Diodes ZXLD1350 - Manual (Page 4)

ZXLD1350
30V 350mA LED DRIVER with AEC-Q100
ZXLD1350
Document number: DS33468 Rev. 8 - 2
4 of 22
www.diodes.com
March 2011
© Diodes Incorporated
A Product Line of
Diodes Incorporated
Electrical Characteristics
(Test conditions: V
IN
= 12V, T amb = 25°C, unless otherwise specified.) (Note 3)
Symbol Parameter Condition Min. Typ. Max. Unit
V
SU
Internal regulator start-up threshold V
IN
rising 4.8 V
I
INQoff
Quiescent supply current with output off ADJ pin grounded 15 20 µA
I
INQon
Quiescent supply current with output switching
ADJ pin floating
f = 250kHz
250 500 µA
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
95 100 105 mV
V
SENSEHYS
Sense threshold hysteresis ±15 %
I
SENSE
I
SENSE
pin input current V
SENSE
= V
IN
-0.1 1.25 10 µA
V
REF
Internal reference voltage
Measured on ADJ pin with
pin floating
1.21 1.25 1.29 V
DV
REF
/DT Temperature coefficient of V
REF
50
ppm/°
C
V
ADJ
External control voltage range on ADJ pin for
DC brightness control (Note 4)
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 0.2 0.25 V
V
ADJon
DC voltage on ADJ pin to switch device from
quiescent (off) state to active (on) state
V
ADJ
rising 0.2 0.25 0.3 V
R
ADJ
Resistance between ADJ pin and V
REF
135 250 k Ω
I
LXmean
Continuous LX switch current 0.37 A
R
LX
LX switch ‘On’ resistance 1.5 2 Ω
I
LX(leak)
LX switch leakage current 1 µA
D
PWM(LF)
Duty cycle range of PWM signal applied to ADJ
pin during low frequency PWM dimming mode PWM frequency <500Hz
PWM amplitude = V
REF
Measured on ADJ pin
0.01 1
Brightness control range 100:1
D
PWM(HF)
Duty cycle range of PWM signal applied to ADJ
pin during high frequency PWM dimming mode PWM frequency <10kHz
PWM amplitude = V
REF
Measured on ADJ pin
0.16 1
Brightness control range 5:1
f
LX
Operating frequency
(See graphs for more details)
ADJ pin floating
L = 100H (0.82V)
I
OUT
= 350ma @ V
LED
= 3.4V
Driving 1 LED
250 kHz
t
SS
Start up time
(See graphs for more details)
Time taken for output
current to reach 90% of final
value after voltage on ADJ
pin has risen above 0.3V.
500 µs
Notes: 3. Production testing of the device is performed at 25°C. Functional operation of the device and parameters specified over a -40°C to +105°C
temperature range, are guaranteed by design, characterization and process control.
4. 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.