ZXLD1322 Ver la hoja de datos (PDF) - Diodes Incorporated.

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Fabricante

ZXLD1322

BUCK/BOOST MODE DC-DC CONVERTER FOR LED DRIVING WITH 700mA OUTPUT AND CURRENT CONTROL

Diodes Incorporated. 

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ZXLD1322

LED Thermal Control Circuit (TADJ) Parameters

Symbol

Parameter

Condition

VTADJH

Upper threshold voltage

VTADJL

Gm(TADJ)

Lower threshold voltage

Trans conductance

ΔIOUT/ΔVTADJ

Onset of output current reduction

(VTADJ falling)

Output current reduced to

<10% of set value (VTADJ falling)

Min.

Typ.

75

Max.

50

4

Unit

mV

mV

mA/V

Output Current Regulation Parameters

Symbol

Parameter

Condition

Min. Typ. Max.

Unit

IOUT

Minimum output/ LED current

VIN > 3V

0.75

A

ΔIOUT

Output current accuracy(g)

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

-5

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

2

%/A

ΔIOUT/

ΔVIN

Eff

Line Voltage Regulation of output

current

Efficiency(f)

350mA < I(LED) < 700mA

0.5

%/V

85

%

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.

ZXLD1322

Document number: DS32166 Rev. 3 - 2

7 of 17

www.diodes.com

April 2010

© Diodes Incorporated

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