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PJ3843

Description
1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8
CategoryPower/power management   
File Size845KB,14 Pages
ManufacturerETC
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PJ3843 Overview

1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8

T
PJ3842B / PJ3843B
High Performance Current Mode Controller
he PJ3842B and PJ3843B series are high performance
fixed frequency current mode controllers. This is
cycle-by-cycle
current
limiting,
programmable
output
deadtime, and a latch for single pulse metering.
This device is available in 8-pin dual-in-line plastic
packages as well as the 8-pin plastic surface mount (SOP-8).
The SOP-8 package has separate power and ground pins for
the totem pole output stage.
The PJ3842B has UVLO thresholds of 16V (on) and 10V
(off), ideally suited for off-line converters. The PJ3843B is
tailored
for
lowervoltage
applications
having
UVLO
thresholds of 8.5V (on) and 7.6V (off).
specifically designed for Off-Line and DC-to-DC converter
applications offering the designer a cost effective solution
with minimal external components.This integrated circuits
feature a trimmed oscillator for precise duty cycle control, a
temperature compensated reference, high gain error amplifier,
current sensing comparator,and a high current totem pole
output ideally suited for driving a power MOSFET.
Also included are protective features consisting of input
and reference undervoltage lockouts each with hysteresis,
FEATURES
DIP-8
SOP-8
Trimmed Oscillator Discharge Current for Precise Duty
Cycle Control
Current Mode Operation to 500KHz
Automatic Feed Forward Compensation
Latching PWM for Cycle-By-Cycle Current Limiting
Internally
Lockout
High Current Totem Pole Output
Undervoltage Lockout with Hystersis
Low Start-Up and Operating Current
Trimmed
Reference
with
Undervoltage
Pin:1. Compensation
Pin:2.
Voltage Feedback
Pin:3.
Current Sense
Pin:4.
R
T
/C
T
5
. Gnd
6. Output
7. Vcc
8. Vref
ORDERING INFORMATION
Device
PJ3842/3843BCD
PJ3842/3843BCS
SIMPLIFIED BLOCK DIAGRAM
Operating Temperature
(Ambient)
-20℃ TO +85℃
Package
DIP-8
SOP-8
The document contains information on a new product.Specifications and information herein are subject to change without notice.
1-14
2004/11.Rev B

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PJ3843 PJ3842B PJ3842 PJ3843B PJ3843BCS PJ3842BCS PJ3843BCD PJ3842BCD
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