AP3845S8 Anachip Corporation, AP3845S8 Datasheet

AP3845S8

Manufacturer Part Number

AP3845S8

Description

High Performance Current Mode PWM Controller

Manufacturer

Anachip Corporation

Datasheet

1.AP3845S8.pdf (8 pages)

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High Performance Current Mode PWM Controller

•

PDIP-8L, SOP-8L

This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of

this product. No rights under any patent accompany the sale of the product.

Optimized for Off-Line and DC to DC Converters

Low Start-Up Current (≦0.5mA)

Automatic Feed Forward Compensation

Pulse-by-Pulse Current Limiting

Enhanced Load Response Characteristics

Under-Voltage Lockout (UVLO) with Hysteresis

Double Pulse Suppression

High Current Totem Pole Output

Internally Trimmed Bandgap Reference

Current Mode Operation to 500KHZ

Low Ro Error Amplifier

Features

Pin Connections

Ordering Information

COMP.

SENSE

Top View

Part No.

2:3842

3:3843

4:3844

5:3845

GROUND

OUTPUT

REF

S8:SOP-8L

N8:PDIP-8L

Package

AP 384X X X X

Blank : Normal

L : Lead Free Package A : Taping

1/8

The AP3842/3/4/5 family of control ICs provides the

necessary features to implement off-line or DC to

DC fixed frequency current mode control schemes

with a minimal external parts count. Internally

implemented circuits include under voltage lockout

featuring start-up current less than 0.5 mA, a

precision reference trimmed for accuracy at the

error amp input, logic to insure latched operation, a

PWM comparator which also provides current limit

control, and a totem pole output stage designed to

source or sink high peak current. The output stage,

suitable for driving N-Channel MOSFETs, is low in

the off-state.

Differences between members of this family are the

under-voltage lockout thresholds and maximum

duty cycle ranges. The AP3842 and AP3844 have

UVLO thresholds of 16V(on) and 10V(off), ideally

suited for off-line applications. The corresponding

thresholds for the AP3843 and AP3845 are 8.5V

and 7.6V. The AP3842 and AP3843 can operate to

duty cycles approaching 100%. A range of the zero

to < 50% is obtained by the AP3844 and AP3845

by the addition of an internal toggle flip flop which

blanks the output off every other clock cycle.

Lead Free

General Description

Blank: Tube

Packing

AP3842/3/4/5

Rev.1.0 Oct.11, 2004

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