Overview
The VIPER26HN is a smart high voltage converter from STMicroelectronics, integrating an 800 V avalanche-rugged power MOSFET with PWM current mode control. This device is designed to meet stringent energy-saving standards, offering very low power consumption and burst mode operation under light load conditions. It supports the design of flyback, buck, and buck-boost converters, making it versatile for various power supply applications.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Transistor Breakdown Voltage (V) | 800 | - | - | V |
| Drain Current (A) | - | 0.7 | - | A |
| RDS(on) (Ω) | - | - | 7 | Ω |
| Switching Frequency | 103 | 115 | 127 | kHz |
| Modulation Depth | - | - | ±8 kHz | - |
| Junction Temperature Range | -40 | - | 150 | °C |
| Power Dissipation @ Tamb < 60°C (SO16N) | - | - | 1.5 | W |
Key Features
- 800 V avalanche rugged power MOSFET allowing a wide range of VAC input to be covered
- Embedded HV startup and sense-FET
- Current mode PWM controller
- Minimized system input power consumption: less than 30 mW @ 230 VAC in no-load condition and less than 400 mW @ 230 VAC with 250 mW load
- Limiting current with adjustable set point
- Jittered switching frequency to reduce EMI filter cost: 115 kHz ±8 kHz
- Embedded error amplifier
- Hysteretic thermal shutdown
- Built-in soft-start for improved system reliability
- Protections with automatic restart: overload/short-circuit (OLP), feedback loop disconnection
Applications
- Auxiliary power supply for appliances
- Power metering
- LED drivers
- SMPS for set-top boxes, DVD players, and recorders
Q & A
- What is the breakdown voltage of the power MOSFET in the VIPER26HN?
The breakdown voltage of the power MOSFET is 800 V.
- What are the typical switching frequencies of the VIPER26HN?
The switching frequency is internally fixed at 115 kHz with a modulation depth of ±8 kHz.
- What is the maximum drain current of the VIPER26HN?
The maximum drain current is approximately 0.7 A.
- What is the RDS(on) of the power MOSFET in the VIPER26HN?
The RDS(on) is typically 7 Ω.
- What are the key protections included in the VIPER26HN?
The device includes protections with automatic restart for overload/short-circuit (OLP) and feedback loop disconnection.
- How does the soft-start function work in the VIPER26HN?
The soft-start function progressively increases the cycle-by-cycle drain current limit up to the default value, reducing stress on the secondary diode during start-up.
- What is the purpose of the high-voltage current generator in the VIPER26HN?
The high-voltage current generator is used for startup, sourcing current to charge the VDD capacitor until the power section starts switching.
- What are the typical applications of the VIPER26HN?
Typical applications include auxiliary power supplies for appliances, power metering, LED drivers, and SMPS for set-top boxes, DVD players, and recorders.
- How does the VIPER26HN reduce EMI?
The VIPER26HN reduces EMI through a jittered switching frequency, spreading the energy of each harmonic over a number of sideband harmonics.
- What is the thermal shutdown temperature threshold of the VIPER26HN?
The thermal shutdown temperature threshold is 150 °C with a hysteresis of 30 °C.
