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ZXLD1362 Datenblatt(PDF) 3 Page - Zetex Semiconductors

Teilenummer ZXLD1362
Bauteilbeschribung  1A LED driver with internal switch
PDF  32 Pages
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Hersteller  ZETEX [Zetex Semiconductors]
Direct Link  http://www.diodes.com/
Logo ZETEX - Zetex Semiconductors

ZXLD1362 Datenblatt(HTML) 3 Page - Zetex Semiconductors

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ZXLD1362
Provisional version B - July 2007
3
www.zetex.com
© Zetex Semiconductors plc 2007
Electrical characteristics (test conditions: VIN=24V, Tamb=25°C unless otherwise stated) (cont.)
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Unit
VADJon
DC voltage on ADJ pin to switch
device from quiescent (off) state
to active (on) state
VADJ rising
0.2
0.25
0.3
V
RADJ
Resistance between ADJ pin and
VREF
0< VADJ < VREF
VADJ > VREF +100mV
30
13.5
50
20
65
25
k
ILXmean
Continuous LX switch current
1
A
RLX
LX Switch ‘On’ resistance
@ ILX = 1 A
0.5
1.0
ILX(leak)
LX switch leakage current
5
A
DPWM(LF) Duty cycle range of PWM signal
applied to ADJ pin during low
frequency PWM dimming mode
PWM frequency
<300Hz
PWM amplitude = VREF
Measured on ADJ pin
0.001
1
Brightness control range
1000:1
DCADJ (*)
NOTES:
(*) Ratio of maximum brightness to minimum brightness before shutdown VREF = 1.25/0.3. VREF externally driven to 2.5V,
ratio 10:1.
DC Brightness control range
See note (*)
5:1
TSS
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
2ms
fLX
Operating frequency
(See graphs for more detail)
ADJ pin floating
L = 68 H (0.1 )
IOUT = 1A @ VLED = 3.6V
Driving 3 LEDs
260
KHz
TONmin
Minimum switch ‘ON’ time
LX switch ‘ON’
240 (†)
(†) Parameters are not tested at production. Parameters are guaranteed by design, characterization and process control.
TBD
ns
TOFFmin
Minimum switch ‘OFF’ time
LX switch ‘OFF’
200 (†) TBD
ns
TONmin_REC Recommended minimum switch
'ON' time
LX switch 'ON'
800
ns
fLXmax
Recommended maximum
operating frequency
1MHz
DLX
Recommended duty cycle range
of output switch at fLXmax
0.3
0.7
TPD
Internal comparator propagation
delay
50
ns



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