参数资料
型号: NCP1288BD65R2G
厂商: ON Semiconductor
文件页数: 23/39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: 10.5 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: NCP1288BD65R2GOSDKR
NCP1288
CURRENT ? MODE CONTROL WITH OVERPOWER COMPENSATION AND SOFT ? START
Current Sensing
NCP1288 is a current ? mode controller, which means that
the FB voltage sets the peak current flowing in the
inductance and the MOSFET. This is done through a PWM
comparator: the current is sensed across a resistor and the
resulting voltage is applied to the CS pin. V CS is applied to
VDD
one input of the PWM comparator through the LEB block.
On the other input the FB voltage divided by K FB sets the
threshold: when V CS reaches this threshold, the output
driver is turned off.
The maximum value for the peak current, V ILIM , is set by
a dedicated comparator.
R FB(up)
K FB
+
?
PWM
Soft ? start
+
Jitter
?
Soft ? start ramp
Oscillator
FB
blanking
t SSTART
Start
Reset
IC Start
IC Stop
DCMAX
S
Q
R
DRV Stage
t LEB
+
CS
+
?
V ILIM
IC stop
blanking
UVLO
t BCS
+
?
+
Protection
Mode
HV stop
Latch
V CS(stop)
Fault
Figure 48. Current Sense Block Schematic
http://onsemi.com
23
TSD
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