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ICE3A1065ELJ Datasheet(PDF) 10 Page - Infineon Technologies AG

Part # ICE3A1065ELJ
Description  Off-Line SMPS Current Mode Controller with integrated 650V CoolMOS
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Manufacturer  INFINEON [Infineon Technologies AG]
Direct Link  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

ICE3A1065ELJ Datasheet(HTML) 10 Page - Infineon Technologies AG

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CoolSET®-F3
ICE3A1065ELJ
Functional Description
Version 2.1
10
12 May 2009
Figure 6
Improved Current Mode
Figure 7
Light Load Conditions
3.3.1
PWM-OP
The input of the PWM-OP is applied over the internal
leading edge blanking to the external sense resistor
RSense connected to pin CS. RSense converts the source
current into a sense voltage. The sense voltage is
amplified with a gain of 3.2 by PWM OP. The output of
the PWM-OP is connected to the voltage source V1.
The voltage ramp with the superimposed amplified
current signal is fed into the positive inputs of the PWM-
Comparator C8 and the Soft-Start-Comparator (see
Figure 6).
3.3.2
PWM-Comparator
The PWM-Comparator compares the sensed current
signal of the integrated CoolMOS® with the feedback
signal VFB (see Figure 8). VFB is created by an external
optocoupler or external transistor in combination with
the internal pull-up resistor RFB and provides the load
information of the feedback circuitry. When the
amplified current signal of the integrated CoolMOS®
exceeds the signal VFB the PWM-Comparator switches
off the Gate Driver.
Figure 8
PWM Controlling
PWM OP
0.6V
10k
Ω
Oscillator
C8
T2
R1
C1
FB
PWM-Latch
V1
Gate Driver
Voltage Ramp
VOSC
Soft-Start Comparator
time delay
circuit (156ns)
X3.2
PWM Comparator
t
t
VOSC
0.6V
FB
t
max.
Duty Cycle
Gate Driver
Voltage Ramp
156ns time delay
X3.2
PWM OP
Improved
Current Mode
PWM Comparator
CS
Soft-Start Comparator
5V
C8
0.6V
FB
Optocoupler
RFB
PWM-Latch


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