UC3845AN
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Texas Instruments UC3845AN

Manufacturer No:
UC3845AN
Manufacturer:
Texas Instruments
Package:
Bulk
Description:
IC REG CTRLR MULT TOPOLOGY 8DIP
Delivery:
Payment:
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Product Introduction

Overview

The UC3845AN is a current-mode PWM (Pulse Width Modulation) controller integrated circuit produced by Texas Instruments. This device is part of the UCx84x series, which is optimized for off-line and DC-to-DC converters. It features a low start-up current, automatic feedforward compensation, pulse-by-pulse current limiting, and enhanced load-response characteristics. The UC3845AN is suitable for a wide range of power supply applications, including switching regulators and transformer-coupled DC-DC converters.

Key Specifications

Parameter Value Unit
Manufacturer Texas Instruments
Package Type PDIP-8
Output Current 1 A
Maximum Switching Frequency 500 kHz
Topology Boost, Buck, Flyback, Forward
Maximum Duty Cycle 50%
Undervoltage Lockout (UVLO) 8.4V / 7.6V
Operating Temperature Range 0°C to 70°C
Pin Count 8
Rise Time 50 ns
Fall Time 50 ns

Key Features

  • Low start-up current (< 1 mA)
  • 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
  • Error amplifier with low output resistance

Applications

The UC3845AN is suitable for various power supply applications, including:

  • Switching regulators of any polarity
  • Transformer-coupled DC-DC converters
  • Off-line power supplies
  • DC-DC converters

Q & A

  1. What is the maximum switching frequency of the UC3845AN?

    The maximum switching frequency of the UC3845AN is 500 kHz.

  2. What is the output current capability of the UC3845AN?

    The UC3845AN can handle an output current of up to 1 A.

  3. What are the operating temperature ranges for the UC3845AN?

    The UC3845AN operates within a temperature range of 0°C to 70°C.

  4. What topologies does the UC3845AN support?

    The UC3845AN supports boost, buck, flyback, and forward topologies.

  5. What is the undervoltage lockout (UVLO) threshold for the UC3845AN?

    The UVLO thresholds for the UC3845AN are 8.4V and 7.6V.

  6. What is the maximum duty cycle of the UC3845AN?

    The maximum duty cycle of the UC3845AN is 50%.

  7. What package types are available for the UC3845AN?

    The UC3845AN is available in a PDIP-8 package.

  8. What are some key features of the UC3845AN?

    Key features include low start-up current, automatic feedforward compensation, pulse-by-pulse current limiting, and an internally trimmed bandgap reference).

  9. What are typical applications for the UC3845AN?

    Typical applications include switching regulators, transformer-coupled DC-DC converters, off-line power supplies, and DC-DC converters).

  10. How do I set the switching frequency for the UC3845AN?

    The switching frequency can be set using the timing resistor (RRT) and capacitor (CCT) connected to the RT/CT pin, with the frequency estimated by the equation fOSC = 1.72 / (RRT × CCT)).

Product Attributes

Output Type:Transistor Driver
Function:Step-Up, Step-Down, 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):48%
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 UC3845AN UC3845BN UC3845N UC3843AN UC3844AN UC3845AD UC3845AM
Manufacturer Texas Instruments STMicroelectronics Texas Instruments Texas Instruments Texas Instruments Texas Instruments Microsemi Corporation
Product Status Active Active Active Active 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-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 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, Flyback, Forward Boost, Flyback Boost, Buck, Buck-Boost, Flyback, Forward Boost, Buck, Flyback, Forward Boost, Buck, Flyback, Forward Boost, Buck, Flyback, Forward Boost, Buck, 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) 7.6V ~ 30V 7.6V ~ 30V 12V ~ 28V 7.6V ~ 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 Up to 500kHz Up to 500kHz
Duty Cycle (Max) 48% 48% 48% 96% 48% 48% 48%
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) -40°C ~ 150°C (TJ) 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 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) 8-DIP (0.300", 7.62mm) 8-DIP (0.300", 7.62mm) 14-SOIC (0.154", 3.90mm Width) 8-DIP (0.300", 7.62mm)
Supplier Device Package 8-PDIP 8-Mini DIP 8-PDIP 8-PDIP 8-PDIP 14-SOIC 8-DIP

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