Discontinued Products are limited to existing inventory.
The SM8121A is a high efficiency step-up DC/DC converter. Due to high voltage CMOS process realizing 25V output supply as maximum value, 2 to 6 lights of white LED connected in series can be lighted. By connecting in series, current variation among LED is eliminated. Current value sent to white LED can be set by external resistors. In addition, brightness can also be adjusted by control to FB pin or CE pin.
Key Features
Boost-up control using PWM
2 to 6 lights of white LED (connected in series) lighted
Output current value can be set by external resistors
(51Ω: 9.8mA, 33Ω: 15.2mA, 24Ω: 20.8mA)
Brightness adjustable by control to FB pin or CE pin
Current variation among LED decreased by high precision
SM8121A.pdf