The R1203x Series are CMOS-based PWM step-up DC/DC converters, which are optimized to drive white LEDs with constant current
The R1203x Series are CMOS-based PWM step-up DC/DC converters designed specifically for driving white LEDs. They feature an under-voltage lockout circuit (UVLO) and an over-voltage protection circuit (OVP). The series allows for the determination of LED current via a setting resistor and enables brightness adjustment through a PWM signal applied to the CE pin, with frequencies ranging from 200Hz to 300kHz.
| Supply Current (Ipp) | Typ. 500uA |
|---|---|
| Oscillator Frequency (fosc) | 1.2MHz |
| Standby Current (Istandby) | Max. 5uA |
| Oscillator Maximum Duty Cycle | Typ. 91% |
| Input Voltage Range (Vin) | -1.8V to 5.5V |
| UVLO Detect Voltage (Vuvo) | Typ. 1.6V |
| Feedback Voltage (Vrs) | See Table |
| Over Voltage Protection Circuit (OVP) | 29.5V |
| Coil-current Limit Circuit Current limit | Typ. 700mA |
The input voltage range is -1.8V to 5.5V.
Brightness is adjusted quickly by applying a PWM signal between 200Hz and 300kHz to the CE pin.