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參數(shù)資料
| 型號： | ICE2B765P2 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | Off-Line SMPS Current Mode Controller with integrated 650V/ 800V CoolMOS |
| 中文描述： | 離線式開關(guān)電源電流模式控制器，集成了?650V / 800V的的CoolMOS |
| 文件頁數(shù)： | 15/35頁 |
| 文件大?。?/td> | 1716K |
| 代理商： | ICE2B765P2 |
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Version 2.0
15
11 Jun 2004
CoolSET-F2
Functional Description
Figure 20
Internal Gate Rising Slope
3.8
Protection Unit (Auto Restart Mode)
An overload, open loop and overvoltage detection is
integrated within the Protection Unit. These three
failure modes are latched by an Error-Latch. Additional
thermal shutdown is latched by the Error-Latch. In case
of those failure modes the Error-Latch is set after a
blanking time of 5μs and the CoolMOS is shut down.
That blanking prevents the Error-Latch from distortions
caused by spikes during operation mode.
3.8.1
Overload / Open Loop with Normal
Load
Figure 21 shows the Auto Restart Mode in case of
overload or open loop with normal load. The detection
of open loop or overload is provided by the Comparator
C3, C4 and the AND-gate G2 (see Figure 22). 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 V
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 pull-up resistor R
. 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.
Figure 21
Auto Restart Mode
Figure 22
FB-Detection
t
V
Gate
5V
ca. t = 130ns
Overload / Open Loop with Normal Load
FB
t
4.8V
5.3V
SoftS
5μs Blanking
Failure
Detection
Soft-Start Phase
VCC
13.5V
8.5V
t
Driver
t
T
Restart
T
Burst1
t
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
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