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A Product Line of
Diodes Incorporated
ZXLD1322
LED Thermal Control Circuit (T ADJ ) Parameters
Symbol
VT ADJH
VT ADJL
Parameter
Upper threshold voltage
Lower threshold voltage
Condition
Onset of output current reduction
(V TADJ falling)
Output current reduced to
<10% of set value (V TADJ falling)
Min.
Typ.
75
50
Max.
Unit
mV
mV
Gm (TADJ)
Trans conductance
Δ I OUT / Δ V TADJ
4
mA/V
Output Current Regulation Parameters
Symbol
I OUT
Parameter
Minimum output/ LED current
V IN > 3V
Condition
Min.
Typ.
0.75
Max.
Unit
A
Efficiency
Δ I OUT
TCO
I (OUT)
Δ I OUT /
I OUT
Δ I OUT /
Δ V IN
Eff
Output current accuracy (g)
Output current temperature drift
Load Current Regulation
Line Voltage Regulation of output
current
(f)
3.0V < V IN < 15V, I OUT = 700mA,
V ADJ = 100mV,
3.0V < V IN < 15V, Iout = 700mA,
V ADJ = 100mV
350mA < I (LED) < 700mA
350mA < I (LED) < 700mA
-5
100
2
0.5
85
+5
200
%
ppm/K
%/A
%/V
%
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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