参数资料
型号: NCP1238AD65R2G
厂商: ON Semiconductor
文件页数: 22/38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: NCP1238AD65R2GOSDKR
NCP1238
Oscillator with Maximum Duty Ratio and Frequency
Jittering
The NCP1238 includes an oscillator that sets the
switching frequency with an accuracy of $ 7%. The
maximum duty ratio of the DRV pin is 80% (typical), with
an accuracy of $ 7%.
f OSC
f OSC + A jitter
Nominal f OSC
f OSC - A jitter
In order to improve the EMI signature, the switching
frequency jitters around its nominal value, with a
triangle ? wave shape.
1 / F jitter
Figure 46. Frequency Jittering
Time
Clamped Driver
The supply voltage for the NCP1238 can be as high as
28 V, but most of the MOSFETs that will be connected to the
DRV pin cannot tolerate a gate ? to ? source voltage greater
than 20 V on their gate. The driver pin is therefore clamped
safely below 16 V.
VCC
Clamp
This driver has a typical current capability of ± 1.0 A.
DRV signal
DRV
Figure 47. Clamped Driver
http://onsemi.com
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