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參數(shù)資料
| 型號： | NCP1381 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Low−Standby High Performance PWM Controller |
| 文件頁數(shù)： | 24/26頁 |
| 文件大小： | 559K |
| 代理商： | NCP1381 |
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NCP1381
http://onsemi.com
24
A mix of conditions, BO, shortcircuit and UVLO fault are represented on this diagram. In BO, the pulses (pulse ok signal) are started at
V
CC
= 15 V and there is no latchoff phase. In shortcircuit, pulses are stopped by the timer and finally, in a UVLO conditions (not a
shortcircuit), there is a latchoff phase but the timer is flat since there is no shortcircuit.
Figure 37.
50.0m
150m
250m
350m
450m
V
CC
VCC
ON
VCC
OFF
VCC
latch
Timer
V
in
UVLO Interruption
ShortCircuit
Interruption
BO Interruption
B
OK
Comp.
Pulse
OK
PFC Behavior During BO Conditions
During brownout, the PFC is disabled; otherwise the
PFC controller consumption would prevent the charging of
the V
CC
capacitor. The PFC will be shutdown until BO
comes back and a clean startup sequence has properly ended.
Softstart
The NCP1381 features a softstart activated during the
power on sequence (P
ON
) and in shortcircuit conditions to
lower the acoustical noise in the transformer. As soon as
V
CC
reaches 15 V, the peak current is gradually increased
from nearly zero up to the maximum clamping level (e.g.
0.8 V / R
sense
). Every restart attempt is followed by a
softstart activation.
A shorter softstart is also activated during the skip cycle
condition to implement our softburst. This SoftSkip is
cancelled whenever a fault condition appears, in order not to
degrade the transient behavior in case of load transients
when the controller is initially in skip mode.
Figure 38. SoftStart is Activated During a Startup
Sequence or an OCP Condition
15 V
V
CC
Current
Sense
0 V (Fresh P
ON
)
or V
CClatch
5 ms
Max I
P
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| NCP1382DR2G | 功能描述:電流型 PWM 控制器 L-STNDBY PWM CNTRLR RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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