TEXAS INSTRUMENTS UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ Data Manual
Summary
The UC284x family of control ICs are advanced current-mode PWM controllers engineered for high-performance switched mode power supplies (SMPS). These pin-compatible devices feature significant improvements over previous generations, including ultra-low start-up current (<0.5 mA) and enhanced load response characteristics. This manual provides detailed technical specifications, electrical characteristics, and comparative data across the family members, making it essential for engineers designing robust off-line and DC-to-DC constant current converters requiring optimized efficiency and reliability.
Page 1 Text Content
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ CURRENT-MODE PWM CONTROLLER
SGLS164 – APRIL 2003
Extended Temperature Performance of D 8-PIN PACKAGE (TOP VIEW)
–40°C to 125°C Optimized for Off-line and DC to DC
COMP VREF
Converters
VFB VCC
Low Start Up Current (<0.5 m A)
ISENSE OUTPUT
Trimmed Oscillator Discharge Current
RT/CT GND
Automatic Feed Forward Compensation Pulse-by-Pulse Current Limiting
D 14-PIN PACKAGE Enhanced Load Response Characteristics (TOP VIEW)
Under-Voltage Lockout With Hysteresis
COMP VREF
Double Pulse Suppression NC NC
High Current Totem Pole Output VFB VCC NC VC
Internally Trimmed Bandgap Reference
ISENSE OUTPUT
500 k Hz Operation
NC GND
Low RO Error Amp
RT/CT PWR GND
description The UC2842A/3A/4A/5A family of control ICs is a pin for pin compatible improved version of the UC2842/3/4/5 family. Providing the necessary features to control current mode switched mode power supplies, this family has the following improved features. Start up current is guaranteed to be less than 0.5 m A. Oscillator discharge is trimmed to 8.3 m A. During under voltage lockout, the output stage can sink at least 10 m A at less than 1.2 V for VCC over 5 V. The difference between members of this family are shown in the table below.
PART NUMBER UVLO ON UVLO OFF MAXIMUM DUTY CYCLE UC2842A 16 V 10 V <100% UC2843A 8.5 V 7.9 V <100% UC2844A 16 V 10 V <50% UC2845A 8.5 V 7.9 V <50%
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright 2003, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
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Page Summary Contents For TEXAS INSTRUMENTS UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ Data Manual
Manual Details
| Brand | Texas Instruments |
|---|---|
| Pages | 15 |
| File Size | 590.48 KB |
| Published | May 31, 2026 |
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Frequently Asked Questions
What is the guaranteed maximum start-up current?
The start up current is guaranteed to be less than 0.5 mA.
How do I choose between the A, B, C, and D models?
Select the model based on your required Under-Voltage Lockout (UVLO) parameters and maximum duty cycle in the provided comparison table.
Can this controller operate in automotive or military environments?
It is not intended for these applications unless specifically documented by Texas Instruments as compliant with ISO/TS 16949 requirements.
What is the operational temperature range?
The device offers extended temperature performance ranging from -40°C to 125°C.