PJ3842B / PJ3843B
High Performance Current Mode Controller
1-14
2004/11.Rev B
he PJ3842B and PJ3843B series are high performance
fixed frequency current mode controllers. This is
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,
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).
•
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
5. Gnd
Pin：2. Voltage Feedback
6. Output
Pin：3. Current Sense
7. Vcc
Pin：4. RT/CT
8. Vref
Device
Operating Temperature
(Ambient)
Package
PJ3842/3843BCD
DIP-8
PJ3842/3843BCS
-20℃ TO +85℃
SOP-8
SIMPLIFIED BLOCK DIAGRAM
The document contains information on a new product.Specifications and information herein are subject to change without notice.
T
ORDERING INFORMATION
FEATURES
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
