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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
- Auxiliary power supply for consumer and home equipments
- ATX auxiliary power supply
- Low / medium power AC-DC adapters
More information
Products
| Order Code | Datasheet | Simulation | Downloads | Product series | VIN | VOut1 (V) | IOut1 (A) | Vaux (V) | Vaux 1 (V) | fswitch (kHz) | L (µH) | NPRI : NSEC : NAUX | VT (V (AC)) | L (mm) | W (mm) | H (mm) | Mount | Size | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC (mΩ) | fres (MHz) | Material | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 750871012 | SPEC | 4 files | MID-OLSTM Offline Flyback Transformers for STMicroelectronics | 85 - 272 V (AC) | 5 | 2.4 | 14 | 14 | 50 - 140 | 900 | 14.7:1:1:2.8 | 4500 | 20.32 | 24.38 | 16 | THT | EE16/8/5 | – | – | – | – | – | – | ||
 | 7443552150 | SPEC | 8 files | WE-HCI SMT Flat Wire High Current Inductor | – | – | – | – | – | – | 1.5 | – | – | 10.5 | 10.2 | 4 | SMT | 1040 | 18 | 6.5 | 17 | 5.3 | 63 | WE-PERM |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 750871012 | SPEC | |
| 7443552150 | SPEC |
| Samples |
|---|
| Order Code | Datasheet | Simulation | Downloads | Product series | VIN | VOut1 (V) | IOut1 (A) | Vaux (V) | Vaux 1 (V) | fswitch (kHz) | L (µH) | NPRI : NSEC : NAUX | VT (V (AC)) | L (mm) | W (mm) | H (mm) | Mount | Size | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC (mΩ) | fres (MHz) | Material | Samples |
|---|