ZXLD1322 datasheet(7/17 Pages) DIODES

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ZXLD1322

Document number: DS32166 Rev. 3 - 2

7 of 17

www.diodes.com

April 2010

A Product Line of

Diodes Incorporated

LED Thermal Control Circuit (TADJ) Parameters

Symbol

Parameter

Condition

Min.

Typ.

Max.

Unit

VTADJH

Upper threshold voltage

Onset of output current reduction

(VTADJ falling)

VTADJL

Lower threshold voltage

Output current reduced to

<10% of set value (VTADJ falling)

Gm(TADJ)

Trans conductance

ΔIOUT/ΔVTADJ

mA/V

Output Current Regulation Parameters

Symbol

Parameter

Condition

Min.

Typ.

Max.

Unit

IOUT

Minimum output/ LED current

VIN > 3V

0.75

ΔIOUT

Output current accuracy

(g)

3.0V < VIN < 15V, IOUT = 700mA,

VADJ = 100mV,

-5

TCO

I(OUT)

Output current temperature drift

3.0V < VIN < 15V, Iout = 700mA,

VADJ = 100mV

100

200

ppm/K

ΔIOUT/

IOUT

Load Current Regulation

350mA < I(LED) < 700mA

%/A

ΔIOUT/

ΔVIN

Line Voltage Regulation of output

current

0.5

%/V

Eff

Efficiency

(f)

350mA < I(LED) < 700mA

Notes:

(f) System parameter only. This value is dependent upon external components and circuit configuration.

(g) This refers to the accuracy of output current regulation under normal operation when the feedback loop incorporating the current monitor is active.

The tolerances of external components are not included in this figure.

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