Diodes ZXLD1322 - Manual (Page 7)

ZXLD1322
ZXLD1322
Document number: DS32166 Rev. 3 - 2
7 of 17
www.diodes.com
April 2010
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A Product Line of
Diodes Incorporated
LED Thermal Control Circuit (T
ADJ
) Parameters
Symbol Parameter Condition Min. Typ. Max. Unit
VT
ADJH
Upper threshold voltage
Onset of output current reduction
(V
TADJ
falling)
75 mV
VT
ADJL
Lower threshold voltage
Output current reduced to
<10% of set value (V
TADJ
falling)
50 mV
Gm
(TADJ)
Trans conductance
ΔI
OUT
/ ΔV
TADJ
4 mA/V
Output Current Regulation Parameters
Symbol Parameter Condition Min. Typ. Max. Unit
I
OUT
Minimum output/ LED current V
IN
> 3V 0.75 A
ΔI
OUT
Output current accuracy
(g)
3.0V < V
IN
< 15V, I
OUT
= 700mA,
V
ADJ
= 100mV,
-5 +5 %
TCO
I
(OUT)
Output current temperature drift
3.0V < V
IN
< 15V, Iout = 700mA,
V
ADJ
= 100mV
100 200 ppm/K
ΔI
OUT
/
I
OUT
Load Current Regulation 350mA < I
(LED)
< 700mA 2 %/A
ΔI
OUT
/
ΔV
IN
Line Voltage Regulation of output
current
0.5 %/V
Eff Efficiency
(f)
350mA < I
(LED)
< 700mA 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.