Calculation tool
UCC28722
Low-Cost CVCC Flyback controller With primary-side regulation for bipolar Power Device
Data sheet
UCC28722
- < 50-mW No-Load Power
- Primary-Side Regulation (PSR) Eliminates Opto-
Coupler - Dynamic BJT Drive
- ± 5% Voltage and Current Regulation Across Line
and Load - 80-kHz Maximum Switching Frequency Enables
High-Power Density Charger Designs - Quasi-Resonant Valley-Switching Operation for
Highest Overall Efficiency - Wide VDD Range Allows Small Bias Capacitor
- Output Overvoltage, Low-Line, and Overcurrent
Protection Functions - Programmable Cable Compensation
- SOT23-6 Package
The UCC28722 flyback power supply controller provides isolated-output constant-voltage (CV) and constant-current (CC) output regulation without the use of an optical coupler. The device processes information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current.
Dynamically-controlled operating states and a tailored modulation profile support high-efficiency operation at all load levels without sacrificing output transient response.
Control algorithms in the UCC28722 device allow operating efficiencies to meet or exceed applicable standards. The output drive interfaces to a bipolar transistor power switch, enabling lower-cost converter design. Discontinuous conduction mode (DCM) with valley switching reduces switching losses, while 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 controller has a maximum switching frequency of 80 kHz and always maintains control of the peak-primary current in the transformer. Output overvoltage and overcurrent as well as input undervoltage protection features help keep primary and secondary component stresses in check. The UCC28722 also allows compensation for voltage drop in the cable to be programmed with an external resistor.
Technical documentation
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Evaluation board
UCC28720EVM-212 — UCC28720EVM-212 5W Evaluation Module for USB off-line adapter
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 (...)
User guide: PDF
Simulation model
UCC28722 Unencrypted PSpice Transient Model Package (Rev. A)
SLUM466A.ZIP (64 KB) - PSpice Model
Calculation tool
SLUC529 — UCC28722 Excel Design Tool
Supported products & hardware
Reference designs
PMP10236 — Dual-Output 5V at 300mA and 15V at 100mA Isolated Flyback From 85V to 440V AC Mains Reference Design
This is an isolated quasi-resonant flyback converter, supplying 5 V at 300 mA and 15 V at 100 mA; both outputs are isolated from each other. The UCC28722 has been chosen to drive a low-cost high-voltage BJT transistor.
Reference designs
PMP10397 — Ultra-wide Input Range, Dual Output, AC/DC Bias Supply with PSR control and BJT Reference Design<
This design uses low cost primary side regulation (PSR) IC UCC28722 with a bipolar transistor for ultra-wide input range applications (85VAC to 528VAC). Two outputs with separated grounds, 5V/0.3A and 16.5V/0.1A are generated.
Reference designs
PMP30281 — 85-VAC - 480-VAC input, multiple output flyback reference design
This offline flyback reference design uses the UCC28722 controller to generate 2 isolated outputs (5 V at 400 mA, 24 V at 300 mA) from an AC input (85 VAC - 480 VAC). The UCC28722 output drive interfaces to a bipolar transistor power switch, enabling a more efficient design than a typical design. (...)
Reference designs
PMP7668 — Wide Input 2W Bias Power Supply Reference Design
This reference design is a 2W bias power supply for applications requiring operation over a wide input range (110 - 500VAC). The small form factor (69mm x 26mm) and high efficiency of this design make it ideal for e-metering applications. Information provided in this design will reduce time to (...)
Reference designs
PMP11062 — Universal AC Input, 380V/1kW CCM Boost Power Factor Regulator Reference Design
The PMP11062 reference design uses the UCC28180 CCM PFC controller to generate a 380V/1kW output from a universal AC input. In addition to that, the UCC28722 PSR controller is used as bias supply in this design. Over 96% peak efficiency is achieved at 120VAC/60Hz input and over 98% (...)
Reference designs
PMP11211 — Universal AC Input, 200kHz 380V/1kW CCM Boost Power Factor Regulator Reference Design
The PMP11211 reference design uses the UCC28180 CCM PFC controller to generate a 380V/1kW output from a universal AC input. In addition to that, the UCC28722 PSR controller is used as bias supply in this design. Over 94% peak efficiency is achieved at 120VAC/60Hz input and over 97% (...)
Reference designs
PMP12074 — 230VAC Input, 200kHz 380V/1kW CCM Boost Power Factor Regulator Reference Design
The PMP12074 reference design uses the UCC28180 CCM PFC controller to generate a 380V/1kW output from a 230VAC input. In addition to that, the UCC28722 PSR controller is used as bias supply in this design. Over 97% efficiency is achieved at 230VAC/50Hz input with fixed 200kHz switching (...)
Reference designs
TIDA-00583 — 5V/1.6A & 12V/10mA AC/DC Flyback PSU for E-meter Apps Optimized for Low AC Line Input Ref Design
The TIDA-00583 is a Flyback converter which can operate in very low AC line input (Minimum 45Vac) and provide a regulated, fully-isolated 5V@1.6A output for communication model of E-meter, as well as another low-power 12V non-isolated output. Featuring TIs UCC28722 PSR controller which provides (...)
Reference designs
TIDA-00628 — Snubberless, Non-Isolated AC/DC Flyback Converter Reference Design with Simplified Transformer
TIDA-00628 is a 15V/6.5W non-isolated, single output, AC/DC Flyback power supply that is capable of operating from wide input voltage ranging from 85Vac to 440Vac. This design demonstrates 2 key features (1) the elimination of snubber components enabled by use of a high-voltage bipolar transistor (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOT-23 (DBV) | 6 | Ultra Librarian |
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