TOP252-262
Typical Uses of VOLTAGE MONITOR (V) and EXTERNAL CURRENT LIMIT (X) Pins
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
Figure 16a. Three Terminal Operation (VOLTAGE MONITOR and EXTERNAL
CURRENT LIMIT Features Disabled. FREQUENCY Pin Tied to
SOURCE or CONTROL Pin) for TOP254-258 Y Packages.
Figure 16b. Three Terminal Operation (VOLTAGE MONITOR and EXTERNAL
CURRENT LIMIT Features Disabled for TOP259-261 Y Packages.
+
+
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
Figure 17. Line-Sensing for Undervoltage, Overvoltage and Line Feed-Forward.
Figure 16c. Three Terminal Operation (VOLTAGE MONITOR and EXTERNAL
CURRENT LIMIT Features Disabled. FREQUENCY Pin Tied to
SOURCE or CONTROL Pin) for TOP252-262 L and E Packages.
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
Figure 18. Line-Sensing for Undervoltage, Overvoltage, Line Feed-Forward and
Latched Output Overvoltage Protection.
Figure 19. Line-Sensing for Undervoltage, Overvoltage, Line Feed-Forward and
Hysteretic Output Overvoltage Protection.
16
Rev. F 01/09
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