ZXLD1350EV4
Zdb346R1. 05-01-2007
2/8
ZXLD1350EV4 User Guide
ZXLD1350 DEVICE DESCRIPTION
The ZXLD1350 is a continuous mode inductive driver in a TSOT23-5 package, for driving one or more series
connected LEDs efficiently from a voltage source higher than the LED voltage. The device includes the output
switch and a current sense circuit, which requires an external sense resistor to set the nominal current up to
350mA.
ZXLD1350 DEVICE FEATURES
•
Drives one or more series-connected 1W white
LEDs up to 350mA.
•
Internal
30V
switch.
•
Wide input voltage: 7V to 30V.
•
Inherent open circuit LED protection.
•
Brightness control using DC or PWM.
•
Internal
PWM
filter.
DEVICE APPLICATIONS
•
LED
flashlights.
•
High Power LED driving.
•
Low-voltage halogen replacement LEDs.
•
Automotive
lighting.
•
Illuminated
signs.
ZXLD1350 Device Packages, Pin and Definitions
TSOT23-5 pack
ZXLD1350 Device Pin Definition
Name Pin
No
Description
LX 1
Drain
of
NDMOS
switch.
GND 2
Ground
(0V).
ADJ
3
Internal voltage ref. pin (1.25V) :
•
Leave floating for normal operation.
•
Connect to GND to turn off output current.
•
Drive with DC voltage (0.3V to 1.25V) or with PWM signal to adjust
output current or....
•
Connect a capacitor from this pin to ground to set soft-start time.
ISENSE
4
Connect a sense resistor, Rs,
from the ADJ pin to VIN to sense the nominal
output current. Nominal I
out
= 0.1/ Rs
VIN
5
Input voltage: 7V to 30V. Decouple to ground with a 1uF or higher ceramic
capacitor.
ORDERING INFORMATION
EVALBOARD ORDER NUMBER
ZXLD1350EV4
Please note: Evaluation boards are subject to
availability and qualified leads.
DEVICE ORDER NUMBER
ZXLD1350E5TA
