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ICE2AS01 Datasheet(PDF) 13 Page - Infineon Technologies AG

Part No. ICE2AS01
Description  PWM-FF IC
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Maker  INFINEON [Infineon Technologies AG]
Homepage  http://www.infineon.com
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 13 page
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Version 2.0
13
1 Feb 2002
ICE2AS01/G
ICE2BS01/G
Functional Description
Figure 20
FB-Detection
The detection is activated by C4 when the voltage at
pin SoftS exceeds 5.3V. Till this time the IC operates in
the Soft-Start Phase. After this phase the comparator
C3 can set the Error-Latch in case of open loop or
overload which leads the feedback voltage V
FB to
exceed the threshold of 4.8V. After latching VCC
decreases till 8.5V and inactivates the IC. At this time
the external Soft-Start capacitor is discharged by the
internal transistor T1 due to Power Down Reset. When
the IC is inactive VCC increases till V
CCon = 13.5V by
charging the Capacitor C
VCC by means of the Start-Up
Resistor R
Start-Up. Then the Error-Latch is reset by
Power Up Reset and the external Soft-Start capacitor
C
Soft-Start is charged by the internal pullup resistor RSoft-
Start . During the Soft-Start Phase which ends when the
voltage at pin SoftS exceeds 5.3V the detection of
overload and open loop by C3 and G2 is inactive. In this
way the Start Up Phase is not detected as an overload.
But the Soft-Start Phase must be finished within the
Start Up Phase to force the voltage at pin FB below the
failure detection threshold of 4.8V.
3.8.2
Overvoltage due to open loop with
no load
Figure 21
Auto Restart Mode
Figure 21 shows the Auto Restart Mode for open loop
and no load condition. In case of this failure mode the
converter output voltage increases and also VCC. An
additional protection by the comparators C1, C2 and
the AND-gate G1 is implemented to consider this
failure mode (see Figure 22).
R
S o ft-S ta rt
6.5 V
C
S o ft-S ta rt
C4
5.3V
C3
4.8 V
G2
T1
E rro r-L a tch
P o we r U p Re se t
R
FB
6.5V
FB
S o ftS
O pe n loop & no loa d c onditio n
t
Driv e r
13 .5V
16 .5V
FB
4.8 V
5Āµ s B lank ing
Fa ilu re
De te c tio n
5.3 V
S o ftS
4.0 V
O v e rvo ltage
D etec tio n P h as e
So ft-Sta rt Ph a s e
t
t
T
Re sta rt
T
Bu rs t2
VC C
8.5 V
O v erv olta ge D e tec tion
t




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