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SGM3128 Datasheet(PDF) 7 Page - SG Micro Corp |
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SGM3128 Datasheet(HTML) 7 Page - SG Micro Corp |
7 / 10 page 3-Channel Low Dropout Low Side White LED Driver 7 SG Micro Corp www.sg-micro.com SGM3128 APPLICATION INFORMATION Enable Input Drive EN high to enable the device; drive EN low to force LED1, LED2 and LED3 into a high-impedance state. When driven high, EN draws 240μA to power the IC. Driving EN low longer than 3ms will disable the device and the typical supply current will be less than 1µA. Input UVLO The input operating voltage range of the SGM3128 is 2.5V to 5.5V. An input capacitor at the VCC pin could reduce ripple voltage. It is recommended to use a ceramic 0.1μF or larger capacitance as the input capacitor. This IC provides an under voltage lockout (UVLO) function to prevent it from unstable issue when startup. The UVLO threshold of input rising voltage is set at 2.1V typically with a hysteresis 0.11V. LED Brightness Dimming Control For controlling the LED brightness, the SGM3128 can perform the dimming control by applying a PWM signal to EN pin. When an external PWM signal is applied to the EN pin, brightness of white LED is adjusted by the duty cycle. The average LED current is proportional to the PWM signal duty cycle. The magnitude of the PWM signal must be higher than the minimum level of enable input high level, in order to let the dimming control perform correctly. The suggested PWM frequency range is 20kHz to 200Hz. |
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