zxld1352 Zetex Semiconductors plc., zxld1352 Datasheet - Page 3

• Manufacturer Part Number: zxld1352
• Description: 350ma Led Driver With Internal Switch And Enhanced Pwm Dimming Range
• Manufacturer: Zetex Semiconductors plc.

Electrical characteristics
(*) Production testing of the device is performed at 25°C. Functional operation of the device and parameters specified over
(†) 100% brightness corresponds to V
Pin description
Ordering information
Issue 1 - August 2008
© Diodes Incorporated 2008
NOTES:
D
f
T
T
f
D
T
LX
GND
ADJ
I
V
Device
ZXLD1352ET5TA
SENSE
Symbol
LX
LXmax
Name
ONmin
OFFmin
PD
IN
PWM(LF)
LX
a -40°C to +105°C temperature range, are guaranteed by design, characterization and process control.
threshold and output current proportionally.
Pin No.
Duty cycle range of PWM signal
applied to ADJ pin during PWM
dimming mode
Brightness control range
Operating frequency
(See graphs for more detail)
Minimum switch ‘ON’ time
Minimum switch ‘OFF’ time
Recommended maximum operating
frequency
Recommended duty cycle range of
output switch at f
Internal comparator propagation
delay
Parameter
1
2
3
4
5
Drain of NDMOS switch
Ground (0V)
Multi-function On/Off and brightness control pin:
•
•
•
•
•
Connect resistor R
(Note: R
Input voltage (7V to 30V). Decouple to ground with 1µF or higher X7R ceramic capacitor close to
device
Description
Leave floating for normal operation.(V
I
Drive to voltage below 0.2V to turn off output current
Drive with DC voltage (0.3V<V
Drive with PWM signal from open-collector or open-drain transistor, to adjust output current.
Adjustment range 1% to 100% of I
Connect a capacitor from this pin to ground to define soft-start time. Soft-start time is
approx.0.5ms/nF)
OUTnom
Reel size
SMIN
LXmax
(mm)
180
=0.1/R
=0.27
(test conditions: V
ADJ
S
S
)
from this pin to V
with ADJ pin open-circuit)
= V
ADJ(nom)
Reel width
PWM frequency 100Hz - 1KHz
PWM amplitude= V
Measured on ADJ pin
ADJ pin floating
L=100µH (0.82 )
I
Driving 1 LED
LX switch ‘ON’
LX switch ‘OFF’
OUT
Conditions
(mm)
8
= V
ADJ
IN
=350mA @ V
=12V, T
REF
<2.5V) to adjust output current from 25% to 200%
IN
OUTnom
3
. Driving the ADJ pin above V
to define nominal average output current I
ADJ
amb
= V
for 100Hz < f < 1KHZ
LED
=25°C unless otherwise stated) (*) (continued)
REF
REF
=3.4V
Quantity per reel
=1.25V giving nominal average output current
3,000
Min.
0.01
200
200
0.3
REF
1000:1
Typ.
250
50
will increase the V
ZXLD1352
www.diodes.com
www.zetex.com
Device mark
Max.
OUTnom
0.7
1
1
1352
(†)
of I
=0.1/R
Unit
OUTnom
MHz
KHz
ns
ns
ns
SENSE
S