ZXLD1352 Просмотр технического описания (PDF) - Diodes Incorporated.
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ZXLD1352 Datasheet PDF : 21 Pages
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A Product Line of
Diodes Incorporated
ZXLD1352
Electrical Characteristics (Test conditions: VIN = 12V, Tamb = 25°C, unless otherwise specified.)
Symbol
Parameter
Conditions
Min. Typ. Max. Unit
VSU
Internal regulator start-up threshold VIN rising
4.8
V
IINQoff
Quiescent supply current
with output off
ADJ pin grounded
20
30
µA
IINQon
Quiescent supply current
with output switching
ADJ pin floating
f = 250kHz
250 500 µA
VSENSE
Mean current sense threshold voltage Measured on ISENSE pin with respect
(defines LED current setting accuracy) to VIN VADJ =1.25V
95
100 105 mV
VSENSEHYS Sense threshold hysteresis
±15
%
ISENSE
ISENSE pin input current
VSENSE = VIN -0.1
1.25
10
µA
VREF
Internal reference voltage
Measured on ADJ pin with pin floating 1.21 1.25 1.29 V
ΔVREF /ΔT Temperature coefficient of VREF
50
ppm/°C
VADJ
External control voltage range on ADJ
pin for dc brightness control1
0.3
2.5
V
VADJoff
DC voltage on ADJ pin to switch device
from active (on) state to quiescent (off) VADJ falling
state
0.15 0.2 0.25 V
VADJon
DC voltage on ADJ pin to switch device
from quiescent (off) state to active (on) VADJ rising
state
0.2 0.25 0.3
V
RADJ
Resistance between ADJ pin and VREF
35
65
kΩ
ILXmean
Continuous LX switch current
0.37 A
RLX
LX Switch ‘On’ resistance
1.5
2
Ω
ILX(leak)
DPWM(LF)
LX switch leakage current
Duty cycle range of PWM signal
applied to ADJ pin during PWM
dimming mode
PWM frequency 100Hz – 1kHz
PWM amplitude = VREF
Measured on ADJ pin
0.001
1
µA
1
Brightness control range
1000:1
fLX
Operating frequency
(See graphs for more detail)
ADJ pin floating
L=100µH (0.82V)
IOUT=350mA @ VLED=3.4V
Driving 1 LED
250
kHz
tPD
Notes:
Internal comparator propagation delay
50
ns
1. 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.
2. 100% brightness corresponds to VADJ = VADJ(nom) = VREF. Driving the ADJ pin above VREF will increase the VSENSE threshold and output current
proportionally.
ZXLD1352
Document number: DS33469 Rev. 3 - 2
4 of 21
www.diodes.com
December 2010
© Diodes Incorporated
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