TOP252-262
电压监测(V)和外部流限(X)引脚的典型使用方法
TOP252-258M
TOP254-258Y
+
+
TOP259-261Y
D
S
C
S
X
S
V
S
S
V X C
S
F
D
DC
Input
Voltage
DC
Input
Voltage
V X C
S
G
D
D
S
C
D
S
V
D
S
V
C
S
D
CONTROL
CONTROL
C
C
C S
D
X
G
X
F
-
-
PI-4984-020708
PI-4716-020508
图 16b. TOP259-261 Y封装的三端工作方式（禁止电压监测和外部流限特性。）
图 16a. TOP254-258 Y封装的三端工作方式（禁止电压监测和外部流限特性。
频率引脚与源极或控制引脚相连。）
+
+
VUV = IUV × RLS + VV (IV = IUV
VOV = IOV × RLS + VV (IV = IOV
)
)
eSIP L Package eSIP E Package
For RLS = 4 M7
VUV = 102.8 VDC
VOV = 451 VDC
V X C
F
S
D
V X C
F
S
D
RLS 4 M7
DC
Input
Voltage
DC
Input
Voltage
DCMAX@100 VDC = 76%
DCMAX@375 VDC = 41%
C
S
D
C
S
D
D
S
V
D
S
V
CONTROL
CONTROL
C
C
X
F
-
-
PI-4717-120307
PI-4956-071708
图 17. 实现欠压、过压和线电压前馈的线电压检测
图 16c. 三端工作（禁止线电压检测和外部流限特性。对于TOP252-261 E封装，
频率引脚与源极或控制引脚相连。）
VUV = IUV × RLS + VV (IV = IUV
VOV = IOV × RLS + VV (IV = IOV
)
)
+
+
VUV = IUV × RLS + VV (IV = IUV
VOV = IOV × RLS + VV (IV = IOV
)
)
For RLS = 4 M7
VUV = 102.8 VDC
VOV = 451 VDC
For RLS = 4 M7
VUV = 102.8 VDC
VOV = 451 VDC
Sense Output Voltage
RLS
RLS
4 M7
4 M7
ROVP
DC
Input
Voltage
DC
Input
Voltage
VROVP
Sense Output Voltage
DCMAX @ 100 VDC = 76%
DCMAX @ 375 VDC = 41%
DCMAX @ 100 VDC = 76%
DCMAX @ 375 VDC = 41%
D
S
V
D
S
V
10 k7
CONTROL
CONTROL
Reset
C
C
QR
ROVP >3k7
-
-
PI-4756-121007
PI-4719-120307
图 18. 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
图 19. 实现欠压、过压、线电压前馈及输出过压迟滞保护的线电压检测
16
版本D 08/08
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