ZXLD1350Q_17 datasheet(10/21 Pages) DIODES

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ZXLD1350Q

Document number: DS37076 Rev. 2 - 2

10 of 21

www.diodes.com

September 2017

ZXLD1350Q

Application 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  0.27

Ω]

The table below gives values of nominal average output current for several preferred values of current setting resistor (RS) in the typical

application circuit shown on page 1:

(Ω)

Nominal Average Output Current (mA)

0.27

370

0.30

333

0.33

300

0.39

256

The above values assume that the ADJ pin is floating and at a nominal voltage of VREF (=1.25V). Note that RS = 0.27 is the minimum allowed

value of sense resistor under these conditions to maintain switch current below the specified maximum value.

It is possible to use different values of RS if the ADJ pin is driven from an external voltage. (See next section).

Output Current Adjustment by External DC Control Voltage

The ADJ pin can be driven by an external dc voltage (VADJ), as shown, to adjust the output current to a value above or below the nominal average

value defined by RS.

The nominal average output current in this case is given by:

IOUTdc = 0.08*VADJ /RS

for 0.3 < VADJ < 2.5V

Note that 100% brightness setting corresponds to VADJ = VREF. When driving the ADJ pin above 1.25V, RS must be increased in proportion to

prevent IOUTdc exceeding 370mA maximum.

The input impedance of the ADJ pin is 20

0kΩ ±25%.

GND

ZXLD1350

ADJ

GND

ZXLD1350Q

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