TOP264-271
CONTROL (C)
Z
C
V
C
0
DRAIN (D)
INTERNAL
SUPPLY
-
1
SHUNT REGULATOR/
ERROR AMPLIFIER
-
+
+
5.8 V
4.8 V
-
SOFT START
K
PS(UPPER)
+
5.8 V
VI
(LIMIT)
I
FB
CURRENT
LIMIT
ADJUST
INTERNAL UV
COMPARATOR
-
+
ON/OFF
÷
16
SHUTDOWN/
AUTO-RESTART
STOP LOGIC
K
PS(LOWER)
-
+
EXTERNAL CURRENT
LIMIT (X)
VOLTAGE
MONITOR (V)
V
BG
+ V
T
CURRENT LIMIT
COMPARATOR
SOURCE (S)
CONTROLLED
TURN-ON
GATE DRIVER
1V
V
LINE
SENSE
OVP OV/
UV
DC
MAX
DC
MAX
HYSTERETIC
THERMAL
SHUTDOWN
STOP
SOFT
START
D
MAX
CLOCK
S
R
Q
OSCILLATOR
WITH JITTER
66k/132k
F REDUCTION
FREQUENCY (F)
LEADING
EDGE
BLANKING
F REDUCTION
SOFT START
I
FB
PWM
I
PS(UPPER)
I
PS(LOWER)
OFF
K
PS(UPPER)
K
PS(LOWER)
PI-4511-012810
SOURCE (S)
Figure 2.
Functional Block Diagram (E and V Package).
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:
Input pin for external current limit adjustment remote
ON/OFF and device reset. A connection to SOURCE pin
disables all functions on this pin.
VOLTAGE MONITOR (V) Pin:
Input for OV, UV, line feed forward with DC
MAX
reduction, output
overvoltage protection (OVP), remote ON/OFF. A connection to
the SOURCE pin disables all functions on this pin.
FREQUENCY (F) Pin:
Input pin for selecting switching frequency 132 kHz if connected
to SOURCE pin and 66 kHz if connected to CONTROL pin.
SOURCE (S) Pin:
Output MOSFET source connection for high voltage power return.
Primary side control circuit common and reference point.
NO CONNECTION (NC) Pin:
Internally not connected, floating potential pin.
E Package (eSIP-7C)
V Package (eDIP-12)
S 12
Exposed Pad
S 11
(Hidden)
S 10
Internally
Connected to
S 9
SOURCE Pin
1V
2X
3C
4F
5 NC
6D
S8
S7
12345 7
VXCF S D
PI-5568-083109
Figure 3.
Pin Configuration (Top View).
3
www.powerint.com
Rev. B 03/10
POWERINT [ POWER INTEGRATIONS, INC. ]
