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PJ3844

Description
1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8
CategoryPower/power management   
File Size840KB,14 Pages
ManufacturerETC
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PJ3844 Overview

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

T
PJ3844B / PJ3845B
High Performance Current Mode Controller
he PJ3844B , PJ3845 series are high performance fixed
frequency current mode controllers. This is specifically
cycle-by-cycle current limiting , programmable output
deadtime, and a latch for single pulse metering. Allowing
output deadtimes to be programmed from 50% to 70%.
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 PJ3844B is tailored for lower voltage applications
having UVLO thresholds of 16V (on) 10V (off). ThePJ3845B
is tailored for lower voltage applications having UVLO
thresholds of 8.5V(on) and 7.6V(off).
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
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 Trimmed Reference with Undervoltage Lockout
High Current Totem Pole Output
Input Undervoltage Lockout with Hystersis
Low Start-Up and Operating Current
Pin:1. Compensation
Pin:2.
Voltage Feedback
Pin:3.
Current Sense
Pin:4.
R
T
/C
T
DIP-8
SOP-8
5
. Gnd
6. Output
7. Vcc
8. Vref
ORDERING INFORMATION
Device
PJ3844/3845BCD
PJ3844/3845BCS
Operating Temperature
(Ambient)
-20℃ TO +85
0
C
Package
DIP-8
SOP-8
SIMPLIFIED BLOCK DIAGRAM
Pin numbers adjacent to terminals are for the 8-pin dual-in-line package. Pin numbers in parenthesis are for the SOP-8 package
The document contains information on a new product.Specifications and information herein are subject to change without notice.
1-14
2004/11. Rev B

PJ3844 Related Products

PJ3844 PJ3845 PJ3844B PJ3845B PJ3844BCS PJ3845BCS PJ3845BCD PJ3844BCD
Description 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDIP8
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