TOP232G データシートの表示（PDF） - Power Analog Micoelectronics

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TOP232G

Design Flexible, EcoSmart, Integrated Off-line Switcher

Power Analog Micoelectronics 

TOP232-234

CONTROL (C)

VC

ZC

SHUNT REGULATOR/

ERROR AMPLIFIER

5.8 V

IFB

VI (LIMIT)

CURRENT

LIMIT

ADJUST

ON/OFF

VBG + VT

MULTI-

FUNCTION (M)

FREQUENCY (F)

(Y Package Only)

RE

VBG

OV/UV

LINE

SENSE DCMAX

+

5.8 V

4.8 V

-

INTERNAL UV

COMPARATOR

SOFT START

0

INTERNAL

1

SUPPLY

STOP

DCMAX

SOFT-

START

DMAX

CLOCK

HALF

FREQUENCY

SAW

OSCILLATOR WITH JITTER

÷8

SHUTDOWN/

AUTO-RESTART

HYSTERETIC

THERMAL

SHUTDOWN

-

+

PWM

COMPARATOR

S

Q

R

Q

DRAIN (D)

CURRENT LIMIT

COMPARATOR

CONTROLLED

TURN-ON

GATE DRIVER

LEADING

EDGE

BLANKING

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 reduction,

MAX

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.

SOURCE (S)

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.

Tab Internally

Connected to SOURCE Pin

7D

5F

4S

3M

1C

Y Package (TO-220-7B)

M1

8S

S2

7S

S3

C4

5D

P Package (DIP-8B)

G Package (SMD-8B)

Figure 3. Pin Configuration.

PI-2501-031901

3 B

7/01

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