參數(shù)資料
型號(hào)： ICE2B765P
英文描述： ?max. Pout=130W. fop=67kHz. Vbreak=650V. TO220?
中文描述： ？最大。噘\u003d 130瓦。紈褲子弟\u003d 67kHz。 Vbreak \u003d?650V。的TO220？
文件頁(yè)數(shù)： 13/25頁(yè)
文件大小： 642K
代理商： ICE2B765P
Datasheet
Preliminary Data
13
August 2001
Preliminary Specification
CoolSET
-F2
ICE2A765P
ICE2B765P
Functional Description
Figure 18
Auto Restart Mode
Figure 19
FB-Detection
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 20
Auto Restart Mode
Figure 20 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 21).The overvoltage detection
is provided by Comparator C1 only in the first time
during the Soft-Start Phase till the Soft-Start voltage
exceeds the threshold of the Comparator C2 at 4.0V
and the voltage at pin FB is above 4.8V. When VCC
exceeds 16.5V during the overvoltage detection phase
C1 can set the Error-Latch and the Burst Phase during
Auto Restart Mode is finished earlier. In that case
T
is shorter than T
. By means of C2 the
normal operation mode is prevented from overvoltage
Overload & Open loop/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
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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