Product Overview

Product Overview
UC2842B: High Performance Current Mode PWM Controller
For complete documentation, see the data sheet
Product Description
The UC3842B, UC3843B series are high performance fixed frequency current mode controllers. They are specifically designed for
Off-Line and dc-to-dc converter applications offering the designer a cost-effective solution with minimal external components. These
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.
These devices are available in an 8-pin dual-in-line and surface mount (SO-8) plastic package as well as the 14-pin plastic surface
mount (SO-14). The SO-14 package has separate power and ground pins for the totem pole output stage.
The UCX842B has UVLO thresholds of 16 V (on) and 10 V (off), ideally suited for off-line converters. The UCX843B is tailored for
lower voltage applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off).
Features
•
•
•
•
•
•
•
•
•
•
Trimmed Oscillator for Precise Frequency Control
Oscillator Frequency Guaranteed at 250 kHz
Current Mode Operation to 500 kHz
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 Hysteresis
Low Startup and Operating Current
Pb-Free Packages are Available
For more features, see the data sheet
Part Electrical Specifications
Product
Compliance
Status
Topolog
y
Control
Mode
fsw Typ
(kHz)
StandUVLO
by Mode (V)
Short
Circuit
Protecti
on
Latch
Soft
Start
VCC Max Drive
(V)
Cap.
(mA)
Packag
e Type
UC2842BD1G
PPAP
Capable
Active
Flyback
Current
Mode
52
No
Yes
Yes
No
No
30
200 /
200
SOIC-8
Active
Flyback
Current
Mode
52
No
Yes
Yes
No
No
30
200 /
200
SOIC-8
Active
Flyback
Current
Mode
52
No
Yes
Yes
No
No
30
200 /
200
SOIC14
Active
Flyback
Current
Mode
52
No
Yes
Yes
No
No
30
200 /
200
SOIC14
Active
Flyback
Current
Mode
52
No
Yes
Yes
No
No
30
200 /
200
PDIP-8
Pb-free
Halide free
UC2842BD1R2G
PPAP
Capable
Pb-free
Halide free
UC2842BDG
PPAP
Capable
Pb-free
Halide free
UC2842BDR2G
PPAP
Capable
Pb-free
Halide free
UC2842BNG
Pb-free
Halide free
For more information please contact your local sales support at www.onsemi.com
Created on: 6/30/2016