LX1996ILQ MICROSEMI [Microsemi Corporation], LX1996ILQ Datasheet - Page 18

• Manufacturer Part Number: LX1996ILQ
• Description: Multi-string LED Back-light Controller
• Manufacturer: MICROSEMI [Microsemi Corporation]

Copyright © 2007
Rev. 1.0, 2007-12-14
O
The output capacitor is preferred to be ceramic for low ESR,
small size and relatively lower cost. The capacitor value needs
to be large enough to minimize the ripple voltage, which is
sensed at CS pins for the feedback current sink regulation. For
up to 42 LEDs, we recommend a minimum of 4.7uF; for larger
number of LEDs, use larger capacitor such as 6.8uF or 10uF.
O
A high switching frequency demands a high-speed rectifier. A
Schottky diode is recommended with a rating of 1A/60V. 1A
rating is more than adequate to meet the peak and average
current required. 60V rating is to cover up to OVP limit when
using 10LEDs per string.
S
The switching MOSFET should be an N-channel MOSFET with
a low RDS
Selection of a FET with the best combined low RDS
charge (Q
breakdown rating must be higher than the OVP setting.
Good candidates are Si3458DS or AM2358N.
WITCHING
UTPUT
UTPUT
C
D
g
TM
APACITOR
IODE
) will generally improve efficiency. The MOSFET
ON
M
OSFET
rated at V
S
ELECTION
S
S
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
ELECTION
ELECTION
GS
= 4.5V, and a low gate charge.
A P P L I C A T I O N I N F O R M A T I O N
Analog Mixed Signal Group
ON
Microsemi
®
and gate
Multi-string LED Back-light Controller
P
RODUCTION
D
ATASHEET
LX1996
Page 18