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| 型号： | NCP1380DGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 24/26页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL NCP1380 CURR CTLR |
| 设计资源： | NCP1380DGEVB Schematic NCP1380DGEVB Test Procedure NCP1380DGEVB Gerber Zip NCP1380DGEVB Bill of Materials |
| 标准包装： | 1 |
| 主要目的： | AC/DC，主面 |
| 输出及类型： | 1，隔离 |
| 输出电压： | 19V |
| 电流 - 输出： | 4A |
| 输入电压： | 85 ~ 265VAC |
| 稳压器拓扑结构： | 回扫 |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCP1380 |
| 其它名称： | NCP1380DGEVB-ND NCP1380DGEVBOS |
NCP1380
OVERVOLTAGE PROTECTION/BROWN?OUT (C AND D VERSIONS)
The C and D versions of NCP1380 combine brown?out
and overvoltage detection on pin 7.
HV?Bulk
VCC
noi s e de l a y
+
S
DRV
Rbou
Dz
VOVP
?
S
Q
La tc h
Q
Q
OVP/BO
Q
7
VDD
IBO
gr a nd
R
R
Rbol
noi s e de l a y
reset
Rc l a mp
CS c omp
BO reset
Vclamp
VBO
Figure 43. Brown?out and Overvoltage Protection
In order to protect the power supply against low input
voltage condition, the pin 7 permanently monitors a fraction
of the bulk voltage through a voltage divider. When this
image of bulk voltage is below the V BO threshold, the
controller stops switching. When the bulk voltage comes
when V CC reaches V CC(on) (Figure 44): this ensures a clean
startup sequence with soft?start. The hysteresis for the
brown?out function is implemented with a high side current
source sinking 10 m A when the brown?out comparator is
high (V bulk < V bulk(on) )
back within safe limits, the circuit will restart pulsing only
Figure 44. Brown?out Operating Chronograms
In order to avoid having a too high voltage on pin 7 if the
bulk voltage is high, an internal clamp limits the voltage.
In case of overvoltage, the zener diode will start to
conduct and inject current inside the internal clamp resistor
R clamp thus causing pin 7 voltage to increase. When this
voltage reaches V OVP , the controller latches?off and stays
latched until the user cycles down the power supply
(Figure 45).
http://onsemi.com
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