TOP233P datasheet(3/36 Pages) POWERINT

3 / 36 page

TOP232-234

7/01

Figure 2. Functional Block Diagram.

Pin Functional Description

DRAIN (D) Pin:

High voltage power MOSFET drain output. 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.

MULTI-FUNCTION (M) Pin:

Input pin for OV, UV, line feed forward with DC

MAX reduction,

external set current limit, remote ON/OFF and synchronization.

A connection to SOURCE pin disables all functions on this pin

and makes TOPSwitch-FX operate in simple three terminal

mode (like TOPSwitch-II).

FREQUENCY (F) Pin: (Y package only)

Input pin for selecting switching frequency: 132 kHz if connected

to SOURCE pin and 66 kHz if connected to CONTROL pin.

Figure 3. Pin Configuration.

PI-2535-083099

The switching frequency is internally set for 132 kHz only

operation in P and G packages.

SOURCE (S) Pin:

Output MOSFET source connection for high voltage power

return. Primary side control circuit common and reference point.

SHUTDOWN/

AUTO-RESTART

PWM

COMPARATOR

CLOCK

SAW

HALF

FREQUENCY

OSCILLATOR WITH JITTER

CONTROLLED

TURN-ON

GATE DRIVER

CURRENT LIMIT

COMPARATOR

INTERNAL UV

COMPARATOR

INTERNAL

SUPPLY

5.8 V

4.8 V

SOURCE (S)

DMAX

STOP

SOFT-

START

CONTROL (C)

MULTI-

FUNCTION (M)

FREQUENCY (F)

(Y Package Only)

5.8 V

IFB

LEADING

EDGE

BLANKING

÷ 8

HYSTERETIC

THERMAL

SHUTDOWN

SHUNT REGULATOR/

ERROR AMPLIFIER

DRAIN (D)

ON/OFF

DCMAX

VBG

DCMAX

VBG + VT

OV/UV

VI (LIMIT)

CURRENT

LIMIT

ADJUST

LINE

SENSE

SOFT START

PI-2501-031901

Tab Internally

Connected to SOURCE Pin

Y Package (TO-220-7B)

P Package (DIP-8B)

G Package (SMD-8B)

1 C

3 M

5 F

4 S

7 D

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