TOP252-262
电压监测(V)和外部流限(X)引脚的典型使用方法（继上）
VUV = IUV × RLS + VV (IV = IUV
)
VUV = IUV x RLS + VV (IV = IUV
)
+
+
VOV = IOV × RLS + VV (IV = IoV
)
VOV = IOV x RLS + VV (IV = IoV
)
For RLS = 4 M7
DCMAX@100 VDC = 76%
DCMAX@375 VDC = 41%
4 M7
RLS
4 M7
RLS
VUV = 102.8 VDC
VOV = 451 VDC
QR can be an optocoupler
output or can be replaced
by a manual switch.
DC
Input
Voltage
DC
Input
Voltage
DCMAX @ 100 VDC = 76%
DCMAX @ 375 VDC = 41%
D
S
V
D
S
V
CONTROL
CONTROL
C
C
For RIL =12 k7
For RIL = 12 k7
ILIMIT = 61%
ILIMIT = 61%
TOP259-261YN would
use the G pin as the
return for QR.
TOP259-261YN would
use the G pin as the
return for RIL.
X
X
See Figure 55b for
other resistor values
(RIL) to select different
ILIMIT values.
RIL
QR
RIL
12 k7
ON/OFF
16 k7
-
-
PI-4725-011008
图 26. 用线电压检测和外部设定流限来启动远程开／关
图 27. 线电压检测和外部设定流限
+
VUV = IUV × RLS + VV (IV = IUV
)
VOV = IOV × RLS + VV (IV = IOV
)
For RLS = 4 M7
VUV = 102.8 VDC
VOV = 451 VDC
RLS
4 M7
DC
Input
Sense Output Voltage
Voltage
DCMAX @ 100 VDC = 76%
DCMAX @ 375 VDC = 41%
D
S
V
10 k7
CONTROL
Reset
C
QR
-
PI-4756-121007
图 28. 实现欠压、过压、线电压前馈及输出过压锁存保护的线电压检测，
带器件复位电路
多功能(M)引脚的典型使用方法
+
+
VUV = IUV × RLS + VM (IM = IUV
)
VOV = IOV × RLS + VM (IM = IOV
)
D
S
C
S
For RLS = 4 M7
VUV = 102.8 VDC
VOV = 451 VDC
M
S
RLS
4 M7
S
DC
Input
Voltage
DC
Input
Voltage
DCMAX @ 100 VDC = 76%
DCMAX @ 375 VDC = 41%
D
S
M
D
S
M
D
S
C
CONTROL
CONTROL
C
C
-
-
PI-4728-120307
PI-4727-061207
图 29. 三端工作（禁止多功能特性）
图 30. 实现欠压、过压和线电压前馈的线电压检测
18
版本D 08/08
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