UCC28700

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Constant-voltage, constant-current PWM with PSR & Programmable cable compensation

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Product details

Parameters

Control method Primary-side regulation Duty cycle (Max) (%) 99 Frequency (Max) (kHz) 132 UVLO thresholds on/off (V) 21/8.1 Features PSR, DCM Operating temperature range (C) -20 to 125 Rating Catalog open-in-new Find other Flyback controllers

Package | Pins | Size

SOT-23 (DBV) 6 5 mm² 2.9 x 1.6 open-in-new Find other Flyback controllers

Features

  • < 30-mW No-Load Power for 5-Star Rating
  • Primary-Side Regulation (PSR) Eliminates Opto-Coupler
  • ±5% Voltage and Current Regulation
  • 130-kHz Maximum Switching Frequency Enables High-Power
    Density Charger Designs
  • 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 (UCC28700 Only)
  • NTC Resistor Interface (UCC28701, UCC28702 and UCC28703
    Only) With Fixed Cable Compensation Options
  • SOT-23 Package
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Description

The UCC28700 family 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 family allow 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 allows the level of cable compensation to be programmed. The UCC28701, UCC28702, and UCC28703 devices allow remote temperature sensing using a Negative Temperature Coefficient (NTC) resistor while providing fixed cable-compensation levels.

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Technical documentation

Design & development

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

Hardware development

EVALUATION BOARDS Download
UCC28700 evaluation module
UCC28700EVM-068
document-generic User guide
$49.00
Description
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 input (...)
Features
  • <30mW no load power for 5 star rating
  • Primary Side Regulation (PSR) eliminates opto-coupler
  • +/- 5% Voltage & Current Regulation
  • 130 KHz max. switching frequency enables high power density charger designs
  • Quasi-resonant valley switching operation for highest overall efficiency
  • Wide VDD range (35V) allows (...)
EVALUATION BOARDS Download
UCC28711 evaluation module
UCC28711EVM-160
document-generic User guide
$49.00
Description
The Texas Instruments UCC28711EVM-160 evaluation module (EVM) helps designers evaluate the performance of the UCC28711 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 input (...)
Features
  • <10mW no load power
  • Primary Side Regulation (PSR) eliminates opto-coupler
  • +/- 5% Voltage & Current Regulation
  • 100 KHz max switching frequency enables high power density charger designs
  • Quasi-resonant valley switching operation for highest overall efficiency
  • Wide VDD range (35V) allows small bias (...)
EVALUATION BOARDS Download
document-generic User guide
$49.00
Description
The UCC28720EVM-212 is a 5W evaluation module for evaluating an off line adapter for USB applications. It is intended for evaluation purposes and is not intended to be an end product. The UCC28720EVM-212 converters 100V to 240V RMS input voltage down to 5V DC, with a 1A current limit for USB adapter (...)
Features
  • <10mW no load power
  • Primary Side Regulation (PSR) eliminates opto-coupler
  • +/- 5% Voltage & Current Regulation
  • Quasi-resonant valley switching operation for highest overall efficiency
  • Wide VDD range (35V) allows small bias capacitor
  • Drive Output for low cost Bipolar
  • Protection Functions: Over Voltage, Low (...)

Design tools & simulation

SIMULATION MODELS Download
SLUM455.ZIP (131 KB) - PSpice Model
SIMULATION MODELS Download
SLUM617.ZIP (101 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SLUM619.TSC (195 KB) - TINA-TI Reference Design
CALCULATION TOOLS Download
SLUC381C.ZIP (2519 KB)
CALCULATION TOOLS Download
SLUC408B.ZIP (205 KB)

Reference designs

REFERENCE DESIGNS Download
85-VAC - 400-VAC input multiple output flyback reference design
PMP30428 — This offline flyback reference design uses the UCC28700 controller to generate 2 isolated outputs (12 V at 1.2 A, -3.3 V at 10 mA) from an AC input (85 VAC - 400 VAC). The controller provides accurate voltage and current regulation with primary-side feedback, eliminating the need for opto-coupler (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Universal AC/DC Buck Converter Reference Design with PSR Controller
PMP20345 — The PMP20345 reference design uses Buck converter to convert universal AC input voltage (102Vac to 265Vac) to a 50V/190mA DC output with UCC28700 primary side regulated controller. Peak efficiency of this design is over 87.5%.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
85-265VAC Input, 54V/30W Power Over Ethernet PSE Reference Design
PMP20199 — This reference design provides a universal AC input, 30W PSE solution for Power Over Ethernet.  The UCC28700 uses primary side regulation to create an isolated 54V rail at low cost.  The TPS23861 injects the 54V rail onto the ethernet cable.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
US Line (120VAC +/- 15%) Input, 12V/1.5A Output Bias Supply Reference Design
PMP20869 The PMP20869 is a low cost bias supply reference design with 12V/1.5A output from 120VAC input. This design uses a UCC28700 constant current/constant voltage PWM with primary-side regulation flyback controller and single layer PCB to reduce the overall BOM cost. 
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
85VAC to 264VAC Input, 12V/450mA and 5V/50mA Dual Output Bias Supply Reference Design
PMP20339 — The PMP20339 is a low cost bias supply reference design with 12V/450mA and 5V/50mA outputs from 120VAC input. A dual-output flyback converter with UCC28700 primary-side regulation controller is used to generate 12V and 5V outputs. Single layer PCB is applied to reduce the overall BOM cost.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Ultra-Wide Input Voltage Range PSR Flyback Converter Reference Design
PMP10200 The PMP10200 reference design uses the UCC28700 primary-side regulated quasi-resonant flyback controller to generate a 28V output from an DC input. The input voltage range is between 25VDC and 520VDC. It is a low cost solution because no optocoupler is needed to regulate the output voltage.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Primary-Side Regulated Flyback with 85 to 265VAC Input (12V @ 0.5A) Reference Design
PMP8787 The PMP8787 reference design uses the UCC28700 flyback controller to generate a 12V/500mA output from a universal AC input. The primary-side regulation technique implemented by the UCC28700 eliminates the need for an opto coupler, reducing the size and cost of the design. In addition, the valley (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
300VDC-800VDC Input, 54W 4 Channel Outputs, PSR Flyback with SiC-FET Reference Design
PMP10415 This design uses low cost primary side regulation (PSR) IC UCC28700 with a SiC-FET for 300VDC-800VDC input range. Four outputs with separated grounds, 25V/19W, 25V/17W, 25V/10.1W, and 25V/8W are generated.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
AC/DC Auxiliary Supply Reference Design using UCC28700
PMP10937 The PMP10937 reference design uses Buck converter to convert universal AC input voltage  to a 18V/0.3A DC output with UCC28700 controller. Circuit simplicity is achieved with quasi-resonant valley-switching operation and the utilization of Buck topology. With all components placed within the (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
USB-C, DFP, 5V/3A Out, 85-265VAC In, Adapter, Low Cost Reference Design
PMP11124 The PMP11124 reference design uses the UCC28700 and TPS25810 to provide an isolated 5V at 3A over a USB type C interface.  The UCC28700 implements primary-side regulation, eliminating the need for an opto-coupler and reducing the size and cost of the design.  Cost is further minimized by (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
85-480VAC Input, Triple Ouput (12V/0.7A) AC/DC Flyback Reference Design
PMP10344 This reference design generates three separate isolated 12V/0.77A outputs from either an 85-265VAC single phase input or a 200-480VAC-LL three phase input.  The UCC28700 controls a flyback converter power stage.  The primary side regulation feature of the UCC28700 eliminates the need for (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
85VAC - 265VAC Isolated Flyback Design for Small Appliances Reference Design
PMP10276 PMP10276 is an isolated flyback design with an input range of 85VAC - 265VAC, and an output of 12V at 2A using UCC28700 PSR controller. Efficiency is greater than 83.8% at 120VAC input and 84% at 230VAC input. PMP10276 also has 111mW and 174mW no load power consumptions at 120VAC input and 230VAC (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Universal 85VAC-264VAC Input, 24V 1A Output, PSR Flyback Reference Design
PMP10468 This design uses low-cost primary side regulation (PSR) IC UCC28700 for universal 85VAC-264VAC input range. A 24V output is generated with maximum 24W rating.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High Line Input to 12V@1A Primary Side Regulated, Quasi Resonant Flyback Reference Design
PMP7249 Low component count and low cost isolated flyback, converting the high line mains (180Vac…275Vac) to 12V@1A, 1.2Amax. Thanks to the UCC28700 controller, no optocoupler is needed to close the loop.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
200VAC-400VAC Input, 24V 50W Output, PSR Flyback with SiC-FET Reference Design
PMP10416 This design uses low-cost primary side regulation (PSR) IC UCC28700 with a SiC-FET for 200VAC-400VAC input range. A 24V output is generated with maximum 50W rating.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Small and Simple Isolated Flyback Universal Vin, 5.2V@200mA, Primary-side Regulated Reference Design
PMP8555 Design features low component count and low cost isolated flyback, converting the universal mains (85Vac…275Vac) to 5.2V@200mA. Due to primary side regulation of the controller UCC28700, no optocoupler is needed to close the loop.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
8W Primary-Side Regulated Flyback Using UCC28700 Reference Design
PMP8632 This design is a primary side regulated flyback (optocoupler-less) with secondary side synchronous rectification and an input voltage range of 85VAC to 240VAC. It delivers an output of 5.0V@1.6A.
Design files
REFERENCE DESIGNS Download
Primary-Side Regulated Flyback with 85-265VAC Input and 9V/2.5A Output Reference Design
PMP8966 — The PMP8966 reference design uses the UCC28700 primary-side regulated flyback controller to generate a 9V/2.5A output from a univeral AC input. The valley switching of the UCC28700 allows this low-cost design to achieve a maximum load efficiency of 85%; no load losses are less than 60mW.
REFERENCE DESIGNS Download
High Efficiency Primary-Side Regulation Flyback with 23-56Vin to 5Vout/0.6A Reference Design
PMP9009 — PMP9009 has been designed as a competitive open-frame alternative for the communications market with 23-56Vin to 5Vout/0.6A. PMP9009 has a basic insulation system from input to output making it suitable for a wide variety of applications. UCC28700 is used as the controller for primary-side (...)
REFERENCE DESIGNS Download
Primary-Side Regulated Flyback with 85-277VAC Input (24V @ 0.5A) Reference Design
PMP9018 — The PMP9018 reference design uses the UCC28700 primary-side regulated flyback controller to generate a 24V/0.5A output from an 85V-277V AC input. The valley switching of the UCC28700 allows this low-cost design to achieve efficiencies over 87%; no load losses are less than 50mW.
REFERENCE DESIGNS Download
Primary-Side Regulated Flyback with 85-265VAC Input (16V @ 1A) Reference Design
PMP9028 — The PMP9028 reference design uses the UCC28700 primary-side regulated flyback controller to generate a 16V/1A output from a univeral AC input. The valley switching of the UCC28700 allows this low-cost design to achieve a maximum load efficiency over 85%; no load losses are less than 50mW.
Design files
REFERENCE DESIGNS Download
Primary-Side Regulated Flyback with 85-265VAC Input (15V @ 1A) Reference Design
PMP8977 — The PMP8977 reference design uses the UCC28700 primary-side regulated flyback controller to generate a 15V/1A output from a univeral AC input. The valley switching of the UCC28700 allows this low-cost design to achieve a maximum load efficiency near 85%; no load losses are less than 50mW.
Design files
REFERENCE DESIGNS Download
380V/350mA Dimmable LED Driver using Single String LLC Solution without Dimming FET
PMP4371 — This design is based on PMP4350 and supports higher output voltage up to 380V. Different from PMP4350, the high voltage LED switch MOSFET is removed and reduced overall cost. With additional resistor and capacitor from LEDSW to CS pin, the LED driver demos good linearity dimming performnace under (...)
Design files
REFERENCE DESIGNS Download
Primary-Side Regulated Flyback with 85-265VAC Input (12V @ 3W) Reference Design
PMP8869 — The PMP8869 reference design uses the UCC28700 primary-side regulated flyback controller to generate a 12V/250mA output from a universal AC input. The valley switching of the UCC28700 allows this low-cost design to achieve a maximum load efficiency over 80%; no load losses are less than 30mW. This (...)
REFERENCE DESIGNS Download
85 to 265VAC Input 5V@4A Dual Port Charger For Tablets and Smart Phones Reference Design
PMP8817 — This reference design is capable of charging two devices at 2A each with over 85% efficiency. The UCC24610 synchronous rectifier controller and CSD18533Q5A FET reduce the rectifier loss and provide ultra-high efficiency with a minimal increase in cost. The UCC28700 primary-side regulated flyback (...)
REFERENCE DESIGNS Download
Universal AC Input 150W Single String 200V/700mA Output LLC Converter without CT
PMP4350 — The reference design is a high effiency (>94%) isolated AC/DC single string output LED lighting solution for high watt (>100W) general LED lighting. The topology uses Transition Mode (TM) PFC plus LLC control, which can support PWM dimming and analog dimming on the output side. The target (...)
Design files
REFERENCE DESIGNS Download
Primary-Side Regulated Flyback with 184 to 265VAC Input (12V @ 3W) Reference Design
PMP8764 — The PMP8764 reference design uses the UCC28700 primary-side regulated flyback controller to generate a 12V/250mA output from a 230VAC input. The valley switching of the UCC28700 allows this low-cost design to achieve a maximum load efficiency over 78%; no load losses are only 30mW. This circuit fits (...)
REFERENCE DESIGNS Download
Primary-Side Regulated Flyback with 85 to 265VAC Input (16.5V @ 1A) Reference Design
PMP8781 — The PMP8781 reference design uses the UCC28700 primary-side regulated flyback controller to generate a 16.5V/1A output from a univeral AC input. The valley switching of the UCC28700 allows this low-cost design to achieve a maximum load efficiency near 85%; no load losses are less than 50mW.
Design files
REFERENCE DESIGNS Download
Flyback Converter using UCC28700 (3.3V @ 1.5A)
PMP8519 — This design is a primary side regulated flyback (optocoupler-less) with universal AC input range and delivers an output of 3.3V @ 1.5A. It is a small solution and ideal for wall adpaters.
Design files
REFERENCE DESIGNS Download
5V@2A adapter with universal input range
PMP4351 — This reference design demostrates a low cost 5V2A adapter solution with primary side regulation controller UCC28700 which eliminates opto-coupler. Feature: 1.) Efficiency > 80%@230Vac; 2.) Pricise CC and CV control; 3.) Protection features like OCP, SCP and output OVP 4.) Low no-load power <35mW.
REFERENCE DESIGNS Download
Primary-Side Regulated Flyback with 85-265VAC Input, (5.9V @ 1.5A)
PMP8500 — The PMP8500 reference design uses the UCC28700 primary-side regulated flyback controller to generate a 5.9V/1.5A output from a univeral AC input. The valley switching of the UCC28700 allows this low-cost design to achieve a maximum load efficiency greater than 78%; no load losses are less than 30mW (...)
REFERENCE DESIGNS Download
AC Adapter with PSR Control (12V@1A)
PMP4336 — This reference design demostrates a low cost 12V, 1A AC/DC design with primary side regulation controller UCC28700 which eliminates opto-coupler. Features include 84% efficiency @ 230 VAC, precise CC and CV control, protection features like OCP, SCP and output OVP, and low no-load power consumption (...)
REFERENCE DESIGNS Download
USB Phone Charger (5V @ 1A) Reference Design
PMP8757 — This design demostrates a low cost solution for a 5V1A cube charger. By using primary side regulation (PSR) mode chip UCC28700, < 30-mW No-Load power is achieved, which meets 5-star rating. The overall size is compact, 22.5mm(L) x 20mm(W) x 20mm(H).
Design files
REFERENCE DESIGNS Download
'120VAC Input, 5V/2A Primary-Side Regulated Flyback
PMP8477 — The PMP8477 reference design uses the UCC28700 primary-side regulated flyback controller to generate a 5V/2A output from a standard 120VAC input. The valley switching of the UCC28700 allows this low-cost design to achieve a maximum load efficiency over 80% and has no-load losses of approximately (...)
REFERENCE DESIGNS Download
Universal AC input 5V1A Charger
PMP4335 — This reference design demostrates a low cost single PCB solution for 5V1A cube charger. By using primary side regulation (PSR) mode chip UCC28700, < 30-mW No-Load power is achieved, which meets 5-star rating. The overall size is limited in 22mm(L)X21mm(W)x20mm(H).
Design files
REFERENCE DESIGNS Download
Universal AC Input, 5V@2.1A Smart USB Charger Cube
PMP8286 — This reference design uses the UCC28700 in a quasi-resonant flyback to generate an isolated 5V at up to 2.1A. The UCC28700 implements primary-side regulation, eliminating the need for an opto-coupler and reducing the total component count. This results in a compact and cost effective design. The (...)

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SOT-23 (DBV) 6 View options

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Videos

UCC28740 Quick Charge Demo

Efficiency and performance of the UCC28740 constant voltage, constant current flyback controller.

Posted: 11-Mar-2014
Duration: 04:37

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