Linear LED Driver with BCR430U Engineering Report
Engineering report for a 24V, 100mA linear LED driver using the BCR430U. Features low voltage drop (135mV), over-temperature protection, and adjustable current.
Overview
This engineering report describes an evaluation board design for a low-voltage-drop linear LED driver based on the Infineon BCR430U controller IC. The solution operates from a supply voltage of 6V to 42V and regulates LED current up to 100mA in standalone operation without external power transistors. The design achieves a typical saturation voltage of 135mV at 50mA, providing extra headroom for LED forward voltage tolerances. The document includes a full schematic, PCB layout guidelines, and a bill of materials featuring Lumileds MXA9-PW65-H001 LEDs. Performance is verified through thermal testing and current stability measurements across a -40°C to 125°C temperature range.
Use Cases
- LED strips
- LED displays and channel letters
- Architectural and landscape lighting
- Retail lighting
- Low-cost linear LED driver design
Topics
Referenced Parts
Infineon
BCR430U is a linear LED controller IC in a small PG-SOT23-6-1 package regulating the LED current
Lumileds
D1, D2, D3, D4, D5, D6, D7, D8 | White LEDs with VF approx. 2.8 V at 50 mA | Lumileds MXA9-PW65-H001
Infineon
Infineon BCR430U controller IC. It is an engineering report on features and performance for a 24 V/100 mA (max.
Infineon
In this application, an Infineon BCR430U is used as an LED driver IC. It regulates the LED current in standalone
Wurth Electronics
J_onboard, J_outside | Through-hole header, 2.54 mm pitch, two pins, right angle | Würth Elektronik 61300211021
SP001659266
Infineon
U1 BCR430U, SOT23-6 Infineon SP001659266
SOT23-6
Infineon
U1 BCR430U, SOT23-6 Infineon SP001659266
| 969102-0000-DA | 3M | J_jump | Jumper sockets, placed on top of J_onboard | 3M 969102-0000-DA |
| BCR430U | Infineon | BCR430U is a linear LED controller IC in a small PG-SOT23-6-1 package regulating the LED current |
| MXA9-PW65-H001 | Lumileds | D1, D2, D3, D4, D5, D6, D7, D8 | White LEDs with VF approx. 2.8 V at 50 mA | Lumileds MXA9-PW65-H001 |
| BCR430U | Infineon | Infineon BCR430U controller IC. It is an engineering report on features and performance for a 24 V/100 mA (max. |
| BCR430U | Infineon | In this application, an Infineon BCR430U is used as an LED driver IC. It regulates the LED current in standalone |
| 61300211021 | Wurth Electronics | J_onboard, J_outside | Through-hole header, 2.54 mm pitch, two pins, right angle | Würth Elektronik 61300211021 |
| SP001659266 | Infineon | U1 BCR430U, SOT23-6 Infineon SP001659266 |
| SOT23-6 | Infineon | U1 BCR430U, SOT23-6 Infineon SP001659266 |