Overview
The VIPER22AS-E, produced by STMicroelectronics, is a low power off-line SMPS (Switch-Mode Power Supply) primary switcher. This component integrates a dedicated current mode PWM (Pulse Width Modulation) controller and a high voltage power MOSFET on the same silicon chip. This integration makes it highly suitable for various power supply applications, including battery charger adapters, standby power supplies for TVs or monitors, and auxiliary supplies for motor control.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Switching Drain Source Voltage (VDS) | -0.3 to 730 | V |
| VDD Start-up Threshold (VDDon) | 14.5 | V |
| VDD Start-up Threshold Hysteresis (VDDhyst) | 5.8 to 7.2 | V |
| VDD Overvoltage Threshold (VDDovp) | 38 to 46 | V |
| Oscillator Frequency | 54 to 66 | kHz |
| Peak Current Limitation | 0.56 to 0.84 | A |
| Thermal Shutdown Temperature | 140 to 170 | °C |
| Thermal Shutdown Hysteresis | 40 | °C |
| Output Current | 0.7 | A |
| Operating Temperature | -40 to 150 | °C |
Key Features
- Current Mode Control: The device operates in current mode, providing a stable output voltage.
- High Voltage Start-up Current Source: Ensures reliable start-up even with high input voltages.
- Overtemperature, Overcurrent, and Overvoltage Protection: Includes auto-restart functionality for enhanced reliability.
- Auxiliary Undervoltage Lockout with Hysteresis: Prevents the device from operating under unsafe voltage conditions.
- Automatic Burst Mode in Low Load Conditions: Reduces power consumption during low load states.
- Wide Range of VDD Voltage: Accommodates changes in auxiliary supply voltage, making it suitable for battery charger adapter configurations.
Applications
- Off-line Power Supplies: Suitable for battery charger adapters and other off-line power supply applications.
- Standby Power Supplies: Ideal for TVs, monitors, and other consumer electronics requiring standby power.
- Auxiliary Supplies for Motor Control: Used in motor control systems where reliable and efficient power supply is crucial.
Q & A
- What is the VIPER22AS-E?
The VIPER22AS-E is a low power off-line SMPS primary switcher that combines a current mode PWM controller and a high voltage power MOSFET on the same silicon chip.
- What are the key applications of the VIPER22AS-E?
Key applications include off-line power supplies for battery charger adapters, standby power supplies for TVs or monitors, and auxiliary supplies for motor control.
- What is the switching frequency of the VIPER22AS-E?
The switching frequency is fixed at 60 kHz, with a total variation range of 54 to 66 kHz.
- What protection features does the VIPER22AS-E have?
The device includes overtemperature, overcurrent, and overvoltage protection with auto-restart functionality.
- What is the operating temperature range of the VIPER22AS-E?
The operating temperature range is -40 to 150°C.
- How does the VIPER22AS-E handle low load conditions?
The device operates in automatic burst mode during low load conditions to reduce power consumption.
- What is the peak current limitation of the VIPER22AS-E?
The peak current limitation is between 0.56 and 0.84 A.
- How does the VIPER22AS-E handle start-up?
The device includes a high voltage start-up current source that ensures reliable start-up even with high input voltages.
- What is the VDD start-up threshold (VDDon) of the VIPER22AS-E?
The VDD start-up threshold (VDDon) is typically 14.5 V.
- How does the VIPER22AS-E handle overvoltage conditions?
The device has an overvoltage detector that resets the device when VDD exceeds the overvoltage threshold (VDDovp), and it resumes normal operation automatically once the voltage drops below VDDoff.
