TOP252-262
Pin Functional Description
VOLTAGE MONITOR (V) Pin (Y & M package only):
Input for OV, UV, line feed forward with DCMAX reduction, output
overvoltage protection (OVP), remote ON/OFF and device reset.
A connection to the SOURCE pin disables all functions on this pin.
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.
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 DCMAX
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.
VUV = IUV × RLS + VV (IV = IUV
VOV = IOV × RLS + VV (IV = IOV
)
)
+
For RLS = 4 M7
4 M7
RLS
VUV = 102.8 VDC
VOV = 451 VDC
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.
DCMAX@100 VDC = 76%
DCMAX@375 VDC = 41%
DC
Input
Voltage
D
S
V
CONTROL
C
For RIL = 12 k7
ILIMIT = 61%
X
E Package (eSIP-7C)
Y Package (TO-220-7C)
Note: Y package for TOP259-261
See Figure 55b for
other resistor values
(RIL) to select different
ILIMIT values.
RIL
12 k7
-
Exposed Pad
(Hidden)
Internally
Connected to
SOURCE Pin
Figure 5. TOP254-258 Y and All M/E/L Package Line Sense and Externally Set
Current Limit.
VUV = IUV × RLS + VV (IV = IUV
VOV = IOV × RLS + VV (IV = IOV
)
)
Tab Internally
Connected to
SOURCE Pin
+
1 2 3 4 5
V X C F S
7
D
For RLS = 4 M7
4 M7
RLS
L Package (eSIP-7F)
VUV = 102.8 VDC
VOV = 451 VDC
DCMAX@100 VDC = 76%
DCMAX@375 VDC = 41%
DC
Input
Voltage
D
S
V
1 2 3 4 5
V X C SG
7
D
CONTROL
C
Lead Bend
For RIL = 12 k7
ILIMIT = 61%
Outward from Drawing
(Refer to eSIP-7F Package
Outline Drawing)
X
G
1 2 3 4 5
V X C F S
7
D
See Figure 55b for
other resistor values
(RIL) to select different
ILIMIT values.
RIL
12 k7
M Package
-
Y Package (TO-220-7C)
Note: Y package for TOP254-258
V
S
10
9
1
2
3
Figure 6. TOP259-261 Y Package Line Sense and External Current Limit.
S
S
S
X
C
8
7
+
VUV = IUV × RLS + VM (IM = IUV
VOV = IOV × RLS + VM (IM = IOV
)
)
5
6
D
S
Tab Internally
Connected to
SOURCE Pin
For RLS = 4 M7
VUV = 102.8 VDC
VOV = 451 VDC
P and G Package
RLS
4 M7
M
C
S
S
1
2
8
7
DC
Input
Voltage
DCMAX@100 VDC = 76%
DCMAX@375 VDC = 41%
D
S
M
6
5
S
S
1 2 3 4 5
V X C S F
7
CONTROL
C
D
4
D
PI-4644-091108
-
PI-4712-120307
Figure 4. Pin Configuration (Top View).
Figure 7. P/G Package Line Sense.
6
Rev. F 01/09
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