ZXLD1370_11 DIODES [Diodes Incorporated], ZXLD1370_11 Datasheet - Page 29

• Manufacturer Part Number: ZXLD1370_11
• Description: 60V HIGH ACCURACY BUCK/BOOST/BUCK-BOOST LED DRIVER CONTROLLER
• Manufacturer: DIODES [Diodes Incorporated]

ZXLD1370
Document number: DS32165 Rev. 3 - 2
Applications Information
PCB Layout considerations
PCB layout is a fundamental activity to get the most of the device in all configurations. In the following section it is possible
to find some important insight to design with the ZXLD1370 both in Buck and Buck-Boost/Boost configurations.
Here are some considerations useful for the PCB layout:
APPLICATION EXAMPLES
Example 1:
2.8A Buck LED driver
In this application example, the ZXLD1370 is connected as a buck LED driver. The schematic and parts list are shown
below. The LED driver is able to deliver 2.8A of LED current with an input voltage range of 8V to 24V. In order to achieve
high efficiency at high LED current, a Super Barrier Rectifier (SBR) with a low forward voltage is used as the free wheeling
rectifier.
This LED driver is suitable for applications which require high LED current such as LED projector, automatic LED lighting
etc.
Inductor, Switch
and
Freewheeling
diode
placed as close together as possible.
than 5mm from the SHP pin.
2.2uF, X7R, 100V (C3 and C4). In addition to these capacitors, it is suggested to add two ceramic capacitors of
1uF, X7R, 100V each (C2, C8), as well as a further decoupling capacitor of 100nF close to the VIN/VAUX pins (C9).
VIN and VAUX pins can be short-circuited when the device is used in buck mode, or can be driven from a separate
supply.
In order to avoid ringing due to stray inductances, the inductor L1, the anode of D1 and the drain of Q1 should be
The shaping capacitor C1 is fundamental for the stability of the control loop. To this end it should be placed no more
Input voltage pins, VIN and VAUX, need to be decoupled. It is recommended to use two ceramic capacitors of
(Continued)
Figure 38: Circuit Layout
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SHP pin
V
decoupling
IN
/ V
© Diodes Incorporated
ZXLD1370
AUX
February 2011