Zetex Lighting Solutions
June 2007
www.zetex.com
Agenda

Lighting
–
–
–
–
LED Lighting
Applications - today and tomorrow
What is required for LED drive
Zetex Lighting Solution
 High Power LED Drivers- Integrated Switches – High Current
– ZXLD13xx Summary
– ZXLD1360 Introduction
 Portable applications Part I - External switch
– Portable LED Driver Solution Overview
– ZXSC310 Solution
–
ZXSC380 Solution
– ZXSC400 Solution

Design Tools
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LED Applications - Overview

Illumination - General, Object/Task, Decorative, Home/Garden,
Commercial/Industrial, Indoor/Outdoor…

Emergency and security - Signage, Torch,
Hazard flash lights, Emergency lights…

Signage - General, Traffic lights and signs…

Portables - Camera/Mobile Backlight, Torch/Flash, Effect, Projector, Toys…

Displays - LED displays, Backlight, Projector, RGB Direct TV etc

Architectural and Effect - Colour, Patterns, Mood lighting,
Bridges/Monuments/Buildings, Addressable RGB points etc

Street lights

Automotive

Many more…
All pictures copyright
acknowledge
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Characteristics of a Good LED Driver
LED Drivers are responsible for driving the CURRENT through the LED!
Anything else is an artifact you do not want…
 Programmable LED current
 High efficiency: 94%
– Low 100mV feedback voltage for high efficiency
– <5µA shutdown current
 Simple to use
 Space efficient
 Adds value to the LED
–
–
–
–
–
Dimming
Thermal control
Good EMC
Robust
Copes with the VF variation of the LED
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Zetex LED Driver ICs
 Portable Lighting ICs
–
LED Controllers (Requiring External Switch)
• ZXSC3xx / 4xx series
– Boost LED Driver: ZXLD11xx /19xx series/ZXSC38x
– Boost converters for LCD / OLED bias: ZXLB16xx / ZXLD16xx series
– Charge-Pump LED Driver for Mobile Phone Backlight: ZXLD1575
 Mid Voltage Range for High Power LED
Device
ZXSC3xx
ZXSC4xx
ZXLD 1350
ZXLD 1360
ZXLD 1362
Vin
0.8 – 8V
1.8 – 10V
7 – 30V*
7– 30V*
7 – 60V**
*
**
***
Switch
External
External
Internal
Internal
Internal
LED Current/Vout
Switch dependent
Switch dependent
350mA /<30V
1000mA/<30V
1000mA/ <60V
Topology
Boost
Boost***
Buck
Buck
Buck
Transient capability 40V for 0.5s
Transient capability 65V for 0.5s
Can also be operated in buck, buck-boost mode
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LED Lighting Solutions
Zetex ASSP LED Products
ZXLB1600
ZXLD1601
LCD- Small and Medium Screens,
Portable
ZXLD1615
ZXLD1101
ZXLD1937
ZXSC300: External switch
LCD - Large Screens, Illumination,
Architectural, Emergency and
Security, Portable, Signage,
Automotive etc
ZXSC400: External switch
ZXLD1350: Vin 30V Iout 350mA
ZXLD1360: Vin 30V Iout 1A
ZXLD1362: Vin 60V, Iout1A
OLEDs - Hand Portable Equipment
ZXLB1600
ZXLD1601
ZXLD1615
All Photographs Copyright
Acknowledged
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High Power LED Drivers
ZXLD13xx Buck LED Driver ICs – Integrated switch
Key Features


ZXLD1350, ZXLD1360, ZXLD1362…
Wide input voltage
–
–


ZXLD1350:
ZXLD1360/2:
Up to 350mA
Up to 1000mA
ZXLD1350:
ZXLD1360
ZXLD1362:
Up to 8 series connected 1WLEds
Up to 8 series connected 3WLEds
Up to 16 series connected 3WLEds
Sense resistor Rs:
ZXLD1350: 0.3W;
Low quiescent current ZXLD1350: 250uA typ.
Low shutdown current
–
–
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

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7V to 30V
7V to 60V
Can drive series connected LEDs
–
–
–


ZXLD1350, ZXLD1360:
ZXLD1362:
Internal NDMOS Switch
High LED Current
–
–

Typical Application circuit
ZXLD1350: 20uA max
ZXLD1360: 40uA max
Brightness control: DC or PWM dimming
Internal filter
Optional soft-start
Up to 1Mhz switching frequency
ZXLD1360/62: 0.1W
Schottky diode SD1
ZXLD1350: ZHCS1000/ZXLLS1000
Applications




General illuminations - Low voltage halogen
replacement, industrial lighting etc
Automotive
LED backlighting for LCD
Signage
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High Power LED Driver ICs with Integrated Switch ZXLD13xx Comparison
ZXLD1350
ZXLD1360
ZXLD1362
LX Pin drive current
370mA
1 Amp
1A
LX on resistance
1.5Ω
0.5Ω
0.5Ω
Supply voltage
7- 30V
7- 30V
7- 60V
Transient capability
40V 0.5 sec
40V 0.5 sec
65V 0.5 sec
Minimum Sense resistor
0R33
0R1
0R1
Package Dissipation
450mW
1000mW
1000mW
Output power capability
8 Watts
24 Watts
48 Watts
Regulator starts up @
4.8 Volts
5.6 Volts
5.6 Volts
Adjust pin clamp
No
Yes, 1.35V
Yes, 1.35V
Low Pass Filter
4kHz
4kHz
600kHz
Switching freq
1Mhz
1Mhz
1MHz
Excel Calculator
Yes
Yes
Yes
Status
Released
Released
Q3 2007
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ZXLD1360 1 Amp LED driver features

Low part count

1 Amp output current

7 to 30 Volt operation

Adjust pin for DC or PWM current control

In-built soft start which can be extended

Low value inductors

1 Watt TSOT 23-5 package

Can be shut down for power saving

Drive capability - 24 watts (8 LEDs in series)

Pin compatible with ZXLD1350

Under voltage lockout (5.5V)

Leakage current protected ADJ pin
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Basic circuit configuration

Vin 7 to 30V

Inductor - typical
value for 2 K2
LEDs at 1A from
12V supply –
33uH will oscillate
around 450kHz

Input capacitor
needs to be 4.7uF
X7R

Schottky diode
needs to be low
leakage and high
power rated
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LED Drivers ICs
Portable Applications
Device
Vin
Vout
Switch
Vfb &or Isense
Pkg
ZXLB1600
1.6 - 5.5V
Vin to 28V
Internal
1.23
MSOP10
ZXLD1100*
2.5 – 5.5V
to 28V
Internal
100mV
SC70-6
ZXLD1101
2.5 – 5.5V
28V max
Internal
100mV
TSOT23-5
ZXLD1937
2.5 – 5.5V
28V max
Internal
100mV
TSOT23-5
ZXLD1575
2.7 – 5.5V
5.5V
Internal
ZXLD1601*
2.5 - 5.5V
to 28V**
Internal
1V
SC70-6
ZXLD1615
2.5 -5.5V
Vin to 28V
Internal
1V
TSOT23
ZXSC380
0.8 - 6V
Vin to 20V
Internal
20mV
SOT23
-
External
NA / 20mV
SOT23-5
-
External
20mV/300mV
SOT23-6
ZXSC300/310 0.8 – 8V
ZXSC400
0.8 – 10V
QFN16
* Open load protected
** Default value but can be programmed for lower output value
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ZXSC310 Solution Single AA Cell to 1W Solution
Simple Solution, output current tapers down as input voltage falls
•
•
LED Current not fed back to controller
Switch current is monitored
Key Features



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Boost controller
Very high efficiency: >80%
0.8V to 8V input voltage
Constant power drive
Small size: SOT23-5
Simple circuit – low part counts
Low cost and easy to use
Many reference designs available
Typical application circuit
L1
VIN=3.3V / 5V
D1
D1
ZHCS1000
U1
Vcc
Q1
FMMT618
Vdrive
Stdn
Isense
D2
C1
D3
Gnd
ZXSC310
R1
D4
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ZXSC380 Solution Overview
Very simple solution, output current tapers down as input voltage falls
• Target market – toys, flashlights, garden lighting
V
• LED current not fed back to controller
L1
• Switch current is monitored
100u
IN
V
CC
Key features:
V

OUT
LED
Very high efficiency: >80%
GND

0.8V to 6V input voltage
– – single cell operation capable

200mA integrated switch

Constant power drive to LED
ZXSC380
Vin
3
1

Small size: SOT23
Vout
Gnd
2
Key applications:

LED solar garden lights
and effects
Low cost

Toys, Instruments etc
Reference designs and evaluation boards available

Single cell applications

Simple circuit – low parts count


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ZXSC400 Solution Overview
Simple Solution drive multiple LEDs
•
Regulates LED current
Key Features









Simple boost controller
Very high efficiency: >80%
1.8V to 8V input voltage
Regulated LED current: ±3%
Constant power drive to LED
Small size: SOT23-6
Dual Transistor and Schottky combination
available
Can be configured in
buck, buck-boost mode also
Simple low cost circuit – low part counts
Typical application circuit
U2
ZX3CDBS1M832
VIN = 2.5V to 4.2V
L1
C2
U1
ZXSC400
VCC VDRIVE
C1
STDN
ISENSE
GND
VFB
RSENSE

RLED
Many reference designs available
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Design Tools
 Design Tools
– Standard and ASSP ICs and
building block Datasheet and
brochures
•
–
–
–
–
–
–
–
–
–
–
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– pdf, web
Samples
Application and design notes
Reference designs
Demonstration boards
Spice models
Design calculators
Package and environmental
information
Related websites and documents
Exhibition panels
Zetex application engineers
www.zetex.com
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Lighting Evaluation Boards
Product Part Number
Description
EV Order Number
ZXLB1600X10
ZXLB1600 LCD & OLED Bias
#ZXLB1600EV1
ZXLD1100H6
ZXLD1100 LED driver board
#ZXLD1100EV1
ZXLD1100H6
Mobile LED Flash Unit - Osram LED
#ZXLD1100EV2
ZXLD1615ET5
ZXLD1615 LCD & OLED Bias
#ZXLD1615EV1
ZXLD1937ET5
ZXLD1937 LED driver boards
#ZXLD1937EV1
ZXSC310E5
ZXSC310 25mA LED driver board
#ZXSC310EV1
ZXSC410EV1
ZXSC410 DC-DC 5V/100mA Output
#ZXSC410EV1
ZXSC400E2
25W LED Driver Vin 24V I out 350mA boost
#ZXSC400EV2
ZXSC400E4
1W LED Driver - Osram LED
#ZXSC400EV4
ZXSC400E6
ZXSC400 LED 25mA 2 cell driver board
#ZXSC400EV1
ZXSC400E6
25W LED Driver Vin 24V I out 350mA boost
#ZXSC400EV2
ZXSC400E6
1W LED Driver - Lumileds LED
#ZXSC400EV3
ZXSC440X8
ZXSC440 Photoflash Charger
#ZXSC440EV1
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Lighting Evaluation Boards
Product Part Number
Description
EV Order Number
ZXLD1350EV2
3 X 1W LED Driver – step down 30V
#ZXLD1350EV2
ZXLD1350EV4
3 X 1W LED Driver – step down 30V
#ZXLD1350EV4
ZXLD1350EV6
LED Driver – step down 30V no LEDs
#ZXLD1350EV6
ZXLD1360EV1
1 X 3W LED Driver – step down 30V
#ZXLD1360EV1
ZXLD1360EV2
OSTAR with heat sink
#ZXLD1360EV2
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Thank you!
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