1

3

4

5

6

2

7

Exposed Pad

Connect to GND

LED+

LED+

DIM

GND

VREF

IADJ

LED-

EP

High Power LED String

TPS92550

TPS92550, TPS92550EVM

www.ti.com

SNVS806B – MAY 2012 – REVISED OCTOBER 2012

TYPICAL APPLICATION CIRCUIT

CONNECTION DIAGRAM

Figure 5. 7-Pin PFM (Top View)

See NDW0007A Package

PIN DESCRIPTIONS

Pin

Name

Description

Function

Number

1,2

LED+

Anode of LED string

Supply input and rail connection to the anode of the LED string.

3

DIM

Dimming signal input

Dimming control signal input. Open to enable or apply logic level PWM signal

to control the brightness of the LED string.

4

GND

Ground

Reference point for all stated voltages. Connect to the exposed pad of the

package externally.

5

VREF

Voltage reference

Internal voltage reference output.

6

IADJ

LED current adjustment

Fine tunning of the LED current by connecting a resistor between this pin and

ground. Connect this pin to ground for factory preset current.

7

LED-

Cathode of LED string

The current return pin of the LED string, connect to the cathode of the LED

string.

EP

Exposed Pad

Exposed thermal pad

Used to dissipate heat from the package during operation. Must connect to

GND directly.

Copyright © 2012, Texas Instruments Incorporated

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