MP3393—8-STRING WHITE LED DRIVER WITH STEP-UP CONTROLLER

MP3393 Rev. 1.05

www.MonolithicPower.com

6

3/26/2013

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© 2013 MPS. All Rights Reserved.

PIN FUNCTIONS

Pin #

Name

Description

1

VIN

Supply Input. The power to the chip, as well as the step-up converter switch. Drive VIN

with 9V-to-32V power source. Must be locally bypassed.

2

VCC

Internal 10V Linear Regulator Output. Provides power for the internal MOSFET switch

gate driver and the internal control circuitry. Bypass VCC to GND with a ceramic

capacitor.

3

COMP

Step-up Converter Compensator. Compensates the regulation control loop. Connect a

ceramic capacitor from COMP to GND.

4

OSC

Switching Frequency Set. Connect a resistor between OSC and GND to set the step-up

converter’s switching frequency. The voltage at this pin is regulated to 1.23V. The clock

frequency is proportional to the current sourced from this pin.

5

EN

Enable Control Input. Do not leave this pin floating. Use a ceramic capacitor for local

filtering.

6

DIM

Dimming. For PWM dimming, apply an external PWM signal with amplitude greater than

1.5V. For analog dimming, apply a DC voltage ranging from 0.4V to 1.5V to linearly set

the LED current from 0% to 100%.

7

FB1

LED Current Feedback. Detects the channel 1 current.

8

CTL1

External Transistor Control Pin. Connect it to the base of an external transistor to regulate

the channel 1 current.

9

FB2

LED Current Feedback. Detects the channel 2 current.

10

CTL2

External Transistor Control Pin. Connect it to the base of an external transistor to regulate

the channel 2 current.

11

FB3

LED Current Feedback. Detects the channel 3 current.

12

CTL3

External Transistor Control Pin. Connect it to the base of an external transistor to regulate

the channel 3 current.

13

FB4

LED Current Feedback. Detects the channel 4 current.

14

CTL4

External Transistor Control Pin. Connect it to the base of an external transistor to regulate

the channel 4 current.

15

CTL5

External Transistor Control Pin. Connect it to the base of an external transistor to regulate

the channel 5 current.

16

FB5

LED Current Feedback. Detects the channel 5 current.