參數(shù)資料
型號： NCP1395B
廠商： ON SEMICONDUCTOR
英文描述： High Performance Resonant Mode Controller(高性能諧振模式控制器)
中文描述： 高性能諧振模式控制器（高性能諧振模式控制器）
文件頁數(shù)： 24/27頁
文件大小： 335K
代理商： NCP1395B
NCP1395A/B
http://onsemi.com
24
SS
T
SS
FB
A
B
A&B
Timer
Fault!
0.6V
Slopes are similar
A
B
4V
1V
Vcc from an auxiliary supply
T
SS
VCC
(min)
VCC
ON
Figure 51. At power on, output A is first activated and the frequency slowly
decreases via the softstart capacitor.
Figure 51 depicts an autorecovery situation, where the
timer has triggered the end of output pulses. In that case, the
V
CC
level was given by an auxiliary power supply, hence
its stability during the hiccup. A similar situation can arise
if the user selects a more traditional startup method,
with an auxiliary winding. In that case, the VCC
(min)
comparator stops the output pulses whenever it is activated,
that is to say, when V
CC
falls below 10.3 V typical. At this
time, the V
CC
pin still receives its bias current from the
startup resistor and heads toward VCC
ON
via the Vcc
capacitor. When the voltage reaches VCC
ON
, a standard
sequence takes place, involving a softstart. Figure 52
portrays this behavior.
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