UC3843AN2
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onsemi UC3843AN2

Manufacturer No:
UC3843AN2
Manufacturer:
onsemi
Package:
Bulk
Description:
SWITCHING CONTROLLER
Delivery:
Payment:
iso14001
iso45001
iso9001
iso13485

Product Introduction

Overview

The UC3843AN2 is a high-performance current mode PWM (Pulse Width Modulation) controller produced by onsemi. It is specifically designed for off-line and DC-to-DC converter applications, offering a cost-effective solution with minimal external components. This integrated circuit features a trimmed oscillator for precise duty cycle control, a temperature-compensated reference, a high-gain error amplifier, a current sensing comparator, and a high-current totem pole output ideal for driving power MOSFETs.

Key Specifications

ParameterValue
Clock SyncNo
Control FeaturesFrequency Control
Duty Cycle (Max)96%
FrequencyUp to 500kHz
FunctionStep-Up, Step-Up/Step-Down
Mounting TypeThrough Hole
Number of Outputs1
Operating Temperature0°C ~ 70°C (TA)
Output ConfigurationPositive, Isolation Capable
Output Phases1
Output TypeTransistor Driver
Package8-DIP (0.300", 7.62mm)
Supplier Device Package8-PDIP
Synchronous RectifierNo
TopologyBoost, Buck, Flyback, Forward
Voltage7.6V ~ 30V

Key Features

  • Trimmed oscillator for precise duty cycle control
  • Temperature-compensated reference
  • High-gain error amplifier
  • Current sensing comparator
  • High-current totem pole output for driving power MOSFETs
  • Protective features including input and reference undervoltage lockouts, cycle-by-cycle current limiting, and programmable output deadtime
  • Latch for single pulse metering

Applications

The UC3843AN2 is suitable for various off-line and DC-to-DC converter applications. It is commonly used in power supply designs that require high efficiency and reliability, such as in switching power supplies, DC-DC converters, and other power management systems. Its versatility in supporting multiple topologies (boost, buck, flyback, forward) makes it a versatile choice for a wide range of power conversion needs.

Q & A

  1. What is the primary function of the UC3843AN2?
    The UC3843AN2 is a high-performance current mode PWM controller designed for off-line and DC-to-DC converter applications.
  2. What is the maximum operating frequency of the UC3843AN2?
    The maximum operating frequency is up to 500kHz.
  3. What are the key protective features of the UC3843AN2?
    The key protective features include input and reference undervoltage lockouts, cycle-by-cycle current limiting, and programmable output deadtime.
  4. What is the operating temperature range of the UC3843AN2?
    The operating temperature range is 0°C ~ 70°C (TA).
  5. What are the supported topologies by the UC3843AN2?
    The supported topologies include boost, buck, flyback, and forward.
  6. What is the maximum duty cycle of the UC3843AN2?
    The maximum duty cycle is 96%.
  7. What type of output does the UC3843AN2 provide?
    The output type is a transistor driver.
  8. What is the package type of the UC3843AN2?
    The package type is 8-DIP (0.300", 7.62mm).
  9. Is the UC3843AN2 suitable for synchronous rectification?
    No, it does not support synchronous rectification.
  10. What is the voltage range for the UC3843AN2?
    The voltage range is 7.6V ~ 30V.

Product Attributes

Output Type:Transistor Driver
Function:Step-Up, Step-Up/Step-Down
Output Configuration:Positive, Isolation Capable
Topology:Boost, Buck, Flyback, Forward
Number of Outputs:1
Output Phases:1
Voltage - Supply (Vcc/Vdd):7.6V ~ 30V
Frequency - Switching:Up to 500kHz
Duty Cycle (Max):96%
Synchronous Rectifier:No
Clock Sync:No
Serial Interfaces:- 
Control Features:Frequency Control
Operating Temperature:0°C ~ 70°C (TA)
Mounting Type:Through Hole
Package / Case:8-DIP (0.300", 7.62mm)
Supplier Device Package:8-PDIP
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Similar Products

Part Number UC3843AN2 UC3843ANG UC3842AN2 UC3843AD2 UC3843AN
Manufacturer onsemi onsemi onsemi onsemi Texas Instruments
Product Status Active Obsolete Active Active Active
Output Type Transistor Driver Transistor Driver Transistor Driver Transistor Driver Transistor Driver
Function Step-Up, Step-Up/Step-Down Step-Up, Step-Up/Step-Down Step-Up, Step-Down, Step-Up/Step-Down Step-Up, Step-Up/Step-Down Step-Up, Step-Down, Step-Up/Step-Down
Output Configuration Positive, Isolation Capable Positive, Isolation Capable Positive, Isolation Capable Positive, Isolation Capable Positive, Isolation Capable
Topology Boost, Buck, Flyback, Forward Boost, Flyback Boost, Buck, Flyback, Forward Boost, Buck, Flyback, Forward Boost, Buck, Flyback, Forward
Number of Outputs 1 1 1 1 1
Output Phases 1 1 1 1 1
Voltage - Supply (Vcc/Vdd) 7.6V ~ 30V 8.4V ~ 30V 10V ~ 30V 7.6V ~ 30V 7.6V ~ 30V
Frequency - Switching Up to 500kHz Up to 500kHz Up to 500kHz Up to 500kHz Up to 500kHz
Duty Cycle (Max) 96% 96% 96% 96% 96%
Synchronous Rectifier No No No No No
Clock Sync No No No No No
Serial Interfaces - - - - -
Control Features Frequency Control 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) -40°C ~ 150°C (TJ) 0°C ~ 70°C (TA)
Mounting Type Through Hole Through Hole Through Hole Surface Mount Through Hole
Package / Case 8-DIP (0.300", 7.62mm) 8-DIP (0.300", 7.62mm) 8-DIP (0.300", 7.62mm) 8-SOIC (0.154", 3.90mm Width) 8-DIP (0.300", 7.62mm)
Supplier Device Package 8-PDIP 8-PDIP 8-PDIP 8-SOIC 8-PDIP

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