Overview
The VIPER17LD, produced by STMicroelectronics, is a high-performance, off-line converter IC designed for flyback converters. It features an 800 V rugged power section, PWM control, and various protection mechanisms to ensure reliable and efficient operation. The device is optimized for low standby power consumption and reduced EMI through frequency jittering. It includes advanced features such as soft-start, auto-restart after fault conditions, and hysteresis thermal shutdown.
Key Specifications
| Parameter | Test Condition | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Drain-to-source (ground) voltage (VDRAIN) | - | - | - | 800 | V |
| Repetitive avalanche energy (EAV) | TJ = 150 °C | - | - | 2 | mJ |
| Pulse drain current (IDRAIN) | - | - | - | 2.5 | A |
| Operating frequency (FOSC) | VDD = operating voltage range, VFB = 1 V | 54 | 60 | 66 | kHz (VIPER17L) |
| Operating frequency (FOSC) | VDD = operating voltage range, VFB = 1 V | 103 | 115 | 127 | kHz (VIPER17H) |
| Standby power | 265 VAC | - | - | < 30 | mW |
| Drain-source on state resistance (RDS(on)) | IDRAIN = 0.2 A, VFB = 3 V, VBR = GND, TJ = 25 °C | 20 | 24 | 40 | Ω |
| Overvoltage protection threshold (VOVP) | - | 2.7 | 3 | 3.3 | V |
| Thermal shutdown temperature (TSD) | - | 150 | - | 160 | °C |
Key Features
- 800 V Avalanche Rugged Power Section: Ensures safe operation and high dv/dt capability.
- PWM Operation with Frequency Jittering: Reduces EMI and filter costs.
- Low Standby Power: Less than 30 mW at 265 VAC.
- Adjustable Current Limit and Overvoltage Protection: Enhances safety and reliability.
- On-Board Soft-Start and Auto-Restart: Reduces stress on components and ensures smooth startup.
- Hysteresis Thermal Shutdown: Protects the device from overheating.
- Burst Mode Operation: Optimizes energy efficiency at no load or light load conditions.
- Brown-Out Protection: Safeguards against low input voltage conditions.
Applications
- Adapters for Portable Devices: PDA, camcorders, shavers, cellular phones, videogames.
- Auxiliary Power Supply: For LCD/PDP TVs, monitors, audio systems, computers, industrial systems, LED drivers.
- SMPS for Consumer Electronics: Set-top boxes, DVD players and recorders, white goods.
Q & A
- What is the maximum drain-to-source voltage of the VIPER17LD?
The maximum drain-to-source voltage is 800 V.
- What are the operating frequencies for the VIPER17L and VIPER17H types?
The VIPER17L operates at 54-66 kHz, and the VIPER17H operates at 103-127 kHz.
- How does the VIPER17LD manage standby power consumption?
The device operates in burst mode at no load or light load conditions to minimize standby power consumption to less than 30 mW at 265 VAC.
- What protection mechanisms are built into the VIPER17LD?
The device includes overcurrent protection, overvoltage protection, brown-out protection, and thermal shutdown.
- How does the soft-start feature work in the VIPER17LD?
The soft-start feature gradually increases the drain current during startup to reduce stress on the secondary diode and prevent transformer saturation.
- What is the purpose of the CONT pin in the VIPER17LD?
The CONT pin allows for the adjustment of the current limit set point and output voltage monitoring.
- How does the burst mode operation work in the VIPER17LD?
Burst mode operation stops the power MOSFET from switching when the load decreases, and it restarts switching when the feedback voltage exceeds a certain threshold, optimizing energy efficiency.
- What is the thermal shutdown temperature of the VIPER17LD?
The thermal shutdown temperature is between 150°C and 160°C.
- What types of packages are available for the VIPER17LD?
The device is available in DIP-7, SO16 narrow, and tape and reel packages.
- What are some common applications of the VIPER17LD?
Common applications include adapters for portable devices, auxiliary power supplies for consumer electronics, and SMPS for set-top boxes and white goods.
