Power Devices for LED Drivers and Lighting Power Supplies
Super junction MOSFETs, fast recovery diodes and bridge rectifiers for isolated and non-isolated LED drivers, from 5 W bulbs to 200 W outdoor luminaires.
An LED driver is a current source, not a voltage source, so its devices are chosen for the current loop and the thermal environment rather than for output voltage alone. OCENME supplies 500–650 V MOSFETs, fast recovery diodes and bridge rectifiers for isolated flyback, non-isolated buck and PFC boost LED drivers from 5 W to 200 W.
Scope of supply in this sector
This page covers drivers for general lighting, outdoor and industrial luminaires, and horticultural lighting from 5 W to 200 W. It does not cover the LED load itself, driver IC selection or dimming protocol implementation.
Requirements
| Power range | 5 W to 200 W |
|---|---|
| Primary switch | 500–650 V super junction or planar MOSFET |
| Output rectifier | Fast recovery diode 200–600 V, or SiC Schottky above 100 kHz |
| Input bridge | 1 A to 4 A, in-line package, 600–1000 V |
| Ambient | Ta up to 60 °C inside a sealed luminaire housing |
| Lifetime target | 25,000 to 50,000 hours at rated case temperature |
| Flicker | Below 5% at rated output for most commercial specifications |
Materials we machine for this sector
- Silicon super junction die
- Epitaxial fast recovery die
- GPP bridge die
- UL 94V-0 mould compound
Applicable standards
- IEC 61347-1 and IEC 61347-2-13 for LED driver safety
- EN 55015 / CISPR 15 for lighting EMI
- IEC 61000-3-2 Class C harmonic limits above 25 W
- ENERGY STAR and DLC requirements for luminaires (end product)
Typical parts
- 650 V super junction MOSFET, 150 mΩ to 550 mΩ, TO-252 and TO-220F
- 500 V planar MOSFET for cost-sensitive non-isolated buck drivers
- 600 V fast recovery diode for output rectification below 100 kHz
- 650 V SiC Schottky diode where switching frequency exceeds 100 kHz
- Bridge rectifier 1 A to 4 A, MBF, ABS, KBP
Quality risks specific to this sector
These are the failure modes we see most often in this industry. They are listed because knowing them before design review is cheaper than discovering them at first article.
- Junction temperature estimated from ambient rather than measured inside the sealed housing, so the driver runs 20 °C hotter than the calculation
- Electrolytic capacitor life, not the MOSFET, sets driver lifetime — a device with a 150 °C rating does not fix a 105 °C capacitor
- Output rectifier chosen for average current while the peak current in deep continuous mode is twice as high
- Flicker performance compromised by a fast recovery diode with too much reverse recovery at low output current
Compliance and capability questions
Why do LED drivers fail more often than the LEDs they power?
Because the driver contains the electrolytic capacitors and the hottest small-signal parts. A 50,000-hour LED with a driver whose capacitor is rated 5,000 hours at 105 °C will fail at the driver first. When a lighting customer asks for a longer warranty, the honest answer is usually a capacitor and thermal redesign, not a better MOSFET.
Is a super junction MOSFET always better than planar in a LED driver?
No. In a 10 W non-isolated buck running at 60 kHz, a 500 V planar part is cheaper and the efficiency difference is under half a percent. Super junction earns its price above roughly 40 W, or where the driver is thermally constrained and every point of efficiency buys case temperature.
What diode should rectify the output of a 150 W outdoor driver?
At 150 W with a 60–100 kHz flyback, a 600 V fast recovery diode is normally sufficient and cheapest. Above 100 kHz, or where the diode contributes measurable loss, a 650 V SiC Schottky removes reverse recovery and is worth the cost. The worst choice is a standard recovery diode: it will work, and it will run hot.
Do you supply parts for dimmable drivers?
The devices are the same; the dimming behaviour comes from the driver IC and the control loop. Where phase-cut dimming is required, keep the input bridge and the primary switch cool, because dimming at low output means low duty cycle and high peak current, which is the opposite of the condition the thermal design was probably done at.
Industries we also supply
Power Supplies & Adapters
A switching power supply converts AC mains into a regulated DC output through a high-frequency converter, and its efficiency is decided by which devices switch and rectify. OCENME supplies the device set for adapters and open-frame supplies from 5 W to 300 W: 650 V super junction MOSFETs for the primary, 30–100 V MOSFETs for synchronous rectification, and bridge rectifiers from 1 A to 8 A for the input..
View sectorTelecom & UPS Power
Telecom rectifiers and UPS systems run continuously at high ambient with a service life measured in a decade, so device selection is driven by derating margin and long-term stability rather than by peak efficiency. OCENME supplies 650 V super junction MOSFETs, SiC Schottky diodes and fast recovery diodes for rectifier PFC stages and UPS inverter legs, with HTRB and H3TRB reports per part number..
View sectorWelding Equipment
An inverter welding machine runs a high-frequency transformer at high current and high duty cycle, so its diodes must survive repeated high di/dt commutation rather than steady-state current. OCENME supplies 600–1200 V fast recovery diodes and 500–650 V MOSFETs for welding inverter stages, with IFSM, Trr and thermal cycling data stated per part number..
View sectorSolar & Energy Storage
A solar inverter or battery converter moves power in both directions at high frequency, so device choice is driven by switching loss and body-diode behaviour rather than by conduction loss alone. OCENME supplies 650 V and 800 V SiC MOSFETs, 650 V SiC Schottky diodes and 650 V super junction MOSFETs for boost stages and battery converters from 200 W to 10 kW..
View sectorSend the part number and the operating conditions
Tell us the voltage class, current, switching frequency and what the device is replacing. You will get a datasheet, a parameter comparison at matched conditions, and a quotation with MOQ and lead time.