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ICE2A0565 Datasheet(PDF) 11 Page - Infineon Technologies AG

Part No. ICE2A0565
Description  Off-Line SMPS Current Mode Controller with integrated 650V/800V CoolMOS
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Manufacturer  INFINEON [Infineon Technologies AG]
Direct Link  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

ICE2A0565 Datasheet(HTML) 11 Page - Infineon Technologies AG

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Version 2.6
11
25 Dec 2006
CoolSET™-F2
Functional Description
secondary output voltage is insensitive on line
variations. Line variation changes the current
waveform slope which controls the duty cycle.
The external RSense allows an individual adjustment of
the maximum source current of the integrated
CoolMOS™.
Figure 9
Improved Current Mode
To improve the Current Mode during light load
conditions the amplified current ramp of the PWM-OP
is superimposed on a voltage ramp, which is built by
the switch T2, the voltage source V1 and the 1st order
low pass filter composed of R1 and C1(see Figure 9,
Figure 10). Every time the oscillator shuts down for
max. duty cycle limitation the switch T2 is closed by
VOSC. When the oscillator triggers the Gate Driver T2 is
opened so that the voltage ramp can start.
In case of light load the amplified current ramp is to
small to ensure a stable regulation. In that case the
Voltage Ramp is a well defined signal for the
comparison with the FB-signal. The duty cycle is then
controlled by the slope of the Voltage Ramp.
By means of the Comparator C5, the Gate Driver is
switched-off until the voltage ramp exceeds 0.3V. It
allows the duty cycle to be reduced continuously till 0%
by decreasing VFB below that threshold.
Figure 10 Light Load Conditions
3.2.1
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 Isense. RSense converts the
source current into a sense voltage. The sense voltage
is amplified with a gain of 3.65 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, C5 and the Soft-Start-Comparator.
3.2.2
PWM-Comparator
The PWM-Comparator compares the sensed current
signal of the integrated CoolMOSTM with the feedback
signal VFB (see Figure 11). 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.
x3.65
PWM OP
0.8V
10k
Oscillator
PWM Comparator
20pF
T
2
R
1
C
1
FB
PWM-Latch
V
1
C5
0.3V
Gate Driver
Voltage Ramp
V
OSC
Soft-Start Comparator
t
t
V
OSC
0.8V
FB
t
max.
Duty Cycle
0.3V
Gate Driver
Voltage Ramp


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