参数资料
型号: NCP1397ADR2G
厂商: ON Semiconductor
文件页数: 22/27页
文件大小: 0K
描述: IC REG CTRLR ISO PWM 16-SOIC
标准包装: 2,500
PWM 型: 控制器
输出数: 1
频率 - 最大: 560kHz
占空比: 52%
电源电压: 10.3 V ~ 20 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: 16-SOIC(0.154",3.90mm 宽)15 引线
包装: 带卷 (TR)
NCP1397A, NCP1397B
VDD
discharge at VCC(on)/
restart if VFB < 0.3 V
SS(dis)
Css
Itimer1
Ctimer
Ctimer
UVLO
Reset
Rtimer
Average
Input
Current
+
+ -
+
-
Vref(fault)
+
Fault
To Primary
Current Sensing
Circuitry
to latch
+
VtimerON
VtimerOFF
1 = ok
0 = fault
-
-
Vref(OCP)
+
VCC
+
Vref(skip)
+
FB
FB
1 = ok
0 = fault
Reset
DRIVING
LOGIC
SS
Skip/Disable
Skip
Figure 44. Fault Input Logic for NCP1397B
A
B
A
B
On Figures 43 and 44 examples, a voltage proportional to
primary current, once averaged, gives an image of the input
power in case V in is kept constant via a PFC circuit. If the
output loading increases above a certain level, the voltage on
this pin will pass the 1 V threshold and start the timer. If the
overload stays there, after a few tens of milli ? seconds,
switching pulses will disappear and a protective
auto ? recovery cycle will take place. Adjusting the resistor
R in parallel with the timer capacitor will give the flexibility
to adjust the fault burst mode (refer to Figure 45).
http://onsemi.com
22
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