UCC28250
- Prebiased Start-up
- Synchronous Rectifier Control Outputs With Programmable Delays (Including Zero Delay Support)
- Voltage Mode Control With Input Voltage Feed-Forward or Current Mode Control
- Primary or Secondary-Side Control
- 3.3-V, 1.5% Accurate Reference Output
- 1-MHz Capable Switching Frequency
- 1% Accurate Cycle-by-Cycle Overcurrent Protection with Matched Duty Cycle Outputs
- Programmable Soft-Start and Hiccup Restart Timer
- Thermally Enhanced 4-mm × 4-mm QFN-20 Package and 20-pin TSSOP Package
The UCC28250 PWM controller is designed for high power density applications that may have stringent prebiased start-up requirements. The integrated synchronous rectifier control outputs target high-efficiency and high-performance topologies such as half-bridge, full-bridge, interleaved forward, and push-pull. The UCC27200 half-bridge drivers and UCC2732X MOSFET drivers used in conjunction with the UCC28250 provide a complete power converter solution.
Externally programmable soft-start, used in conjunction with an internal prebiased start-up circuit, allows the controller to gradually reach a steady-state operating point under all output conditions. The UCC28250 can be configured for primary or secondary-side control and either voltage or current mode control can be implemented.
The oscillator operates at frequencies up to 2 MHz, and can be synchronized to an external clock. Input voltage feedforward, cycle-by-cycle current limit, and a programmable hiccup timer allow the system to stay within a safe operation range. Input voltage, output voltage and temperature protection can be implemented. Dead time between primary-side switch and secondary-side synchronous rectifiers can be independently programmed.
Technical documentation
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | UCC28250 Advanced PWM Controller With Prebias Operation datasheet (Rev. D) | PDF | HTML | 28 Jun 2015 |
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
| Application note | Differences Between the UCC28251 and UCC28250 and Evaluation of the UCC28251 in (Rev. A) | 15 Feb 2013 | ||
| EVM User's guide | Using the UCC28250EVM-564 (Rev. A) | 07 Oct 2011 | ||
| EVM User's guide | Using the UCC28250EVM-501 Half Bridge DC-DC Converter with Primary Side Control (Rev. B) | 07 Dec 2010 | ||
| Application note | Designing UCC28250 as a Secondary Side Control with a Pre-Bias Condition | 24 Nov 2010 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
UCC28250EVM-501 — Evaluation Module for UCC28250 Advanced PWM Controller on Primary Side Control
UCC28250EVM-564 — Evaluation Module for UCC28250 Adv.PWM Controller w/ Pre-biased Load Op. on Secondary Side Control
UCC28250 Unencrypted PSPICE Average Model Package (Rev. A)
PMP8878 — 1/8 Brick Isolated DC/DC Telecom Power Module Reference Design
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| TSSOP (PW) | 20 | Ultra Librarian |
| VQFN (RGP) | 20 | Ultra Librarian |
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