UCC28781ARTWR
ActiveHIGH-DENSITY, ZERO-VOLTAGE SWITCHING (ZVS) FLYBACK CONTROLLER WITH INTEGRATED SR CONTROL
UCC28781ARTWR
ActiveHIGH-DENSITY, ZERO-VOLTAGE SWITCHING (ZVS) FLYBACK CONTROLLER WITH INTEGRATED SR CONTROL
Description
General part information
UCC28781 Series
The UCC28781 is a zero-voltage-switching (ZVS) controller which can be used at very high switching frequencies to minimize the size of the transformer and enable high power density.
With direct synchronous rectifier (SR) control, the controller does not need a separate SR controller, as it can drive the SR FET directly to maximize efficiency and simplify design. (For isolated applications, an isolated gate-driver IC is required.)
Using adaptive dead-time control for ZVS, switching losses and EMI are minimized. This design results in a controller with extremely high conversion efficiency across the entire operating range.
Technical Specifications
Parameters and characteristics for this part
| Specification | UCC28781ARTWR |
|---|---|
| Control Features | Soft Start |
| Fault Protection | Short Circuit, Current Limiting, Over Voltage, Over Temperature, Over Power |
| Frequency - Switching | 500 kHz |
| Mounting Type | Surface Mount |
| Operating Temperature (Max) | 125 °C |
| Operating Temperature (Min) | -40 °C |
| Output Isolation | Isolated |
| Package / Case | 24-WFQFN Exposed Pad |
| Package Length | 4 mm |
| Package Name | 24-WQFN |
| Package Width | 4 mm |
| Topology | Secondary Side SR, Flyback |
| Voltage - Start Up | 500 mV |
| Voltage - Supply (Vcc/Vdd) Maximum | 34 V |
| Voltage - Supply (Vcc/Vdd) Minimum | 14 V |
Pricing
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