参数资料
型号: NCP1237BD65R2G
厂商: ON Semiconductor
文件页数: 27/41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
V HV
BO threshold
time
t wd
t wd
t wd
Peak
detector
Reset
time
I OPC
Sample
Sample
Sample
Reset
t wd
time
Figure 56. Overpower Compensation Current with the HV pin connected to a dc voltage
Feedback with Slope Compensation
The ratio from the FB voltage to the current sense setpoint
is typically 5. This means that the FB voltage corresponding
VDD
20 k W
to V ILIM is 3.5 V. There is a pullup resistor of 20 k W
(typical) from FB pin to the internal reference V FB(ref) .
FB
K FB
slope
comp.
Oscillator
+
?
PWM
CS
blanking
t LEB
Figure 57. FB Circuitry
In order to allow the NCP1237 to operate in CCM with a
duty cycle above 50%, a fixed slope compensation is
internally applied to the current ? mode control. The slope
appearing on the internal voltage setpoint for the PWM
comparator is ? 32.5 mV/ m s typical for the 65 kHz version
(and respectively ? 50 mV/ m s and ? 67 mV/ m s for the
100 kHz and 133 kHz versions).
http://onsemi.com
27
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