LED6000 datasheet(6/49 Pages) STMICROELECTRONICS

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Pin settings

LED6000

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DocID027777 Rev 2

2.2

Pin description

Table 1. Pin description

No.

Description

VBIAS

Auxiliary input that can be used to supply a part of the analog circuitry to increase the

efficiency at the light-load. Connect to GND if not used or bypass with a 1 µF ceramic

capacitor if supplied by an auxiliary rail.

VIN

DC input voltage

VIN

DC input voltage

4VCC

Filtered DC input voltage to the internal circuitry. Bypass to the signal GND by a 1 µF

ceramic capacitor.

Active high enable pin. Connect to the VCC pin if not used.

6SS

An internal current generator (5 µA typ.) charges the external capacitor to implement

the soft-start.

SYNCH Master / slave synchronization

8COMP

Output of the error amplifier. The designed compensation network is connected at

this pin.

Inverting input of the error amplifier

FSW

A pull-down resistor to GND selects the switching frequency.

ILIM

A pull-down resistor to GND selects the peak current limitation.

DIM

A PWM signal in this input pin implements the LED PWM current dimming. It's pulled-

down by an internal 2 µA current.

Switching node

BOOT

Connect an external capacitor (100 nF typ.) between BOOT and LX pins. The gate

charge required to drive the internal n-DMOS is recovered by an internal regulator

during the off-time.

GND

Signal GND

E. P.

The exposed pad must be connected to the signal GND.

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