DPA422R 查看數據表（PDF） - Power Integrations, Inc

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DPA422R

Highly Integrated DC-DC Converter ICs for Power over Ethernet & Telecom Applications

Power Integrations, Inc 

DPA422-426

CONTROL (C)

EXTERNAL

CURRENT LIMIT (X)

LINE-SENSE (L)

FREQUENCY (F)

VC

ZC

SHUNT REGULATOR/

ERROR AMPLIFIER

5.8 V

IFB

VI (LIMIT)

CURRENT

LIMIT

SOFT

ADJUST START

ON/OFF

VBG + VT

+

5.8 V

4.8 V

-

INTERNAL UV

COMPARATOR

SOFT START

0

INTERNAL

1

SUPPLY

÷8

SHUTDOWN/

AUTO-RESTART

1V

VBG

OV/UV

LINE

SENSE DCMAX

STOP LOGIC

STOP SOFT-

START

DCMAX

DMAX

CLOCK

HYSTERETIC

THERMAL

SHUTDOWN

300/400 kHz SAW

OSCILLATOR

-

+

PWM

COMPARATOR

CYCLE

RE

SKIPPING

S

Q

R

DRAIN (D)

CURRENT LIMIT

COMPARATOR

CONTROLLED

TURN-ON

GATE DRIVER

LEADING

EDGE

BLANKING

SOURCE (S)

PI-2760-070501

Figure 2. Functional Block Diagram.

Pin Functional Description

DRAIN (D) Pin:

High-voltage power MOSFET drain output. The internal startup

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.

LINE-SENSE (L) Pin:

Input pin for overvoltage (OV), undervoltage (UV) lock out, line

feed-forward with the maximum duty cycle (DCMAX) reduction,

remote ON/OFF and synchronization. A connection to

SOURCE pin disables all functions on this pin.

EXTERNAL CURRENT LIMIT (X) Pin:

Input pin for external current limit adjustment and remote

ON/OFF. A connection to SOURCE pin disables all functions

on this pin.

FREQUENCY (F) Pin:

Input pin for selecting switching frequency: 400 kHz if

connected to SOURCE pin and 300 kHz if connected to

CONTROL pin.

SOURCE (S) Pin:

Output MOSFET source connection for the power return.

Primary side control circuit common and reference point.

Tab internally connected

to SOURCE pin

(See layout considerations)

R Package

(TO-263-7C)

P Package (DIP-8)

G Package (SMD-8)

1234 5 7

CLXS F D

C1

L2

X3

F4

Figure 2. Pin Configuration (Top View).

8S

7S

6D

5S

PI-4030-110507

www.powerint.com

3

Rev. T 12/12

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