PJ3845B Datasheet, PDF (1/14 Pages) List of Unclassifed Manufacturers – High Performance Current Mode Controller

PJ3844B / PJ3845B
High Performance Current Mode Controller
T 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
designed for Off-Line and DC-to-DC converter applications output deadtimes to be programmed from 50% to 70%.
offering the designer a cost effective solution with minimal
This device is available in 8-pin dual-in-line plastic
external components.This integrated circuits feature a packages as well as the 8-pin plastic surface mount (SOP-8).
trimmed oscillator for precise duty cycle control, a The SOP-8 package has separate power and ground pins for
temperature compensated reference, high gain error amplifier, the totem pole output stage.
current sensing comparator,and a high current totem pole
The PJ3844B is tailored for lower voltage applications
output ideally suited for driving a power MOSFET.
having UVLO thresholds of 16V (on) 10V (off). ThePJ3845B
Also included are protective features consisting of input is tailored for lower voltage applications having UVLO
and reference undervoltage lockouts each with hysteresis, thresholds of 8.5V(on) and 7.6V(off).
FEATURES
y Trimmed Oscillator Discharge Current for Precise Duty
Cycle Control
y Current Mode Operation to 500KHz
y Automatic Feed Forward Compensation
y Latching PWM for Cycle-By-Cycle Current Limiting
y Internally Trimmed Reference with Undervoltage Lockout
y High Current Totem Pole Output
y Input Undervoltage Lockout with Hystersis
y 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
ORDERING INFORMATION
5. Gnd
6. Output
7. Vcc
8. Vref
Device
PJ3844/3845BCD
PJ3844/3845BCS
Operating Temperature
(Ambient)
-20℃ TO +85⁰C
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