ZXLD1356(2008) Просмотр технического описания (PDF) - Diodes Incorporated.
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ZXLD1356 Datasheet PDF : 32 Pages
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ZXLD1356
Electrical characteristics (test conditions: VIN=24V, Tamb=25°C unless otherwise stated) (cont.)
Symbol Parameter
Conditions
Min. Typ. Max.
VADJon
DC voltage on ADJ pin to switch VADJ rising
device from quiescent (off) state
to active (on) state
0.2 0.25 0.3
RADJ
Resistance between ADJ pin
and VREF
0< VADJ < VREF
VADJ > VREF +100mV
30 50 65
10.4 14.2 18
ILXmean Continuous LX switch current
0.55
RLX
LX Switch ‘On’ resistance
@ ILX = 0.55A
0.5 0.75
ILX(leak) LX switch leakage current
5
DPWM(LF) Duty cycle range of PWM signal PWM frequency <300Hz 0.001
1
applied to ADJ pin during low PWM amplitude = VREF
frequency PWM dimming mode Measured on ADJ pin
Brightness control range
1000:1
DCADJ (*) DC Brightness control range
See note (*)
5:1
TSS
Start up time
Time taken for output
2
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
fLX
Operating frequency
ADJ pin floating
(See graphs for more detail)
L = 68H (0.36⍀)
IOUT = 0.55A @ VLED =
3.6V
360
Driving 3 LEDs
TONmin Minimum switch ‘ON’ time
LX switch ‘ON’
130 (†)
TOFFmin Minimum switch ‘OFF’ time
LX switch ‘OFF’
70 (†)
TPWmin_REC Recommended minimum switch LX switch 'ON' or ‘OFF’
800
pulse width
fLXmax Recommended maximum
500
operating frequency
DLX
Recommended duty cycle range
of output switch at fLXmax
0.3
0.7
Unit
V
k⍀
k⍀
A
⍀
A
ms
kHz
ns
ns
ns
kHz
NOTES:
(*) Ratio of maximum brightness to minimum brightness before shutdown VREF = 1.25/0.3. VREF externally driven to 2.5V,
ratio 10:1.
(†) Parameters are not tested at production. Parameters are guaranteed by design, characterization and process control.
Issue 2 - September 2008
3
© Diodes Incorporated 2008
www.zetex.com
www.diodes.com
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