T8308 datasheet(6/10 Pages) TMT

6 / 10 page

T8308

TM Technology, Inc. reserves the right

P. 6

Publication Date: Oct. 2014

to change products or specifications without notice.

Revision:C

Applications Information

Setting nominal average output current with external resistor RS

The nominal average output current in the LED(s) is determined by the value of the external current

sense resistor (RS) connected between VIN and ISENSE and is given by:

IOUTnom = 0.1/RS [for RS ≥ 0.066 ohm]

The table below gives values of nominal average output current for several preferred values of

current setting resistor (RS) in the typical application circuit :

RS (ohm)

0.125

0.2

0.285

Nominal average

output current (mA)

800

500

350

The above values assume that the EN pin is floating.

Note: that RS = 0.125 ohm is the minimum allowed value of sense resistor under these conditions to

maintain switch current below the specified maximum value.

Shutdown mode

Taking the EN pin to a voltage below 0.5V for more than approximately 100us, will turn off the

output and supply current will fall to a low standby level of 35uA nominal.

T8308 Datasheet(PDF) 6 Page - Taiwan Memory Technology