ZLED7010

40V LED Driver with Temperature Compensation

Data Sheet

August 12, 2010

© 2010 Zentrum Mikroelektronik Dresden AG — Rev. 1.1

All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the

prior written consent of the copyright owner. The information furnished in this publication is PRELIMINARY and subject to changes

without notice.

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



















2

R

4

R

3

R

R

V

V

079

.

0

I

S

ADJI

DC

_

OUT

(8)



















2

R

4

R

3

R

R

V

095

.

0

I

S

DC

_

OUT

(9)

R3 and R4 determine the slope of temperature compensation. If R4 is just 0Ω, the slope is solely driven by the

NTC component’s characteristic β-constant. Larger values of R4 will decrease the slope.

values will increase power consumption therefore values from 1k to 100k are recommended. For a selected

temperature compensation threshold, larger R3 and R4 require larger R2 to match and vice versa.

Also see section 5 regarding driver chains and temperature compensation.

Figure 4.2 shows some examples of current-temperature curves resulting from different dimensioning of the

three resistors.