UC3875N The Texas Instruments UC3875N is an AC/DC controller IC featuring a phase-shifted full bridge topology. It offers adjustable switching frequency and soft start capabilities.
Mfr Part #:

UC3875N

Available from 4 distributors
Mfr Name: Texas Instruments
Texas Instruments
The Texas Instruments UC3875N is an AC/DC controller IC featuring a phase-shifted full bridge topology. It offers adjustable switching frequency and soft start capabilities.
✓ Total Stock: 7,407 pcs
$ Price Range: $10.88

UC3875N Available from 4 distributors

✓ Authorised
✓ Non-Authorised

UC3875N Specifications Quick View

Most important parameters for selection – full specs in datasheet.
Category
Manufacturer Name
Control Features
Duty Cycle
Fault Protection
Features
Frequency
Mounting Type
Operating Temperature
Output Isolation
Supplier Device Package
Topology
Voltage

UC3875N Description

Short technical summary and product information.

The UC3875N from Texas Instruments is an integrated circuit designed for controlling a bridge power stage using phase-shifting techniques. This allows for constant frequency pulse-width modulation combined with resonant, zero-voltage switching for high efficiency at high frequencies.

 

Key features include an adjustable switching frequency up to 1MHz, an error amplifier, soft start, soft switching, and a synchronization pin. The device operates with a voltage range of 9.5V to 20V and has an operating temperature range of 0°C to 70°C. It supports zero to 100% duty cycle control and offers programmable output turn-on delay.

 

This controller is compatible with both voltage and current mode topologies and provides essential fault protection through current limiting. It features four 2A totem pole outputs and a 10MHz error amplifier. Undervoltage lockout is included, with outputs active low during UVLO. The device also has a latched over-current comparator with full cycle restart and a trimmed reference.

 

The UC3875N is available in a 20-PDIP package and is designed for through-hole mounting.

UC3875N Quick Information

Product Type: AC DC Converter, Offline Switch
Canonical Name: UC3875N Phase Shift Resonant Controller
Subcategory: Offline Switching Regulators

UC3875N Compliance

RoHS Status: RoHS Compliant
Moisture Sensitivity Level (MSL): 1 Unlimited
REACH Status: REACH Unaffected

UC3875N Estimated Pricing

Qty Low High
1+ $10.88 $10.88

Estimated market price range - modelled values for guidance only, not live distributor offers.

UC3875N Features

  • Phase-shifted full bridge topology.
  • Adjustable switching frequency up to 1MHz.
  • Supports soft start and soft switching.
  • Four 2A totem pole outputs.
  • Undervoltage lockout protection.

UC3875N Applications

  • Ideal for phase-shifted full bridge converters.
  • Used in resonant zero-voltage switching power supplies.
  • Suitable for high-frequency offline AC-DC converters.
  • For high-efficiency zero-voltage switching designs.

UC3875N FAQs

7 frequently asked questions generated from this part’s specifications.
What is the operating temperature range for the UC3875N?

The operating temperature range for the UC3875N is 0°C to 70°C.

What type of package is the UC3875N available in?

The UC3875N is available in a 20-PDIP package.

What is the switching frequency of the UC3875N?

The UC3875N has an adjustable switching frequency up to 1MHz.

What is the operating voltage range for the UC3875N?

The operating voltage range for the UC3875N is 9.5V to 20V.

What control features does the UC3875N offer?

The UC3875N offers frequency control, soft start, and synchronization.

Does the UC3875N have undervoltage lockout?

Yes, the UC3875N features undervoltage lockout.

What is the duty cycle control for the UC3875N?

The UC3875N provides zero to 100% duty cycle control.

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