UC3843D8
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Texas Instruments UC3843D8

Manufacturer No:
UC3843D8
Manufacturer:
Texas Instruments
Package:
Tube
Description:
IC REG CTRLR MULT TOPOLOGY 8SOIC
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Payment:
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Product Introduction

Overview

The UC3843D8 is a single-ended current-mode PWM (Pulse Width Modulation) controller produced by Texas Instruments. It is part of the UCx84x series of control integrated circuits, designed to implement off-line and DC-to-DC fixed-frequency current-mode control schemes with a minimum number of external components. This device is optimized for use in power supply applications, offering features such as low start-up current, automatic feedforward compensation, and high-current totem-pole output. The UC3843D8 operates within a temperature range of 0°C to 70°C and is available in an 8-pin SOIC (D) package.

Key Specifications

ParameterValueUnit
PackageSOIC (D)-
Pins8-
Operating Temperature Range0 to 70°C
Supply VoltageUp to 30V
Output Current±1A
Maximum Duty Cycle100%-
Oscillation FrequencyUp to 500 kHz-
Start-Up Current< 1 mA-
UVLO Thresholds8.4V (on), 7.6V (off)V
Power Dissipation at TA≤25°C (8SOP)460 mW-

Key Features

  • Optimized for off-line and DC-to-DC converters
  • Low start-up current (< 1mA)
  • Automatic feedforward compensation
  • Pulse-by-pulse current limiting
  • Enhanced load-response characteristics
  • Undervoltage lockout with hysteresis
  • Double-pulse suppression
  • High-current totem-pole output
  • Internally trimmed bandgap reference
  • Up to 500kHz operation
  • Error amplifier with low output resistance

Applications

The UC3843D8 is specifically designed for use in off-line and DC-to-DC converter applications. It is suitable for a variety of power supply designs, including switch-mode power supplies, DC-DC converters, and other high-efficiency power conversion systems. The device's features make it particularly useful in applications requiring precise current-mode control and high reliability.

Q & A

  1. What is the operating temperature range of the UC3843D8?
    The UC3843D8 operates within a temperature range of 0°C to 70°C.
  2. What is the maximum duty cycle of the UC3843D8?
    The maximum duty cycle of the UC3843D8 is 100%.
  3. What is the typical start-up current of the UC3843D8?
    The start-up current of the UC3843D8 is less than 1 mA.
  4. What are the UVLO thresholds for the UC3843D8?
    The UVLO thresholds for the UC3843D8 are 8.4V (on) and 7.6V (off).
  5. What is the maximum oscillation frequency of the UC3843D8?
    The UC3843D8 can operate up to 500 kHz.
  6. What type of output stage does the UC3843D8 have?
    The UC3843D8 has a high-current totem-pole output stage designed for driving N-channel MOSFETs.
  7. What is the power dissipation of the UC3843D8 in an 8SOP package at TA≤25°C?
    The power dissipation of the UC3843D8 in an 8SOP package at TA≤25°C is 460 mW.
  8. Is the UC3843D8 suitable for DC-DC converter applications?
    Yes, the UC3843D8 is specifically designed for DC-DC converter applications.
  9. What type of compensation does the UC3843D8 offer?
    The UC3843D8 offers automatic feedforward compensation.
  10. How many pins does the UC3843D8 have?
    The UC3843D8 has 8 pins in a SOIC (D) package.

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):12V ~ 28V
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:Surface Mount
Package / Case:8-SOIC (0.154", 3.90mm Width)
Supplier Device Package:8-SOIC
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Similar Products

Part Number UC3843D8 UC3845D8 UC3844D8 UC3843DX UC3842D8 UC3843AD8 UC3843D
Manufacturer Texas Instruments Texas Instruments Texas Instruments onsemi Unitrode Texas Instruments Fairchild Semiconductor
Product Status Active Active Active Obsolete Active Active Obsolete
Output Type 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-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
Topology Boost, Buck, Buck-Boost, Flyback, Forward Boost, Buck, Buck-Boost, Flyback, Forward Boost, Buck, Buck-Boost, Flyback, Forward Boost, Flyback Boost, Buck, Buck-Boost, Flyback, Forward Boost, Buck, Flyback, Forward Boost, Buck, Buck-Boost, Flyback, Forward
Number of Outputs 1 1 1 1 1 1 1
Output Phases 1 1 1 1 1 1 1
Voltage - Supply (Vcc/Vdd) 12V ~ 28V 12V ~ 28V 12V ~ 28V 7.6V ~ 30V 12V ~ 28V 7.6V ~ 30V 7.6V ~ 30V
Frequency - Switching Up to 500kHz Up to 500kHz Up to 500kHz Up to 500kHz Up to 500kHz Up to 500kHz Up to 500kHz
Duty Cycle (Max) 97% 48% 48% 97% 97% 96% 97%
Synchronous Rectifier No No No No No No No
Clock Sync No No No No No No No
Serial Interfaces - - - - - - -
Control Features Frequency Control Frequency Control 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 (TA)
Mounting Type Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount
Package / Case 8-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width) 14-SOIC (0.209", 5.30mm Width) 8-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width) 14-SOIC (0.209", 5.30mm Width)
Supplier Device Package 8-SOIC 8-SOIC 8-SOIC 14-SOP 8-SOIC 8-SOIC 14-SOP

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