UC2846NG4
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Texas Instruments UC2846NG4

Manufacturer No:
UC2846NG4
Manufacturer:
Texas Instruments
Package:
Tube
Description:
IC REG CTRLR MULT TOPOLOGY 16DIP
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Payment:
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Product Introduction

Overview

The UC2846NG4 is a current-mode PWM (Pulse Width Modulation) controller produced by Texas Instruments. It is part of the UCx846/7 family of control devices, designed to implement fixed-frequency, current-mode control schemes in power conversion applications. This device is known for its minimal external parts count, making it a versatile and efficient solution for various power supply designs.

The UC2846NG4 features a range of internal circuits, including under-voltage lockout, a precision reference voltage, logic for latched operation, a PWM comparator with current limit control, and a totem pole output stage capable of sourcing or sinking high-peak currents. These features contribute to improved line regulation, enhanced load response characteristics, and simpler control loop design.

Key Specifications

Parameter Min Max Unit
Supply Voltage (Pin 15) - - 40 V
Collector Supply Voltage (Pin 13) - - 40 V
Operating Temperature Range -40 - 85 °C
ESD Ratings (HBM) - - ±2500 V
ESD Ratings (CDM) - - ±1500 V
Reference Voltage Output 4.95 5.1 5.25 V
Error Amplifier Input Offset Voltage 0.5 - 10 mV
Output Collector-Emitter Voltage - - 40 V
Output Current (Peak) - - 500 mA

Key Features

  • Automatic Feedforward Compensation: Enhances line regulation and load response.
  • Programmable Pulse-by-Pulse Current Limiting: Provides robust overcurrent protection.
  • Automatic Symmetry Correction in Push-Pull Configuration: Ensures balanced operation in push-pull converters.
  • Enhanced Load Response Characteristics: Improves the dynamic response of the power supply.
  • Parallel Operation Capability: Allows multiple power modules to operate in parallel with equal current sharing.
  • Differential Current Sense Amplifier with Wide Common Mode Range: Enables remote and noise-free current sensing.
  • Double-Pulse Suppression Protection: Prevents double-pulsing in the output stage.
  • Undervoltage Lockout and Soft-Start Capability: Ensures safe startup and shutdown operations.
  • Shutdown Terminal: Allows for external shutdown control with latching or automatic restart options.
  • ±1% Band Gap Reference: Provides a precise reference voltage for the error amplifier.

Applications

  • Telecommunication Power Converters: Suitable for high-reliability power supplies in telecommunication systems.
  • Industrial Power Converters: Used in various industrial power conversion applications requiring high efficiency and reliability.
  • DC-to-DC Converters: Ideal for fixed-frequency, current-mode controlled DC-to-DC conversion systems.
  • Off-Line Power Supplies: Applicable in off-line power supplies that require robust and efficient control mechanisms.

Q & A

  1. What is the operating temperature range of the UC2846NG4?

    The operating temperature range of the UC2846NG4 is -40°C to 85°C.

  2. What is the maximum supply voltage for the UC2846NG4?

    The maximum supply voltage for the UC2846NG4 is 40 V.

  3. What type of output stage does the UC2846NG4 have?

    The UC2846NG4 has a totem pole output stage capable of sourcing or sinking high-peak currents.

  4. Does the UC2846NG4 support parallel operation of power modules?

    Yes, the UC2846NG4 supports parallel operation of power modules with equal current sharing.

  5. What is the purpose of the differential current sense amplifier in the UC2846NG4?

    The differential current sense amplifier allows for remote and noise-free sensing of peak switch current.

  6. How does the UC2846NG4 handle overcurrent protection?

    The UC2846NG4 features programmable pulse-by-pulse current limiting for robust overcurrent protection.

  7. What is the function of the shutdown terminal in the UC2846NG4?

    The shutdown terminal allows for external shutdown control with options for latching or automatic restart.

  8. What is the accuracy of the band gap reference in the UC2846NG4?

    The band gap reference in the UC2846NG4 is trimmed to ±1% accuracy.

  9. Can the UC2846NG4 be used in telecommunication power converters?

    Yes, the UC2846NG4 is suitable for high-reliability power supplies in telecommunication systems.

  10. What type of ESD protection does the UC2846NG4 have?

    The UC2846NG4 has ESD protection rated at ±2500 V (HBM) and ±1500 V (CDM).

Product Attributes

Output Type:Transistor Driver
Function:Step-Up, Step-Up/Step-Down
Output Configuration:Positive
Topology:Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull
Number of Outputs:2
Output Phases:1
Voltage - Supply (Vcc/Vdd):6.95V ~ 40V
Frequency - Switching:500kHz
Duty Cycle (Max):50%
Synchronous Rectifier:Yes
Clock Sync:Yes
Serial Interfaces:- 
Control Features:Current Limit, Enable, Frequency Control, Soft Start
Operating Temperature:-40°C ~ 85°C (TA)
Mounting Type:Through Hole
Package / Case:16-DIP (0.300", 7.62mm)
Supplier Device Package:16-PDIP
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Similar Products

Part Number UC2846NG4 UC2856NG4 UC2843NG4 UC2844NG4 UC2845NG4
Manufacturer Texas Instruments Texas Instruments Texas Instruments Texas Instruments Texas Instruments
Product Status Discontinued at Digi-Key Discontinued at Digi-Key Discontinued at Digi-Key Discontinued at Digi-Key Discontinued at Digi-Key
Output Type 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-Down, Step-Up/Step-Down Step-Up, Step-Down, Step-Up/Step-Down
Output Configuration Positive Positive Positive, Isolation Capable Positive, Isolation Capable Positive, Isolation Capable
Topology Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull Boost, Buck, Buck-Boost, Flyback, Forward Boost, Buck, Flyback, Forward Boost, Buck, Flyback, Forward
Number of Outputs 2 2 1 1 1
Output Phases 1 1 1 1 1
Voltage - Supply (Vcc/Vdd) 6.95V ~ 40V 7V ~ 40V 12V ~ 28V 12V ~ 28V 12V ~ 28V
Frequency - Switching 500kHz 200kHz Up to 500kHz Up to 500kHz Up to 500kHz
Duty Cycle (Max) 50% 47% 97% 48% 48%
Synchronous Rectifier Yes Yes No No No
Clock Sync Yes Yes No No No
Serial Interfaces - - - - -
Control Features Current Limit, Enable, Frequency Control, Soft Start Enable, Frequency Control, Soft Start Frequency Control Frequency Control Frequency Control
Operating Temperature -40°C ~ 85°C (TA) -40°C ~ 85°C (TA) -40°C ~ 85°C (TA) -40°C ~ 85°C (TA) -40°C ~ 85°C (TA)
Mounting Type Through Hole Through Hole Through Hole Through Hole Through Hole
Package / Case 16-DIP (0.300", 7.62mm) 16-DIP (0.300", 7.62mm) 8-DIP (0.300", 7.62mm) 8-DIP (0.300", 7.62mm) 8-DIP (0.300", 7.62mm)
Supplier Device Package 16-PDIP 16-PDIP 8-PDIP 8-PDIP 8-PDIP

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