Home Power management AC/DC & DC/DC controllers (external FET)
Home
Power management
AC/DC & DC/DC controllers (external FET)

UCC38C42

ACTIVE

Commercial, 20-V, low-power current-mode PWM controller, 14.5-V/9-V UVLO, 100% duty cycle

Order now
Data sheet

UCC38C42

ACTIVE
Data sheet Order now

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.
filter Find other AC/DC & DC/DC controllers (external FET)
Download View video with transcript Video

Similar products you might be interested in

open-in-new Compare alternates
Drop-in replacement with upgraded functionality to the compared device
UCC28C42 ACTIVE Industrial, 20-V, low-power current-mode PWM controller, 14.5-V/9-V UVLO, 100% duty cycle Wider temperature range

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 17
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
User guide UCC3961/UCC38C43 Reference Design 19 Nov 2002
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 DN-62 Switching Power Supply Topology Voltage Mode vs. Current Mode 05 Sep 1999
Application note U-111, Practical Considerations in Current Mode Power Supplies 05 Sep 1999

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

UCC28C56EVM-066 — UCC28C56H-Q1 evaluation module for primary-side controlled (with AUX winding) flyback regulator

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-VTYP, 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
Not available on TI.com
Simulation model

UCC28C42 PSpice Transient Model

SLVM049.ZIP (101 KB) - PSpice Model
Download
Simulation model

UCC28C42 TINA-TI Transient Start-up Reference Design

SLVM045.TSC (70 KB) - TINA-TI Reference Design
Download
Simulation model

UCC28C42 TINA-TI Transient Start-up Spice Model

SLVM047.TSM (9 KB) - TINA-TI Spice Model
Download
Simulation model

UCC28C42 TINA-TI Transient Steady State Reference Design

SLVM046.TSC (70 KB) - TINA-TI Reference Design
Download
Simulation model

UCC28C42 TINA-TI Transient Steady State Spice Model

SLVM048.TSM (9 KB) - TINA-TI Spice Model
Download
Simulation model

UCCx8C42 Unencrypted PSpice Transient Model

SLUM522.ZIP (4 KB) - PSpice Model
Download
Reference designs

PMP30720 — High efficiency, ultra-wide input (20 VDC to 375 VDC) isolated power supply reference design

This reference design uses the UCC28C42 boost controller and the UCC28780 active-clamp flyback controller to generate an isolated output of 24 V at 3.5 A over an ultra-wide input voltage range of 20 V to 375 V. The design also uses the UCC24612 synchronous rectifier controller on the secondary (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP10783 — AC/DC Buck Converter with 85VAC - 318VAC Input and 15V at 0.8A Output Reference Design

The PMP10783 reference design is an AC/DC buck converter. The input voltage range is 85VAC-318VAC, and has an output of 15V at 0.80A. This compact board design has an efficiency of greater than 80% at full load.
Test report: PDF
Schematic: PDF
Reference designs

PMP10833 — 85-318Vin, 15Vout, 1Aout, AC-DC Buck Converter Reference Design

The PMP10833RevA reference design is a compact and thermally efficient design intended to step down a wide range of AC inputs.  This design incorporates the UCC28C42, a current-mode PWM controller, with controllable frequencies up to 1Mhz.
Test report: PDF
Schematic: PDF
Reference designs

PMP10834 — 85-265Vin, 5Vout, 1Aout, AC-DC Fly-Buck Converter Reference Design

The PMP10834RevA reference design is a compact and thermally efficient design intended to step down a wide range of AC inputs (85VAC to 265VAC). This non-isolated Flybuck design incorporates the UCC28C42 PWM with an optocoupler feedback to provide 1% output voltage regulation. All the circuit (...)
Test report: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
SOIC (D) 8 Ultra Librarian
VSSOP (DGK) 8 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos