UCC28C42

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20V, 1-A, BiCMOS Low current 8 pin PWM current mode controller

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Product details

Parameters

Topology Boost, Buck, Buck-Boost, Flyback, Forward Control method Peak Current Mode VCC (Min) (V) 14.5 VCC (Max) (V) 18 Duty cycle (Max) (%) 100 UVLO thresholds on/off (V) 14.5/9 Frequency (Max) (kHz) 1000 Operating temperature range (C) -40 to 105 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

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Type Title Date
* Datasheet UCCx8C4x BiCMOS Low-Power Current-Mode PWM Controller datasheet (Rev. G) Jan. 10, 2017
Application notes Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) Mar. 12, 2019
Selection guides Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Technical articles How to simplify high-voltage power-supply design Nov. 07, 2016
Application notes UCC38C44 12-V Isolated Bias Supply (Rev. A) Oct. 09, 2008
User guides UCC38C42 30-W Synchronous Buck Converter Reference Design Feb. 04, 2003
Application notes UCC38C42 25-W Forward Converter Sep. 06, 2002
Application notes UCC38C42 Family of High-Speed BiCMOS Current-Mode PWM Controllers Feb. 07, 2002
Application notes Conditioning a Switch-mode Power Supply Current Signal Using TI Op Amps Mar. 23, 2000
Application notes DN-30 Programmable Electronic Circuit Breaker Sep. 05, 1999
Application notes DN-42A Design Considerations for Transitioning from UC3842 to the New UCC3802 Sep. 05, 1999
Application notes DN-62 Switching Power Supply Topology Voltage Mode vs. Current Mode Sep. 05, 1999
Application notes U-111, Practical Considerations in Current Mode Power Supplies Sep. 05, 1999

Design & development

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Design tools & simulation

SIMULATION MODELS Download
SLUM522.ZIP (4 KB) - PSpice Model
SIMULATION MODELS Download
SLVM045.TSC (70 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SLVM046.TSC (70 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SLVM047.TSM (9 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SLVM048.TSM (9 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SLVM049.ZIP (101 KB) - PSpice Model
SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
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  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
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Reference designs

REFERENCE DESIGNS Download
High efficiency, ultra-wide input (20 VDC to 375 VDC) isolated power supply reference design
PMP30720 — 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 side (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
200-V at 400-mA LED lighting from a 24-V input reference design
PMP30653 — This boost LED reference design uses the UCC28C42 controller to generate a non-isolated output (200-V at 400-mA) from a DC input (20-V - 28-V). The UCC28C42 provides a cost effective and precise constant-current regulation and is able to drive a 400-mA LED string up to a LED voltage of 200-V. An (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
AC/DC Buck Converter with 85VAC - 318VAC Input and 15V at 0.8A Output Reference Design
PMP10783 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.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
85-318Vin, 15Vout, 1Aout, AC-DC Buck Converter Reference Design
PMP10833 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.
document-generic Schematic document-generic User guide
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 document-generic User guide
REFERENCE DESIGNS Download
120VAC Input, 3.3V/1.2A Output, Non-Isolated Flyback
PMP6716 — This reference design uses the UCC28C42 in a non-isolated flyback topology to generate 3.3V, 1.2V and 22V from a US line AC input. The total output power is 4W. The 3.3V output is regulated by the UCC28C42. A TLV1117LV LDO is used to generate the 1.2V output from the 3.3V output. The 22V output is (...)
REFERENCE DESIGNS Download
120VAC Input, 5V/0.8A Output, Non-Isolated Flyback
PMP6811 — This reference design uses the UCC28C42 in a non-isolated flyback topology to generate 5V at 0.8A from a US line AC input. This low-cost, compact design is over 70% efficient at maximum load.

CAD/CAE symbols

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

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