Overview
The VIPER12AS, produced by STMicroelectronics, is a low-power offline switched-mode power supply primary switcher. It combines a dedicated current mode PWM controller with a high voltage power MOSFET on the same silicon chip. This integration provides a compact and efficient solution for various power supply applications.
The device is designed to handle a wide range of input voltages and offers several protective features, making it suitable for use in battery charger adapters, standby power supplies for TVs or monitors, and auxiliary supplies for motor control.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Drain-Source Voltage (BVDSS) | 730 | - | - | V |
| Drain Current (ID) | - | 0.4 | - | A |
| Static Drain-Source ON State Resistance (rDS(on)) | 27 | 30 | 54 | Ω |
| Oscillator Frequency (FOSC) | 54 | 60 | 66 | kHz |
| VDD Voltage Range | 9 | - | 38 | V |
| Operating Temperature Range | -40 | - | 150 | °C |
| Thermal Shutdown Temperature (TSD) | 140 | 170 | - | °C |
Key Features
- Fixed 60 kHz switching frequency
- 9 V to 38 V wide range VDD voltage
- Current mode control
- Auxiliary undervoltage lockout with hysteresis
- High voltage start-up current source
- Overtemperature, overcurrent, and overvoltage protection with auto-restart
- Automatic burst mode in low load condition
- Overvoltage protection in HICCUP mode
Applications
The VIPER12AS is typically used in various applications including:
- Off-line power supplies for battery charger adapters
- Standby power supplies for TVs or monitors
- Auxiliary supplies for motor control
Q & A
- What is the switching frequency of the VIPER12AS?
The switching frequency of the VIPER12AS is fixed at 60 kHz.
- What is the range of the VDD voltage for the VIPER12AS?
The VDD voltage range for the VIPER12AS is from 9 V to 38 V.
- What type of control does the VIPER12AS use?
The VIPER12AS uses current mode control.
- What kind of protective features does the VIPER12AS have?
The VIPER12AS has overtemperature, overcurrent, and overvoltage protection with auto-restart.
- What is the typical power capability of the VIPER12AS in European mains?
The typical power capability of the VIPER12AS in European mains (195 - 265 Vac) is 8 W for SO-8 and 13 W for DIP-8 packages.
- What is the operating temperature range of the VIPER12AS?
The operating temperature range of the VIPER12AS is from -40°C to 150°C).
- Does the VIPER12AS have automatic burst mode in low load conditions?
- What is the thermal shutdown temperature of the VIPER12AS?
The thermal shutdown temperature of the VIPER12AS is typically 170°C).
- What is the purpose of the VDD pin on the VIPER12AS?
The VDD pin is the power supply of the control circuits and also provides a charging current during start-up).
- What kind of packages are available for the VIPER12AS?
The VIPER12AS is available in SO-8 and DIP-8 packages).
