UCC38C43

ACTIVE

20V, 1-A, Low current 1MHz current mode PWM controller with 8.4V/7.6V UVLO 100% duty cycle 0C to 70C

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Product details

Parameters

Topology Boost, Buck, Buck-Boost, Flyback, Forward Control method Peak Current Mode VCC (Min) (V) 8.4 VCC (Max) (V) 18 Duty cycle (Max) (%) 100 UVLO thresholds on/off (V) 8.4/7.6 Frequency (Max) (kHz) 1000 Operating temperature range (C) 0 to 70 Gate drive (Typ) (A) 1 Features Adjustable Switching Frequency, Current Limiting, Dead Time Control, Error Amplifier, Multi-topology, Programmable Max Duty Cycle Rating Catalog open-in-new Find other PWM controllers & resonant controllers

Package | Pins | Size

PDIP (P) 8 93 mm² 9.81 x 9.43 SOIC (D) 8 19 mm² 3.91 x 4.9 VSSOP (DGK) 8 15 mm² 3 x 4.9 open-in-new Find other PWM controllers & resonant controllers

Features

  • Enhanced Replacement for UCx84x and UCx84xA Family With Pin-to-Pin Compatibility
  • 1-MHz Operation
  • 50-µA Standby Current, 100-µA Maximum
  • Low Operating Current of 2.3 mA at 52 kHz
  • Fast 35-ns Cycle-by-Cycle Over-Current Limiting
  • ±1-A Peak Output Current
  • Rail-to-Rail Output Swings with 25-ns Rise and 20-ns Fall Times
  • ±1% Initial Trimmed 2.5-V Error Amplifier Reference
  • Trimmed Oscillator Discharge Current
  • New Undervoltage Lockout Versions
  • VSSOP-8 Package Minimizes Board Space
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Description

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 7 V are offered as UCCx8C40 and UCCx8C41 for use in battery systems. The UCC28C4x series is specified for operation from –40°C to 105°C, and the UCC38C4x series is specified for operation from 0°C to 70°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 1 MHz, 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 UCx84x 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 35 ns for superior overload protection at the power switch, and a ±1-A peak output current capability with improved rise and fall times for driving large external MOSFETs directly.

The UCC38C4x family is offered in 8-pin VSSOP (DGK), 8-pin SOIC (D), and 8-pin PDIP (P) packages.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 14
Type Title Date
* Datasheet UCCx8C4x BiCMOS Low-Power Current-Mode PWM Controller datasheet (Rev. G) Jan. 10, 2017
Application note Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) Mar. 12, 2019
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Application note UCC38C44 12-V Isolated Bias Supply (Rev. A) Oct. 09, 2008
User guide UCC38C42 30-W Synchronous Buck Converter Reference Design Feb. 04, 2003
Application note UCC38C42 25-W Forward Converter Sep. 06, 2002
Application note UCC38C42 Family of High-Speed BiCMOS Current-Mode PWM Controllers Feb. 07, 2002
More literature Seminar 300 Topic 8 - Switching Power Supply Design Review Feb. 15, 2001
More literature Seminar 400 Topic 2 - Design of Flyback Transformers and Filter Inductors Feb. 15, 2001
More literature Seminar 900 Topic 6 - High Power Factor Prereg Using SEPIC Feb. 15, 2001
Application note Conditioning a Switch-mode Power Supply Current Signal Using TI Op Amps Mar. 23, 2000
Application note DN-30 Programmable Electronic Circuit Breaker Sep. 05, 1999
Application note DN-42A Design Considerations for Transitioning from UC3842 to the New UCC3802 Sep. 05, 1999
Application note U-111, Practical Considerations in Current Mode Power Supplies Sep. 05, 1999

Design & development

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

Design tools & simulation

SIMULATION MODEL Download
SLUM033.ZIP (101 KB) - PSpice Model
SIMULATION MODEL Download
SLUM176.TSC (204 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SLUM177.TSC (182 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SLUM178.ZIP (10 KB) - TINA-TI Spice Model
SIMULATION MODEL Download
SLUM179.ZIP (10 KB) - TINA-TI Spice Model
SIMULATION MODEL Download
SLUM521.ZIP (4 KB) - PSpice Model

Reference designs

REFERENCE DESIGNS Download
85-265Vin, 5Vout, 1Aout, AC-DC Fly-Buck Converter Reference Design
PMP10834 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 (...)
document-generic Schematic

CAD/CAE symbols

Package Pins Download
PDIP (P) 8 View options
SOIC (D) 8 View options
VSSOP (DGK) 8 View options

Ordering & quality

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