B3844A Просмотр технического описания (PDF) - Bay Linear

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B3844A

Current Mode PWM Controller

Bay Linear 

Bay Linear

Inspire the Linear Power

Current Mode PWM Controller

B3842/43/44/45A&A1

Description

The Bay Linear B3842/43/44/45 are fixed frequency current-

mode PWM controller. These devices are designed for Off-

Line and DC-to-DC converter applications with minimum

external components. The B3842 family Feature a trimmed

oscillator for precise duty cycle control, a temperature

compensated reference, high gain error amplifier, current

sensing comparator, and a high current totempole output.

Ideally suited for driving a power N-Channel MOSFET’s. It is

low when is on off stage. Protection circuitry includes built in

under-voltage lockout and current limiting.

Major differences between members of these series are the

UVLO thresholds and maximum duty-cycle ranges. Typical

UVLO thresholds of 16V (on) and 10V (off) on the B3842 and

B3844 devices make them ideally suited to off-line

applications. These corresponding typical thresholds for the

B3842 and B3845 devcies are 8.4V (on) and 7.6V (off). The

B3842 and B3843 devcies can operate to duty cycles

approaching 100%. A duty-Cycle range of 0 to 50% is

obtained by the B3844 and B3845 by the addition of an

internal toggle flip-flop, which blanks the output off every

other clock cycle. It id available in 8 pin DIP and SOIC

packages.

Features

• Low Start-Up and Operating Current

• Maximum Duty Cycle

• Operating Frequency Up to 500KHz

• Under voltage Lockout with Hysteresis

• Available in 8 pin SOIC

• Similar to industry Standard UC3842

Applications

• Switching Power Supply

• Monitor

Pin Connection

8-Pin Surface Mount

COMP

1

8

REF

NC

2

7

VCC

ISENSE

3

RT/CT

4

6

OUTPUT

5

GND

Top View

Ordering Information

Devices

B384X(Z)M

B384X(Z)P

Z=A ON Semi

Package

Temp.

SO-8

0 °C to 70 °C

8-DIP

0 °C to 70 °C

Z=A1 Fairchild & Samsung

Bay Linear, Inc 2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556

www.baylinear.com

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