MP3388S datasheet(5/15 Pages) MPS

5 / 15 page

MP3388S—50V, 8-STRING, STEP-UP, WHITE LED DRIVER

MP3388S Rev.1.01

www.MonolithicPower.com

10/29/2012

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

PIN FUNCTIONS

Pin #

Name

Description

Enable Control Input. Do not let this pin floating.

OSC

Switching-Frequency Selection. When left floating or connected to VCC, the step-up

converter switching frequency is 1.25MHz. When connected to GND, the step-up converter

switching frequency is 625kHz.

FPWM

Dimming PWM Frequency Setting. Connect a capacitor, CFPWM, between FPWM and GND to

set the DPWM frequency using the equation: fDPWM=3.5μF/CFPWM.

PWMO

PWM Filter Output. For external PWM dimming, connect a capacitor between PWMO and

GND. For DC-input PWM dimming, directly apply a DC voltage between 0.2V and 1.2V. The

DC-input PWM dimming polarity is negative.

GND

Analog Ground.

PWMI

PWM Signal Input. For external PWM dimming mode, apply a PWM signal. For DC-input

PWM dimming mode, leave floating.

LED8

LED String 8 Current Input. This pin is the open-drain output of an internal dimming-control

switch. Connect the LED String 8 cathode to this pin.

LED7

LED String 7 Current Input. This pin is the open-drain output of an internal dimming-control

switch. Connect the LED String 7 cathode to this pin.

LED6

LED String 6 Current Input. This pin is the open-drain output of an internal dimming-control

switch. Connect the LED String 6 cathode to this pin.

LED5

LED String 5 Current Input. This pin is the open-drain output of an internal dimming-control

switch. Connect the LED String 8 cathode to this pin.

ISET

LED Current Setting. Tie a current setting resistor from this pin to ground to program the

current in each LED string. ILED = 1000 x 1.21V / RSET

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.

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.

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.

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.

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