Overview
The UCC28730DR, manufactured by Texas Instruments, is a highly efficient, primary-side regulated (PSR) flyback controller designed for isolated power supply applications. This component eliminates the need for an optocoupler by utilizing a unique control algorithm to provide constant voltage (CV) and constant current (CC) regulation. It is particularly suited for low-power standby applications, offering a zero-power standby mode with less than 5mW power consumption. The UCC28730DR is widely used in adapters, chargers, and auxiliary power supplies for consumer electronics, industrial automation, and home appliances.
Key Specifications
| Parameter | Value | Unit | Notes |
|---|---|---|---|
| Control Mode | Primary-Side Regulation (PSR) | - | Eliminates need for optocoupler |
| Switching Frequency (Max) | 83 | kHz | - |
| UVLO Thresholds (On/Off) | 21/7 | V | - |
| Operating Temperature Range | -40 to 125 | °C | - |
| Startup Voltage | 700 | V | High-voltage startup switch |
| Output Voltage Regulation | ±5% | - | Line and load regulation |
| Package | SOIC-7 | - | Compact form factor |
Key Features
- Primary-side regulation eliminates the need for an optocoupler, reducing system complexity and cost.
- Supports zero-power standby mode with less than 5mW power consumption.
- Integrated 700V startup switch for reliable operation.
- Comprehensive protection features including overvoltage, undervoltage, and overcurrent protection.
- Frequency dithering to ensure EMI compliance.
Applications
The UCC28730DR is ideal for a variety of applications, including:
- Consumer Electronics: Smartphone and tablet adapters, chargers, and auxiliary power supplies.
- Industrial Automation: Low-power standby and auxiliary power supplies for industrial equipment.
- Home Appliances: Power supplies for TVs, monitors, and other household devices.
- SMPS: Switch-mode power supplies requiring high efficiency and low standby power.
Q & A
1. What is the primary advantage of the UCC28730DR?
The UCC28730DR eliminates the need for an optocoupler through its primary-side regulation (PSR) feature, reducing system complexity and cost.
2. What is the maximum switching frequency of the UCC28730DR?
The maximum switching frequency is 83 kHz.
3. What is the operating temperature range of the UCC28730DR?
It operates within a temperature range of -40°C to 125°C.
4. Does the UCC28730DR support low-power standby mode?
Yes, it supports zero-power standby mode with less than 5mW power consumption.
5. What protection features are included in the UCC28730DR?
It includes overvoltage, undervoltage, and overcurrent protection.
6. What is the startup voltage of the UCC28730DR?
The startup voltage is 700V, provided by an integrated high-voltage startup switch.
7. What package does the UCC28730DR come in?
It is available in a compact SOIC-7 package.
8. Is the UCC28730DR suitable for industrial applications?
Yes, it is widely used in industrial automation for low-power standby and auxiliary power supplies.
9. How does the UCC28730DR ensure EMI compliance?
It uses frequency dithering to reduce EMI emissions.
10. Can the UCC28730DR be used in consumer electronics?
Yes, it is commonly used in smartphone and tablet adapters, chargers, and other consumer electronics power supplies.
