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LND3843B

Description
Current Mode PWM Controller
File Size155KB,10 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LND3843B Overview

Current Mode PWM Controller

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
V
I
FB
1
2
3
4
8
7
6
5
V
V
REF
CC
SENSE
T
OUT
GND
R /C
T
Linear Dimensions, Inc.
445 East Ohio Street, Chicago IL 60611 USA
tel 312.321.1810
fax 312.321.1830
www.lineardimensions.com

LND3843B Related Products

LND3843B LND3842B LND3844B LND3845A LND3845B LND3844A
Description Current Mode PWM Controller Current Mode PWM Controller Current Mode PWM Controller Current Mode PWM Controller Current Mode PWM Controller current mode pwm controller
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