Constant LED Brightness and LDS8711
The LDS8711 is a fixed frequency current mode boost converter with internal rectifier and cycle-by- cycle switch current limit specifically designed to drive a string of up to 10 White LEDs.A Switching Converter Chip with hardly any external components driving a HB LED chain. HB - High Brightness LED. This IC is from IXYS Power Devices.
High efficiency boost converter with the input voltage range from 2.7 to 5.5 V . Drives one LED string with 10 LEDs in series up to 32 mA.
- 250 mV current sense voltage
- No external Schottky Required
- 0.7 MHz Switching Frequency
- Efficiency greater than 83%
- PWM LED Brightness Control
- Low Shutdown Current (<1µA)
LED Current Setting - The maximum current value in the LED string may be factory preset in the range from 10 to 30mAin 0.125mA steps, or set by Smart OneWire interface in the range from 0.125to 32 mA.The average LED string current that determines LED brightness may be controlled applying PWM signal to the EN/PWM pin.