Specification	UCC2581D

Clock Sync	True
Control Features	Soft Start, Frequency Control, Current Limit, Enable
Duty Cycle (Max) [Max]	84 %
Frequency - Switching [Max]	100 kHz
Function	Step-Up/Step-Down, Step-Up
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature [Max]	85 C
Operating Temperature [Min]	-40 ¯C
Output Configuration	Isolation Capable, Positive
Output Phases	1
Output Type	Transistor Driver
Package / Case	3.9 mm, 0.154 in
Package / Case	14-SOIC
Synchronous Rectifier	False
Topology	Flyback, Boost, Forward Converter
Voltage - Supply (Vcc/Vdd) [Max]	15 V
Voltage - Supply (Vcc/Vdd) [Min]	6.8 V

UCC2581 Series

Part	Output Phases	Control Features	Output Configuration	Output Type	Mounting Type	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Package / Case	Package / Case	Frequency - Switching [Max]	Topology	Operating Temperature [Max]	Operating Temperature [Min]	Number of Outputs	Function	Duty Cycle (Max) [Max]
Texas Instruments UCC2581D	1	Current Limit Enable Frequency Control Soft Start	Isolation Capable Positive	Transistor Driver	Surface Mount	6.8 V	15 V	0.154 in 3.9 mm	14-SOIC	100 kHz	Boost Flyback Forward Converter	85 C	-40 ¯C	1	Step-Up Step-Up/Step-Down	84 %
Texas Instruments UCC2581DTRG4	1	Current Limit Enable Frequency Control Soft Start	Isolation Capable Positive	Transistor Driver	Surface Mount	6.8 V	15 V	0.154 in 3.9 mm	14-SOIC	100 kHz	Boost Flyback Forward Converter	85 C	-40 ¯C	1	Step-Up Step-Up/Step-Down	84 %
Texas Instruments UCC2581DTR	1	Current Limit Enable Frequency Control Soft Start	Isolation Capable Positive	Transistor Driver	Surface Mount	6.8 V	15 V	0.154 in 3.9 mm	14-SOIC	100 kHz	Boost Flyback Forward Converter	85 C	-40 ¯C	1	Step-Up Step-Up/Step-Down	84 %

Pricing

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

Distributor	Package	Quantity	$

Arrow	N/A	50	$ 3.10
		100	$ 2.95
Digikey	N/A	520	$ 5.77
	Tube	1	$ 5.08
		10	$ 4.57
		50	$ 4.32
		100	$ 3.74
		250	$ 3.55
		500	$ 3.18
		1000	$ 2.69
		2500	$ 2.55
Mouser	N/A	1	$ 7.05
		10	$ 5.25
		50	$ 4.89
		100	$ 4.30
		250	$ 4.08
		500	$ 3.66
		1000	$ 3.08
		2500	$ 2.93
Texas Instruments	TUBE	1	$ 4.41
		100	$ 3.87
		250	$ 2.71
		1000	$ 2.18

Description

General part information

UCC2581 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.

Documents

Technical documentation and resources

MicroPower Voltage Mode PWM datasheet (Rev. B)

Data sheet