ir3500v International Rectifier Corp., ir3500v Datasheet - Page 14

• Manufacturer Part Number: ir3500v
• Description: Xphase3 Vr11.1 Cpu Vtt Control Ic
• Manufacturer: International Rectifier Corp.

Adaptive Voltage Positioning
Adaptive voltage positioning is implemented needed to reduce the output voltage deviations during load transients
and the power dissipation of the load at heavy load. The circuitry related to voltage positioning is shown in Figure 9.
The output voltage is set by the reference voltage VSETPT at the positive input to the error amplifier. This reference
voltage can be programmed to have a constant DC offset bellow the VDAC by connecting RSETPT between VDAC
and VSETPT. The IVSETPT is controlled by the ROSC as shown in Figure 10.
Page 14 of 34
IVSETPT
Remote
Sense
Amplifier
Figure 10 - ISETPT, OCSET with ROSC
Control IC
VDAC
VDRP
Amplifier
Figure 9 - Adaptive voltage positioning
Error
Amplifier
+
-
-
+
+
-
VSETPT
EAOUT
VDRP
FB
VDAC
IIN
VO
VOSEN+
VOSEN-
RDRP
RSETPT
RFB
ISHARE
VDAC
ISHARE
VDAC
Phase IC
Phase IC
3k
3k
Current Sense
Amplifier
Current Sense
Amplifier
+
-
+
-
CSIN+
CSIN-
CSIN+
CSIN-
July 03, 2008
IR3500V