Overview
The VIPER06LSTR, produced by STMicroelectronics, is an offline converter designed for high-voltage applications. It features an 800 V avalanche rugged power section, a PWM controller, and various protection mechanisms such as user-defined overcurrent limits, open-loop failure protection, and hysteretic thermal protection. The device can power itself directly from the rectified mains, eliminating the need for an auxiliary bias winding. It also incorporates advanced frequency jittering to reduce EMI filter costs and operates in burst mode to meet energy-saving regulations.
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 | 60 kHz (VIPER06Lx) | kHz |
| Standby power at 265 VAC | < 30 mW | mW |
| Thermal shutdown temperature (TSD) | 150-160 | °C |
| Thermal shutdown hysteresis (THYST) | 30 | °C |
| Soft-start time (tSS) | 8.5 ms | ms |
| Restart time after fault (tRESTART) | 1 s | s |
Key Features
- 800 V avalanche rugged power section
- PWM operation with frequency jittering for low EMI
- No need for an auxiliary winding in low-power applications
- Standby power < 30 mW at 265 VAC
- Limiting current with adjustable set point
- On-board soft-start
- Safe auto-restart after a fault condition
- Hysteretic thermal shutdown
Applications
- Replacement of capacitive power supplies
- Home appliances
- Power metering
- LED drivers
Q & A
- What is the maximum drain-to-source voltage of the VIPER06LSTR?
The maximum drain-to-source voltage is 800 V.
- What are the operating frequencies for the VIPER06Lx series?
The operating frequency for the VIPER06Lx series is 60 kHz.
- Does the VIPER06LSTR require an auxiliary bias winding?
No, it can power itself directly from the rectified mains, eliminating the need for an auxiliary bias winding.
- What is the standby power consumption at 265 VAC?
The standby power consumption is less than 30 mW at 265 VAC.
- How does the VIPER06LSTR handle thermal protection?
The device features hysteretic thermal shutdown with a thermal shutdown temperature between 150-160°C and a hysteresis of 30°C.
- What is the purpose of the soft-start feature in the VIPER06LSTR?
The soft-start feature progressively increases the cycle-by-cycle drain current limit during startup, reducing stress on the secondary diode and preventing transformer saturation.
- How does the VIPER06LSTR handle fault conditions?
The device features safe auto-restart after any fault condition, with a restart time of 1 second.
- Can the current limit be adjusted in the VIPER06LSTR?
- What is the typical soft-start time for the VIPER06LSTR?
The typical soft-start time is 8.5 ms.
- What are some common applications for the VIPER06LSTR?
