UC3845BD1R2G
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onsemi UC3845BD1R2G

Manufacturer No:
UC3845BD1R2G
Manufacturer:
onsemi
Package:
Tape & Reel (TR)
Description:
IC REG CTRLR BOOST/FLYBACK 8SOIC
Delivery:
Payment:
iso14001
iso45001
iso9001
iso13485

Product Introduction

Overview

The UC3845BD1R2G is a high-performance fixed frequency current mode controller produced by onsemi. It is part of the UC3844B and UC3845B series, designed specifically for off-line and dc-to-dc converter applications. These integrated circuits offer a cost-effective solution with minimal external components, making them ideal for a variety of power management needs.

The device features an oscillator, a temperature-compensated reference, a high-gain error amplifier, a current sensing comparator, and a high current totem pole output. This configuration is well-suited for driving power MOSFETs and includes protective features such as input and reference undervoltage lockouts, cycle-by-cycle current limiting, and adjustable output deadtimes.

Key Specifications

Parameter Value Unit
Oscillator Frequency 250 kHz kHz
Output Switching Frequency Up to 500 kHz kHz
Output Deadtime Adjustable 50% to 70% %
Undervoltage Lockout (UVLO) Thresholds 8.5 V (on), 7.6 V (off) V
Maximum Power Supply Voltage 36 V V
Output Current (Source or Sink) 1.0 A A
Operating Ambient Temperature 0 to +70°C °C
Package Type SOIC-8

Key Features

  • Trimmed Oscillator for Precise Frequency Control
  • Current Mode Operation to 500 kHz Output Switching Frequency
  • Output Deadtime Adjustable from 50% to 70%
  • Automatic Feed Forward Compensation
  • Latching PWM for Cycle-By-Cycle Current Limiting
  • Internally Trimmed Reference with Undervoltage Lockout
  • High Current Totem Pole Output
  • Undervoltage Lockout with Hysteresis
  • Low Startup and Operating Current
  • Pb-Free Packages are Available and RoHS Compliant

Applications

The UC3845BD1R2G is designed for various power management applications, including:

  • Off-line converters
  • Dc-to-dc converters
  • Power supplies requiring high efficiency and reliability
  • Switch-mode power supplies
  • Other applications requiring precise current mode control

Q & A

  1. What is the primary function of the UC3845BD1R2G?

    The UC3845BD1R2G is a high-performance fixed frequency current mode controller designed for off-line and dc-to-dc converter applications.

  2. What is the oscillator frequency of the UC3845BD1R2G?

    The oscillator frequency is guaranteed at 250 kHz.

  3. What is the maximum output switching frequency of the UC3845BD1R2G?

    The maximum output switching frequency is up to 500 kHz.

  4. What are the undervoltage lockout (UVLO) thresholds for the UC3845BD1R2G?

    The UVLO thresholds are 8.5 V (on) and 7.6 V (off).

  5. What is the maximum power supply voltage for the UC3845BD1R2G?

    The maximum power supply voltage is 36 V.

  6. What is the output current capability of the UC3845BD1R2G?

    The output current capability is 1.0 A (source or sink).

  7. What are the operating temperature ranges for the UC3845BD1R2G?

    The operating ambient temperature range is 0 to +70°C.

  8. In what package types is the UC3845BD1R2G available?

    The UC3845BD1R2G is available in SOIC-8 and SOIC-14 packages.

  9. Does the UC3845BD1R2G have protective features?

    Yes, it includes protective features such as input and reference undervoltage lockouts, cycle-by-cycle current limiting, and adjustable output deadtimes.

  10. Is the UC3845BD1R2G Pb-free and RoHS compliant?

    Yes, the UC3845BD1R2G is Pb-free and RoHS compliant.

Product Attributes

Output Type:Transistor Driver
Function:Step-Up, Step-Up/Step-Down
Output Configuration:Positive, Isolation Capable
Topology:Boost, Flyback
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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Similar Products

Part Number UC3845BD1R2G UC3845BVD1R2G UC3845BDR2G UC3843BD1R2G UC3844BD1R2G UC3845BD1R2
Manufacturer onsemi onsemi onsemi onsemi onsemi onsemi
Product Status Active Active Active Active Active Obsolete
Output Type Transistor Driver 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-Up/Step-Down Step-Up, Step-Up/Step-Down Step-Up, Step-Up/Step-Down Step-Up, Step-Up/Step-Down
Output Configuration Positive, Isolation Capable Positive, Isolation Capable Positive, Isolation Capable Positive, Isolation Capable Positive, Isolation Capable Positive, Isolation Capable
Topology Boost, Flyback Boost, Flyback Boost, Flyback Boost, Flyback Boost, Flyback Boost, Flyback
Number of Outputs 1 1 1 1 1 1
Output Phases 1 1 1 1 1 1
Voltage - Supply (Vcc/Vdd) 7.6V ~ 30V 7.6V ~ 30V 7.6V ~ 30V 7.6V ~ 30V 10V ~ 36V 7.6V ~ 30V
Frequency - Switching 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%
Synchronous Rectifier No No No No No No
Clock Sync No No No No No No
Serial Interfaces - - - - - -
Control Features Frequency Control Frequency Control Frequency Control Frequency Control Frequency Control Frequency Control
Operating Temperature 0°C ~ 70°C (TA) -40°C ~ 105°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
Package / Case 8-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width) 14-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width)
Supplier Device Package 8-SOIC 8-SOIC 14-SOIC 8-SOIC 8-SOIC 8-SOIC

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