Texas Instruments UCC28704 | Demoboard PMP20990

Description

The PMP20990 is a low cost bias supply reference design with 12V/1.5A output from 120VAC input. This design uses a UCC28704 constant current/constant voltage PWM with primary-side regulation flyback controller to reduce the BOM cost.The UCC28704 Off-line flyback controller is a highly integrated, 6-pin primary-side regulated PWM controller for designing high efficiency AC-to-DC power supplies with low standby power consumption to comply with global efficiency standards. The controller has ultra-low current consumption at startup to enable designs with <30-mW no-load input power and save standby mode energy consumption. Intelligent primary-side sensing and control enables 5% output voltage and current control without using an opto coupler or secondary-side feedback circuits.UCC28704 incorporates an enhanced load transient response technique which helps minimize the output capacitor, reducing the overall system size and cost. The controller also eliminates the need for loop compensation components which simplify the design and debugging process for power supply designers. The converter output voltage and current is regulated to prevent overstress conditions that may damage the load or connectors. Similarly, the CCUV shutdown feature monitors for an output under voltage fault to protect connectors from over heat or burn out from soft shorts, which greatly enhance overall system reliability. Board or component over temperature protection is facilitated with an NTC interface pin.UCC28704 can be readily used with TI secondaryside synchronous rectifier (SR) controllers at 2-A or higher output current levels for higher conversion efficiency or more compact designs.

Features

• Efficiency Performance Exceeds DoE Level VI and EU CoC V5 Tier-2 External Power Supply Standards
• Primary-Side Regulation Eliminates Opto-Coupler and Secondary Feedback Components
• Compatible with Synchronous Rectifier
• Enables <30-mW No-Load Input Power
• ±5% Output Voltage (CV) and Current (CC) Regulation
• Enhanced Dynamic Load Response
• Constant Current Output Under-Voltage Protection(CCUV) with Auto-Restart Response
• Cable Compensation (300 mV at 5-V Full Load)
• 85-kHz Maximum Switching Frequency
• DCM Valley-Switching Operation
• Clamped Gate-Drive Output for MOSFET
• NTC Resistor Interface
• Resistor or External HV Depletion-Mode FET Start-Up
• Fault Protections: Input Low Line, Output Over- Voltage, Over-Current, and Short-Circuit
• SOT23-6 Package- 120VAC nominal (102VAC to 138VAC) 50/60Hz input to 12V/1.5A output
• Conduction EMI tested
• Test report available PSR flyback

Typical applications

• USB Type-C AC Adapters for Consumer Electronics
• Adapters and Chargers for Phones and Tablets / Low Power AC to DC SMPS / Industrial and Medical SMPS

More information

• Datasheet
• IC product information