Overview
The VIPER20A-E, produced by STMicroelectronics, is a Switch-Mode Power Supply (SMPS) primary integrated circuit designed for offline power supplies. It combines a state-of-the-art Pulse Width Modulation (PWM) circuit with an optimized, high-voltage Vertical Power MOSFET on the same silicon chip. This integration is achieved using the VIPower M0 Technology, which enhances performance and reduces component count compared to discrete solutions.
The device is particularly suited for applications requiring high efficiency and low standby power consumption, making it compliant with the German 'Blue Angel' norm for less than 1W total power consumption in standby mode.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| VDS (Continuous Drain-Source Voltage) | -0.3 to 700 | V |
| ID (Maximum Current) | Internally limited | A |
| VDD (Supply Voltage) | 0 to 15 | V |
| VOSC (Voltage Range Input) | 0 to VDD | V |
| VCOMP (Voltage Range Input) | 0 to 5 | V |
| ICOMP (Maximum Continuous Current) | ±2 mA | mA |
| VDSS (Drain-Source Voltage) | 700 V | V |
| RDS(on) (Static Drain-Source On Resistance) | 15.5 to 32 Ω | Ω |
| TJ (Junction Operating Temperature) | Internally limited | °C |
| TSTG (Storage Temperature) | -65 to 150 | °C |
| PTOT (Power Dissipation at TC= 25°C) | 57 W | W |
Key Features
- Adjustable Switching Frequency: Up to 200 kHz, set by an Rt-Ct network connected to the OSC pin.
- Current Mode Control: Uses an inner current control loop and an outer voltage control loop for excellent line regulation and dynamic stability.
- Soft Start and Shutdown Control: Implemented through the COMP pin, allowing for smooth start-up and shutdown operations.
- Automatic Burst Mode Operation: In standby conditions, reducing total power consumption to less than 1W to meet the German 'Blue Angel' norm.
- Internally Trimmed Zener Reference: Provides a stable voltage reference.
- Undervoltage Lock-Out (UVLO): With hysteresis to prevent operation below a certain voltage threshold.
- Integrated Start-Up Supply: High voltage current source for start-up phase.
- Over-Temperature Protection: Automatically shuts down the device at high junction temperatures and restarts when the temperature decreases.
- Low Standby Current: Minimized power consumption in standby mode.
- Adjustable Current Limitation: Peak current limitation to protect the device.
Applications
The VIPER20A-E is suitable for various offline power supply applications, including:
- Offline Power Supplies: With secondary power capabilities of up to 10W in wide range conditions and up to 20W in single range or with doubler configuration.
- Primary or Secondary Regulation Loops: Compatible with both primary and secondary regulation loops, reducing component count by about 50% compared to discrete solutions.
- Standby Power Supplies: Ideal for applications requiring low standby power consumption, such as consumer electronics and appliances.
Q & A
- What is the maximum drain-source voltage of the VIPER20A-E?
The maximum drain-source voltage (VDS) is 700V.
- What is the typical switching frequency range of the VIPER20A-E?
The switching frequency can be adjusted up to 200 kHz using an Rt-Ct network connected to the OSC pin.
- How does the VIPER20A-E manage over-temperature conditions?
The device has an over-temperature protection feature that shuts down the device at a junction temperature of typically 170°C and restarts when the temperature decreases by 40°C.
- What is the purpose of the COMP pin in the VIPER20A-E?
The COMP pin serves as the output of the error transconductance amplifier and allows for the connection of a compensation network. It also controls the soft start and shutdown operations.
- How does the VIPER20A-E achieve low standby power consumption?
The device operates in an automatic burst mode in standby conditions, reducing total power consumption to less than 1W to meet the German 'Blue Angel' norm.
- What is the role of the integrated start-up supply in the VIPER20A-E?
The integrated start-up supply provides a high voltage current source during the start-up phase, which is switched off during normal operation.
- Can the VIPER20A-E be used in both primary and secondary regulation loops?
Yes, the VIPER20A-E is compatible with both primary and secondary regulation loops, despite using around 50% fewer components compared to discrete solutions).
- What is the typical static drain-source on resistance (RDS(on)) of the VIPER20A-E?
The typical static drain-source on resistance (RDS(on)) is 18 Ω).
- How does the VIPER20A-E handle undervoltage conditions?
The device has an undervoltage lock-out (UVLO) feature with hysteresis to prevent operation below a certain voltage threshold).
- What is the storage temperature range for the VIPER20A-E?
The storage temperature range is -65 to 150°C).
