UC2845BN
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STMicroelectronics UC2845BN

Manufacturer No:
UC2845BN
Manufacturer:
STMicroelectronics
Package:
Tube
Description:
IC REG CTRLR BST/FLYBK 8-MINIDIP
Delivery:
Payment:
iso14001
iso45001
iso9001
iso13485

Product Introduction

Overview

The UC2845BN is a high-performance current mode PWM (Pulse Width Modulation) controller produced by STMicroelectronics. This IC is part of the UC284xB family, designed to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. It is particularly suited for medium power quasi-resonant ZVS (Zero Voltage Switching) flyback converters and can replace traditional melting fuses in automotive power distribution systems.

Key Specifications

Parameter Value Unit
Supply Voltage (low impedance source) 30 V
Supply Voltage (Ii < 30mA) 30 V
Output Current ±1 A
Output Energy (capacitive load) 5 µJ
Analog Inputs (pins 2, 3) –0.3 to 5.5 V
Error Amplifier Output Sink Current 10 mA
Power Dissipation at Tamb ≤ 25 °C (Minidip) 1.25 W
Power Dissipation at Tamb ≤ 25 °C (SO8) 800 mW
Storage Temperature Range –65 to 150 °C
Junction Operating Temperature –40 to 150 °C
Lead Temperature (soldering 10s) 300 °C
Oscillator Frequency 49 to 250 KHz
Maximum Duty Cycle 47 to 50% %
Under-Voltage Lockout Start Threshold 7.8 to 9.0 V
Under-Voltage Lockout Minimum Operating Voltage After Turn-on 7.0 to 8.2 V

Key Features

  • Internally Trimmed Oscillator: Provides precise frequency control up to 250 kHz.
  • Current Mode Operation: Supports operation up to 500 kHz.
  • Automatic Feed Forward Compensation: Enhances stability and performance.
  • Latching PWM for Cycle-by-Cycle Current Limiting: Ensures robust current control.
  • Internally Trimmed Reference with Under-Voltage Lockout: Offers accurate voltage regulation and protection.
  • High Current Totem Pole Output: Capable of sourcing or sinking high peak currents up to 1 A.
  • Low Start-Up and Operating Current: Minimizes power consumption during start-up and operation.
  • Programmable Oscillator Frequency and Duty Cycle: Allows for flexible design configurations using external resistors and capacitors.

Applications

  • Off-Line and DC to DC Converters: Suitable for fixed frequency current mode control schemes.
  • Automotive Power Distribution Systems: Can replace traditional melting fuses, enhancing reliability and efficiency.
  • Quasi-Resonant ZVS Flyback Converters: Ideal for medium power applications requiring high efficiency and low noise.
  • Industrial Power Supplies: Used in various industrial power supply designs requiring robust and efficient PWM control.

Q & A

  1. What is the maximum supply voltage for the UC2845BN?

    The maximum supply voltage is 30 V.

  2. What is the range of the oscillator frequency for the UC2845BN?

    The oscillator frequency can range from 49 kHz to 250 kHz.

  3. What is the maximum duty cycle for the UC2845BN?

    The maximum duty cycle is between 47% and 50%.

  4. What is the under-voltage lockout start threshold for the UC2845BN?

    The under-voltage lockout start threshold is between 7.8 V and 9.0 V.

  5. What is the minimum operating voltage after turn-on for the UC2845BN?

    The minimum operating voltage after turn-on is between 7.0 V and 8.2 V.

  6. What is the maximum output current of the UC2845BN?

    The maximum output current is ±1 A.

  7. How is the oscillator frequency programmed in the UC2845BN?

    The oscillator frequency is programmed by connecting a resistor (RT) to Vref and a capacitor (CT) to ground.

  8. What type of applications is the UC2845BN suitable for?

    The UC2845BN is suitable for off-line and DC to DC converters, automotive power distribution systems, and quasi-resonant ZVS flyback converters.

  9. What are the key features of the UC2845BN's output stage?

    The output stage is a high current totem pole output capable of sourcing or sinking high peak currents up to 1 A.

  10. How does the UC2845BN handle current limiting?

    The UC2845BN uses 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 ~ 150°C (TJ)
Mounting Type:Through Hole
Package / Case:8-DIP (0.300", 7.62mm)
Supplier Device Package:8-Mini DIP
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Similar Products

Part Number UC2845BN UC2845BNG UC2845N UC2843BN UC2844BN UC2845AN UC2845BD
Manufacturer STMicroelectronics onsemi Texas Instruments STMicroelectronics STMicroelectronics Texas Instruments onsemi
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-Up/Step-Down Step-Up, Step-Up/Step-Down Step-Up, Step-Down, 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 Positive, Isolation Capable
Topology Boost, Flyback Boost, Flyback Boost, Buck, Flyback, Forward Boost, Flyback Boost, Flyback Boost, Buck, Flyback, Forward Boost, Flyback
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 -40°C ~ 150°C (TJ) -25°C ~ 85°C (TA) -40°C ~ 85°C (TA) -25°C ~ 85°C (TA) -25°C ~ 85°C (TA) -40°C ~ 85°C (TA) -25°C ~ 85°C (TA)
Mounting Type Through Hole Through Hole Through Hole Through Hole Through Hole Through Hole Surface Mount
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) 8-DIP (0.300", 7.62mm) 14-SOIC (0.154", 3.90mm Width)
Supplier Device Package 8-Mini DIP 8-PDIP 8-PDIP 8-Mini DIP 8-Mini DIP 8-PDIP 14-SOIC

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