UCC24630
- Secondary-Side SR Controller Optimized for 5-V to 24-V Flyback Systems
- Operating Frequency Up to 200 kHz
- Volt-Second Balance SR On-Time Control
- Minimize Effect of MOSFET Device and Layout Inductance
- CCM Operation Compatibility
- Compatible with PSR and SSR Control
- Auto Low-Power Detect and 110-µA Standby Mode Current
- Wide VDD Range from 3.6 V to 28 V
- Rail-to-Rail Gate Driver with 13-V Clamp
- Open and Short Pin Fault Protection
The UCC24630 SR controller is a high-performance controller and driver for N-channel MOSFET power devices used for secondary-side synchronous rectification.
The combination of controller and MOSFET emulates a near-ideal diode rectifier. This solution not only directly reduces power dissipation of the rectifier but also reduces primary-side losses as well, due to compounding of efficiency gains.
Utilizing a volt-second balancing control method, the UCC24630 is ideal for flyback power supplies over a wide-output voltage range since the device is not connected directly to the MOSFET drain. The SR drive turn-off threshold is not dependent on the MOSFET RDS(on) which allows optimizing for maximum conduction time. Also secondary current ringing due to device and layout inductance does not affect the SR turn-off threshold.
The UCC24630 controller offers a programmable false-trigger filter, a frequency detector to automatically switch to standby mode during low power conditions and pin fault protections. The UCC24630 is compatible with DCM, TM and CCM operation.
The wide VDD operating range, wide programming range of the VPC voltage and blanking time, allows use in a variety of flyback converter designs.
Technical documentation
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | UCC24630 Synchronous Rectifier Controller With Ultra-Low-Standby Current datasheet (Rev. A) | PDF | HTML | 30 Mar 2015 |
| Application note | UCC24630 and UCC24636 SR-Control Configurations Guide | 18 Dec 2017 | ||
| EVM User's guide | Using the UCC24630EVM-636 65-W AC-to-DC Adapter (Rev. B) | 12 Dec 2016 | ||
| Technical article | Achieving low standby power and high efficiency in flyback converters | PDF | HTML | 27 Jul 2015 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
UCC24630EVM-636 — UCC24630 65W AC/DC Adapter
This is a high efficiency 65W AC/DC design using UCC24630 Synchronous Rectification Controller for a Universal input (85Vac to 265Vac) to 19.5V @3.33A output exceeding CoC-5 Tier2 and DOE Level VI performance requirements for external power supplies.
TIDA-00702 — 60W, 24V High Efficiency Industrial Power Supply with Precision Voltage, Current and Power Limit
TIDA-00701 — 100W, 24V High Efficiency High PF Industrial Power Supply with Precision Current & Power Limit
TIDA-00519 — 65W High-efficiency CoC-5 tier2/DOE Level VI AC Adapter
PMP11329 — Universal Line to 13 Volts at 4.6 Amps Power Supply Reference Design
PMP10145 — 38W Offline AC/DC Transition Mode Synchronous Flyback Converter Reference Design
PMP10974 — Universal AC Input 5V/10A/50W PSR Flyback Power Supply With Over 89% Avg Efficiency Reference Design
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOT-23 (DBV) | 6 | Ultra Librarian |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
- Fab location
- Assembly location
Support & training
TI E2E™ forums with technical support from TI engineers
Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.
If you have questions about quality, packaging or ordering TI products, see TI support.