UC2843BN
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STMicroelectronics UC2843BN

Manufacturer No:
UC2843BN
Manufacturer:
STMicroelectronics
Package:
Tube
Description:
IC REG CTRLR BST/FLYBK 8-MINIDIP
Delivery:
Payment:
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Product Introduction

Overview

The UC2843BN is a high-performance current mode PWM (Pulse Width Modulation) controller from 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 features a trimmed oscillator for precise frequency control, automatic feed-forward compensation, and latching PWM for cycle-by-cycle current limiting. The device is suitable for driving N-Channel MOSFETs and includes an internally trimmed reference with under-voltage lockout and high current totem pole output stage.

Key Specifications

Parameter Symbol Min Typ Max Unit
Supply Voltage Vi - - 30 V
Output Current IO - - ±1 A A
Output Energy (Capacitive Load) EO - - 5 µJ µJ
Reference Output Voltage VREF 4.95 5.00 5.05 V
Oscillator Frequency fOSC 48 50 52 kHz
Under-Voltage Lockout Start Threshold - 7.8 8.4 9.0 V
Maximum Duty Cycle - 94 96 100 %
Operating Junction Temperature TJ -40 - 150 °C
Storage Temperature Range Tstg -65 - 150 °C

Key Features

  • Trimmed oscillator for precise frequency control up to 500 kHz.
  • Current mode operation with automatic feed-forward compensation.
  • Latching PWM for cycle-by-cycle current limiting.
  • Internally trimmed reference with under-voltage lockout and hysteresis.
  • High current totem pole output stage suitable for driving N-Channel MOSFETs.
  • Low start-up and operating current (less than 0.5 mA start-up current).
  • Precision error amplifier output available for loop compensation.
  • External clock synchronization capability.

Applications

The UC2843BN is ideal for various power management applications, including:

  • Off-line power supplies.
  • DC to DC converters.
  • Switch-mode power supplies.
  • High-frequency power conversion systems.
  • Industrial power supplies and motor control systems.

Q & A

  1. What is the primary function of the UC2843BN?

    The UC2843BN is a high-performance current mode PWM controller designed for implementing off-line or DC to DC fixed frequency current mode control schemes.

  2. What is the typical oscillator frequency of the UC2843BN?

    The typical oscillator frequency is around 50 kHz, but it can range from 48 kHz to 52 kHz depending on the configuration.

  3. What is the maximum duty cycle for the UC2843BN?

    The maximum duty cycle for the UC2843BN is up to 100%.

  4. What is the under-voltage lockout start threshold for the UC2843BN?

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

  5. What is the maximum output current of the UC2843BN?

    The maximum output current is ±1 A.

  6. Can the UC2843BN be synchronized with an external clock?
  7. What is the operating junction temperature range for the UC2843BN?

    The operating junction temperature range is from -40°C to 150°C.

  8. What is the storage temperature range for the UC2843BN?

    The storage temperature range is from -65°C to 150°C.

  9. What type of output stage does the UC2843BN have?

    The UC2843BN has a high current totem pole output stage suitable for driving N-Channel MOSFETs.

  10. What is the typical start-up current of the UC2843BN?

    The typical start-up current is less than 0.5 mA.

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):96%
Synchronous Rectifier:No
Clock Sync:No
Serial Interfaces:- 
Control Features:Frequency Control
Operating Temperature:-25°C ~ 85°C (TA)
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 UC2843BN UC2845BN UC2844BN UC2843N UC2843BNG UC2842BN UC2843AN UC2843BD
Manufacturer STMicroelectronics STMicroelectronics STMicroelectronics Texas Instruments onsemi STMicroelectronics Texas Instruments onsemi
Product Status Active Active Active Active Active Active Active Obsolete
Output Type Transistor Driver 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-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-Down, 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 Positive, Isolation Capable
Topology Boost, Flyback Boost, Flyback Boost, Flyback Boost, Buck, Buck-Boost, Flyback, Forward Boost, Flyback Boost, Flyback Boost, Buck, Flyback, Forward Boost, Flyback
Number of Outputs 1 1 1 1 1 1 1 1
Output Phases 1 1 1 1 1 1 1 1
Voltage - Supply (Vcc/Vdd) 7.6V ~ 30V 7.6V ~ 30V 10V ~ 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 Up to 500kHz
Duty Cycle (Max) 96% 48% 48% 97% 96% 96% 96% 96%
Synchronous Rectifier No No No No No No No No
Clock Sync No 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 Frequency Control
Operating Temperature -25°C ~ 85°C (TA) -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 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) 8-DIP (0.300", 7.62mm) 14-SOIC (0.154", 3.90mm Width)
Supplier Device Package 8-Mini DIP 8-Mini DIP 8-Mini DIP 8-PDIP 8-PDIP 8-Mini DIP 8-PDIP 14-SOIC

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