UC2875N
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Texas Instruments UC2875N

Manufacturer No:
UC2875N
Manufacturer:
Texas Instruments
Package:
Tube
Description:
IC OFFLINE SW FULL-BRDG 20DIP
Delivery:
Payment:
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Product Introduction

Overview

The UC2875N is a bipolar phase-shifted full-bridge controller integrated circuit produced by Texas Instruments. This device is designed to control a bridge power stage by phase-shifting the switching of one half-bridge with respect to the other, enabling constant frequency pulse-width modulation combined with resonant, zero-voltage switching for high efficiency performance at high frequencies. The UC2875N can operate in either voltage or current mode and includes features such as programmable time delays, soft-start control, and over-current protection. It is available in various packages, including 20-pin PDIP, 28-pin SOIC, and 28-lead PLCC, and operates over a temperature range of -25°C to 85°C.

Key Specifications

Parameter Description
Package PDIP-20, SOIC-28, PLCC-28
Pins 20 (PDIP), 28 (SOIC and PLCC)
Operating Temperature Range -25°C to 85°C
Maximum Operating Supply Voltage 20V
Maximum Operating Current 2A per output
Number of Outputs 4
Switching Frequency Up to 1MHz
Error Amplifier Bandwidth Exceeds 7MHz
Undervoltage Lockout (UVLO) 10.75V with 1.5V hysteresis

Key Features

  • Zero to 100% Duty Cycle Control
  • Programmable Output Turn-On Delay
  • Compatible with Voltage or Current Mode Topologies
  • Practical Operation at Switching Frequencies to 1MHz
  • Four 2A Totem Pole Outputs
  • 10MHz Error Amplifier
  • Undervoltage Lockout (UVLO) with 1.5V hysteresis
  • Low Startup Current (150µA)
  • Outputs Active Low During UVLO
  • Soft-Start Control
  • Latched Over-Current Comparator With Full Cycle Restart
  • Trimmed Reference and Flexible Ramp Generation and Slope Compensation Circuitry

Applications

The UC2875N is suitable for various power management applications, including:

  • High-efficiency DC-DC converters using resonant or zero-voltage switching techniques.
  • Bridge power stages in both voltage and current mode operations.
  • Applications requiring high-frequency switching and precise control over output stages.
  • Power supplies where soft-start, over-current protection, and undervoltage lockout are essential.

Q & A

  1. What is the primary function of the UC2875N?

    The UC2875N is a bipolar phase-shifted full-bridge controller designed to control a bridge power stage for high-efficiency power conversion.

  2. What are the available package types for the UC2875N?

    The UC2875N is available in 20-pin PDIP, 28-pin SOIC, and 28-lead PLCC packages.

  3. What is the operating temperature range of the UC2875N?

    The operating temperature range is -25°C to 85°C.

  4. What is the maximum switching frequency of the UC2875N?

    The UC2875N can operate at switching frequencies up to 1MHz.

  5. Does the UC2875N support both voltage and current mode operations?
  6. What protective features does the UC2875N include?

    The UC2875N includes undervoltage lockout, over-current protection with full-cycle restart, and soft-start control.

  7. How many outputs does the UC2875N have?

    The UC2875N has four 2A totem pole outputs.

  8. What is the bandwidth of the error amplifier in the UC2875N?

    The error amplifier bandwidth exceeds 7MHz.

  9. Can the UC2875N be synchronized with an external clock signal?
  10. What is the purpose of the programmable output turn-on delay in the UC2875N?

    The programmable output turn-on delay allows for the insertion of a dead-time at the turn-on of each output stage, which is crucial for resonant switching action.

  11. Is the UC2875N RoHS compliant?

Product Attributes

Output Isolation:Non-Isolated
Internal Switch(s):- 
Voltage - Breakdown:- 
Topology:Full-Bridge
Voltage - Start Up:10.75 V
Voltage - Supply (Vcc/Vdd):9.5V ~ 20V
Duty Cycle:100%
Frequency - Switching:1MHz
Power (Watts):- 
Fault Protection:Current Limiting
Control Features:Frequency Control, Soft Start, Sync
Operating Temperature:-25°C ~ 85°C (TA)
Package / Case:20-DIP (0.300", 7.62mm)
Supplier Device Package:20-PDIP
Mounting Type:Through Hole
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Similar Products

Part Number UC2875N UC3875N UC2879N UC2876N UC2865N
Manufacturer Texas Instruments Texas Instruments Texas Instruments Texas Instruments Unitrode
Product Status Active Active Active Obsolete Active
Output Isolation Non-Isolated Non-Isolated Non-Isolated Non-Isolated Non-Isolated
Internal Switch(s) - - - - Yes
Voltage - Breakdown - - - - -
Topology Full-Bridge Full-Bridge Full-Bridge Full-Bridge Full-Bridge, Half-Bridge, Push-Pull
Voltage - Start Up 10.75 V 10.75 V - 15.25 V 16.5 V
Voltage - Supply (Vcc/Vdd) 9.5V ~ 20V 9.5V ~ 20V 9.25V ~ 20V 9.5V ~ 20V 10.5V ~ 22V
Duty Cycle 100% 100% 50% 100% -
Frequency - Switching 1MHz 1MHz 300kHz 1MHz 10kHz ~ 1MHz
Power (Watts) - - - - -
Fault Protection Current Limiting Current Limiting Current Limiting Current Limiting -
Control Features Frequency Control, Soft Start, Sync Frequency Control, Soft Start, Sync Frequency Control, Soft Start, Sync Frequency Control, Soft Start, Sync Soft Start
Operating Temperature -25°C ~ 85°C (TA) 0°C ~ 70°C (TA) -40°C ~ 85°C (TA) -25°C ~ 85°C (TA) -25°C ~ 85°C (TA)
Package / Case 20-DIP (0.300", 7.62mm) 20-DIP (0.300", 7.62mm) 20-DIP (0.300", 7.62mm) 20-DIP (0.300", 7.62mm) 16-DIP (0.300", 7.62mm)
Supplier Device Package 20-PDIP 20-PDIP 20-PDIP 20-PDIP 16-PDIP
Mounting Type Through Hole Through Hole Through Hole Through Hole Through Hole

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