Diodes ZXLD1360 - Manual (Page 4)

ZXLD1360
ZXLD1360
Document number: DS33471 Rev. 4 - 2
4 of 25
www.diodes.com
March 2011
© Diodes Incorporated
A Product Line of
Diodes Incorporated
Electrical Characteristics
(Test conditions: V
IN
= 12V, TA = 25°C, unless otherwise specified. Note 3)
Symbol Parameter Condition Min. Typ. Max. Unit
V
SU
Internal regulator start-up threshold V
IN
rising 5.65 V
V
SD
Internal regulator shutdown threshold V
IN
falling 5.55 V
I
INQoff
Quiescent supply current with output off ADJ pin grounded 20 40 µA
I
INQon
Quiescent supply current with output switching
ADJ pin floating
f=250kHz
1.8 5.0 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
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
1.25 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 2)
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
0 < V
ADJ
< V
REF
V
ADJ
> V
REF
+100mV
135
13.5
250
25
k Ω
I
LXmean
Continuous LX switch current 1 A
R
LX
LX switch ‘On’ resistance @ I
LX
=0.55A 0.5 1.0 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 <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
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
500 µs
f
LX
Operating frequency
(See graphs for more details)
ADJ pin floating
L = 33µH (0.093V)
I
OUT
= 1A @ V
LED
= 3.6V
Driving 1 LED
280 kHz
t
OFFMIN
Minimum switch off-time 200 ns
t
ONMIN
Minimum switch on-time 240 ns
t
PD
Internal comparator propagation delay 50 ns
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 +125°C
temperature range, are guaranteed by design, characterization and process control.