LND3842A 查看數據表（PDF） - Linear Dimensions Semiconductor

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LND3842A

Current Mode PWM Controller

Linear Dimensions Semiconductor 

DATA SHEET

LND3842A/43A/44A/45A

LND3842B/43B/44B/45B

Current Mode PWM Controller

GENERAL DESCRIPTION

The LND3842B/43B/44B/45B and LND3842A

/43A/44A/45A are fixed frequency current mode

PWM controllers. They are specially designed for

OFF-line and DC to DC converter applications with

a minimal of external components. Internally

implemented circuits include a trimmed oscillator for

precise duty cycle control, a temperature

compensated reference, high gain error amplifier,

current sensing comparator. Protection circuitry

includes undervoltage lockout and current limiting.

The LND3843B, A and LND3844B, A have UVLO

thresholds of 16V(on) and 10 V (off). The

corresponding thresholds for the LND3843B, A/

45B,A are 8.4 V (on) and 7.6(off). The LND3842B,

A and LND3843B, A can operate within 100% duty

cycle. The LND3844B, A and LND3845B, A can

operate within 50% duty cycle.

The LND384XB has Start-Up current of .45mA(typ).

The LND384XA has Start-Up current of .17mA(typ).

FEATURES

• Low start-up and operating Current

• High Current Totem Pole Output

• Undervoltage Lockout with Hysterisis

• Operating Frequency up to 500KHZ

PIN CONFIGURATION

COMP

1

VFB

2

I SENSE

3

RT / C T

4

8

VREF

7

VCC

6 OUT

5 GND

• Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com •

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