ZLED7010 Datasheet

© 2016 Integrated Device Technology, Inc.

16

April 20, 2016













+

∗

∗

=

2

R

4

R

3

R

R

V

V

079

.

0

I

S

ADJI

DC

_

OUT













+

∗

=

2

R

4

R

3

R

R

V

095

.

0

I

S

DC

_

OUT

The IOUT current with temperature compensation can be calculated with the following equations:

For 0.3V

≤ V

ADJI

≤ 1.2V:

(8)

For VADJI > 1.2V:

(9)

R3 and R4 determine the slope of temperature compensation. If R4 is just 0

Ω, the slope is solely driven by the

NTC component’s characteristic

β-constant. Larger values of R4 will decrease the slope.

When dimensioning R2, consider that larger values will make the RTH pin more noise sensitive and lower 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.