UC3842J
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Unitrode UC3842J

Manufacturer No:
UC3842J
Manufacturer:
Unitrode
Package:
Bulk
Description:
UC3842 CURRENT-MODE PWM CONTROLL
Delivery:
Payment:
iso14001
iso45001
iso9001
iso13485

Product Introduction

Overview

The UC3842J is a current-mode PWM (Pulse Width Modulator) controller integrated circuit produced by Unitrode, now part of Texas Instruments. This IC is designed to provide efficient and cost-effective solutions for power supply design, particularly in DC-DC converters and off-line power supplies. It is optimized for good electrical performance and low cost, making it a versatile component in various power management applications.

Key Specifications

ParameterValueUnit
VCC (Low impedance source)30V
VFB and VISENSE (Analog input voltage)-0.3 to 6.3V
VCC (Input Voltage, Q and D Package only)30V
IOUTPUT (Output drive current)±1A
ICOMP (Error amplifier output sink current)10mA
EOUTPUT (Output energy, capacitive load)5µJ
TJ (Junction temperature)150°C
Tstg (Storage temperature)-65 to 150°C
IOUTPUT (Average output current)200mA
IVREF (Reference output current)-20mA
fOSC (Oscillator frequency)100 to 500kHz
TA (Operating free-air temperature)0 to 70°C

Key Features

  • Current-Mode Operation: Provides all the performance advantages of current-mode operation, including improved line and load regulation and easier implementation of overcurrent protection.
  • Low Cost: Designed to be cost-effective, using only two magnetic elements and an inexpensive control circuit.
  • Under-Voltage Lockout (UVLO): Ensures that VCC is adequate before enabling the output stage, with fixed turn-on and turn-off thresholds and a 6V hysteresis to prevent VCC oscillations.
  • Oscillator Programmability: Allows the oscillator frequency to be set using external timing resistor (RT) and capacitor (CT), with a maximum frequency of 500 kHz.
  • Maximum Duty Cycle Control: The UC3842 and UC3843 have a maximum duty cycle of approximately 100%, while the UC3844 and UC3845 are clamped to 50% maximum duty cycle.
  • Current Sensing and Limiting: External current-to-voltage conversion with ground-referenced resistor Rs, and internal clamping to prevent excessive current.
  • Error Amplifier Compensation: Allows for external compensation to control the converter’s closed-loop frequency response.
  • Totem-Pole Output: Single totem-pole output stage suitable for driving power MOSFETs or transistors.

Applications

  • DC-DC Converters: Suitable for various DC-DC converter topologies, including boost, buck, and flyback converters.
  • Off-Line Power Supplies: Optimized for efficient power sequencing of off-line converters.
  • Power MOSFET and Transistor Drivers: Designed to drive power MOSFETs or transistors in high-current applications.
  • Industrial and Consumer Electronics: Used in a wide range of industrial and consumer electronic devices requiring efficient power management.

Q & A

  1. What is the UC3842J used for? The UC3842J is a current-mode PWM controller used in DC-DC converters, off-line power supplies, and other power management applications.
  2. What are the key features of the UC3842J? Key features include current-mode operation, low cost, under-voltage lockout, oscillator programmability, and totem-pole output.
  3. What is the maximum oscillator frequency of the UC3842J? The maximum oscillator frequency is 500 kHz.
  4. How does the UC3842J handle current sensing and limiting? It uses external current-to-voltage conversion with a ground-referenced resistor Rs and internal clamping to prevent excessive current.
  5. What is the purpose of the error amplifier in the UC3842J? The error amplifier allows for external compensation to control the converter’s closed-loop frequency response.
  6. What are the operating temperature ranges for the UC3842J? The operating free-air temperature range is from 0°C to 70°C.
  7. Can the UC3842J be used in safety-critical applications? It is important to consult the datasheet and relevant safety guidelines before using the UC3842J in safety-critical applications.
  8. How does the UC3842J ensure VCC is adequate before enabling the output stage? It uses an under-voltage lockout (UVLO) circuit with fixed turn-on and turn-off thresholds and a 6V hysteresis.
  9. What types of converters can the UC3842J be used in? It can be used in boost, buck, and flyback converters, among others.
  10. What is the maximum duty cycle for the UC3842J? The UC3842 and UC3843 have a maximum duty cycle of approximately 100%, while the UC3844 and UC3845 are clamped to 50% maximum duty cycle.

Product Attributes

Output Type:- 
Function:- 
Output Configuration:- 
Topology:- 
Number of Outputs:- 
Output Phases:- 
Voltage - Supply (Vcc/Vdd):- 
Frequency - Switching:- 
Duty Cycle (Max):- 
Synchronous Rectifier:- 
Clock Sync:- 
Serial Interfaces:- 
Control Features:- 
Operating Temperature:- 
Mounting Type:- 
Package / Case:- 
Supplier Device Package:- 
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Similar Products

Part Number UC3842J UC3842N UC3842Q UC3843J UC3842D
Manufacturer Unitrode Texas Instruments Unitrode Unitrode Unitrode
Product Status Active Active Active Active Active
Output Type - Transistor Driver Transistor Driver Transistor Driver Transistor Driver
Function - Step-Up, Step-Down, Step-Up/Step-Down Step-Up, Step-Down, Step-Up/Step-Down Step-Up, Step-Down, Step-Up/Step-Down Step-Up, Step-Up/Step-Down
Output Configuration - Positive, Isolation Capable Positive, Isolation Capable Positive, Isolation Capable Positive, Isolation Capable
Topology - Boost, Buck, Buck-Boost, Flyback, Forward Boost, Buck, Buck-Boost, Flyback, Forward Boost, Buck, Buck-Boost, Flyback, Forward Boost, Flyback
Number of Outputs - 1 1 1 1
Output Phases - 1 1 1 1
Voltage - Supply (Vcc/Vdd) - 12V ~ 28V - 12V ~ 28V 10V ~ 30V
Frequency - Switching - Up to 500kHz Up to 500kHz Up to 500kHz Up to 500kHz
Duty Cycle (Max) - 97% 97% 97% 97%
Synchronous Rectifier - No No No No
Clock Sync - No No No No
Serial Interfaces - - - - -
Control Features - Frequency Control Frequency Control Frequency Control Frequency Control
Operating Temperature - 0°C ~ 70°C (TA) 0°C ~ 70°C (TA) 0°C ~ 70°C (TA) 0°C ~ 70°C (TA)
Mounting Type - Through Hole Surface Mount Through Hole Surface Mount
Package / Case - 8-DIP (0.300", 7.62mm) 20-LCC (J-Lead) 8-CDIP (0.300", 7.62mm) 14-SOIC (0.209", 5.30mm Width)
Supplier Device Package - 8-PDIP 20-PLCC (9x9) 8-CDIP 14-SOP

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