Overview
The VIPER37LE, produced by STMicroelectronics, is an offline converter integrated circuit designed for high-performance power management applications. It features an 800 V rugged power section, PWM control, and multiple protection mechanisms including overcurrent, overvoltage, and thermal protection. The device is optimized for low standby power consumption and includes advanced features such as frequency jittering to reduce EMI, burst mode operation, and a brownout function to protect the power supply during low input voltage conditions. The VIPER37LE also includes a high voltage startup circuit and onboard soft-start, ensuring safe and efficient operation.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Drain-to-source (ground) voltage | 800 | V |
| Operating Frequency | 60 kHz (L type), 115 kHz (H type) | kHz |
| Standby Power | 30 mW at 265 VAC | mW |
| Drain Current (nominal) | 1 | A |
| RDS(on) (maximum) | 4.5 | Ω |
| Operating Junction Temperature Range | -40 to 150 | °C |
| Thermal Resistance Junction to Ambient | 100 (SDIP 10 package) | °C/W |
| Package | SDIP 10 |
Key Features
- 800 V avalanche-rugged power MOSFET allowing ultra-wide range input VAC to be achieved
- PWM operation with adjustable limiting current
- Frequency jittering for low EMI
- Output overvoltage protection
- High primary current protection (2nd OCP)
- Input undervoltage setting (brownout)
- Onboard soft-start
- Safe auto-restart after a fault condition
- Hysteretic thermal shutdown
- Burst mode operation for low standby power consumption
Applications
- SMPS for set-top boxes, DVD players and recorders, white goods
- Auxiliary power supply for consumer and home equipment
- ATX auxiliary power supply
- Low / medium power AC-DC adapters
Q & A
- What is the maximum drain-to-source voltage of the VIPER37LE?
The maximum drain-to-source voltage is 800 V.
- What are the operating frequencies of the VIPER37LE?
The operating frequencies are 60 kHz for the L type and 115 kHz for the H type.
- What is the standby power consumption of the VIPER37LE at 265 VAC?
The standby power consumption is 30 mW at 265 VAC.
- What protection mechanisms are included in the VIPER37LE?
The device includes overcurrent protection, overvoltage protection, thermal shutdown, and brownout protection.
- What is the purpose of the frequency jittering feature in the VIPER37LE?
The frequency jittering feature reduces EMI filter costs by spreading the noise spectrum.
- What is the brownout function in the VIPER37LE?
The brownout function protects the switch mode power supply when the rectified input voltage level is below the normal minimum level specified for the system.
- What is the thermal shutdown temperature of the VIPER37LE?
The thermal shutdown temperature is 150°C, with a hysteresis of 30°C.
- What are the typical applications of the VIPER37LE?
Typical applications include SMPS for consumer electronics, auxiliary power supplies, ATX auxiliary power supplies, and low to medium power AC-DC adapters.
- What package types are available for the VIPER37LE?
The VIPER37LE is available in the SDIP 10 package.
- How does the VIPER37LE ensure safe restart after a fault condition?
The device includes a safe auto-restart feature after the removal of any fault condition).
