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TOP252-262
Pin Functional Description
DRAIN (D) Pin:
High-voltage power MOSFET DRAIN pin. The internal start-up
bias current is drawn from this pin through a switched high-
voltage current source. Internal current limit sense point for
drain current.
CONTROL (C) Pin:
Error amplifier and feedback current input pin for duty cycle
control. Internal shunt regulator connection to provide internal
bias current during normal operation. It is also used as the
connection point for the supply bypass and auto-restart/
compensation capacitor.
EXTERNAL CURRENT LIMIT (X) Pin (Y, M, E and L package):
Input pin for external current limit adjustment and remote
ON/OFF. A connection to SOURCE pin disables all functions on
this pin.
E Package (eSIP-7C)
Exposed Pad
(Hidden)
Internally
Connected to
SOURCE Pin
1
2
3
4
5
7
V
X
C
F
S
D
L Package (eSIP-7F)
Lead Bend
Outward from Drawing
(Refer to eSIP-7F Package
1
2
3
4
5
7
Outline Drawing)
V
X
C
F
S
D
M Package
V
S
1
10
2
9
S
X
S
C
3
8
S
7
5
6
D
S
P and G Package
M
S
1
8
C
2
7
S
6
S
4
5
S
D
Figure 4.
Pin Configuration (Top View).
6
Rev. J 08/16
Y Package (TO-220-7C)
Note: Y package for TOP259-261
Tab Internally
Connected to
SOURCE Pin
1
2
3
4
5
7
V
X
C
S
G
D
Y Package (TO-220-7C)
Note: Y package for TOP254-258
Tab Internally
Connected to
SOURCE Pin
1
2
3
4
5
7
V
X
C
S
F
D
PI-4644-091108
VOLTAGE MONITOR (V) Pin (Y & M package only):
Input for OV, UV, line feed forward with DC
overvoltage protection (OVP), remote ON/OFF and device reset.
A connection to the SOURCE pin disables all functions on this pin.
MULTI-FUNCTION (M) Pin (P & G packages only):
This pin combines the functions of the VOLTAGE MONITOR (V)
and EXTERNAL CURRENT LIMIT (X) pins of the Y package into
one pin. Input pin for OV, UV, line feed forward with DC
+
R
DC
D
Input
Voltage
S
-
Figure 5.
TOP254-258 Y and All M/E/L Package Line Sense and Externally Set
Current Limit.
+
R
DC
D
Input
Voltage
S
R
-
12 kΩ
Figure 6.
TOP259-261 Y Package Line Sense and External Current Limit.
+
R
DC
Input
Voltage
D
S
-
Figure 7.
P/G Package Line Sense.
reduction, output
MAX
MAX
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
4 MΩ
LS
V
= 102.8 VDC
UV
V
= 451 VDC
OV
DC
@100 VDC = 76%
MAX
V
C = 41%
DC
@375 VD
MAX
CONTROL
C
For R
= 12 kΩ
IL
I
= 61%
X
LIMIT
See Figure 55b for
R
IL
other resistor values
12 kΩ
(R
) to select different
IL
I
values.
LIMIT
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
4 MΩ
LS
V
= 102.8 VDC
UV
V
= 451 VDC
OV
DC
@100 VDC = 76%
MAX
V
C = 41%
DC
@375 VD
MAX
CONTROL
C
For R
= 12 kΩ
IL
I
= 61%
X
G
LIMIT
See Figure 55b for
other resistor values
IL
(R
) to select different
IL
I
values.
LIMIT
V
= I
× R
+ V
(I
UV
UV
LS
M
M
V
= I
× R
+ V
(I
OV
OV
LS
M
M
For R
= 4 MΩ
LS
4 MΩ
V
= 102.8 VDC
LS
UV
V
= 451 VDC
OV
DC
@100 VDC = 76%
MAX
DC
@375 VDC = 41%
MAX
M
CONTROL
C
PI-4712-120307
www.power.com
= I
)
UV
= I
)
OV
= I
)
UV
= I
)
OV
= I
)
UV
= I
)
OV
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