ICEpower
ICE250A
250W Power Amplifier
General Description
ICE250A has been designed using ICEpower®
technology to offer state-of-the-art audio
amplification.
With its full audio bandwidth ICE250A is the
natural choice in many audio applications such as:
• High end audio power amplifier systems.
• Active speakers and Subwoofers.
• Professional Audio / Public Address systems.
• Home Theater amplifiers / receivers.
• Powerful Car-Audio systems.
ICE250A using ICEpower Technology.
True high-end performance is achieved by the
patented ICEpower® Analog Technology based on
proprietary COM modulation and MECC control
techniques.
250W Power Amplifier
Size: 3.2”x3.2”x1”
ICE250A: PCB mountable component with pin
or connector interface
Performance features
Other features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
250W @ 0.05% THD+N, 1kHz, 2.7Ω.
Peak output current > 25A
114dBA dynamic range
THD = 0.0005% @ 250mW, 5kHz.
THD+N < 0.03%, 0.1W – 200W, 4Ω
Efficiency = 93% @ 100W / 8 Ω
Output impedance < 5mΩ @ 1kHz
Power Supply Rejection Ratio > 60dB
Vin+
No extra heatsink required
Soft clipping
Soft startup
Standby
Soft mute/demute
Under voltage protection
Monitor output
ICEpower®
Input filter
DC blocking
COM Pulse Modulation
MECC Error Correcton and Control
Vin-
Monitor
Mute
Vp
Vcc
Standby
Vss
Control/
Protection
Soft clipping
Mute
Power Conversion
Stage
with Demodulation
Vo+
Vo-
Disable
AGND
PGND
ICE250A block diagram
Bang & Olufsen PowerHouse a/s
Page 1 of 15
ICEpower
ICE250A
250W Power Amplifier
Connection Diagram
ICE250A-TP. PIN version
ICE250A-TC. Connector version
Power Pin Inteface
Signal Pin Interface
Signal Connector
8 7 6 5 4 3 2 1
8 77 6 5 4 3 2 1
Power
Connector
(Preliminary interface – will be finally defined by Ultimo 2000)
87654321
8 7 6 5
4 3 2 1
The plug interface for the ICE250A modules has two industry standard connectors that have been
selected for long term reliability. One power Molex Micro-FitTM connector is used for power input and
speaker output and one JST signal PH-connector is used for low level power supply, audio input and
module control. The pin interface is implemented with specially developed flexible pins that can tolerate
significant stress.
Power Connector Specification
PIN
7, 8
3, 4
5, 6
1, 2
Function
PGND
Vp
VoVo+
Description
Power GND for the single ended power supply input Vp
Power Supply (single) for the power stage (30V-50V)
“Cold” balanced power output terminals. In phase with Vi “Hot“ balanced power output terminals. In phase with Vi+
Signal Connector Specification
PIN
1
2
3
4
5
6
7
8
FUNCTION
Vcc
Vss
AGND
Monitor
Vi+
ViMute
Standby
Description
Positive power supply input for the signal section.
Negative power supply input for the signal section.
Analog ground terminal for the analog/signal section.
Unbalanced version of output signal.
Positive input (balanced input buffer).
Negative input (balanced input buffer).
Mute input
Control pin for standby control.
Ordering Information
Shape
H
T
I
Bang & Olufsen PowerHouse a/s
Connector Version (C)
Pin Version (P)
ICE250A-HC
ICE250A-HP
ICE250A-TC
ICE250A-TP
ICE250A-IC
Not Available
Page 2 of 15
ICEpower
ICE250A
250W Power Amplifier
Absolute Maximum Ratings
Absolute maximum ratings indicate limits beyond which damage may occur.
•
SYMBOL
PARAMETER
Vp
Vcc
Vss
Vin
tcase
ta
Rth,case-a
Rth,case-rib
t ZOBEL*
CL
Operating power supply level
Positive analog supply
Negative analog supply
Maximal differential input voltage
Maximal case temperature
Max. operating ambient temperature
Thermal resistance, case– ambient (component)
Thermal resistance, case – rip (module)
Maximal duration of @ 20kHz, 25VRMS output
Maximal pure capacitive loading
VALUE
UNIT
55
10 to 15
-10 to –15
±15
100
60
5
2
30
470
V
V
V
V
O
C
O
C
K/W
K/W
s
nF
RC- Zobel is designed for worst-case music loads. Long lasting continuous stress at high frequencies above 10kHz may damage the device.
Electrical Specifications
Unless otherwise specified, f=1kHz, Po=1W. ta = 25 OC.
SYMBOL
Vp
Vcc
Vss
PO
THD+N
THD+N
IVp
IVcc
IVss
fo
fs
n
PSRR
VNo
VOFF
Av
F
fu
fl
Zo
ZL
D
IMD1
IMD2
TIM
PARAMETER
Power Supply
Positive analog supply
Negative analog supply
Output power @
0.05%THD+N
10Hz < f < 20kHz
(22kHz BW measurement)
THD + N in 4Ω
Maximal THD + N in 4Ω
(22kHz BW measurement)
Quiescent current
Quiescent current
Quiescent current
Offset switching frequency
Switching frequency range
Power stage Efficiency
Power Supply Rejection
Output referenced idle noise
Output referenced offset
(DC calibration active)
Nominal Voltage Gain
Frequency response
Upper bandwidth limit
(-3dB)
Lower bandwidth limit
(-3dB)
Abs. output impedance
Load impedance range
Dynamic range
Intermodulation (CCIF)
Intermodulation (SMPTE)
Transient intermodulation
(TIM)
Bang & Olufsen PowerHouse a/s
CONDITIONS
Operation
Operation
Operation
RL=2.7Ω. Vp=50V
RL=4Ω. Vp=50V
RL=8Ω. Vp=50V
f = 1kHz, PO=1W
10Hz < f < 20kHz
100mW < Po < 200W
Vp=48V
Vcc=12V
Vss=-12V
Offset carrier at idle
Idle to full scale variation
RL =8, PO=100W
MIN
29
10
-10
MAX
50
15
-15
UNIT
V
V
V
W
0.006
0.03
0.01
0.06
%
%
30
100
20
380
40
70
100
mA
mA
mA
kHz
kHz
%
dB
µV
±5
±50
mV
20Hz-20kHz, All loads
27.0
±0.2
27.2
±0.4
dB
dB
RL =8
80
kHz
RL =8
4
Hz
A-weighted
10Hz < f < 20kHz
Terminated input
20
TYP
48
12
-12
250
200
110
360
100
60
50
26.8
f = 1kHz
2
A-weighted
f=19kHz,20kHz, Po=10W
f=60Hz,7kHz(1:4), Po=10W
f1=3.15kHz square,
f2=15kHz, Po=10W
400
400
93
5
4
114
0.001
0.008
0.003
10
º
0.002
0.02
0.005
mΩ
Ω
dB
%
%
%
Page 3 of 15
ICEpower
ICE250A
250W Power Amplifier
Timing Specifications
SYMBOL
tsd
PARAMETER
Switching start up delay
Output delay
tpdm
tmd
Mute delay
tdmd
De-mute delay
tpsd
Shutdown delay
1)
For details see Figure 4 and Figure 5.
CONDITIONS
Time from all power supply1)
are good
Time delay to signal 1)
Time delay to mute1)
Time to demute1)
Supply fail or Standby pin1)
MIN
200
TYP
250
MAX
300
UNIT
ms
350
30
300
400
50
350
1
500
100
400
5
ms
ms
ms
µs
Typical Performance Characteristics
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Frequency response in 2.7Ω, 4Ω, 8Ω and open load. Top – amplitude. Bottom – Phase.
Bang & Olufsen PowerHouse a/s
Page 4 of 15
ICEpower
ICE250A
250W Power Amplifier
Efficiency vs. Output Power
100
90
80
70
60
% 50
40
30
20
10
0
0
20
40
60
80
100
Watts
Efficiency vs. output power (8Ω)
100
90
80
70
60
% 50
40
30
20
10
0
0
50
100
Watts
150
200
Efficiency vs. output power (4Ω)
100
90
80
70
60
% 50
40
30
20
10
0
0
50
100
150
200
250
Watts
Efficiency vs. output power (2.7Ω)
Bang & Olufsen PowerHouse a/s
Page 5 of 15
ICEpower
ICE250A
250W Power Amplifier
Harmonic Distortion and Noise
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THD + N vs. output power at 100Hz, 1kHz and 7kHz * (8Ω)
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THD + N vs. output power at 100Hz, 1kHz and 7kHz * (4Ω)
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THD + N vs. output power at 100Hz, 1kHz and 7kHz * (2.7Ω)
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FFT Analysis.at2
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Idle noise (16K FFT). Residual = 70µV(A)
Title:
FFT Analysis.at2
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f= 5kHz. Po = 100mW. 4Ω loading. THD = 0.0005%
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f= 5kHz. Po = 1W. 4Ω loading. THD = 0.002%
*
22kHz Audio Precision measurement-filter is used. 7kHz corresponds to the worst-case situation where 2. and 3.
harmonic are within the audio band.
Bang & Olufsen PowerHouse a/s
Page 6 of 15
ICEpower
ICE250A
250W Power Amplifier
Intermodulation Distortion (CCIF, SMPTE and TIM)
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CCIF IMD vs. Po. RL = 4Ω. f1 =19kHz, f2=20kHz
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SMPTE 4:1 IMD vs. Po. R L = 4Ω. f1 = 7kHz, f2 = 60Hz
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FFT SMPTE-DIN.at2
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TIM vs. output power. RL = 4Ω.
Bang & Olufsen PowerHouse a/s
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CCIF IMD analysis. RL = 4Ω. Po=100mW. IMD = 0.001%
Title:
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SMPTE 4:1 FFT analysis .Po = 1W. IMD = 0.001%
Title:
FFT Analysis.at2
Creator:
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TIM FFT analysis at Po=1W / RL = 4Ω.
Page 7 of 15
ICEpower
ICE250A
250W Power Amplifier
Application Information
-12V
Power Supply
+12V
48V DC
10000uF/63V
Vp
Vcc
Vss
22uF
300uF
22uF
Vo+
Vi+
Preamp,
Filter etc.
Av = 27dB
Vi-
Vo-
Control
Stby / Reset control
(Optional)
AGND
PGND
Figure 1: Typical application
ICE250A is designed as a “complete” component electronically and mechanically to simplify product
development. A typical ICE250A component application is in a single channel application (e.g. an active
speaker system). An example is shown on Figure 1.
Input / output interface
C2
3k9
3k3
1k
-
Vi+
3k3
1k
+
ViC1
C1
C2
To Soft clipping/
Mute Control
3k9
AGND
AGND
Figure 2: Balanced input buffer / anti-aliasing filter
Bang & Olufsen PowerHouse a/s
Page 8 of 15
ICEpower
ICE250A
250W Power Amplifier
The balanced input section provides signal buffering and anti-alias filtering. The balanced configuration
helps to avoid humm and noise pick-up. Unbalanced input can be set up applying a short between Viand analog ground.
The anti-alias filter bandwidth is 100kHz and the filter characteristic is shaped to match the power
amplification section to provide and overall 80kHz power amplifier bandwidth. The input impedance of
the input section is approximately 8k Ω over the audio bandwidth. This should be an acceptable loading
condition for pre-amps, active crossover outputs etc.
Output Stage
The output stage is a bridge topology with a 2nd order filter. This leads to a balanced power output on the
terminals Vo+ and Vo-. The filter design is part of the proprietary MECC topology and chosen as a
compromise between demodulation, efficiency and filter volume.
ICE250A
Vo+
L
CZ
Power
Stage
C
RZ
L
Vo-
Output filter
Figure 3: Output filter section with compensating Zobel network
The essential output characteristics are:
• Output impedance is below 25mΩ @20kHz
• The output residual basically consists of single frequency component at the carrier fundamental of
approximately 400kHz. In a standard application set-up the output characteristics lead to compliance
with the EN and FCC directives.
• System bandwidth is 80khz in 8Ω.
ICE250A is designed to be intolerant to loading characteristics with low output impedance at all
frequencies (see frequency response under performance characteristics). The low output impedance/high
damping factor means that the device can drive many types of loads. This goes for a wide span of
resistive/inductive loads as typical speakers. Even heavily inductive subwoofer loads are well driven by the
device without any additional compensation needed. However, care should be taken in pure capacitive
loads. The ICE250A is designed to be stable for capacitive loads up to 470nF. Higher capacitive loads may
compromise stability and thus damage the device.
Notice! The balanced Speaker outputs are both “hot” with a common-mode DC level equal to Vp/2.
Shorting one of the terminals to ground results in an over current situation. Also, balanced probes should
be used for monitoring and measurements.
Bang & Olufsen PowerHouse a/s
Page 9 of 15
ICEpower
ICE250A
250W Power Amplifier
Operational timing diagram
The ICE250A is controlled by the power supply input pins, the Standby pin and the Mute pin. If the
supplies are not at their minimum values the amplifier will go into standby mode. The amplifier can be
forced to standby mode by pulling the standby pin low. The Mute pin will not stop the switching of the
amplifier, but attenuates the output signal with 60dB.
Mute
Signal Out
tmd
tdmd
Figure 4 Mute and demute timing definitions
All power supplies good
or
STANDBY
Switching
Signal Out
tsd
tpdm
tpsd
Figure 5 Supply startup and shut down timing definitions
Power-up sequence
The power supplies control power-up of the ICE250. When the power supplies exceed the powergood
levels, the switching output stage is enabled with a 50% duty-cycle (zero modulation). In order to secure
power supply stability before startup, a propagation-delay of typically tsd = 200ms have been introduced.
Following, the build-in mute function releases the input signal softly with a timed delay of tmute = 300ms
resulting in a controlled soft startup sequence. Thus the total propagation-delay from power is applied to
full signal amplification is 500ms.
Power down sequence
The module will shut-down into standby mode if:
1. One of the power supplies drops to an unacceptable levels or falls out completely.
2. The standby pin is pulled low.
In all events, ICE250A will shut off instantly (1µs) by muting the signal and disabling the switching power
stage. Following a power down in event (1) and (2), ICE250A will follow the standard power-up
sequence.
Mute control
The mute function has been implemented to allow soft mute/demute of the module. The recommended
external interface circuit for this pin can be seen on Figure 6.
Bang & Olufsen PowerHouse a/s
Page 10 of 15
ICEpower
ICE250A
250W Power Amplifier
Vcc
1M
MUTE
100k
C
BC546B
R
Control signal
Figure 6 Interface and simplified internal circuit for the MUTE pin
Timing specifications is only valid with the shown interface.
Standby control
The Standby pin can be used to put the module in a low power consumption mode. The standby mode is
obtained by pulling the standby pin low. This function allows quick shutdown of the module and can be
used for protection of the module.
The recommended external circuit is shown on Figure 7. The timings given in the specifications are only
valid with the interface circuit shown on Figure 7
Vcc
10k
STANDBY
BC546B
R
Control signal
Figure 7 Interface and simplified internal circuit for STANDBY pin.
Monitor output
The monitor output has been implemented as a ground referenced version of the balanced output signal.
The internal output circuit of this output is shown on Figure 8.
Bang & Olufsen PowerHouse a/s
Page 11 of 15
ICEpower
ICE250A
250W Power Amplifier
Vo+
Vo-
Internal Feedback
47k
-28.3dB
150p
+
47k
Monitor
Figure 8 Internal circuitry of the monitor output.
The bandwidth for the monitor output is limited to 45kHz.
Bang & Olufsen PowerHouse a/s
Page 12 of 15
ICEpower
ICE250A
250W Power Amplifier
Thermal design
Thermal design is generally a huge concern in power amplifier systems. Inefficient linear designs are
generally equipped with extensive heat sinks to keep the transistor junction temperature down. ICE250A
is based on very efficient ICEpower Analog technology providing high overall efficiency characteristics at
all levels of operation. See efficiency vs. output power under typical performance characteristics.
Part of the “component” philosophy of the A–series is to provide a self-cooled component thus
eliminating the need for special attention to thermal design. The thermal resistance of the full component
is 3K/W allowing a maximal loss of P loss ≈20W continuos in the worst case situation with an ambient
temperature of 40 deg. This corresponds to a continuos average output loading of the device of 80100W, which is very unlikely to occur in any practical application with music loading. It should be noticed
that this is only valid for a open environment. This applies only for in ventilated environments.
For extreme loading requirements with continuos average loading above 60W typical or in closed
environments and ambient temperatures above 40°C we recommend the module edition for heatsink
mounting. With 2K/W Rthj,rib the heat-sink can be designed using normal thermal design considerations.
See more detailed application information on thermal design in the developer kit “Product development
with ICEpower”.
Layout / Power Supply
ICE250A has excellent power supply rejection relating to the use of COM modulation and as such the are
no specific requirements for power supply stabilisation. ICE250A runs on SMPS supplies and linear nonstabilised supplies with several volts of ripple. Also, power supply bypassing and layout is not critical, and
will not cause stability problems as know with linear designs.
For more information regarding power supply design see the “Product Development with ICEpower”
documentation.
Bang & Olufsen PowerHouse a/s
Page 13 of 15
ICEpower
ICE250A
250W Power Amplifier
Physical Dimensions
A
B
C
D
E
F
G
Bang & Olufsen PowerHouse a/s
TBA
TBA
27.5+/0.9
4+/0.2
80+/0.2
73.4+/0.1
M3 (4 pcs.)
Page 14 of 15
ICEpower
ICE250A
250W Power Amplifier
Notes
For more information about ICEpower® technology from Bang & Olufsen PowerHouse a/s, visit our website or contact us.
Bang & Olufsen PowerHouse a/s
Peter Bangs Vej 15
DK-7600 Struer.
Denmark
Sales information: icesales@bang-olufsen.dk
Technical and application information: icesupport@bang-olufsen.dk
Web-site:
www.bangolufsen-powerhouse.com
or
www.bang-olufsen.com (PowerHouse section)
Notice !
The data sheet contains specifications that may be subject to change without prior notice. ICEpower® is a
trademark of Bang&Olufsen PowerHouse a/s.
Bang&Olufsen PowerHouse a/s products are not autorized for use as critical components in lifte support
devices or systems without the express written approval of the president and general counsel of
Bang&Olufsen PowerHouse a/s. As used herein:
1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and whose failure to perform when properly used in
accordance with instructions for use provided in the labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life support device or system whose failure to perform
can be reasonably expected to cause the failure of the life support device or system, or to affect its safety
or effectiveness.
Bang & Olufsen PowerHouse a/s
Page 15 of 15