UCC2891DR

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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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UCC2891DR

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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Description Specifications Series Pricing CAD Documents

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.

Technical Specifications

Parameters and characteristics for this part

Specification	UCC2891DR

Clock Sync	Yes
Control Features	Current Limit, Ramp, On Time Control, Enable, Soft Start
Duty Cycle (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 Length	0.154 in
Package Name	16-SOIC
Package Width	3.9 mm
Synchronous Rectifier	No
Topology	Forward Converter, Flyback
Voltage - Supply (Vcc/Vdd) Maximum	16 V
Voltage - Supply (Vcc/Vdd) Minimum	8.5 V

UCC2891 Series

Part	Package Name	Topology	Function	Operating Temperature (Max)	Operating Temperature (Min)	Synchronous Rectifier	Output Type	Output Configuration	Clock Sync	Voltage - Supply (Vcc/Vdd) Minimum	Voltage - Supply (Vcc/Vdd) Maximum	Duty Cycle (Max)	Control Features	Number of Outputs	Frequency - Switching	Output Phases	Package Width	Package Length	Mounting Type	Total Output Count	Non-Isolated Output Count	Board Type	Supplied Contents	Voltage - Input (Minimum)	Voltage - Input (Maximum)	Regulator Topology	Utilized IC / Part	Voltage - Output	Current - Output	Main Purpose	Contents
Texas Instruments UCC2891DG4	16-SOIC	Flyback Forward Converter	Step-Down Step-Up	85 °C	-40 °C	No	Transistor Driver	Isolation Capable Positive	Yes	8.5 V	16 V	70 %	Current Limit Enable On Time Control Ramp Soft Start	1	250 kHz	1	3.9 mm	0.154 in	Surface Mount
Texas Instruments UCC2891DRG4	16-SOIC	Flyback Forward Converter	Step-Down Step-Up	85 °C	-40 °C	No	Transistor Driver	Isolation Capable Positive	Yes	8.5 V	16 V	70 %	Current Limit Enable On Time Control Ramp Soft Start	1	250 kHz	1	3.9 mm	0.154 in	Surface Mount
Texas Instruments UCC2891PWR	16-TSSOP	Flyback Forward Converter	Step-Down Step-Up	85 °C	-40 °C	No	Transistor Driver	Isolation Capable Positive	Yes	8.5 V	16 V	70 %	Current Limit Enable On Time Control Ramp Soft Start	1	250 kHz	1	4.4 mm	0.173 in	Surface Mount
Texas Instruments UCC2891DR	16-SOIC	Flyback Forward Converter	Step-Down Step-Up	85 °C	-40 °C	No	Transistor Driver	Isolation Capable Positive	Yes	8.5 V	16 V	70 %	Current Limit Enable On Time Control Ramp Soft Start	1	250 kHz	1	3.9 mm	0.154 in	Surface Mount
Texas Instruments UCC2891EVM-520							Non-Isolated								250 kHz					1	1 count	Fully Populated	Board(s)	36 V	75 V	Forward Converter	UCC2891	3.3 V	30 A	DC/DC Step Down	Board
Texas Instruments UCC2891PW	16-TSSOP	Flyback Forward Converter	Step-Down Step-Up	85 °C	-40 °C	No	Transistor Driver	Isolation Capable Positive	Yes	8.5 V	16 V	70 %	Current Limit Enable On Time Control Ramp Soft Start	1	250 kHz	1	4.4 mm	0.173 in	Surface Mount
Texas Instruments UCC2891D	16-SOIC	Flyback Forward Converter	Step-Down Step-Up	85 °C	-40 °C	No	Transistor Driver	Isolation Capable Positive	Yes	8.5 V	16 V	70 %	Current Limit Enable On Time Control Ramp Soft Start	1	250 kHz	1	3.9 mm	0.154 in	Surface Mount