ncp1395 ON Semiconductor, ncp1395 Datasheet - Page 24

• Manufacturer Part Number: ncp1395
• Description: High Performance Resonant Mode Controller
• Manufacturer: ON Semiconductor

timer has triggered the end of output pulses. In that case, the
V
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
comparator stops the output pulses whenever it is activated,
CC
Figure 51 depicts an auto−recovery situation, where the
level was given by an auxiliary power supply, hence
VCC
VCC
VCC
VCC
Timer
Timer
A&B
A&B
SS
SS
FB
FB
ON
ON
(min)
(min)
0.6V
0.6V
Figure 51. At power on, output A is first activated and the frequency slowly
4V
4V
1V
1V
A
A
B
B
T
T
SS
SS
decreases via the soft−start capacitor.
Slopes are similar
Slopes are similar
Vcc from an auxiliary supply
Vcc from an auxiliary supply
http://onsemi.com
NCP1395A/B
(min)
Fault!
Fault!
24
that is to say, when V
time, the V
startup resistor and heads toward VCC
capacitor. When the voltage reaches VCC
sequence takes place, involving a soft−start. Figure 52
portrays this behavior.
CC
pin still receives its bias current from the
CC
falls below 10.3 V typical. At this
A
A
B
B
T
T
SS
SS
ON
ON
via the Vcc
, a standard