OBC PFC stage — key device selection
Engineering problem
The PFC front end runs directly from the AC grid through the vehicle inlet: it must reach the required efficiency and power factor, survive surge and mains transients, and keep EMI within limits without oversized filters.
System block diagram
Block list (text version)
- Input protection TVS / surge protection
- Control Digital controller / MCU
- Gate drive Isolated gate driver
- Power stage SiC MOSFET / IGBT
- Sensing Current-sense / isolation amplifier
Input protection
Why this device： Mains surges and load switching on the AC side appear directly at the PFC input.
How to choose： Surge current capability and clamping coordination with the varistor or GDT stage.
| Part number | Brand | Category | Package | Qualification | Operating temperature | Key parameters | Docs | Actions |
|---|---|---|---|---|---|---|---|---|
| 1SMB30CAT3G In stock | onsemi | TVS Diodes | SMB | AEC-Q101 qualified | -55 °C ~ +150 °C | vrwm: 30 V · ppp: 600 W · direction: Uni-directional | Datasheet ↗ | |
| 1.5KE24CA-TP | MCC | Transient Voltage Suppressor | — | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ | |
| 1.5KE250A-TP In stock | MCC | TVS Diodes | DO-201AE | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ | |
| 1.5KE480A | WAYON | Transient Voltage Suppressor | — | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ | |
| 1.5SMC33CA | LITTLEFUSE | Transient Voltage Suppressor | — | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ | |
| 1.5SMC6.8CA In stock | Littelfuse | TVS Diodes | SMC | Qualification to be verified | To be confirmed | To be confirmed | To be confirmed |
Control
Why this device： Implements the PFC control loop, mains synchronisation and protection sequencing.
How to choose： Control-law execution speed and ADC sampling synchronised to the PWM carrier.
| Part number | Brand | Category | Package | Qualification | Operating temperature | Key parameters | Docs | Actions |
|---|---|---|---|---|---|---|---|---|
| MKE04Z8VWJ4 In stock | NXP | Microcontrollers (MCU) | SOIC-20 | AEC-Q100 Grade 1 qualified | -40 °C ~ +125 °C | core: Arm Cortex-M0+ · freq: 48 MHz · flash: 8 KB | Datasheet ↗ | |
| ATMEGA32A-AU In stock | Microchip | Microcontrollers (MCU) | TQFP-44 | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ | |
| ATSAM4S2AA-MU In stock | Microchip | Microcontrollers (MCU) | QFN-48 | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ | |
| BS83A01C In stock | Holtek | Microcontrollers (MCU) | SOT-23-6 | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ | |
| HT66F002/MSOP10 In stock | Holtek | Microcontrollers (MCU) | MSOP-10 | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ | |
| MM32F0010A1N In stock | MindMotion | MCU (Value Line) | QFN-20 | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ |
Sensing
Why this device： Mains current and DC bus voltage feedback for the control loop and protection.
How to choose： Isolation working voltage, CMTI and bandwidth are the deciding parameters here.
| Part number | Brand | Category | Package | Qualification | Operating temperature | Key parameters | Docs | Actions |
|---|---|---|---|---|---|---|---|---|
| INA199B2QDCKRQ1 In stock | TI | Amplifiers & Linear | SOT-SC70-6 | AEC-Q100 Grade 1 qualified | -40 °C ~ +125 °C | supply: 2.7 ~ 26 V · channel: 1 · bw: 105 kHz | Datasheet ↗ | |
| LM2901MX/NOPB In stock | TI | Amplifiers & Linear | SOIC-14 | AEC-Q100 Grade 1 qualified | -40 °C ~ +125 °C | channel: 4 · bw: 1.3 MHz · vos: ±2 mV | Datasheet ↗ | |
| ACE358MTR-E1 In stock | ACE | Operational Amplifiers | SOP-8 | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ | |
| AD822ARZ-REEL7 In stock | ADI | Operational Amplifiers | SOIC-8 | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ | |
| LM258DR2G In stock | onsemi | Operational Amplifiers (Op-Amp) | SOIC-8 | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ | |
| LM2903XK In stock | Runic | Comparators | SOT-23-5 | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ |
Gate drive
Why this device： Drives high-side switches referenced to a switching node hundreds of volts above ground.
How to choose： CMTI, isolation rating and propagation delay matching across channels.
| Part number | Brand | Category | Package | Qualification | Operating temperature | Key parameters | Docs | Actions |
|---|---|---|---|---|---|---|---|---|
| FAN3224TMX In stock | onsemi | Gate Drivers | SOIC-8 | AEC-Q100 Grade 1 qualified | -40 °C ~ +125 °C | channel: 2 · current: 4 A · voltage: 18 V | Datasheet ↗ | |
| CFG2211S Available to order | Chipflow | Gate Drivers | SOP8 | Qualification to be verified | To be confirmed | To be confirmed | To be confirmed | |
| CFG2216M Available to order | Chipflow | Gate Drivers | MSOP10 | Qualification to be verified | To be confirmed | To be confirmed | To be confirmed | |
| CFG2241S Available to order | Chipflow | Gate Drivers | SOP8 | Qualification to be verified | To be confirmed | To be confirmed | To be confirmed | |
| CFG2242D Available to order | Chipflow | Gate Drivers | DFN10-3x3 | Qualification to be verified | To be confirmed | To be confirmed | To be confirmed | |
| CFG2246S Available to order | Chipflow | Gate Drivers | SOP8 | Qualification to be verified | To be confirmed | To be confirmed | To be confirmed |
Power stage
Why this device： The switching leg of the PFC; efficiency at light load and thermal behaviour at full load decide the charger's size.
How to choose： 650 V for single-phase, 1200 V for high-power three-phase; SiC gives efficiency and higher frequency, IGBT lowers BOM cost.
| Part number | Brand | Category | Package | Qualification | Operating temperature | Key parameters | Docs | Actions |
|---|---|---|---|---|---|---|---|---|
| BSC026N02KSGAUMA1 In stock | Infineon | OptiMOS Low-Voltage MOSFETs | SC026 | AEC-Q101 qualified | -55 °C ~ +150 °C | channel: N · vds: 25 V · id: 100 A | Datasheet ↗ | |
| C3D08065I In stock | CREE | SiC Schottky Diodes | TO-220-2 Isolated | AEC-Q101 qualified | -55 °C ~ +150 °C | vds: 650 V · id: 8 A · rds: — | Datasheet ↗ | |
| 2N7002-TP In stock | MCC | Small-Signal MOSFETs | SOT-23 | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ | |
| 2N7002DW-TP In stock | MCC | Small-Signal MOSFETs | SOT-363 | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ | |
| 2N7002E-7-F In stock | Diodes | Small-Signal N-Channel MOSFETs | SOT-23 | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ | |
| 2N7002K-TP In stock | MCC | Small-Signal MOSFETs | SOT-23 | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ |
Key selection parameters
| AC input | Single-phase 230 V / three-phase 400 V |
| Output power | 3.3 kW / 6.6 kW / 11 kW / 22 kW |
| DC bus voltage | 400 V or 800 V platform |
| Switching frequency | 40–150 kHz depending on device |
| Efficiency target | Peak ≥ 95% typical requirement |
FAQ
Does SiC always pay off in the PFC stage?
Not always. It pays off where efficiency targets, size or high switching frequency dominate; at lower power with relaxed targets, a super-junction MOSFET bridge can be the better value.
Related
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