AD5757 View Datasheet(PDF) - Analog Devices
Part Name
Description
Manufacturer
AD5757 Datasheet PDF : 45 Pages
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Data Sheet
DC-to-DC Converters
To achieve high efficiency, good regulation, and stability, a well-
designed printed circuit board layout is required.
Follow these guidelines when designing printed circuit boards
(see Figure 57):
• Keep the low ESR input capacitor, CIN, close to AVCC
and PGND.
• Keep the high current path from CIN through the inductor,
LDCDC, to SWX and PGND as short as possible.
• Keep the high current path from CIN through LDCDC and the
rectifier, DDCDC, to the output capacitor, CDCDC, as short as
possible.
• Keep high current traces as shortand as wide as possible.
The path from CIN through the inductor, LDCDC, to SWX and
PGND must be able to handle a minimum of 1 A.
• Place the compensation components as close as possible to
COMPDCDC_x.
• Avoid routing high impedance traces near any node
connected to SWx or near the inductor to prevent radiated
noise injection.
AD5757
GALVANICALLY ISOLATED INTERFACE
In many process control applications,it is necessary to provide
an isolation barrier between the controllerand the unit being
controlled to protect and isolate the controlling circuitry from
any hazardous common-mode voltages that may occur. Analog
Devices iCoupler® products can provide voltage isolation in
excess of 2.5 kV. The serial loading structure of the AD5757
makes it ideal for isolated interfacesbecause the number of
interface linesis kept to a minimum. Figure 66 showsa 4-channel
isolated interface to the AD5757 using an ADuM1400. For
more information, visit www.analog.com.
MICROCONTROLLER
SERIAL CLOCK
OUT
ADuM1400*
VIA
ENCODE
SERIAL DATA VIB
OUT
ENCODE
SYNC OUT VIC
ENCODE
CONTROL OUT VID
ENCODE
DECODE
DECODE
DECODE
DECODE
VOA
TO SCLK
VOB
TO SDIN
VOC
TO SYNC
VOD
TO LDAC
*ADDITIONAL PINS OMITTED FOR CLARITY.
Figure 66. Isolated Interface
Rev. G | Page 43 of 45
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