Linear low-voltage-drop LED driver IC
Infineon’s BCR431U is a linear LED driver IC in a small SOT23-6 package regulating the LED current in standalone operation without any external power transistor. It is suitable for driving currents up to 37mA and the IC supply voltage ranges from 6V up to 42V. The LED current level can be adjusted by connecting a high-ohmic resistor Rset to pin RS. The voltage drop at the integrated LED driver stage is 200mV max. at 37mA improving the overall system efficiency and providing extra voltage headroom to compensate for tolerances of LED forward voltage and supply voltage. Despite temperature changes, the driving current is always under control. Thanks to a smart temperature controlling circuit which is reducing the LED current when the junction temperature of BCR431U is very high.
Summary of Features
Supply voltage from 6 to 42V
Controls up to 37mA LED current
Typ. 105mV saturation voltage at 15mA
Smart temperature control
LED current precision ±10% over the whole current range
High ESD robustness
LED current can be adjusted by Rset functionality
Benefits
Flexible for 12V / 24V / 36V designs
Low voltage-drop enables voltage headroom
for more LEDs and better efficiency
for longer LED strips and less feeding points
for more flexibility in power supplies used
High precision for low-power LEDs
Thermal protection in critical temperature ranges
Protection against surge events
Potential Applications
LED strip
Architectural LED lighting
LED displays and channel letters
Emergency lighting
Retail lighting
White good lighting
Linear low-voltage-drop LED driver IC
Infineon’s BCR431U is a linear LED driver IC in a small SOT23-6 package regulating the LED current in standalone operation without any external power transistor. It is suitable for driving currents up to 37mA and the IC supply voltage ranges from 6V up to 42V. The LED current level can be adjusted by connecting a high-ohmic resistor Rset to pin RS. The voltage drop at the integrated LED driver stage is 200mV max. at 37mA improving the overall system efficiency and providing extra voltage headroom to compensate for tolerances of LED forward voltage and supply voltage. Despite temperature changes, the driving current is always under control. Thanks to a smart temperature controlling circuit which is reducing the LED current when the junction temperature of BCR431U is very high.
Summary of Features
- Supply voltage from 6 to 42V
- Controls up to 37mA LED current
- Typ. 105mV saturation voltage at 15mA
- Smart temperature control
- LED current precision ±10% over the whole current range
- High ESD robustness
- LED current can be adjusted by Rset functionality
Benefits
- Flexible for 12V / 24V / 36V designs
- Low voltage-drop enables voltage headroom
- for more LEDs and better efficiency
- for longer LED strips and less feeding points
- for more flexibility in power supplies used
- High precision for low-power LEDs
- Thermal protection in critical temperature ranges
- Protection against surge events
Potential Applications
- LED strip
- Architectural LED lighting
- LED displays and channel letters
- Emergency lighting
- Retail lighting
- White good lighting
