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TOP252-262
Typical Uses of VOLTAGE MONITOR (V) and EXTERNAL CURRENT LIMIT (X) Pins
+
DC
Input
Voltage
D
CONTROL
S
X
-
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.
+
DC
Input
Voltage
D
V
CONTROL
S
X
-
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.
+
R
DC
Input
Voltage
D
10 kΩ
Reset
Q
R
S
-
Figure 18. Line-Sensing for Undervoltage, Overvoltage, Line Feed-Forward and
Latched Output Overvoltage Protection.
16
Rev. J 08/16
TOP252-258M
TOP254-258Y
D
C
X
V
S
S
S
S
S
V X C S F
D
S C
V
C
C
F
PI-4716-020508
eSIP L Package
eSIP E Package
V X C
F
S
D
V X C
F
S
D
C
S D
C
S D
C
F
PI-4956-071708
V
= I
× R
+ V
(I
UV
UV
LS
V
V
V
= I
× R
+ V
(I
OV
OV
LS
V
V
For R
= 4 MΩ
LS
V
= 102.8 VDC
4 MΩ
UV
LS
V
= 451 VDC
OV
Sense Output Voltage
DC
@ 100 VDC = 76%
MAX
DC
@ 375 VDC = 41%
MAX
V
CONTROL
C
PI-4756-121007
+
D
DC
Input
Voltage
S D
-
Figure 16b. Three Terminal Operation (VOLTAGE MONITOR and EXTERNAL
CURRENT LIMIT Features Disabled for TOP259-261 Y Packages.
+
DC
Input
Voltage
-
Figure 17. Line-Sensing for Undervoltage, Overvoltage and Line Feed-Forward.
+
= I
)
UV
= I
)
OV
DC
Input
Voltage
-
Figure 19. Line-Sensing for Undervoltage, Overvoltage, Line Feed-Forward and
Hysteretic Output Overvoltage Protection.
TOP259-261Y
V X C S G
D
V
CONTROL
C
C S
S
X
G
V
= I
× R
UV
UV
V
= I
× R
OV
OV
For R
= 4 MΩ
LS
V
= 102.8 VDC
R
4 MΩ
UV
LS
V
= 451 VDC
OV
DC
@100 VDC = 76%
MAX
DC
@375 VDC = 41%
MAX
D
V
CONTROL
C
S
V
= I
× R
UV
UV
V
= I
× R
OV
OV
For R
= 4 MΩ
LS
V
= 102.8 VDC
UV
V
= 451 VDC
OV
Sense Output Voltage
R
4 MΩ
LS
R
OVP
VR
OVP
DC
@ 100 VDC = 76%
MAX
DC
@ 375 VDC = 41%
MAX
D
V
CONTROL
C
R
S
D
D
PI-4984-020708
+ V
(I
= I
)
LS
V
V
UV
+ V
(I
= I
)
LS
V
V
OV
PI-4717-120307
+ V
(I
= I
)
LS
V
V
UV
+ V
(I
= I
)
LS
V
V
OV
>3kΩ
OVP
PI-4719-120307
www.power.com
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