Home Power management AC/DC & isolated DC/DC switching regulators Flyback controllers
Home
Power management
AC/DC & isolated DC/DC switching regulators
Flyback controllers

UCC28700-Q1

ACTIVE

Compact primary-side regulation PWM controller with automotive grade

Order now
Data sheet

UCC28700-Q1

ACTIVE
Data sheet Order now

Product details

Topology Buck, Flyback Control mode Primary-side regulation Duty cycle (max) (%) 99 Switching frequency (max) (kHz) 132 Features Current limiting, DCM, Error amplifier, Green mode, Input line monitor, Leading edge blanking, Light-load efficiency, Low power, PSR, Soft start UVLO thresholds on/off (V) 21/8 Operating temperature range (°C) -40 to 125 Rating Automotive Gate drive (typ) (A) 0.025 TI functional safety category Functional Safety-Capable
Topology Buck, Flyback Control mode Primary-side regulation Duty cycle (max) (%) 99 Switching frequency (max) (kHz) 132 Features Current limiting, DCM, Error amplifier, Green mode, Input line monitor, Leading edge blanking, Light-load efficiency, Low power, PSR, Soft start UVLO thresholds on/off (V) 21/8 Operating temperature range (°C) -40 to 125 Rating Automotive Gate drive (typ) (A) 0.025 TI functional safety category Functional Safety-Capable
SOT-23 (DBV) 6 8.12 mm² 2.9 x 2.8
  • Qualified for Automotive Applications
  • AEC-Q100 Qualified with the Following Results:
    • Device Temperature Grade 1: –40°C to 125°C
    • Device HBM Classification Level 2: ±2 kV
    • Device CDM Classification Level C4B: 750 V
  • Functional Safety-Capable
  • < 30-mW Standby Power Consumption
  • Primary-Side Regulation (PSR) Eliminates Opto-Coupler
  • ±5% Voltage and Current Regulation
  • 130-kHz Maximum Switching Frequency
  • Quasi-Resonant Valley-Switching Operation for Highest Overall Efficiency
  • Patent-Pending Frequency-Jitter Scheme to Ease EMI Compliance
  • Wide VDD Range Allows Small Bias Capacitor
  • Clamped Gate-Drive Output for MOSFET
  • Protection Functions: Overvoltage, Low-Line, and Overcurrent
  • Programmable Cable Compensation
  • SOT23-6 Package
  • Qualified for Automotive Applications
  • AEC-Q100 Qualified with the Following Results:
    • Device Temperature Grade 1: –40°C to 125°C
    • Device HBM Classification Level 2: ±2 kV
    • Device CDM Classification Level C4B: 750 V
  • Functional Safety-Capable
  • < 30-mW Standby Power Consumption
  • Primary-Side Regulation (PSR) Eliminates Opto-Coupler
  • ±5% Voltage and Current Regulation
  • 130-kHz Maximum Switching Frequency
  • Quasi-Resonant Valley-Switching Operation for Highest Overall Efficiency
  • Patent-Pending Frequency-Jitter Scheme to Ease EMI Compliance
  • Wide VDD Range Allows Small Bias Capacitor
  • Clamped Gate-Drive Output for MOSFET
  • Protection Functions: Overvoltage, Low-Line, and Overcurrent
  • Programmable Cable Compensation
  • SOT23-6 Package

The UCC28700-Q1 of flyback power supply controllers provides Constant-Voltage (CV) and Constant-Current (CC) output regulation without the use of an optical coupler. The devices process information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current. Low start-up current, dynamically controlled operating states and a tailored modulation profile support very low standby power without sacrificing start-up time or output transient response.

Control algorithms in the UCC28700-Q1 allows operating efficiencies to meet or exceed applicable standards. The output drive interfaces to a MOSFET power switch. Discontinuous Conduction Mode (DCM) with valley switching reduces switching losses. Modulation of switching frequency and primary current peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.

The controllers have a maximum switching frequency of 130 kHz and always maintain control of the peak-primary current in the transformer. Protection features help keep primary and secondary component stresses in check. The UCC28700-Q1 allows the level of cable compensation to be programmed.

The UCC28700-Q1 of flyback power supply controllers provides Constant-Voltage (CV) and Constant-Current (CC) output regulation without the use of an optical coupler. The devices process information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current. Low start-up current, dynamically controlled operating states and a tailored modulation profile support very low standby power without sacrificing start-up time or output transient response.

Control algorithms in the UCC28700-Q1 allows operating efficiencies to meet or exceed applicable standards. The output drive interfaces to a MOSFET power switch. Discontinuous Conduction Mode (DCM) with valley switching reduces switching losses. Modulation of switching frequency and primary current peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.

The controllers have a maximum switching frequency of 130 kHz and always maintain control of the peak-primary current in the transformer. Protection features help keep primary and secondary component stresses in check. The UCC28700-Q1 allows the level of cable compensation to be programmed.
open-in-new Find other Flyback controllers
Download View video with transcript Video

Similar products you might be interested in

open-in-new Compare products
Drop-in replacement with upgraded functionality to the compared device.
UCC28700 ACTIVE Constant-voltage, constant-current PWM with PSR & Programmable cable compensation This is the non-automotive variant

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 7
Type Title Date
* Data sheet UCC28700-Q1 Constant-Voltage, Constant-Current Controller With Primary-Side Regulation datasheet (Rev. A) PDF | HTML 08 Dec 2020
Application note Designing a Robust Traction Inverter Redundant Power Supply From 800 V Battery (Rev. C) PDF | HTML 16 Feb 2023
Functional safety information UCC28700-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA PDF | HTML 18 Aug 2020
Application note Minimize Standby Consumption for UCC287XX Family 01 Aug 2019
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Technical article Hybrid electric vehicles and electric vehicles need different isolated DC/DCs to win 27 Dec 2017
Application note Troubleshooting TI PSR controllers 03 Oct 2016

Design & development

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

Evaluation board

UCC28700EVM-068 — UCC28700 evaluation module

The Texas Instruments UCC28700EVM-068 evaluation module (EVM) helps designers evaluate the performance of the UCC28700 Constant-Voltage, Constant-Current PWM with Primary-Side Regulation. The 5W EVM is used for evaluating an off line adapter for USB applications. It converts a 90V to 265V RMS (...)
User guide: PDF
Not available on TI.com
Simulation model

UCC2870x PSPICE Transient Model

SLUM455.ZIP (131 KB) - PSpice Model
Download
Simulation model

UCC2870x TINA-TI Transient Reference Design

SLUM619.TSC (195 KB) - TINA-TI Reference Design
Download
Simulation model

UCC2870x TINA-TI Transient Spice Model

SLUM617.ZIP (101 KB) - TINA-TI Spice Model
Download
Calculation tool

MathCAD Design Tool (Rev. C)

SLUC381C.ZIP (2519 KB)
Download
Calculation tool

UCC28700 Excel 97 Design Tool (Rev. B)

SLUC408B.ZIP (205 KB)
Download
Reference designs

TIDA-01604 — 98.6% Efficiency, 6.6-kW Totem-Pole PFC Reference Design for HEV/EV Onboard Charger

This reference design functions from a base of silicon carbide (SiC) MOSFETs that are driven by a C2000 microcontroller (MCU) with SiC-isolated gate drivers. The design implements three-phase interleaving and operates in continuous conduction mode (CCM) to achieve a 98.46% efficiency at a 240-V (...)
Design guide: PDF
Schematic: PDF
Reference designs

PMP20583 — Primary-Side Regulated Flyback Converter for Electric Vehicle Battery Monitoring Reference Design

PMP20583 is a primary-side regulated flyback reference design which provides a ground referenced 5V output and an isolated 5V output at up to 80mA each from an input voltage of 37V to 125V. This design uses the UCC28700-Q1 flyback controller for constant voltage and constant current control of the (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP10739 — 90 to 110Vin 12Vout @ 0.3A Non-Sync Buck Converter Reference Design

PMP10739 is a 3.6W buck converter using the UCC28700 controller IC. The design accepts an input voltage of 90Vin to 110Vin and provides an output of 12Vout capable of supplying 0.3A of current to the load. The UCC28700 has a frequency dithering feature for reduced EMI.
Test report: PDF
Schematic: PDF
Package Pins Download
SOT-23 (DBV) 6 View options

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

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

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