UCC2891PWR

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Texas Instruments

110-V ACTIVE CLAMP CURRENT MODE PWM CONTROLLER WITH P-CHANNEL CLAMP FET AND 0.75V CS THRESHOLD

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DocumentsDatasheet Method of Providing Hiccup Operation for UCC2897AEVM +9

UCC2891PWR

Active

Texas Instruments

110-V ACTIVE CLAMP CURRENT MODE PWM CONTROLLER WITH P-CHANNEL CLAMP FET AND 0.75V CS THRESHOLD

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DocumentsDatasheet Method of Providing Hiccup Operation for UCC2897AEVM +9

Specifications Pricing Series Description Documents

Technical Specifications

Parameters and characteristics for this part

Specification	UCC2891PWR

Clock Sync	True
Control Features	Ramp, Soft Start, On Time Control, Enable, Current Limit
Duty Cycle (Max) [Max]	70 %
Frequency - Switching	250 kHz
Function	Step-Up/Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature [Max]	85 °C
Operating Temperature [Min]	-40 °C
Output Configuration	Positive, Isolation Capable
Output Phases	1
Output Type	Transistor Driver
Package / Case	16-TSSOP
Package / Case [x]	0.173 in
Package / Case [y]	4.4 mm
Supplier Device Package	16-TSSOP
Synchronous Rectifier	False
Topology	Forward Converter, Flyback
Voltage - Supply (Vcc/Vdd) [Max]	16 V
Voltage - Supply (Vcc/Vdd) [Min]	8.5 V

UCC2891 Series

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

Part	Topology	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Mounting Type	Output Configuration	Duty Cycle (Max) [Max]	Supplier Device Package	Function	Output Type	Control Features	Operating Temperature [Max]	Operating Temperature [Min]	Output Phases	Number of Outputs	Frequency - Switching	Package / Case	Package / Case [x]	Package / Case [y]	Voltage - Output	Current - Output	Main Purpose	Supplied Contents	Voltage - Input [Max]	Voltage - Input [Min]	Utilized IC / Part	Outputs and Type	Outputs and Type	Board Type	Regulator Topology
Texas Instruments UCC2891DG4	Flyback Forward Converter	8.5 V	16 V	Surface Mount	Isolation Capable Positive	70 %	16-SOIC	Step-Up/Step-Down	Transistor Driver	Current Limit Enable On Time Control Ramp Soft Start	85 °C	-40 °C	1	1	250 kHz	16-SOIC	0.154 in	3.9 mm
Texas Instruments UCC2891PWR	Flyback Forward Converter	8.5 V	16 V	Surface Mount	Isolation Capable Positive	70 %	16-TSSOP	Step-Up/Step-Down	Transistor Driver	Current Limit Enable On Time Control Ramp Soft Start	85 °C	-40 °C	1	1	250 kHz	16-TSSOP	0.173 in	4.4 mm
Texas Instruments UCC2891DR	Flyback Forward Converter	8.5 V	16 V	Surface Mount	Isolation Capable Positive	70 %	16-SOIC	Step-Up/Step-Down	Transistor Driver	Current Limit Enable On Time Control Ramp Soft Start	85 °C	-40 °C	1	1	250 kHz	16-SOIC	0.154 in	3.9 mm
Texas Instruments UCC2891EVM-520															250 kHz				3.3 V	30 A	DC/DC Step Down	Board(s)	75 V	36 V	UCC2891	Non-Isolated	1	Fully Populated	Forward Converter
Texas Instruments UCC2891PW	Flyback Forward Converter	8.5 V	16 V	Surface Mount	Isolation Capable Positive	70 %	16-TSSOP	Step-Up/Step-Down	Transistor Driver	Current Limit Enable On Time Control Ramp Soft Start	85 °C	-40 °C	1	1	250 kHz	16-TSSOP	0.173 in	4.4 mm
Texas Instruments UCC2891D	Flyback Forward Converter	8.5 V	16 V	Surface Mount	Isolation Capable Positive	70 %	16-SOIC	Step-Up/Step-Down	Transistor Driver	Current Limit Enable On Time Control Ramp Soft Start	85 °C	-40 °C	1	1	250 kHz	16-SOIC	0.154 in	3.9 mm

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Cut Tape (CT)	1	$ 2.72
		10	$ 2.44
		25	$ 2.31
		100	$ 2.00
		250	$ 1.90
		500	$ 1.70
		1000	$ 1.44
	Digi-Reel®	1	$ 2.72
		10	$ 2.44
		25	$ 2.31
		100	$ 2.00
		250	$ 1.90
		500	$ 1.70
		1000	$ 1.44
	Tape & Reel (TR)	2000	$ 1.36
		6000	$ 1.31
Texas Instruments	LARGE T&R	1	$ 2.36
		100	$ 2.07
		250	$ 1.45
		1000	$ 1.17

Description

General part information

UCC2891 Series

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.

Documents

Technical documentation and resources

Datasheet

Method of Providing Hiccup Operation for UCC2897AEVM

Application note

48-V to 3.3-V Forward Converter w/Active Clamp Reset Using the UCC2891 Active Cl (Rev. A)

User guide

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

Data sheet

Understanding and Designing an Active Clamp Current Mode Controlled Converter (Rev. A)

Application note

UCC2891PWR

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UCC2891PWR

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Technical Specifications

UCC2891 Series

Pricing

Description

UCC2891 Series

Documents

Datasheet

Method of Providing Hiccup Operation for UCC2897AEVM

48-V to 3.3-V Forward Converter w/Active Clamp Reset Using the UCC2891 Active Cl (Rev. A)

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

Understanding and Designing an Active Clamp Current Mode Controlled Converter (Rev. A)

Power Management Guide 2018 (Rev. R)

UCC2891 Active Clamp

1Q 2013Issue Analog Applications Journal

Active Clamp Transformer Reset: High Side or Low Side?

Design of a 60-A interleaved active-clamp forward converter

48-V to 3.3-V Forward Converter w/Active Clamp Reset (Rev. A)

UCC2891 Series