参数资料
型号: NCP1234BD100R2G
厂商: ON Semiconductor
文件页数: 23/33页
文件大小: 0K
描述: IC REG CTRLR FLYBACK PWM 7SOIC
标准包装: 2,500
PWM 型: 电流模式
输出数: 1
频率 - 最大: 108kHz
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: 带卷 (TR)
NCP1234
Overcurrent protection with Fault timer
When an overcurrent occurs on the output of the power
supply, the FB loop asks for more power than the controller
can deliver, and the CS setpoint reaches V ILIMIT . 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.
To provide maximum output power at the low input line
voltages the fault timer is not started if the driver signal is
reset by the max duty cycle.
FB
/5
+
?
PWM
R
Q
S
timer
t fault
Protection
Mode
release
Reset DRV
Autorecovery
protection
CS
blanking
t LEB
+
+
?
V ILIM
Reset
mode only
timer
t autorec
Figure 40. Timer ? Based Overcurrent Protection
http://onsemi.com
23
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