Packaging information
| Package | Pins SOIC (D) | 7 |
| Operating temperature range (°C) -40 to 125 |
| Package qty | Carrier 2,500 | LARGE T&R |
Features for the UCC28730
- Enables Zero-Power (<5 mW) standby consumption
- Smart Wake-Up detection enables smallest output capacitance
- Primary-side regulation (PSR) eliminates optocoupler
- ±5% voltage regulation and current regulation across line and load
- 700-V start-up switch
- 83-kHz maximum switching frequency enables low stand-by power charger designs
- Resonant-ring valley-switching operation for highest overall efficiency
- Frequency-dither to ease EMI compliance
- Clamped gate-drive output for MOSFET
- Overvoltage, low-line, and overcurrent protection functions
- Programmable cable compensation
- SOIC-7 package
Description for the UCC28730
The UCC28730 isolated-flyback power supply controller provides Constant-Voltage (CV) and Constant-Current (CC) output regulation without the use of an optical coupler, and wake-up signal detection to improve transient response to large load steps. A minimum switching frequency of 30 Hz facilitates achieving less than 5 mW of no-load power. This device processes information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current. The wake-up monitoring works with a secondary-side alarm device such as the UCC24650 to deliver rapid response to heavy load steps using minimal output capacitance.
An internal 700-V start-up switch, dynamically- controlled operating states and a tailored modulation profile support ultra-low stand-by power without sacrificing start-up time or output transient response. Control algorithms in the UCC28730 allow operating efficiencies to meet or exceed applicable standards. Discontinuous conduction mode (DCM) operation with valley-switching reduces switching losses. Modulation of the switching frequency and primary current peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.