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STMicroelectronics Viper27HN | Demoboard STEVAL-ISA147V3
500 W fully digital AC-DC power supply (D-SMPS) based on STM32F334C8 microcontroller
Overview
| Topology | Flyback Converter |
| Switching frequency | 103-127 kHz |
| IC revision | 5 |
Description
The STEVAL-ISA147V3 is a digital switch mode AC-DC converter consisting of two power stages: an input semi-bridgeless power factor corrector (SBPFC) controlled by an STM32F051K8, and a regulation stage implemented with an LLC half bridge with synchronous rectification (SR), controlled by an STM32F334C8 microcontroller.This 500 W AC-DC converter uses the so-called bridgeless PFC topology, with the advantage of lower conduction losses and higher efficiency by eliminating the need for a diode rectifier stage. This choice also allows a reduced component count compared to a standard PFC.The input stage is typically controlled using an outer voltage loop for bus voltage regulation and an inner control loop to shape the current according to a sinusoidal waveform. The outer loop adjusts the current reference in order to maintain a regulated bus voltage, independent of load or input voltage variations. The output isolation and regulation stage is implemented using a half-bridge LLC topology, operating with constant duty cycle and variable frequency control.
Features
Input AC voltage: 90 V to 264 V
- Input AC frequency: 45 Hz to 65 Hz
- Nominal power: 500 W
- Output voltage: 12 V
- Semi-Bridgeless PFC stage
- DC-DC stage: resonant LLC with synchronous rectification
- Peak efficiency: 94%
- PFC switching frequency: 60 kHz
- DC-DC switching frequency: 80 kHz to 115 kHz (burst mode above)
- HF transformer isolation voltage: 4 kV
- Cooling: natural convection up to 300 W, forced cooling above 300 W
- PFC control: managed by STM32F051K8
- LLC control: managed by STM32F334C8
- Input short-circuit protection
- Input under/overvoltage protection
- Input under/overfrequency protection
- DC Bus under/overvoltage protection
- Output short-circuit protection
- Output under/overvoltage protection
- Overtemperature protection
- RoHS compliant
Typical applications
- SMPS for set-top boxes, DVD players and recorders, white goods
- Low / medium power AC-DC adapters
- Auxiliary power supply for consumer and home equipments
- ATX auxiliary power supply
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | VT(V (AC)) | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC(mΩ) | fres(MHz) | Material | VIN | VOut1(V) | IOut1(A) | Vaux(V) | fswitch(kHz) | NPRI : NSEC : NAUX | L(mm) | W(mm) | H(mm) | Mount | Size | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-HCI SMT Flat Wire High Current Inductor, 1.5 µH, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance1.5 µH | – | Performance Rated Current18 A | Saturation Current @ 10%6.5 A | Saturation Current @ 30%17 A | DC Resistance5.3 mΩ | Self Resonant Frequency63 MHz | MaterialWE-PERM | – | – | – | – | – | – | Length10.5 mm | Width10.2 mm | Height4 mm | MountSMT | Size1040 | ||||
 | WE-OLSTM Offline Flyback Transformers, 900 µH, 4500 V (AC) | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-OLSTM Offline Flyback Transformers | Inductance900 µH | Insulation Test Voltage4500 V (AC) | – | – | – | – | – | – | Input Voltage 85 - 272 V (AC) | Output Voltage 15 V | Output Current 12.4 A | Auxiliary Voltage14 V | Switching Frequency 50 - 140 | Turns Ratio14.75:1:2.75 | Length20.32 mm | Width24.38 mm | Height16 mm | MountTHT | SizeEE16/8/5 |