参数资料
型号: NCP1252BDR2G
厂商: ON Semiconductor
文件页数: 12/18页
文件大小: 0K
描述: IC REG CTRLR FLYBK ISO PWM 8SOIC
标准包装: 2,500
PWM 型: 电流模式
输出数: 1
频率 - 最大: 500kHz
占空比: 84%
电源电压: 9 V ~ 28 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -25°C ~ 125°C
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
包装: 带卷 (TR)
NCP1252
V CC pin
V CC(on)
V CC pin
V CC(on)
BO pin
V BO
Time
BO pin
V BO
Time
SS pin
Time
SS pin
Soft start
Time
SS capacitor is
discharged
DRV pin
CASE #3
Time
Time
DRV pin
CASE #4
Time
Time
Figure 31. Controller Shuts Down with the Brown Out Pin
When the BO pin is grounded, the controller is shut down
and the SS pin is internally grounded in order to discharge
the soft start capacitor connected to this pin (Case #3). If the
BO pin is released, when its level reaches the V BO level a
new soft start sequence happens.
Soft Start:
As illustrated by the following figure, the rising voltage on
the SS pin voltage divided by 4 controls the peak current
sensed on the CS pin. Thus as soon as the CS pin voltage
becomes higher than the SS pin voltage divided by 4 the
driver latch is reset.
Clock
Rcomp
CS
LEB
S
Q
Q
DRV
Rse nse
Soft Start
Status
Vdd
R
Iss
Fixe d
Delay
120 ms
UVLO
+
?
SS
1/4
Soft start
Grand Reset
Figure 32. Soft Start Principle
http://onsemi.com
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