Zetex Semiconductors PLC ZXLD1362EV3 - Manual (Page 2)

ZXLD1362EV3 User Guide issue 1 2/7 11-01-2008
ZXLD1362 DEVICE DESCRIPTION
The ZXLD1362 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
1000mA.
ZXLD1362 DEVICE FEATURES
•
Drives one or more series-connected LEDs
• LEDs up to 1000mA.
• Internal 60V switch.
• Wide input voltage: 7V to 60V.
• 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.
ZXLD1362 Device Packages, Pin and Definitions
TSOT23-5 pack
ZXLD1362 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 a DC voltage (0.3V to 1.25V) or with a PWM signal to adjust
output current
• Connect a capacitor from this pin to ground to set the 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/ R1
VIN 5 Input voltage: 7V to 60V. Decouple to ground with a 100nF and a 10uF or
higher ceramic capacitor depending on the input voltage[1].
ORDERING INFORMATION
EVALBOARD ORDER NUMBER
ZXLD1362EV3
Please note: Evaluation boards are subject to
availability and qualified leads.
DEVICE ORDER NUMBER
ZXLD1362E5TA