PJ3843B Datasheet, PDF (1/14 Pages) List of Unclassifed Manufacturers – High Performance Current Mode Controller

PJ3842B / PJ3843B
High Performance Current Mode Controller
T 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.
specifically designed for Off-Line and DC-to-DC converter
This device is available in 8-pin dual-in-line plastic
applications offering the designer a cost effective solution packages as well as the 8-pin plastic surface mount (SOP-8).
with minimal external components.This integrated circuits The SOP-8 package has separate power and ground pins for
feature a trimmed oscillator for precise duty cycle control, a the totem pole output stage.
temperature compensated reference, high gain error amplifier,
The PJ3842B has UVLO thresholds of 16V (on) and 10V
current sensing comparator,and a high current totem pole (off), ideally suited for off-line converters. The PJ3843B is
output ideally suited for driving a power MOSFET.
tailored for lowervoltage applications having UVLO
Also included are protective features consisting of input thresholds of 8.5V (on) and 7.6V (off).
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
• Undervoltage Lockout with Hystersis
• Low Start-Up and Operating Current
DIP-8
SOP-8
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
Operating Temperature
(Ambient)
Package
-20℃ TO +85℃
DIP-8
SOP-8
SIMPLIFIED BLOCK DIAGRAM
The document contains information on a new product.Specifications and information herein are subject to change without notice.
1-14
2004/11.Rev B