参数资料
型号: NCP1234BD65R2G
厂商: ON Semiconductor
文件页数: 17/33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: 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: 带卷 (TR)
NCP1234
Oscillator with Maximum Duty Cycle and Frequency
Jittering
The NCP1234 includes an oscillator that sets the
switching frequency with an accuracy of ? 7%. Two
frequency options can be ordered: 65 kHz and 100 kHz. The
maximum duty cycle of the DRV pin is 80%, with an
accuracy of ? 7%.
In order to improve the EMI signature, the switching
frequency jitters ? 6% around its nominal value, with a
triangle ? wave shape and at a frequency of 125 Hz. This
frequency jittering is active even when the frequency is
decreased to improve the EMI in light load condition.
Clamped Driver
The supply voltage for the NCP1234 can be as high as
28 V, but most of the MOSFETs that will be connected to the
DRV pin cannot accept more than 20 V on their gate. The
driver pin is therefore clamped safely below 16 V. This
driver has a typical current capability of ? 500 mA.
VCC
Clamp
f OSC
f OSC + 6
Nominal f OSC
f OSC ? 6
8%
(125 Hz)
Figure 30. Frequency Jittering
Time
http://onsemi.com
17
DRV signal
Figure 31. Clamped Driver
DRV
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