UC3843N
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Fairchild Semiconductor UC3843N

Manufacturer No:
UC3843N
Manufacturer:
Fairchild Semiconductor
Package:
Tube
Description:
SWITCHING CONTROLLER
Delivery:
Payment:
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Product Introduction

Overview

The UC3843N is a fixed frequency current-mode PWM (Pulse Width Modulation) controller produced by Fairchild Semiconductor. It is specifically designed for off-line and DC to DC converter applications, requiring 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 for driving a Power MOSFET.

Key Specifications

Parameter Symbol Value Unit
Supply Voltage VCC 30 V
Output Current IO ±1 A
Analog Inputs (Pin 2,3) V(ANA) -0.3 to 6.3 V
Error Amp Output Sink Current ISINK (E.A) 10 mA
Power Dissipation at TA≤25°C (8DIP) PD 1200 mW
Storage Temperature Range TSTG -65 ~ +150 °C
Oscillation Frequency f 47 to 57 kHz
Maximum Duty Cycle D(Max) 95 to 100 %
Start Threshold VTH(ST) 7.8 to 9.0 V
Minimum Operating Voltage (After Turn On) VOPR(MIN) 7.0 to 8.2 V

Key Features

  • Fixed Frequency Current-Mode PWM Controller
  • Low Start Up Current
  • Maximum Duty Clamp
  • UVLO (Under-Voltage Lockout) with Hysteresis
  • Operating Frequency up to 500kHz
  • Trimmed Oscillator for Precise Duty Cycle Control
  • Temperature-Compensated Reference
  • High Gain Error Amplifier
  • Current Sensing Comparator
  • High Current Totem-Pole Output for Driving a Power MOSFET

Applications

The UC3843N is designed for various power conversion applications, including:

  • Off-Line Converters
  • DC to DC Converters
  • Step-Up, Step-Down, and Step-Up/Step-Down Converters
  • High Efficiency Power Supplies

Q & A

  1. What is the primary function of the UC3843N?

    The UC3843N is a fixed frequency current-mode PWM controller designed for off-line and DC to DC converter applications.

  2. What is the operating frequency range of the UC3843N?

    The UC3843N operates at frequencies up to 500kHz.

  3. What are the key features of the UC3843N?

    Key features include low start-up current, maximum duty clamp, UVLO with hysteresis, and a high current totem-pole output.

  4. What is the supply voltage range for the UC3843N?

    The supply voltage range is up to 30V.

  5. What is the maximum duty cycle of the UC3843N?

    The maximum duty cycle is 95% to 100%.

  6. What are the typical applications of the UC3843N?

    Typical applications include off-line converters, DC to DC converters, and high efficiency power supplies.

  7. What is the storage temperature range for the UC3843N?

    The storage temperature range is -65°C to +150°C.

  8. How does the UVLO feature work in the UC3843N?

    The UVLO feature ensures the device operates only when the supply voltage exceeds a certain threshold (7.8V to 9.0V) and has hysteresis to prevent oscillations.

  9. What is the power dissipation at TA≤25°C for the 8DIP package?

    The power dissipation at TA≤25°C for the 8DIP package is 1200mW.

  10. Can the UC3843N operate at 100% duty cycle?

    Yes, the UC3843N can operate within a 100% duty cycle.

Product Attributes

Output Type:Transistor Driver
Function:Step-Up, Step-Down, Step-Up/Step-Down
Output Configuration:Positive, Isolation Capable
Topology:Boost, Buck, Buck-Boost, Flyback, Forward
Number of Outputs:1
Output Phases:1
Voltage - Supply (Vcc/Vdd):7.6V ~ 30V
Frequency - Switching:Up to 500kHz
Duty Cycle (Max):97%
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-DIP
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Similar Products

Part Number UC3843N UC3845N UC3844N UC3841N UC3842N UC3843AN UC3843BN UC3843D UC3843J
Manufacturer Fairchild Semiconductor Texas Instruments Texas Instruments Texas Instruments Texas Instruments Texas Instruments STMicroelectronics Fairchild Semiconductor Unitrode
Product Status Obsolete Active Active Active Active Active Active Obsolete Active
Output Type Transistor Driver Transistor Driver Transistor Driver Transistor Driver Transistor Driver 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 Step-Up, Step-Down, 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 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 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, Forward Converter Boost, Buck, Buck-Boost, Flyback, Forward Boost, Buck, Flyback, Forward Boost, Flyback Boost, Buck, Buck-Boost, Flyback, Forward Boost, Buck, Buck-Boost, Flyback, Forward
Number of Outputs 1 1 1 1 1 1 1 1 1
Output Phases 1 1 1 1 1 1 1 1 1
Voltage - Supply (Vcc/Vdd) 7.6V ~ 30V 12V ~ 28V 12V ~ 28V 8V ~ 32V 12V ~ 28V 7.6V ~ 30V 7.6V ~ 30V 7.6V ~ 30V 12V ~ 28V
Frequency - Switching Up to 500kHz Up to 500kHz Up to 500kHz 500kHz Up to 500kHz Up to 500kHz Up to 500kHz Up to 500kHz Up to 500kHz
Duty Cycle (Max) 97% 48% 48% 95% 97% 96% 96% 97% 97%
Synchronous Rectifier No No No No No No No No No
Clock Sync No No No No No No No No No
Serial Interfaces - - - - - - - - -
Control Features Frequency Control Frequency Control Frequency Control Current Limit, Enable, Frequency Control, Ramp, Reset, Soft Start 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) 0°C ~ 70°C (TA) 0°C ~ 70°C (TA) 0°C ~ 70°C (TA) 0°C ~ 70°C (TJ) 0°C ~ 70°C (TA) 0°C ~ 70°C (TA)
Mounting Type Through Hole Through Hole Through Hole Through Hole 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) 18-DIP (0.300", 7.62mm) 8-DIP (0.300", 7.62mm) 8-DIP (0.300", 7.62mm) 8-DIP (0.300", 7.62mm) 14-SOIC (0.209", 5.30mm Width) 8-CDIP (0.300", 7.62mm)
Supplier Device Package 8-DIP 8-PDIP 8-PDIP 18-PDIP 8-PDIP 8-PDIP 8-Mini DIP 14-SOP 8-CDIP

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