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MP3388 Datasheet(PDF) 6 Page - Monolithic Power Systems |
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MP3388 Datasheet(HTML) 6 Page - Monolithic Power Systems |
6 / 14 page MP3388- 50V, 8-STRING WHITE LED DRIVERS MP3388 Rev. 1.0 www.MonolithicPower.com 6 12/16/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. PIN FUNCTIONS (continued) QFN24 SOIC28 Name Description 15 21 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. If this string is not used, connect Vout to this pin. 16 22 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 MP3388 triggers OV Protection mode. 17 23 PGND2 Step-up Converter Power Ground. 18 24 PGND1 Step-up Converter Power Ground. PGND1 and PGND2 should be shorted externally. 19 28 SW2 Step-up Converter Power Switch Output. SW2 is the drain of the internal MOSFET switch. Connect the power inductor and output rectifier to SW2. SW2 can swing between GND and 50V. SW1 and SW2 should be shorted externally. 20 26 SW1 Step-up Converter Power Switch Output. SW1 is the drain of the internal MOSFET switch. Connect the power inductor and output rectifier to SW1. SW1 can swing between GND and 50V. SW1 and SW2 should be shorted externally. 21 1 VFAULT Fault Disconnection Switch Driver Output. When the system starts up normally, this pin turns on the external PMOS. When the MP3388 is disabled, the external PMOS is turned off to disconnect the input and output. 22 2 COMP Step-up Converter Compensation Pin. This pin is used to compensate the regulation control loop. Connect a capacitor or a series RC network from COMP to GND. 23 3 VIN Supply Input. VIN supplies the power to the MP3388 chip. Drive VIN with a 4.5V to 25V power source. Must be locally bypassed. 24 4 VCC The Internal 5V Linear Regulator Output. VCC provides power supply for the internal MOSFET switch gate driver and the internal control circuitry. Bypass VCC to GND with a ceramic capacitor. If VIN is less than 5.5V, apply an external 5V supply directly on VCC. 15, 17, 25, 27 NC No connect |
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