UCC2891

ACTIVE

110-V active clamp current mode PWM controller with P-channel clamp FET and 0.75V CS threshold

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Data sheet

document-pdfAcrobat UCC289x Current Mode Active Clamp PWM Controller datasheet (Rev. F)

UCC2891

ACTIVE

Data sheet

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Product details

Vin (max) (V)

16

Operating temperature range (°C)

-40 to 85

Control mode

Current

Topology

Active-clamp forward, Flyback, Forward

Rating

Catalog

Features

High-voltage startup, Input line monitor, Multi-topology, Programmable slope compensation, Soft start, Soft switching, Supports NFET clamp

Duty cycle (max) (%)

100

Vin (max) (V)

16

Operating temperature range (°C)

-40 to 85

Control mode

Current

Topology

Active-clamp forward, Flyback, Forward

Rating

Catalog

Features

High-voltage startup, Input line monitor, Multi-topology, Programmable slope compensation, Soft start, Soft switching, Supports NFET clamp

Duty cycle (max) (%)

100

SOIC (D)

16

59.4 mm² 9.9 x 6

TSSOP (PW)

16

32 mm² 5 x 6.4

Low Output Jitter
Soft-Stop Shutdown of MAIN and AUX
Ideal for Active Clamp/Reset Forward, Flyback Converters
Provides Complementary Auxiliary Driver with Programmable Deadtime (Turn-On Delay) between AUX and MAIN Switches
Peak Current-Mode Control with Cycle-by-Cycle Current Limiting
110-V Input Startup Regulator on UCC2891/3
TrueDrive™ 2-A Sink, 2-A Source Outputs
Accurate Line UV and Line OV Threshold
Programmable Slope Compensation
1.0-MHz Synchronizable Oscillator
Precise Programmable Maximum Duty Cycle
Programmable Soft Start
APPLICATIONS
- 150-W to 700-W SMPS
- High-Efficiency, Low EMI/RFI Off-Line or DC/DC Converters
- Server, 48-V Telecom, Datacom
- High Power Adapter, LCD-TV and PDP-TV

Low Output Jitter
Soft-Stop Shutdown of MAIN and AUX
Ideal for Active Clamp/Reset Forward, Flyback Converters
Provides Complementary Auxiliary Driver with Programmable Deadtime (Turn-On Delay) between AUX and MAIN Switches
Peak Current-Mode Control with Cycle-by-Cycle Current Limiting
110-V Input Startup Regulator on UCC2891/3
TrueDrive™ 2-A Sink, 2-A Source Outputs
Accurate Line UV and Line OV Threshold
Programmable Slope Compensation
1.0-MHz Synchronizable Oscillator
Precise Programmable Maximum Duty Cycle
Programmable Soft Start
APPLICATIONS
- 150-W to 700-W SMPS
- High-Efficiency, Low EMI/RFI Off-Line or DC/DC Converters
- Server, 48-V Telecom, Datacom
- High Power Adapter, LCD-TV and PDP-TV

The UCC2891/2/3/4 family of PWM controllers is designed to simplify implementation of the various active clamp/reset switching power topologies.

The UCC289x is a peak current-mode, fixedfrequency, high-performance pulse width modulator. It includes the logic and the drive capability for the auxiliary switch with a simple method of programming the critical delays for proper active clamp operation.

The UCC2891/3 includes a 110-V start-up regulator for initial start-up and to provide keep-alive power during stand-by.

Additional features include an internal programmable slope compensation circuit, precise D_MAX limit, and a single resistor programmable synchronizable oscillator. An accurate line monitoring function also programs the converter\x92s ON and OFF transitions with regard to the bulk input voltage. Along with the UCC2897, this UCC289x family allows the power supply designer to eliminate many of the external components, reducing the size and complexity of the design.

The UCC2891/2/3/4 family of PWM controllers is designed to simplify implementation of the various active clamp/reset switching power topologies.

The UCC289x is a peak current-mode, fixedfrequency, high-performance pulse width modulator. It includes the logic and the drive capability for the auxiliary switch with a simple method of programming the critical delays for proper active clamp operation.

The UCC2891/3 includes a 110-V start-up regulator for initial start-up and to provide keep-alive power during stand-by.

Additional features include an internal programmable slope compensation circuit, precise D_MAX limit, and a single resistor programmable synchronizable oscillator. An accurate line monitoring function also programs the converter\x92s ON and OFF transitions with regard to the bulk input voltage. Along with the UCC2897, this UCC289x family allows the power supply designer to eliminate many of the external components, reducing the size and complexity of the design.

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UCC2897A

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110-V active clamp current mode PWM controller with P-channel clamp FET and line OV protection Supports active clamp topology

Technical documentation

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	Type	Title	Date
*	Data sheet	UCC289x Current Mode Active Clamp PWM Controller datasheet (Rev. F)	01 Jul 2009
	Application note	Understanding and Designing an Active Clamp Current Mode Controlled Converter (Rev. A)	27 Jan 2020
	Selection guide	Power Management Guide 2018 (Rev. R)	25 Jun 2018
	Analog Design Journal	1Q 2013Issue Analog Applications Journal	22 Jan 2013
	Analog Design Journal	Design of a 60-A interleaved active-clamp forward converter	22 Jan 2013
	User guide	48-V to 3.3-V Forward Converter w/Active Clamp Reset Using the UCC2891 Active Cl (Rev. A)	13 Apr 2012
	Application note	Method of Providing Hiccup Operation for UCC2897AEVM	27 Aug 2009
	User guide	48-V to 3.3-V Forward Converter w/Active Clamp Reset (Rev. A)	12 Dec 2006
	Application note	Active Clamp Transformer Reset: High Side or Low Side?	17 Sep 2004
	Application note	UCC2891 Active Clamp	22 Dec 2003
	More literature	Seminar 1000 Topic 3 - Active Clamp and Reset Technique	15 Feb 2001
	More literature	Seminar 1100 Topic 3 - Design Considerations for Active Clamp and Reset	15 Feb 2001

Design & development

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Evaluation board

UCC2891EVM-520 — Evaluation Module for UCC2891 Current Mode Active Clamp PWM Controller

The UCC2891EVM evaluation module (EVM) is a forward converter providing a 3.3V regulated output at 30A of load current, operating from a 48V input. The EVM operates over the full 36V to 75V telecom input range, and is able to fully regulate down to zero load current. The module uses the UCC2891 (...)

User guide: PDF