency Symbol I IENA VOUT LF HF Minimum Typical* 0 37 1.3 3.3 170 196 280 318 60 71 Maximum Units 45 mA V 220 VPP 350 Hz 80 kHz Conditions E = 3.3V+ V+= 1.3V E = 3.3V+ CLF = 2.0nF CHF = 120pF (Using Standard Test Circuit at Ta=250C unless otherwise specified) *Typical values should not be used for specification limits Standard Test Circuit 120pF CHF 1 6 V+ 2.0nF CLF 2 7 L+ E 3 8 3.3V ON GND OFF N/C 4 GND 5 D391A LOAD B +3.3V 0.1uF Vout 1.0nF 9 L- 10 N/C 220uH/ 1.44 Ohms DCR Patent #7,190,600 The information contained in this data sheet is intended to assist you in designing with Rogers EL systems. It is not intended to and does not create any warranties, express or implied, including any warranty of merchantability or fitness for a particular purpose or that the results shown on the data sheet will be achieved by a user for a particular purpose. The user should determine the suitability of Rogers’ EL systems for each application. LIT-I9076 A02 Page 1 of 15 Load B* Typical Output Waveform 47 nF 100 Ω 22 nF 10 kΩ *Load B approximates a 5in2 (32.3cm2) EL lamp. Absolute Maximum Ratings: Parameter Supply Voltage Operating Range Withstand Range Enable Voltage Output Voltage CHF Voltage CLF Voltage Operating Temperature Storage temperature Symbol V+ E VOUT VCHF VCLF TA TS Minimum Maximum 2.0 -0.4 1.3 7.0 7.0 V+ 220 V++0.3 V++0.3 85 150 0 0 -40 -55 Unit V V Vpp V V °C °C Comments E=V+ E=GND Peak-to-Peak voltage External Clock input External Clock input Note: The above table reflects stress ratings only. Functional operation of the device at these ratings or any other above those indicated in the specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. Physical Data: 1 10 2 9 3 8 4 7 5 6 MSOP10 1 6 2 7 3 8 4 9 5 10 D391A DFN10 MSOP10 and DFN10 Pin Description PIN # NAME 1 CHF 2 3 4 5 6 7 8 9 10 CLF E N/C GND N/C LVOUT L+ V+ FUNCTION High frequency oscillator capacitor/clock input Lamp frequency capacitor/clock input System enable No Connect, recommend grounding System ground connection No Connect, recommend grounding Negative input to inductor High voltage AC output to lamp Positive input to inductor DC power supply input Note: The center pad on the DFN10 package is a thermal pad and should be connected to ground. The information contained in this data sheet is intended to assist you in designing with Rogers EL systems. It is not intended to and does not create any warranties, express or implied, including any warranty of merchantability or fitness for a particular purpose or that the results shown on the data sheet will be achieved by a user for a particular purpose. The user should determine the suitability of Rogers’ EL systems for each application. LIT-I9076 A02 Page 2 of 15 400 400 350 350 300 300 250 250 LF (Hz) LF (Hz) Typical Performance Characteristics 200 150 200 150 100 100 50 50 0 0 2 3 5 6 7 -40 0 20 40 60 Temperature (°C) Output Frequency vs. DC Supply Voltage Output Frequency vs. Ambient Temperature 80 240 Output Voltage Protection = 220 Vpp 200 160 120 80 40 200 160 120 80 40 0 0 2 3 4 5 6 -40 7 -20 0 20 40 60 DC Input Voltage (V) Temperature (°C) Output Voltage vs. DC Supply Voltage Output Voltage vs. Ambient Temperature 80 50 Avg Supply Current (mA) 50 Avg Supply Current (mA) -20 DC Input Voltage (V) Output Voltage (Vpp) Output Voltage (Vpp) 240 4 40 30 20 10 0 40 30 20 10 0 2 3 4 5 6 7 -40 -20 0 20 40 60 DC Input Voltage (V) Temperature (°C) Supply Current vs. DC Supply Voltage Supply Current vs. Ambient Temperature 80 The information contained in this data sheet is intended to assist you in designing with Rogers EL systems. It is not intended to and does not create any warranties, express or implied, including any warranty of merchantability or fitness for a particular purpose or that the results shown on the data sheet will be achieved by a user for a particular purpose. The user should determine the suitability of Rogers’ EL systems for each application. LIT-I9076 A02 Page 3 of 15 Block Diagram of the Driver Circuitry Theory of Operation Electroluminescent (EL) lamps are essentially capacitors with one transparent electrode and a special phosphor material in the dielectric. The phosphor glows when a strong AC voltage is applied across the EL lamp electrodes. The required AC voltage is usually not present in most systems and must be generated from a low voltage DC source. Rogers developed its patented three-port (3P) switch-mode inverter circuit to convert the available DC supply to an optimal drive signal for high brightness and low-noise EL lamp applications. Rogers’ 3P topology offers the simplicity of a single DC input, single AC output, and a shared common ground that provides an integrated EMI shielding. The D391A IC drives the EL lamp by repeatedly pumping charge through an external inductor with current from a DC source and discharging into the capacitance of the EL lamp load. With each high frequency (HF) cycle the voltage on the lamp is increased. At a period specified by the lamp frequency (LF) oscillator, the voltage on the lamp is discharged to ground and the polarity of the inductive charging is reversed. By this means, an alternating positive and negative voltage is developed at the single output lead of the device to one of the electrodes of the EL lamp. The other lamp electrode is commonly connected to a ground plane, which can then be considered as electrical shielding for any underlying circuitry in the application. The EL driving system is divided into several parts: on-chip logic and control, on-chip high voltage output circuitry, discharge logic circuitry, and off-chip components. The on-chip logic controls the lamp operating frequency (LF), as well as the inductor switching frequency (HF), and HF and LF duty cycles. These signals are combined and buffered to regulate the high voltage output circuitry. The output circuitry handles the power through the inductor and delivers the high voltage to the lamp. The integrated discharge logic circuit enables the lownoise functionality of this EL driver with four levels of discharge slopes on the output waveform. The selection of off-chip components provides a degree of flexibility to accommodate various lamp sizes, system voltages, and brightness levels. Since a key objective for EL driver systems is to save space and cost, required off-chip components are kept to a minimum. The information contained in this data sheet is intended to assist you in designing with Rogers EL systems. It is not intended to and does not create any warranties, express or implied, including any warranty of merchantability or fitness for a particular purpose or that the results shown on the data sheet will be achieved by a user for a particular purpose. The user should determine the suitability of Rogers’ EL systems for each application. LIT-I9076 A02 Page 4 of 15 Rogers provides a D391A IC Designer’s Kit, which includes a printed circuit evaluation board intended to aid you in developing an EL lamp driver configuration that meets your requirements using the D391A IC. A section on designing with the D391A IC is included in this datasheet to serve as a guide to help you select the appropriate external components to complete your D391A EL driver system. Reference D391A EL Driver Configurations: 100pF CHF Characteristic Output Luminance = 7.50 fL (25.70 cd/m2) Lamp Frequency = 312 Hz Supply Current = 17 mA Vout = 180 Vpp Load: 1.28 in2 (824 mm2) DUREL DFLX 3.0V Handset LCD Characteristic Output Luminance = 8.65 fL (29.65 cd/m2) Lamp Frequency = 414 Hz Supply Current = 16 mA Vout = 170 Vpp Load: 1.5 in2 (950 mm2) DUREL 3 Green EL V+ 2 7 L+ 3 8 N/C 4 9 L- GND 5 10 N/C ON E OFF D391A 3.3 Mohm 3.3nF CLF Characteristic Output Luminance = 6.60 fL (12.5 cd/m2) Lamp Frequency = 195 Hz Supply Current = 25 mA Vout = 198 Vpp Load: 3.3in2 (2129 mm2) DUREL DFLX-P Full Lit Surface Blue EL 3.3V Handset DFLX Keypad 6 1 3.3 in2 DFLX Lamp Flooded 120pF CHF 2.0nF ON OFF CLF 2 7 L+ E 3 8 Vout N/C 4 9 L- GND 5 10 N/C 1.28 in2 DFLX Lamp 1 6 V+ 1.5nF CLF 2 7 L+ E 3 8 Vout N/C 4 9 L- GND 5 10 N/C OFF D391A 1.5 in 2 EL Lamp 3.3V 1.0uF 0.47mH Coilcraft LPO6013 1.0nF 1.0uF 10V 120pF CHF ON 0.22mH Sejin SPI-3RD V+ 6 D391A 3.0V 1.0uF 1.0nF 1.0uF 10V 1 3.3 Mohm 3.0V Handset DFLX Keypad 3.0V 1.0uF 0.47mH Murata LQH4N 1.0nF The information contained in this data sheet is intended to assist you in designing with Rogers EL systems. It is not intended to and does not create any warranties, express or implied, including any warranty of merchantability or fitness for a particular purpose or that the results shown on the data sheet will be achieved by a user for a particular purpose. The user should determine the suitability of Rogers’ EL systems for each application. LIT-I9076 A02 Page 5 of 15 Designing With A D391A EL Driver IC: I. Lamp Frequency Capacitor (CLF) Selection Lamp Frequency (Hz) The output frequency of the D391A EL driver is determined by the lamp frequency capacitor (CLF) selected. Lamp frequencies of 200-500Hz are normally used. Figure 1 graphically represents the inversely proportional relationship between the CLF capacitor value and the oscillator frequency. 1000 900 800 700 600 500 400 300 200 100 0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 CLF (nF) Figure 1—Typical lamp frequency vs. CLF capacitor Alternatively, the lamp frequency may also be controlled with an external clock signal. There is an internal frequency divider in the device so that the output lamp frequency will be onesixteenth (6.25%) of the input clock signal. For example, if a 3.2 kHz input clock signal is used the resulting lamp frequency will be 200Hz. The clock signal input voltage should not exceed V+. The selection of the CLF value can also affect the brightness of the EL lamp as it controls the lamp frequency (LF). Although input voltage and lamp size can change EL lamp frequency as well, LF mainly depends on the CLF value selected or the frequency of the input clock signal to CLF. Figure 2 shows typical brightness of a D391A IC circuit with respect to lamp frequency. In this example, the inductor and CHF values were kept constant while varying LF. Lamp Luminance (fL) 7 6 5 4 3 2 1 0 0 200 400 600 800 1000 Lamp Frequency (Hz) Figure 2— Luminance vs. lamp frequency (V+ = 3.0V, 2.4 in2 DUREL 3 Green EL Lamp Load) The information contained in this data sheet is intended to assist you in designing with Rogers EL systems. It is not intended to and does not create any warranties, express or implied, including any warranty of merchantability or fitness for a particular purpose or that the results shown on the data sheet will be achieved by a user for a particular purpose. The user should determine the suitability of Rogers’ EL systems for each application. LIT-I9076 A02 Page 6 of 15 II. High Frequency Capacitor (CHF) Selection The high frequency capacitor (CHF) will set the inductor switching frequency of the D391A IC. High inductor frequency allows for more efficient use of inductor coils with lower values. However, care must be taken that the charge pumping does not reach a continuous mode at very high frequency when the voltage is not efficiently transferred to the lamp load. Figure 3 graphically represents the effect of the CHF value on the oscillator frequency. Inductor Frequency (kHz) 250 200 150 100 50 0 0 100 200 300 400 500 600 CHF (pF) Figure 3—Typical inductor frequency vs. CHF capacitor The inductor switching frequency may also be controlled with an external clock signal. The inductor will charge during the low portion of the clock signal and discharge into the EL lamp during the high portion of the clock signal. The positive duty cycle used for the external high frequency clock signal is usually between 15%-75%, with a typical value of 15%-20% for maximum brightness. The clock signal input voltage should not exceed V+. III. Inductor (L) Selection The inductor value and inductor switching frequency have the greatest impact on the output brightness and current consumption of the EL driver. Figure 4 and Figure 5 on the following page show the dependence of brightness and current draw of a D391A IC circuit on coil values and CHF values for two sample EL lamp sizes and input voltages. The CHF value was chosen such that the output voltage did not exceed 220Vpp. Note that the DC resistance (DCR) of inductors with the same nominal inductance value may vary with manufacturer and inductor type. Therefore, inductors made by a different manufacturer may yield different outputs, but the trend of the different curves should be similar. The information contained in this data sheet is intended to assist you in designing with Rogers EL systems. It is not intended to and does not create any warranties, express or implied, including any warranty of merchantability or fitness for a particular purpose or that the results shown on the data sheet will be achieved by a user for a particular purpose. The user should determine the suitability of Rogers’ EL systems for each application. LIT-I9076 A02 Page 7 of 15 14 70 100 pF Luminance 68 pF 10 60 Luminance 50 100 pF Current 68 pF 8 Current C urrent (m A ) Lam p Lum inance (fL) 12 40 6 30 4 20 2 10 0 0 0 0.5 1 1.5 2 2.5 Inductor (mH) Figure 4—Luminance and current vs. inductor and CHF Value (Conditions: V+=3.0V, 2in2 EL Lamp) 14 70 100 pF Luminance 68 pF 10 60 Luminance 50 100 pF Current 68 pF 8 Current 40 6 30 4 20 2 10 0 Current (mA) Lamp Luminance (fL) 12 0 0 1 2 3 4 5 Inductor (mH) Figure 5—Luminance and current vs. inductor and CHF value (Conditions: V+=5.0V, 4in2 EL Lamp) IV. D391A IC Operating Considerations The following recommendations should be considered when designing and testing the D391A IC device to ensure that the devices are not damaged. 1) An EL driver system using the D391A IC driver need to be designed with an output capacitor in parallel with Vout pin to GND. Place the output capacitor close to the IC. The high voltage capacitor should rate for minimum of 100V. This is use to reduce high frequency spikes caused by high impedance seen at the Vout pin and prevent open load conditions. 2) The DC input supply voltage (V+) should be applied to the V+ pin of the D391A IC prior to the application of the enable signal high to pin 3. Conversely, when powering off the device, the enable signal must be low prior to the removal of V+ signal. 3) Prevent voltage spikes at V+. Place the V+ decoupling capacitor close to the IC. Avoid long wires from the V+ power supply to the IC in the test environment. The information contained in this data sheet is intended to assist you in designing with Rogers EL systems. It is not intended to and does not create any warranties, express or implied, including any warranty of merchantability or fitness for a particular purpose or that the results shown on the data sheet will be achieved by a user for a particular purpose. The user should determine the suitability of Rogers’ EL systems for each application. LIT-I9076 A02 Page 8 of 15 D391A IC Design Ideas: I. DC Bias Elimination Circuit Semiconductor inverters will inherently induce a small DC bias across the electrodes of the EL lamp. Elimination of DC bias in specific EL driving systems may improve performance and prolong overall operation of the system. The Rogers patented (#7,009,346) DC bias elimination circuit is a high pass filter connected between the Vout pin and EL lamp as shown below. CHF 1 6 V+ CLF 2 7 L+ E 3 8 N/C 4 9 L- GND 5 10 N/C VBAT Vout 3.3 Mohm DFLX Lamp D391A L 1.0uF 10V 1.0nF DC Bias Elimination Components Patent #7,009,346 II. Driving Multiple EL Lamps The D391A IC may be used to drive multiple EL lamp segments. An external transistor switching circuit is used to turn each lamp segment on or off independently or simultaneously. A high signal at the corresponding E input will enable the corresponding lamp segment. In this configuration, EL Lamp 1 is always turned on when the IC is enabled. Otherwise, always make sure that at least one lamp segment is selected to be on when the D391A IC is enabled. The information contained in this data sheet is intended to assist you in designing with Rogers EL systems. It is not intended to and does not create any warranties, express or implied, including any warranty of merchantability or fitness for a particular purpose or that the results shown on the data sheet will be achieved by a user for a particular purpose. The user should determine the suitability of Rogers’ EL systems for each application. LIT-I9076 A02 Page 9 of 15 III. Two-level Dimming Two level dimming may be achieved using the circuit configuration shown below. When DIM is low, the external PNP transistor is saturated and the EL lamp runs at full brightness. When DIM is high, the external PNP turns off and the 47Ω resistor reduces the voltage at (V+) and dims the EL lamp. IV. Lamp Frequency Control with an External Clock Signal An external clock signal may be used to control the EL lamp frequency (LF) of the D391A IC instead of using a capacitor. There is an internal frequency divider in the IC, however, so the output lamp frequency will be one-sixteenth (6.25%) of the input clock signal. For example, if a 3.2kHz input clock signal is used, the resulting lamp frequency will be 200Hz. The clock signal voltage should not exceed V+. A typical duty cycle for the clock input is +50%. The information contained in this data sheet is intended to assist you in designing with Rogers EL systems. It is not intended to and does not create any warranties, express or implied, including any warranty of merchantability or fitness for a particular purpose or that the results shown on the data sheet will be achieved by a user for a particular purpose. The user should determine the suitability of Rogers’ EL systems for each application. LIT-I9076 A02 Page 10 of 15 V. EL Brightness Control through HF Clock Pulse Width Modulation The inductor oscillating frequency may also be controlled on the D391A IC driver using an external clock input to CHF. In addition, pulse-width modulation of the external HF clock signal to the D391A IC may be used to regulate the brightness of the EL lamp load. High frequency input is usually in the range of 25kHz to 100kHz, with duty cycle in the range of 15% to 75%. In general, a lower duty cycle results in higher brightness. The clock signal voltage should not exceed V+. Prior to finalization of the circuit, contact Rogers to verify that the frequency, duty cycle, and setup chosen are acceptable for EL driver performance. VI. Fade ON Fade OFF Output Control When the EL lamp is changing from on to off a fading option can be implemented using frequency control as an RC circuit on the CHF pin. The option of fading is separate from the enabling of the EL drive utilizing the E pin logic. The added circuitry shown below can be optimized to control the time interval of fading off (C1 and R1) as well as the interval of fading on (C1 and R2). The application of D1 is optional with respect to the control system applied for fading on and off. If the system does not have an internal diode other than D1, there may be an undesired current flow from the inverter driver to the control system during a low signal. Typical Circuit Values The information contained in this data sheet is intended to assist you in designing with Rogers EL systems. It is not intended to and does not create any warranties, express or implied, including any warranty of merchantability or fitness for a particular purpose or that the results shown on the data sheet will be achieved by a user for a particular purpose. The user should determine the suitability of Rogers’ EL systems for each application. LIT-I9076 A02 Page 11 of 15 Solder Re-Flow Recommendations Pb-Free Assembly Profile Feature Average ramp-up rate (TL to TP) Preheat -Temperature Min (Tsmin) -Temperature Max (Tsmax) -Time (min to max) (ts) Tsmax to TL -Ramp-up Rate Time maintained above: Temperature (TL) -Time (TL) Peak Temperature (TP) Time within 5°C of actual Peak Temperature (TP) Ramp-down Rate Time 25°C to Peak Temperature 1DDD381BB-NL2 1DDD381BB-NL4 1DDD381BB-PO5 3°C/second max. 150°C 200°C 60-180 seconds 3°C/second max. 217°C 60-150 seconds 250 +0/-5°C 20-40 seconds 6°C/second max. 8 minutes max. Note: All Temperatures refer to topside of the package, measured on the package body surface Note: All Temperatures refer to IPC/JEDEC J-STD-020B The information contained in this data sheet is intended to assist you in designing with Rogers EL systems. It is not intended to and does not create any warranties, express or implied, including any warranty of merchantability or fitness for a particular purpose or that the results shown on the data sheet will be achieved by a user for a particular purpose. The user should determine the suitability of Rogers’ EL systems for each application. LIT-I9076 A02 Page 12 of 15 Ordering Information The D391A IC is available in Pb-free green MSOP-10 and DFN-10 packages in tape and reel. A DUREL D391A IC Designer’s Kit (1DDD391AA-K01) provides a vehicle for evaluating and identifying the optimum component values for any particular application using D391A IC. Rogers’ engineers also provide full support to customers, including specialized circuit optimization and application retrofits. F I H D E C A G B A B C D E F G H I Min mm in 0.92 0.036 0.05 0.002 0.15 0.006 0.40 0.016 0.13 0.005 2.90 0.114 0.35 0.014 4.75 0.187 2.90 0.114 A B C D E F G H I Min mm in 0.70 0.028 0.18 0.007 0.20 0.0077 1.92 0.076 1.55 0.061 0.35 0.014 0.50 0.020 2.95 0.116 2.95 0.116 I H D G F E A B C MSOP-10 Typical mm in 1.00 0.039 0.10 0.004 0.23 0.009 0.55 0.022 0.18 0.007 3.00 0.118 0.50 0.020 4.90 0.193 3.00 0.118 DFN-10 Typical mm in 0.75 0.030 0.25 0.010 0.203 0.0080 2.00 0.079 1.6 0.063 0.40 0.016 0.5 0.020 3.00 0.118 3.00 0.118 Max mm in 1.08 0.043 0.15 0.006 0.31 0.012 0.70 0.028 0.23 0.009 3.10 0.122 0.65 0.026 5.05 0.199 3.10 0.122 Max mm in 0.8 0.031 0.3 0.012 0.211 0.0083 2.05 0.081 1.65 0.065 0.45 0.018 0.5 0.020 3.05 0.120 3.05 0.120 The information contained in this data sheet is intended to assist you in designing with Rogers EL systems. It is not intended to and does not create any warranties, express or implied, including any warranty of merchantability or fitness for a particular purpose or that the results shown on the data sheet will be achieved by a user for a particular purpose. The user should determine the suitability of Rogers’ EL systems for each application. LIT-I9076 A02 Page 13 of 15 b a c e f d a b c d e f b a g c e d f MSOP-10 PAD LAYOUT Typical Max mm in mm in mm in 0.50 0.0197 2.00 0.0787 3.3 0.130 3.45 0.136 0.89 0.035 0.97 0.038 1.05 0.041 5.26 0.207 5.41 0.213 0.30 0.012 DFN-10 PAD LAYOUT Min Typical Max mm in mm in mm in 0.50 0.020 1.90 0.075 2.00 0.079 2.10 0.083 1.90 0.075 0.45 0.018 0.55 0.022 0.65 0.026 3.00 0.118 0.18 0.007 0.25 0.010 0.30 0.012 1.60 0.063 1.62 0.064 1.65 0.065 2.35 0.093 2.37 0.093 2.40 0.094 Min h a b c d e f g h MSOP-10 Lead Free 1DDD391AA-NL4 MSOP: Embossed tape on 330mm diameter reel per EIA-481-2. 2500 units per reel. PN: 1DDD391AA-NL4 391A XXXX Tape Orientation DFN-10 Lead Free 1DDD391AA-PO5 DFN: Embossed tape on 330mm diameter reel. 2500 units per reel. PN: 1DDD391AA-P05 391A XXXX Tape Orientation The information contained in this data sheet is intended to assist you in designing with Rogers EL systems. It is not intended to and does not create any warranties, express or implied, including any warranty of merchantability or fitness for a particular purpose or that the results shown on the data sheet will be achieved by a user for a particular purpose. The user should determine the suitability of Rogers’ EL systems for each application. LIT-I9076 A02 Page 14 of 15 ISO 9001:2000, ISO/TS 16949:2002, and ISO 14001:1996 Certified The information contained in this data sheet is intended to assist you in designing with Rogers EL systems. It is not intended to and does not create any warranties, express or implied, including any warranty of merchantability or fitness for a particular purpose or that the results shown on the data sheet will be achieved by a user for a particular purpose. The user should determine the suitability of Rogers’ EL systems for each application. Rogers EL drivers are covered by one or more of the following U.S. patents #5,313,141; #5,789,870; #5,677,599; #6,043,610, #7,009,346, #7,190,600. Corresponding foreign patents are issued or pending. The world runs better with Rogers. is a licensed trademark of Rogers Corporation DUREL, DFLX and PROTOLIGHT are licensed trademarks of Rogers Corporation ©2007, 2008 Rogers Corporation. Printed in U.S.A All Rights Reserved ® The world runs better with Rogers. Revised 06/2008 Publication #LIT-I9076 A02