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参数资料
| 型号： | NCP1271P100G |
| 厂商： | ON Semiconductor |
| 文件页数： | 12/21页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM CM OVP OTP HV 7DIP |
| 标准包装： | 1,000 |
| 系列： | Soft-Skip™ |
| 输出隔离： | 隔离 |
| 频率范围： | 85kHz ~ 107kHz |
| 输入电压： | 10 V ~ 20 V |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm），7 引线 |
| 供应商设备封装： | 7-PDIP |
| 包装： | 管件 |
NCP1271
external components during a fault event. After the second
cycle, the controller tries to restart the application. If the
restart is not successful, then the process is repeated.
V out
During this mode, V CC never drops below the 4 V latch
reset level. Therefore, latched faults will not be cleared
unless the application is unplugged from the AC line (i.e.,
V bulk discharges).
Figure 25 shows a timing diagram of the V CC double
hiccup operation. Note that at each restart attempt, a soft
start is issued to minimize stress.
Supply voltage, V CC
12.6 V
9.1 V
12.6 V
9.1 V
0.6 V
12.6 V
9.1 V
V CC
t startup
time
Output waveforms with a large enough V CC capacitor
Desired level of V out
V CC
5.8 V
5.8 V
0.6 V
V out
time
time
Drain current, I D t startup
time
Switching is missing in
every two V CC hiccup cycles
featuring a “double ? hiccup”
Figure 25. V CC Double Hiccup Operation in a Fault
Condition
V CC Capacitor
As stated earlier, the NCP1271 enters a fault condition
when the feedback pin is open (i.e. FB is greater than 3 V)
for 130 ms or V CC drops below V CC(off) (9.1 V typical).
Therefore, to take advantage of these features, the V CC
capacitor needs to be sized so that operation can be
maintained in the absence of the auxiliary winding for at
least 130 ms.
The controller typically consumes 2.3 mA at a 65 kHz
frequency with a 1 nF switch gate capacitance. Therefore,
Output waveforms with too small of a V CC capacitor
Figure 26. Different Startup Scenarios of the
Circuits with Different V CC Capacitors
It is highly recommended that the V CC capacitor be as
close as possible to the V CC and ground pins of the product
to reduce switching noise. A small bypass capacitor on this
pin is also recommended. If the switching noise is large
enough, it could potentially cause V CC to go below V CC(off)
and force a restart of the controller.
It is also recommended to have a margin between the
winding bias voltage and V CC(off) so that all possible
transient swings of the auxiliary winding are allowed. In
standby mode, the V CC voltage swing can be higher due to
the low ? frequency skip ? cycle operation. The V CC
capacitor also affects this swing. Figure 27 illustrates the
possible swings.
Supply voltage, V CC
tstartup +
+ 130 ms
CVCC D V 85 m F · (12.6 V ? 9.1 V)
ICC1
+
to ensure at least 130 ms of operation, equation 1 can be
used to calculate that at least an 85 m F capacitor would be
necessary.
2.3 mA
(eq. 1)
If the 130 ms timer feature will not be used, then the
Feedback pin voltage, V FB
time
9.1 V
V skip
capacitance value needs to at least be large enough for the
output to charge up to a point where the auxiliary winding
can supply V CC . Figure 26 describes different startup
scenarios with different V CC capacitor values. If the V CC
cap is too small, the application fails to start because the
bias supply voltage cannot be established before V CC is
reduced to the V CC(off) level.
Drain current, I D
time
time
Figure 27. Timing Diagram of Standby Condition
http://onsemi.com
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