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UCC2891DR The Texas Instruments UCC2891DR is a current mode PWM controller designed for active clamp/reset switching power topologies. It operates with an input voltage range of 8.5V to 16V and a maximum duty cycle of 70%.
Mfr Part #:

UCC2891DR

Available from 3 distributors
Mfr Name: Texas Instruments
Texas Instruments
The Texas Instruments UCC2891DR is a current mode PWM controller designed for active clamp/reset switching power topologies. It operates with an input voltage range of 8.5V to 16V and a maximum duty cycle of 70%.
✓ Total Stock: 10,261 pcs
$ Price Range: $0.78

UCC2891DR Available from 3 distributors

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✓ Non-Authorised
Distributor Stock Pricing MOQ PKG Lead Time Date Code On Order Quantity On Order Delivery
PROSOFT ELECTRONICS ✓
Non-Authorised Inventory information
5,000 pcs
On Request
5000 pcs On Request 1 On Request On Request 17+20+22+ On Request On Request
Smaxon Electronics ✓
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3,427 pcs
On Request
3427 pcs On Request 1 On Request On Request 1119+5 On Request On Request
Xingangxin ✓
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1,834 pcs
On Request
1834 pcs On Request 1 On Request On Request On Request On Request On Request
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UCC2891DR Specifications Quick View

Most important parameters for selection – full specs in datasheet.
Category
Manufacturer Name
Clock Sync
Control Features
Duty Cycle (Max)
Frequency
Function
Mounting Type
Number of Outputs
Operating Temperature
Output Configuration
Output Phases
Output Type
Shutdown
Supplier Device Package
Supplier Package
Synchronous Rectifier
Topology
Voltage
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UCC2891DR Description

Short technical summary and product information.

The Texas Instruments UCC2891DR is a high-performance, fixed-frequency, peak current-mode pulse width modulator designed to simplify the implementation of active clamp/reset switching power topologies such as active clamp/reset forward and flyback converters. It operates within an input voltage range of 8.5V to 16V and features a maximum duty cycle of 70% at a frequency of 250kHz.

 

Key features include a 110-V input startup regulator for initial power-up and standby, low output jitter, and soft-stop shutdown capabilities for both main and auxiliary switches. The device provides a complementary auxiliary driver with programmable deadtime control, ensuring proper active clamp operation. It also incorporates cycle-by-cycle current limiting, accurate line UV and OV thresholds, programmable slope compensation, and a synchronizable oscillator.

 

This controller is suitable for applications ranging from 150-W to 700-W SMPS, including high-efficiency, low EMI/RFI off-line or DC/DC converters for servers, 48-V telecom, datacom, high power adapters, and LCD-TVs. The UCC2891DR is available in a 16-SOIC package and is designed for surface mount applications.

 

The UCC2891DR offers precise programmable maximum duty cycle and programmable soft start features, contributing to efficient and stable power supply designs. Its TrueDrive outputs provide 2-A sink and 2-A source capabilities.

UCC2891DR Quick Information

Product Type: DC DC Switching Controller
Canonical Name: UCC2891DR Current Mode Active Clamp PWM Controller
Subcategory: Current Mode

UCC2891DR Compliance

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

UCC2891DR Estimated Pricing

Qty Low High
1+ $0.78 $0.78

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

UCC2891DR Features

  • Peak current-mode PWM controller.
  • Supports active clamp/reset topologies.
  • Programmable soft start and deadtime.
  • 110-V input startup regulator included.
  • 2-A sink, 2-A source outputs.

UCC2891DR Applications

  • Ideal for active clamp/reset forward converters.
  • Suitable for flyback converter designs.
  • Used in high-efficiency SMPS.
  • Applications in telecom and datacom.
  • High power adapter designs.

UCC2891DR FAQs

7 frequently asked questions generated from this part’s specifications.
What is the input voltage range for the UCC2891DR?

The input voltage range for the UCC2891DR is 8.5 V to 16 V.

What is the maximum operating temperature for the UCC2891DR?

The maximum operating temperature for the UCC2891DR is 85°C.

What is the maximum duty cycle of the UCC2891DR?

The maximum duty cycle for the UCC2891DR is 70%.

What is the operating frequency of the UCC2891DR?

The operating frequency of the UCC2891DR is 250 kHz.

What type of package is the UCC2891DR in?

The UCC2891DR is available in a 16-SOIC package.

Does the UCC2891DR have a startup regulator?

Yes, the UCC2891DR includes a 110-V input startup regulator.

What are the output current capabilities of the UCC2891DR?

The UCC2891DR features TrueDrive outputs with 2-A sink and 2-A source capabilities.

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