UC3845ADM-TR
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Microchip Technology UC3845ADM-TR

Manufacturer No:
UC3845ADM-TR
Manufacturer:
Microchip Technology
Package:
Tape & Reel (TR)
Description:
IC REG CTRLR BUCK/BOOST 8SOIC
Delivery:
Payment:
iso14001
iso45001
iso9001
iso13485

Product Introduction

Overview

The UC3845ADM-TR is a fixed-frequency current-mode PWM (Pulse Width Modulation) controller produced by Microchip Technology. This component is designed for off-line and DC-DC converter applications, offering a versatile solution for power management needs. The UC3845ADM-TR is part of the UC3842/UC3843/UC3844/UC3845 family, known for its reliability and performance in various power conversion topologies.

Key Specifications

Category Value
Manufacturer Microchip Technology
Package Tape & Reel (TR), Cut Tape (CT), Digi-Reel®
RoHS RoHS Compliant
Function Step-Up, Step-Down
Topology Boost, Buck, Flyback, Forward
Output Type Transistor Driver
Mounting Type Surface Mount
Output Phases 1
Package / Case 8-SOIC (0.154", 3.90mm Width)
Control Features Frequency Control
Duty Cycle (Max) 48%
Number of Outputs 1
Frequency - Switching Up to 500kHz
Operating Temperature 0°C ~ 70°C (TA)
Voltage - Supply (Vcc/Vdd) 7.6V ~ 30V
Start Threshold 7.8V ~ 9.0V
Min. Operating Voltage (After Turn On) 7.0V ~ 8.2V

Key Features

  • Current-Mode PWM Control: The UC3845ADM-TR operates in current-mode, providing precise control over the output current, which is essential for stable and efficient power conversion.
  • Fixed Frequency Operation: It operates at a fixed frequency, which can be set using external components, allowing for easier design and implementation.
  • Multiple Topologies Support: The controller supports various power conversion topologies including boost, buck, flyback, and forward configurations, making it versatile for different applications.
  • High Switching Frequency: The controller can operate up to 500kHz, enabling the use of smaller components and reducing the overall size of the power supply.
  • Under-Voltage Lockout (UVLO): The UC3845ADM-TR features an under-voltage lockout to prevent the controller from operating below a specified voltage threshold, ensuring safe and reliable operation.
  • Low Standby Current: The controller has a low standby current, which is beneficial for applications where power efficiency is critical.

Applications

  • Off-Line Power Supplies: The UC3845ADM-TR is widely used in off-line power supplies due to its ability to handle high voltage and current requirements.
  • DC-DC Converters: It is suitable for various DC-DC converter applications, including buck, boost, flyback, and forward converters.
  • Industrial Power Systems: The controller is used in industrial power systems where reliability and efficiency are paramount.
  • Automotive Systems: It can be found in automotive systems that require robust and efficient power management.
  • Consumer Electronics: The UC3845ADM-TR is also used in consumer electronics where compact and efficient power supplies are necessary.

Q & A

  1. What is the UC3845ADM-TR used for?

    The UC3845ADM-TR is a fixed-frequency current-mode PWM controller used for off-line and DC-DC converter applications.

  2. What are the supported topologies by the UC3845ADM-TR?

    The controller supports boost, buck, flyback, and forward power conversion topologies.

  3. What is the maximum switching frequency of the UC3845ADM-TR?

    The maximum switching frequency is up to 500kHz.

  4. What is the operating temperature range of the UC3845ADM-TR?

    The operating temperature range is from 0°C to 70°C.

  5. What is the supply voltage range for the UC3845ADM-TR?

    The supply voltage range is from 7.6V to 30V.

  6. Does the UC3845ADM-TR have under-voltage lockout protection?

    Yes, the UC3845ADM-TR features under-voltage lockout protection to prevent operation below a specified voltage threshold.

  7. What is the maximum duty cycle of the UC3845ADM-TR?

    The maximum duty cycle is 48%.

  8. Is the UC3845ADM-TR RoHS compliant?

    Yes, the UC3845ADM-TR is RoHS compliant.

  9. What is the package type of the UC3845ADM-TR?

    The package type is 8-SOIC (0.154", 3.90mm Width).

  10. Is the UC3845ADM-TR still in production?

    No, the UC3845ADM-TR is discontinued at Digi-Key but may still be available from other suppliers or as obsolete stock.

Product Attributes

Output Type:Transistor Driver
Function: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:Surface Mount
Package / Case:8-SOIC (0.154", 3.90mm Width)
Supplier Device Package:8-SOIC
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