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Promax-Johnton Semiconductor - (PJ3842B / PJ3843B) High Performance Current Mode Controller

Numéro de référence PJ3842B
Description (PJ3842B / PJ3843B) High Performance Current Mode Controller
Fabricant Promax-Johnton Semiconductor 
Logo Promax-Johnton Semiconductor 





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PJ3842B fiche technique
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
Pin1. Compensation
Pin2. Voltage Feedback
Pin3. Current Sense
Pin4. RT/CT
5. Gnd
6. Output
7. Vcc
8. Vref
ORDERING INFORMATION
Device
PJ3842/3843BCD
PJ3842/3843BCS
Operating Temperature
(Ambient)
Package
-20TO +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

PagesPages 14
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