UCC38C40

Name: UCC38C40
Brand: TI
SKU: UCC38C40
Price: 0.24 USD

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Commercial, 20-V, low-power current-mode PWM controller, 7-V/6.6-V UVLO, 100% duty cycle

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Data sheet

document-pdfAcrobat UCCx8C4x BiCMOS Low-Power Current-Mode PWM Controller datasheet (Rev. I) PDF | HTML

UCC38C40

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Data sheet

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Product details

Vin (max) (V)

18

Operating temperature range (°C)

0 to 85

Control mode

Current

Topology

Boost, Buck, Flyback, Forward, SEPIC

Rating

Catalog

Features

Adjustable switching frequency, Current limiting, Dead time control, Error amplifier, Fixed frequency, Multi-topology, Programmable max duty cycle

Duty cycle (max) (%)

100

Vin (max) (V)

18

Operating temperature range (°C)

0 to 85

Control mode

Current

Topology

Boost, Buck, Flyback, Forward, SEPIC

Rating

Catalog

Features

Adjustable switching frequency, Current limiting, Dead time control, Error amplifier, Fixed frequency, Multi-topology, Programmable max duty cycle

Duty cycle (max) (%)

100

SOIC (D)

8

29.4 mm² 4.9 x 6

VSSOP (DGK)

8

14.7 mm² 3 x 4.9

Enhanced replacement for UCx84x and UCx84xA family with pin-to-pin compatibility
Operating frequency: 1MHz Maximum
50µA Startup Current, 100µA Maximum
Low operating current: 2.3mA (at fOSC = 52kHz)
Fast, cycle-by-cycle overcurrent limiting: 35ns
Peak driving current: ±1A. Rail-to-rail output:
- 25ns rise time
- 20ns fall time
±1% accurate 2.5V error amplifier reference
Trimmed oscillator discharge current
Undervoltage lockout protections
VSSOP-8 package minimizes board space

Enhanced replacement for UCx84x and UCx84xA family with pin-to-pin compatibility
Operating frequency: 1MHz Maximum
50µA Startup Current, 100µA Maximum
Low operating current: 2.3mA (at fOSC = 52kHz)
Fast, cycle-by-cycle overcurrent limiting: 35ns
Peak driving current: ±1A. Rail-to-rail output:
- 25ns rise time
- 20ns fall time
±1% accurate 2.5V error amplifier reference
Trimmed oscillator discharge current
Undervoltage lockout protections
VSSOP-8 package minimizes board space

The UCCx8C4x family are high-performance, current-mode PWM controllers. The UCCx8C4x is an enhanced BiCMOS version with pin-for-pin compatibility to the industry standard UCx84xA family and UCx84x family of PWM controllers. The BiCMOS technology offers lower power consumption to improve efficiency as well as faster current sense and oscillator frequency.

In addition, lower startup voltage versions of 7V are offered as UCCx8C40 and UCCx8C41 for use in battery systems. The UCC28C4x series is specified for operation from –40°C to 125°C, and the UCC38C4x series is specified for operation from 0°C to 85°C.

Providing necessary features to control fixed frequency, peak current-mode power supplies, this family offers the following performance advantages. The device offers high-frequency operation up to 1MHz, suitable for high speed applications. The trimmed discharge current enables more precise programming of the maximum duty cycle and dead-time limit when compared to the UCCx8C4x family. Reduced start-up and operating currents minimizes start-up loss and low operating power consumption for improved efficiency. The device also features a fast current-sense-to-output delay time of 35ns for superior overload protection at the power switch, and a ±1A peak output current capability with improved rise and fall times for driving large external MOSFETs directly.

The UCCx8C4x family is offered in 8-pin VSSOP (DGK) and 8-pin SOIC (D) packages.

The UCCx8C4x family are high-performance, current-mode PWM controllers. The UCCx8C4x is an enhanced BiCMOS version with pin-for-pin compatibility to the industry standard UCx84xA family and UCx84x family of PWM controllers. The BiCMOS technology offers lower power consumption to improve efficiency as well as faster current sense and oscillator frequency.

In addition, lower startup voltage versions of 7V are offered as UCCx8C40 and UCCx8C41 for use in battery systems. The UCC28C4x series is specified for operation from –40°C to 125°C, and the UCC38C4x series is specified for operation from 0°C to 85°C.

Providing necessary features to control fixed frequency, peak current-mode power supplies, this family offers the following performance advantages. The device offers high-frequency operation up to 1MHz, suitable for high speed applications. The trimmed discharge current enables more precise programming of the maximum duty cycle and dead-time limit when compared to the UCCx8C4x family. Reduced start-up and operating currents minimizes start-up loss and low operating power consumption for improved efficiency. The device also features a fast current-sense-to-output delay time of 35ns for superior overload protection at the power switch, and a ±1A peak output current capability with improved rise and fall times for driving large external MOSFETs directly.

The UCCx8C4x family is offered in 8-pin VSSOP (DGK) and 8-pin SOIC (D) packages.

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UCC28C40

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Industrial, 20-V, low-power current-mode PWM controller, 7-V/6.6-V UVLO, 100% duty cycle Wider temperature range

Technical documentation

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	Type	Title		Date
*	Data sheet	UCCx8C4x BiCMOS Low-Power Current-Mode PWM Controller datasheet (Rev. I)	PDF \| HTML	13 Jun 2024
	Functional safety information	UCCx8C4x Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA	PDF \| HTML	12 Sep 2022
	Application note	Conditioning a Switch-mode Power Supply Current Signal Using TI Op Amps (Rev. A)	PDF \| HTML	11 Jun 2021
	Application note	Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B)		12 Mar 2019
	Selection guide	Power Management Guide 2018 (Rev. R)		25 Jun 2018
	Application note	UCC38C44 12-V Isolated Bias Supply (Rev. A)		09 Oct 2008
	User guide	UCC38C42 30-W Synchronous Buck Converter Reference Design		04 Feb 2003
	Application note	UCC38C42 25-W Forward Converter		06 Sep 2002
	Application note	UCC38C42 Family of High-Speed BiCMOS Current-Mode PWM Controllers		07 Feb 2002
	More literature	Seminar 300 Topic 8 - Switching Power Supply Design Review		15 Feb 2001
	More literature	Seminar 400 Topic 2 - Design of Flyback Transformers and Filter Inductors		15 Feb 2001
	More literature	Seminar 900 Topic 6 - High Power Factor Prereg Using SEPIC		15 Feb 2001
	Application note	DN-30 Programmable Electronic Circuit Breaker		05 Sep 1999
	Application note	DN-42A Design Considerations for Transitioning from UC3842 to the New UCC3802		05 Sep 1999
	Application note	U-111, Practical Considerations in Current Mode Power Supplies		05 Sep 1999

Design & development

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Evaluation board

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The UCC28C56EVM-066 is a highly efficient primary-side controlled (with AUX winding) flyback auxiliary power supply for EV and HEV automotive power trains. The design provides 15.2-V_TYP, 40-W output for 800-V battery systems. It will deliver 40 W over the input voltage range from 125 V to 1000 V. (...)

User guide: PDF | HTML