Diodes ZXLD1366 - Manual (Page 4)

ZXLD1366
Document number: DS31992 Rev. 8 - 2
4 of 30
www.diodes.com
October 2013
© Diodes Incorporated
A Product Line of
Diodes Incorporated
ZXLD1366
Electrical Characteristics
(Test conditions: (@ V
IN
= 24V, T
A
= +25°C, unless otherwise specified.)
Symbol Parameter Condition Min Typ Max Unit
V
SU
Internal regulator start-up threshold 4.85 5.20 V
V
SD
Internal regulator shutdown threshold 4.40 4.75 V
I
INQoff
Quiescent supply current with output off ADJ pin grounded 65 108 µA
I
INQon
Quiescent supply current with output switching
(Note 9)
ADJ pin floating, L = 68µH,
3 LEDs, f = 260kHz
1.6 mA
V
SENSE
Mean current sense threshold voltage
(Defines LED current setting accuracy)
Measured on I
SENSE
pin with
respect to V
IN
V
ADJ
= 1.25V;
V
IN
= 18V
195 200 205 mV
V
SENSEHYS
Sense threshold hysteresis ±15 %
I
SENSE
I
SENSE
pin input current V
SENSE
= V
IN
-0.2 4 10 µA
V
REF
Internal reference voltage
Measured on ADJ pin with pin
floating
1.25 V
ΔV
REF
/ ΔT Temperature coefficient of V
REF
50 ppm/°C
V
ADJ
External control voltage range on ADJ pin for DC
brightness control (Note 7)
0.3 2.5 V
V
ADJoff
DC voltage on ADJ pin to switch device from active
(on) state to quiescent (off) state
V
ADJ
falling 0.15 0.20 0.27 V
V
ADJon
DC voltage on ADJ pin to switch device from
quiescent (off) state to active (on) state
V
ADJ
rising 0.20 0.25 0.30 V
R
ADJ
Resistance between ADJ pin and V
REF
0 < V
ADJ
< V
REF
V
ADJ
> V
REF
+100mV
30
10.4
50
14.2
65
18.0
kΩ
I
LXmean
Continuous LX switch current 1 A
R
LX
LX switch ‘On’ resistance @ I
LX
= 1A 0.50 0.75 Ω
I
LX(leak)
LX switch leakage current 5 µA
D
PWM(LF)
Duty cycle range of PWM signal applied to ADJ pin
during low frequency PWM dimming mode
PWM frequency < 300Hz PWM
amplitude = V
REF
Measured on ADJ pin
0.001 1.000 V
Brightness control range 1000:1
DC
ADJ
DC Brightness control range (Note 8) 5:1
t
SS
Soft start time
Time taken for output current to
reach 90% of final value after
voltage on ADJ pin has risen
above 0.3V. Requires external
capacitor 22nF. See graphs for
more details
2 ms
f
LX
Operating frequency
(See graphs for more details)
ADJ pin floating
L = 68µH (0.2V)
I
OUT
= 1A @ V
LED
= 3.6V
Driving 3 LEDs
260 kHz
t
ONmin
Minimum switch ‘ON’ time LX switch ‘ON’ 130
t
OFFmin
Minimum switch ‘OFF’ time LX switch ‘OFF’ 70
Notes: 9. Static current of device is approximately 700 µA, see Graph, Page 16
10. 100% brightness corresponds to V
ADJ
= V
ADJ(nom)
= V
REF
. Driving the ADJ pin above V
REF
will increase the V
SENSE
threshold and output current
proportionally.
11. Ratio of maximum brightness to minimum brightness before shutdown V
REF
= 1.25/0.3. V
REF
externally driven to 2.5V, ratio 10:1 .