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2AS01 Datasheet(PDF) 13 Page - Infineon Technologies AG

Part # 2AS01
Description  Off-Line SMPS Current Mode Controller
PDF  24 Pages
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Manufacturer  INFINEON [Infineon Technologies AG]
Direct Link  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

2AS01 Datasheet(HTML) 13 Page - Infineon Technologies AG

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Datasheet
13
30 Jun 2006
Preliminary Data
ICE2AS01/S01G
ICE2BS01/S01G
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 VFB 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 VCCon = 13.5V by
charging the Capacitor CVCC by means of the Start-Up
Resistor RStart-Up. Then the Error-Latch is reset by
Power Up Reset and the external Soft-Start capacitor
CSoft-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
Soft-Start
6.5V
C
Soft-Start
C4
5.3V
C3
4.8V
G2
T1
Error-Latch
Power Up Reset
R
FB
6.5V
FB
SoftS
Open loop & no load condition
t
Driver
13.5V
16.5V
FB
4.8V
5µs Blanking
Failure
Detection
5.3V
SoftS
4.0V
Overvoltage
Detection Phase
Soft-Start Phase
t
t
T
Restart
T
Burst2
VCC
8.5V
Overvoltage Detection
t



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