UC3845BVD1G
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onsemi UC3845BVD1G

Manufacturer No:
UC3845BVD1G
Manufacturer:
onsemi
Package:
Bulk
Description:
IC REG CTRLR BOOST/FLYBACK 8SOIC
Delivery:
Payment:
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Product Introduction

Overview

The UC3845BVD1G is a high-performance fixed frequency current mode controller produced by onsemi. It is part of the UC3844B and UC3845B series, which are specifically designed for off-line and DC-DC converter applications. These controllers 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 (typical) kHz
Output Switching Frequency Up to 500 kHz kHz
Output Deadtime Adjustable 50% to 70% %
UVLO Thresholds (UC3845B) 8.5 V (on), 7.6 V (off) V
Maximum Output Current 1 A A
Maximum Power Supply Voltage 36 V V
Package Type SOIC-8
Operating Temperature Range -40°C to +105°C °C

Key Features

  • Trimmed Oscillator for Precise Frequency Control
  • Current Mode Operation up 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 and RoHS Compliant Packages

Applications

The UC3845BVD1G is designed for off-line and DC-DC converter applications. It is particularly useful in:

  • Power supplies for consumer electronics
  • Industrial power systems
  • Automotive power management
  • Telecommunication equipment
  • Other high-performance power conversion applications

Q & A

  1. What is the typical oscillator frequency of the UC3845BVD1G?

    The typical oscillator frequency is 250 kHz.

  2. What is the maximum output switching frequency of the UC3845BVD1G?

    The maximum output switching frequency is up to 500 kHz.

  3. What are the UVLO thresholds for the UC3845B?

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

  4. What is the maximum output current of the UC3845BVD1G?

    The maximum output current is 1 A.

  5. What is the operating temperature range of the UC3845BVD1G?

    The operating temperature range is -40°C to +105°C.

  6. What type of package is the UC3845BVD1G available in?

    The UC3845BVD1G is available in an SOIC-8 package.

  7. Does the UC3845BVD1G have protective features?
  8. Is the UC3845BVD1G Pb-Free and RoHS compliant?
  9. What are some common applications of the UC3845BVD1G?
  10. How does the UC3845BVD1G handle current limiting?

    The UC3845BVD1G features latching PWM for cycle-by-cycle current limiting.

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:-40°C ~ 105°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 UC3845BVD1G UC3845BVDG UC3843BVD1G UC3844BVD1G UC3845BD1G UC3845BVD1
Manufacturer onsemi onsemi onsemi onsemi onsemi onsemi
Product Status Obsolete Obsolete Obsolete Obsolete 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 10V ~ 36V 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
Duty Cycle (Max) 48% 48% 96% 48% 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 -40°C ~ 105°C (TA) -40°C ~ 105°C (TA) -40°C ~ 105°C (TA) -40°C ~ 105°C (TA) 0°C ~ 70°C (TA) -40°C ~ 105°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) 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) 8-SOIC (0.154", 3.90mm Width)
Supplier Device Package 8-SOIC 14-SOIC 8-SOIC 8-SOIC 8-SOIC 8-SOIC

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