Overview
The UCC28722DBVR is a flyback power supply controller produced by Texas Instruments. This device is designed to provide accurate voltage and constant current regulation with primary-side feedback, eliminating the need for opto-coupler feedback circuits. It operates in discontinuous conduction mode with valley-switching to minimize switching losses and features a combination of frequency and primary peak current modulation for high conversion efficiency across the load range. The controller is particularly suited for USB-compliant adapters and chargers, as well as other consumer electronics, due to its low component count and cost-effective design.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | SOT-23-6 (DBV) | - |
| Package Size | 2.90 mm × 1.60 mm | mm |
| Operating Voltage Range (VDD) | 9 V to 35 V | V |
| UVLO Turnon Threshold | 21 V | V |
| UVLO Turnoff Threshold | 7.7 V | V |
| Maximum Switching Frequency | 80 kHz | kHz |
| Minimum Switching Frequency | 650 Hz | Hz |
| Internal Over-Temperature Protection Threshold | 165°C | °C |
| Primary Peak Current Control | Cycle-by-cycle | - |
Key Features
- Primary-Side Feedback: Eliminates the need for opto-coupler feedback circuits, reducing component count and cost.
- Valley Switching: Reduces switching losses, induced EMI, and minimizes turn-on current spikes.
- Frequency and Primary Peak Current Modulation: Provides high conversion efficiency across the load range.
- Comprehensive Fault Protection: Includes output over-voltage, input under-voltage, internal over-temperature, primary over-current, and VS pin faults.
- Cable Compensation: Adjustable compensation for voltage drop in the cable.
- Low Standby Power: Achieves less than 75 mW of standby power, making it suitable for energy-efficient designs.
Applications
- USB-Compliant Adapters and Chargers: Meets the requirements for constant voltage and constant current output regulation.
- Consumer Electronics: Suitable for smart phones, tablet computers, cameras, and other portable devices.
- Standby Supply for TVs and Desktops: Efficient operation in low-power modes.
- White Goods: Can be used in various household appliances.
Q & A
- What is the primary function of the UCC28722DBVR?
The UCC28722DBVR is a flyback power supply controller designed to provide accurate voltage and constant current regulation with primary-side feedback.
- What is the operating voltage range of the UCC28722DBVR?
The operating voltage range is from 9 V to 35 V.
- What is the maximum switching frequency of the UCC28722DBVR?
The maximum switching frequency is 80 kHz.
- Does the UCC28722DBVR require an opto-coupler for feedback?
No, it uses primary-side feedback, eliminating the need for an opto-coupler.
- What kind of fault protection does the UCC28722DBVR offer?
The device includes output over-voltage, input under-voltage, internal over-temperature, primary over-current, and VS pin faults protection.
- How does the UCC28722DBVR manage standby power?
The device achieves less than 75 mW of standby power, making it energy-efficient.
- What is the purpose of valley switching in the UCC28722DBVR?
Valley switching reduces switching losses, induced EMI, and minimizes turn-on current spikes.
- Can the UCC28722DBVR be used for cable compensation?
- What are some common applications of the UCC28722DBVR?
It is commonly used in USB-compliant adapters and chargers, consumer electronics, and standby supplies for TVs and desktops.
- What is the internal over-temperature protection threshold of the UCC28722DBVR?
The internal over-temperature protection threshold is 165°C.
