ZXLD1370_11 Datasheet, PDF (1/35 Pages) Diodes Incorporated – 60V HIGH ACCURACY BUCK/BOOST/BUCK-BOOST LED DRIVER CONTROLLER

A Product Line of
Diodes Incorporated
ZXLD1370
60V HIGH ACCURACY BUCK/BOOST/BUCK-BOOST LED DRIVER CONTROLLER
Description
The ZXLD1370 is an LED driver controller IC for driving
external MOSFETs to drive high current LEDs. It is a multi-
topology controller enabling it to efficiently control the current
through series connected LEDs. The multi-topology enables
it to operate in buck, boost and buck-boost configurations.
The 60V capability coupled with its multi-topology capability
enables it to be used in a wide range of applications and
drive in excess of 15 LEDs in series.
The ZXLD1370 is a modified hysteretic controller using a
patent pending control scheme providing high output current
accuracy in all three modes of operation. High accuracy
dimming is achieved through DC control and high frequency
PWM control.
The ZXLD1370 uses two pins for fault diagnosis. A flag
output highlights a fault, while the multi-level status pin gives
further information on the exact fault.
Features
• 0.5% typical output current accuracy
• 6 to 60V operating voltage range
• LED driver supports Buck, Boost and Buck-boost
• configurations
• Wide dynamic range dimming
o 20:1 DC dimming
o 1000:1 dimming range at 500Hz
• Up to 1MHz switching
• High temperature control of LED current using TADJ
Pin Assignments
TSSOP-16 EP
Typical Application Circuit
Buck-boost diagram utilizing thermistor and TADJ
Curve showing LED current vs. T_LED
ZXLD1370
Document number: DS32165 Rev. 3 - 2
1 of 35
www.diodes.com
February 2011
© Diodes Incorporated