参数资料
型号: NCP1288BD65R2G
厂商: ON Semiconductor
文件页数: 26/39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
I OPC
V HV
V FB(fold)
V FB(OPC)
V FB
Figure 52. Overpower Compensation Current Relation to Feedback Voltage and Input Voltage
A peak detector continuously senses the ac input, and its
output is periodically sampled and reset, in order to follow
closely the input voltage variations. The sample and reset
events are controlled by the brown-out comparator when the
HV pin is connected to the AC line input (as shown in Figure
53). In the case the HV pin is connected to the DC-link
capacitor, its voltage never crosses the brown-out threshold,
and the watchdog timer t WD is used to generate the sampling
and reset events (Figure 54). Note that depending on the
relative speeds at which the HV and VCC voltages appear at
start-up, the correct overpower compensation current may
be delayed by one cycle.
V HV
BO threshold
time
Peak
detector
Reset
Reset
Reset
Reset
t wd
Reset
time
I OPC
Sample
Sample
Sample
Sample
Reset
time
Figure 53. Overpower Compensation Current with the HV pin connected to an ac voltage
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