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Enabling Energy Efficient Solutions
Product Overview
Created on: 10/26/2011
UC3842B: 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
Part Electrical Specifications
Product
Compliance
Status
Topolog
y
Control
Mode
f
sw
Typ
(kHz)
Stand-
by
Mode
No
UVLO
(V)
Short
Circuit
Protecti
on
Yes
Latch
Soft
Start
V
CC
Max (V)
Drive
Cap.
(mA)
200 /
200
200 /
200
200 /
200
200 /
200
200 /
200
200 /
200
200 /
200
200 /
200
Packag
e Type
UC3842BD1G
Pb-free
Halide free
Active
Flyback
Current
Mode
Current
Mode
Current
Mode
Current
Mode
Current
Mode
Current
Mode
Current
Mode
Current
Mode
52
Yes
No
No
30
SOIC-8
UC3842BD1R2G
Pb-free
Halide free
Active
Flyback
52
No
Yes
Yes
No
No
30
SOIC-8
UC3842BDG
Pb-free
Halide free
Active
Flyback
52
No
Yes
Yes
No
No
30
SOIC-
14
SOIC-
14
PDIP-8
UC3842BDR2G
Pb-free
Halide free
Active
Flyback
52
No
Yes
Yes
No
Yes
30
UC3842BNG
Pb-free
Halide free
Active
Flyback
52
No
Yes
Yes
No
No
30
UC3842BVD1G
Pb-free
Halide free
Active
Flyback
52
No
Yes
Yes
No
Yes
30
SOIC-8
UC3842BVD1R2G
Pb-free
Halide free
Active
Flyback
52
No
Yes
Yes
No
No
30
SOIC-8
UC3842BVDR2G
Pb-free
Halide free
Active
Flyback
52
No
Yes
Yes
No
Yes
30
SOIC-
14
Microcontroller MCU
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