Overview
The VIPER12AS-E, produced by STMicroelectronics, is a low-power offline switched-mode power supply primary switcher. It integrates a dedicated current mode PWM controller and a high voltage power MOSFET on the same silicon chip. This integration makes it highly suitable for various applications requiring efficient and reliable power management.
The device is designed to handle a wide range of input voltages and offers several protective features, making it versatile for use in battery charger adapters, standby power supplies for TVs or monitors, and auxiliary supplies for motor control, among other applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Switching Frequency (FOSC) | 54 | 60 | 66 | kHz |
| VDD Voltage Range | 9 | - | 38 | V |
| Drain-Source Voltage (BVDSS) | - | - | 730 | V |
| Static Drain-Source Resistance (rDS(on)) | 27 | 30 | 54 | Ω |
| Peak Current Limitation (IDlim) | 0.32 | 0.4 | 0.48 | A |
| Junction Operating Temperature (TJ) | -40 | - | 150 | °C |
| Thermal Resistance Junction-Case (RthJC) | - | - | 25 (SO-8), 15 (DIP-8) | °C/W |
| Thermal Resistance Ambient-Case (RthJA) | - | - | 55 (SO-8), 45 (DIP-8) | °C/W |
Key Features
- Fixed 60 kHz Switching Frequency: Ensures consistent and efficient operation.
- Wide VDD Voltage Range (9 V to 38 V): Accommodates changes in auxiliary supply voltage, making it suitable for battery charger adapters and other variable input applications.
- Current Mode Control: Provides precise control over the output current.
- Auxiliary Undervoltage Lockout with Hysteresis: Prevents the device from operating under unsafe voltage conditions.
- High Voltage Start-up Current Source: Enables the device to start up reliably even with high voltage inputs.
- Overtemperature, Overcurrent, and Overvoltage Protection with Auto-Restart: Ensures the device's safety and reliability by automatically restarting after a fault condition is resolved.
- Automatic Burst Mode in Low Load Condition: Reduces power consumption during low load conditions.
- Overvoltage Protection in HICCUP Mode: Protects the device from overvoltage events by entering a hiccup mode until the fault is cleared.
Applications
- Off-line Power Supplies for Battery Charger Adapters: Ideal for charging batteries efficiently and safely.
- Standby Power Supplies for TVs or Monitors: Provides reliable power for standby modes in consumer electronics.
- Auxiliary Supplies for Motor Control: Suitable for motor control applications requiring stable and efficient power supply.
- Other Off-line Power Supply Applications: Can be used in various other off-line power supply scenarios where high reliability and efficiency are required.
Q & A
- What is the switching frequency of the VIPER12AS-E?
The switching frequency is fixed at 60 kHz, with a total variation range of 54 kHz to 66 kHz.
- What is the VDD voltage range for the VIPER12AS-E?
The VDD voltage range is from 9 V to 38 V.
- What type of control does the VIPER12AS-E use?
The VIPER12AS-E uses current mode control.
- What protective features does the VIPER12AS-E have?
The device has overtemperature, overcurrent, and overvoltage protection with auto-restart.
- What is the typical power capability of the VIPER12AS-E?
For European mains (195 - 265 Vac), it is 8 W for SO-8 and 13 W for DIP-8. For US/wide range mains (85 - 265 Vac), it is 5 W for SO-8 and 8 W for DIP-8.
- What is the junction operating temperature range for the VIPER12AS-E?
The junction operating temperature range is from -40°C to 150°C.
- Does the VIPER12AS-E have automatic burst mode?
Yes, it has automatic burst mode in low load conditions to reduce power consumption.
- How does the VIPER12AS-E handle overvoltage events?
The device enters a hiccup mode during overvoltage events and automatically restarts once the fault is cleared.
- What are the common applications of the VIPER12AS-E?
Common 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 thermal resistance junction-case for the VIPER12AS-E?
The thermal resistance junction-case is 25°C/W for SO-8 and 15°C/W for DIP-8.
- Is the VIPER12AS-E RoHS compliant?
Yes, the VIPER12AS-E is RoHS compliant.
