参数资料
型号: NCP1237BD65R2G
厂商: ON Semiconductor
文件页数: 28/41页
文件大小: 0K
描述: IC REG CTRLR FLYBACK PWM 7SOIC
标准包装: 1
PWM 型: 电流模式
输出数: 1
频率 - 最大: 70kHz
占空比: 85%
电源电压: 9.5 V ~ 28 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 8-SOIC(0.154",3.90mm 宽)7 引线
包装: 标准包装
其它名称: NCP1237BD65R2GOSDKR
NCP1237
OVERCURRENT PROTECTION WITH FAULT TIMER
Classical Overcurrent Protection
When an overcurrent occurs on the output of the power
supply, the feedback loop asks for more power than the
controller can deliver, and the CS setpoint reaches V ILIM .
When this event occurs, an internal t fault timer is started:
once the timer times out, DRV pulses are stopped and the
controller is either latched off (latched protection,
Version A), or it enters an autorecovery mode (Version B).
The timer is reset when the CS setpoint goes back below
V ILIM before the timer elapses. The fault timer is also started
if the driver signal is reset by the max duty ratio.
FB
/5
+
?
PWM
R
Q
S
Fault Flag
timer
t fault
Protection
Mode
release
Reset DRV
Autorecovery
protection
CS
blanking
t LEB
+
+
?
V ILIM
Brown ? out
Reset
mode only
timer
t autorec
DC MAX
DRV
Figure 58. Timer ? Based Overcurrent Protection
In autorecovery mode, the controller tries to restart after
t autorec . If the fault has gone, the supply resumes operation;
if not, the system starts a new burst cycle (see Figure 59).
http://onsemi.com
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