Overview
The VIPER20A-E is a high-performance Power Management IC (PMIC) designed by STMicroelectronics, optimized for offline switch-mode power supplies. It combines a state-of-the-art PWM (Pulse Width Modulation) circuit with an optimized high-voltage Vertical Power MOSFET on the same silicon chip, utilizing VIPower M0 Technology. This IC is particularly suited for applications requiring high efficiency, reliability, and low component count. It supports both primary and secondary regulation loops and is compatible with various configurations, including single range and doubler configurations, making it versatile for different power supply designs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Continuous Drain-Source Voltage (VDS) | –0.3 to 700 | V |
| Maximum Current (ID) | Internally limited | A |
| Supply Voltage (VDD) | 0 to 15 | V |
| Switching Frequency | Up to 200 kHz | |
| Static Drain-Source On Resistance (RDS(on)) | 15.5 to 32 Ω | Ω |
| Power Dissipation at TC= 25°C (PTOT) | 57 W | W |
| Junction Operating Temperature (TJ) | Internally limited | °C |
| Storage Temperature (TSTG) | –65 to 150 | °C |
| Thermal Shutdown Temperature (Ttsd) | 140 to 190 | °C |
Key Features
- Current Mode Control: The VIPER20A-E uses a current mode control method with an inner current control loop and an outer voltage control loop, ensuring excellent line and dynamic regulation.
- Soft Start and Shutdown Control: Features soft start and shutdown capabilities, including automatic burst mode operation in stand-by conditions to meet the German 'Blue Angel' norm (<1W total power consumption).
- Over-Temperature Protection: Includes over-temperature protection with a minimum junction temperature of 140°C and a typical restart temperature 40°C below the shutdown value.
- Undervoltage Lock-Out with Hysteresis: Provides undervoltage lock-out with hysteresis to ensure stable operation.
- Integrated Start-Up Supply: An integrated high-voltage current source provides bias current during start-up.
- Transconductance Error Amplifier: Includes a transconductance error amplifier with a typical transconductance of 1.5 mA/V.
- Adjustable Current Limitation and Switching Frequency: Supports adjustable current limitation and switching frequency up to 200 kHz.
Applications
The VIPER20A-E is typically used in offline power supplies with secondary power capabilities ranging from 10W in wide range conditions to 20W in single range or doubler configurations. It is suitable for various applications, including:
- Offline switch-mode power supplies.
- Low to medium power AC-DC converters.
- Power supplies requiring high efficiency and low standby power consumption.
- Applications needing primary or secondary regulation loops.
Q & A
- What is the maximum continuous drain-source voltage of the VIPER20A-E?
The maximum continuous drain-source voltage (VDS) is –0.3 to 700 V. - What is the typical switching frequency range of the VIPER20A-E?
The switching frequency range is up to 200 kHz. - Does the VIPER20A-E have over-temperature protection?
Yes, it includes over-temperature protection with a minimum junction temperature of 140°C. - How does the VIPER20A-E handle start-up?
The VIPER20A-E has an integrated high-voltage current source that provides bias current during start-up. - What is the purpose of the COMP pin in the VIPER20A-E?
The COMP pin is the output of the error transconductance amplifier and allows for the connection of a compensation network to adjust the regulation loop bandwidth. - Can the VIPER20A-E operate in burst mode?
Yes, it can operate in automatic burst mode in stand-by conditions to meet low power consumption standards. - What is the thermal resistance junction-to-ambient (RthJA) of the VIPER20A-E?
The thermal resistance junction-to-ambient (RthJA) is up to 20 °C/W. - Is the VIPER20A-E suitable for primary or secondary regulation loops?
Yes, it is compatible with both primary and secondary regulation loops. - What is the typical power dissipation at TC= 25°C for the VIPER20A-E?
The typical power dissipation at TC= 25°C is 57 W. - Does the VIPER20A-E have undervoltage lock-out with hysteresis?
Yes, it includes undervoltage lock-out with hysteresis to ensure stable operation.
