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MP3394 Datasheet(PDF) 5 Page - Monolithic Power Systems |
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MP3394 Datasheet(HTML) 5 Page - Monolithic Power Systems |
5 / 17 page MP3394—4-STRING, MAX 200mA/STRING WHITE LED DRIVER MP3394 Rev. 1.07 www.MonolithicPower.com 5 3/21/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. PIN FUNCTIONS TSSOP16EP &SOIC16 SOIC20 Name Description 1 1 COMP Step-up Converter Compensation Pin. This pin is used to compensate the regulation control loop. Connect a ceramic capacitor from COMP to GND. 2 2 EN Enable Control Input. Do not let this pin float. 3 3 DBRT Brightness Control Input. To use external PWM dimming mode, apply a PWM signal on this pin for brightness control. To use DC input PWM dimming mode, apply a DC voltage range from 0.2V to 1.2V on this pin linearly to set the internal dimming duty cycle from 0% to 100%. The MP3394 has positive dimming polarity on DBRT. 4 5 GND Ground. 5 7 OSC Switching Frequency Set. Connect a resistor between OSC and GND to set the step-up converter switching frequency. The voltage at this pin is regulated to 1.23V. The clock frequency is proportional to the current sourced from this pin. 6 8 ISET LED Current Set. Tie a current setting resistor from this pin to ground to program the current in each LED string. This pin voltage is regulated to 1.23V. The LED current is proportional to the current through the ISET resistor. 7 9 BOSC Dimming Repetition Set. This is the timing pin for the oscillator to set the dimming frequency. To use DC input PWM dimming mode, connect a capacitor from this pin to GND to set the internal dimming frequency. A saw- tooth waveform is generated on this pin. To use external PWM dimming mode, connect a resistor from this pin to GND, and apply the PWM signal on DBRT pin. 8 10 LED4 LED String 4 Current Input. This pin is the open-drain output of an internal dimming control switch. Connect the LED String 4 cathode to this pin. 9 11 LED3 LED String 3 Current Input. This pin is the open-drain output of an internal dimming control switch. Connect the LED String 3 cathode to this pin. 10 12 LED2 LED String 2 Current Input. This pin is the open-drain output of an internal dimming control switch. Connect the LED String 2 cathode to this pin. 11 13 LED1 LED String 1 Current Input. This pin is the open-drain output of an internal dimming control switch. Connect the LED String 1 cathode to this pin. 12 14 OVP Over-voltage Protection Input. Connect a resistor divider from output to this pin to program the OVP threshold. When this pin voltage reaches 1.23V, the MP3394 triggers Over Voltage Protection mode. |
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