Overview
The VIPER16LDTR, produced by STMicroelectronics, is an off-line converter belonging to the VIPer™ plus family. This device is designed for high-efficiency and reliability in various power supply applications. It features an 800 V avalanche rugged power section, a PWM controller, and several protection mechanisms such as user-defined overcurrent limit, hysteretic thermal shutdown, and safe auto-restart after fault conditions. The VIPER16LDTR is available in a SO16 narrow package and is suitable for use in non-ventilated enclosed adapters and open frame designs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Drain-to-source voltage (VDRAIN) | 800 | V |
| Repetitive avalanche energy (EAV) | 2 | mJ |
| Repetitive avalanche current (IAR) | 1 | A |
| Pulse drain current (IDRAIN) | 2.5 | A |
| Operating frequency (FOSC) | 54-66 kHz (VIPER16L) | kHz |
| Operating frequency (FOSC) | 103-127 kHz (VIPER16H) | kHz |
| Maximum duty cycle (DMAX) | 70-80 % | % |
| Thermal shutdown temperature (TSD) | 150-160 °C | °C |
| Thermal shutdown hysteresis (THYST) | 30 °C | °C |
| Supply voltage range (VDD) | 11.5-23.5 V | V |
| Start-up threshold voltage (VDDon) | 12-14 V | V |
| Under voltage shutdown threshold (VDDoff) | 7-9 V | V |
Key Features
- 800 V Avalanche Rugged Power Section: Ensures high reliability and robustness against voltage spikes.
- PWM Operation with Frequency Jittering: Reduces EMI by spreading the energy of each harmonic over multiple sideband harmonics.
- No Auxiliary Winding Required: Self-biasing function allows the device to power itself directly from the rectified mains.
- Low Standby Power: Less than 30 mW at 230 VAC, meeting energy-saving regulations.
- Adjustable Overcurrent Limitation: User-defined current limitation through an external resistor.
- Soft-Start and Auto-Restart: Progressive increase in drain current during start-up and safe auto-restart after fault conditions.
- Thermal Protection: Hysteretic thermal shutdown to prevent overheating.
- Burst Mode Operation: Low consumption during light load conditions to meet energy efficiency standards.
Applications
- Replacement of Capacitive Power Supplies: Suitable for applications where capacitive power supplies are inadequate.
- Auxiliary Power Supplies for Appliances: Ideal for providing auxiliary power in various household and industrial appliances.
- Power Metering: Used in power metering systems for accurate and efficient power measurement.
- LED Drivers: Can be used to drive LEDs in lighting applications due to its high efficiency and reliability.
Q & A
- What is the maximum drain-to-source voltage of the VIPER16LDTR?
The maximum drain-to-source voltage is 800 V.
- What are the operating frequency ranges for the VIPER16L and VIPER16H versions?
The VIPER16L operates at 54-66 kHz, while the VIPER16H operates at 103-127 kHz.
- How does the VIPER16LDTR handle thermal protection?
The device features hysteretic thermal shutdown with a temperature range of 150-160 °C and a hysteresis of 30 °C.
- What is the purpose of the soft-start function in the VIPER16LDTR?
The soft-start function progressively increases the cycle-by-cycle drain current limit during start-up to prevent inrush currents.
- Can the VIPER16LDTR be powered without an auxiliary winding?
Yes, the device can power itself directly from the rectified mains using its self-biasing function.
- What is the typical standby power consumption of the VIPER16LDTR?
The standby power consumption is less than 30 mW at 230 VAC.
- How does the VIPER16LDTR reduce EMI?
The device uses frequency jittering to spread the energy of each harmonic over multiple sideband harmonics, reducing EMI.
- What is the maximum duty cycle of the VIPER16LDTR?
The maximum duty cycle is 70-80%.
- What are the typical applications of the VIPER16LDTR?
It is used in auxiliary power supplies for appliances, power metering, and LED drivers, among other applications.
- How does the VIPER16LDTR handle overcurrent conditions?
The device has an adjustable overcurrent limitation feature that can be set using an external resistor.
