UCC3581D

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Texas Instruments

15V, 1A MICROPOWER VOLTAGE MODE PWM CONTROLLER, 0C TO 70C

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UCC3581D

Active

Texas Instruments

15V, 1A MICROPOWER VOLTAGE MODE PWM CONTROLLER, 0C TO 70C

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Description Specifications Series Pricing CAD Documents

Description

General part information

UCC3581 Series

The UCC3581 voltage mode pulse width modulator is designed to control low power isolated DC - DC converters in applications such as Subscriber Line Power (ISDN I.430). Primarily used for single switch forward and flyback converters, the UCC3581 features BiCMOS circuitry for low startup and operating current, while maintaining the ability to drive power MOSFETs at frequencies up to 100kHz. The UCC3581 oscillator allows the flexibility to program both the frequency and the maximum duty cycle with two resistors and a capacitor. A TTL level input is also provided to allow synchronization to an external frequency source.

The UCC3581 includes programmable soft start circuitry, overcurrent detection, a 7.5V linear preregulator to control chip VDD during startup, and an on-board 4.0V logic supply.

The UCC3581 provides functions to maximize light load efficiency that are not normally found in PWM controllers.

Technical Specifications

Parameters and characteristics for this part

Specification	UCC3581D

Clock Sync	Yes
Control Features	Soft Start, Enable, Frequency Control, Current Limit
Duty Cycle (Max)	84 %
Frequency - Switching (Max)	100 kHz
Function	Step-Up/Step-Down, Step-Down, Step-Up
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature (Max)	70 °C
Operating Temperature (Min)	0 °C
Output Configuration	Positive, Isolation Capable
Output Phases	1
Output Type	Transistor Driver
Package Length	0.154 in
Package Name	14-SOIC
Package Width	3.9 mm
Synchronous Rectifier	No
Topology	Boost, Forward Converter, Flyback, Buck
Voltage - Supply (Vcc/Vdd) Maximum	15 V
Voltage - Supply (Vcc/Vdd) Minimum	6.8 V

UCC3581 Series

Part	Number of Outputs	Output Type	Voltage - Supply (Vcc/Vdd) Maximum	Voltage - Supply (Vcc/Vdd) Minimum	Synchronous Rectifier	Package Width	Package Name	Package Length	Output Phases	Clock Sync	Output Configuration	Control Features	Function	Frequency - Switching (Max)	Duty Cycle (Max)	Topology	Mounting Type	Operating Temperature (Max)
Texas Instruments UCC3581D	1	Transistor Driver	15 V	6.8 V	No	3.9 mm	14-SOIC	0.154 in	1	Yes	Isolation Capable Positive	Current Limit Enable Frequency Control Soft Start	Step-Down Step-Up Step-Up/Step-Down	100 kHz	84 %	Boost Buck Flyback Forward Converter	Surface Mount	70 °C
Texas Instruments UCC3581DTR	1	Transistor Driver	15 V	6.8 V	No	3.9 mm	14-SOIC	0.154 in	1	Yes	Isolation Capable Positive	Current Limit Enable Frequency Control Soft Start	Step-Down Step-Up Step-Up/Step-Down	100 kHz	84 %	Boost Buck Flyback Forward Converter	Surface Mount	70 °C
Texas Instruments UCC3581N	1	Transistor Driver	15 V	6.8 V	No	7.62 mm	14-DIP 14-PDIP	0.3 in	1	Yes	Isolation Capable Positive	Current Limit Enable Frequency Control Soft Start	Step-Down Step-Up Step-Up/Step-Down	100 kHz	84 %	Boost Buck Flyback Forward Converter	Through Hole	70 °C

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

MicroPower Voltage Mode PWM datasheet (Rev. B)