ir3500a International Rectifier Corp., ir3500a Datasheet - Page 43

• Manufacturer Part Number: ir3500a
• Description: Xphase3 Vr11.0 & Amd Pvid Control Ic
• Manufacturer: International Rectifier Corp.

LAYOUT GUIDELINES
The following layout guidelines are recommended to reduce the parasitic inductance and resistance of the PCB
layout, therefore minimizing the noise coupled to the IC.
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•
•
•
•
•
•
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Dedicate at least one middle layer for a ground plane LGND.
Connect the ground tab under the control IC to LGND plane through a via.
Place VCCL decoupling capacitor VCCL as close as possible to VCCL and LGND pins.
Place the following critical components on the same layer as control IC and position them as close as possible
to the respective pins, R
Place the compensation components on the same layer as control IC and position them as close as possible to
EAOUT, FB, VO and VDRP pins. Avoid using any via for the connection.
Use Kelvin connections for the remote voltage sense signals, VOSNS+ and VOSNS-, and avoid crossing over
the fast transition nodes, i.e. switching nodes, gate drive signals and bootstrap nodes.
Avoid analog control bus signals, VDAC, IIN, and especially EAOUT, crossing over the fast transition nodes.
Separate digital bus, CLKOUT, PHSOUT and PHSIN from the analog control bus and other compensation
components.
LGND
LGND
PLANE
PLANE
To
To
LGND
LGND
Page 43 of 47
R
R
To OVP
To OVP
Circuit
Circuit
VCCL2
VCCL2
Phase ICs
Phase ICs
To
To
To VIN
To VIN
OSC
, R
VCCLDRV
VCCLDRV
PHSOUT
PHSOUT
CLKOUT
CLKOUT
VCCLFB
VCCLFB
PHSIN
PHSIN
OCSET
VIDSEL
VIDSEL
VRRDY
VRRDY
VCCL
VCCL
R
R
OSC/OVP
OSC/OVP
, R
VDAC
, C
VDAC
To SYSTEM
To SYSTEM
, and C
SS/DEL
EAOUT
EAOUT
FB
FB
VO
VO
VOSNS+
VOSNS+
VOSNS-
VOSNS-
HOTSET
HOTSET
VRHOT
VRHOT
ENABLE
ENABLE
. Avoid using any via for the connection.
July 3, 2008
IR3500A
To Voltage
To Voltage
Remote
Remote
Sense
Sense
Thermistor
Thermistor
To VCCL
To VCCL
Phase
Phase
Thermistor
Thermistor
ICs
ICs
To
To
To
To
To
To