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ADP3181JRUZ-REEL Datasheet(PDF) 11 Page - Analog Devices

Part # ADP3181JRUZ-REEL
Description  5-Bit or 6-Bit Programmable 2-,3-,4-Phase Synchronous Buck Controller
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADP3181JRUZ-REEL Datasheet(HTML) 11 Page - Analog Devices

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ADP3181
Rev. A | Page 11 of 24
VOLTAGE CONTROL MODE
A high gain-bandwidth voltage mode error amplifier is used for
the voltage-mode control loop. The control input voltage to the
positive input is set via the VID logic. This voltage is also offset
by the droop voltage for active positioning of the output voltage
as a function of current, commonly known as active voltage
positioning. The output of the amplifier is the COMP pin,
which sets the termination voltage for the internal PWM ramps.
The negative input (FB) is tied to the output sense location with
a resistor RB and is used for sensing and controlling the output
voltage at this point. A current source from the FB pin flowing
through RB is used for setting the no-load offset voltage from
the VID voltage. The no-load voltage is negative with respect to
the VID DAC. The main loop compensation is incorporated in
the feedback network between FB and COMP.
Table 5. VR 10 VID Codes for the ADP3181, CPUID Used As a VID5 Input
VID4
VID3
VID2
VID1
VID0
CPUID
Output
VID4
VID3
VID2
VID1
VID0
CPUID
Output
1
1
1
1
1
1
No CPU
1
1
0
1
0
0
1.2125 V
1
1
1
1
1
0
No CPU
1
1
0
0
1
1
1.2250 V
0
1
0
1
0
0
0.8375 V
1
1
0
0
1
0
1.2375 V
0
1
0
0
1
1
0.8500 V
1
1
0
0
0
1
1.2500 V
0
1
0
0
1
0
0.8625 V
1
1
0
0
0
0
1.2625 V
0
1
0
0
0
1
0.8750 V
1
0
1
1
1
1
1.2750 V
0
1
0
0
0
0
0.8875 V
1
0
1
1
1
0
1.2875 V
0
0
1
1
1
1
0.9000 V
1
0
1
1
0
1
1.3000 V
0
0
1
1
1
0
0.9125 V
1
0
1
1
0
0
1.3125 V
0
0
1
1
0
1
0.9250 V
1
0
1
0
1
1
1.3250 V
0
0
1
1
0
0
0.9375 V
1
0
1
0
1
0
1.3375 V
0
0
1
0
1
1
0.9500 V
1
0
1
0
0
1
1.3500 V
0
0
1
0
1
0
0.9625 V
1
0
1
0
0
0
1.3625 V
0
0
1
0
0
1
0.9750 V
1
0
0
1
1
1
1.3750 V
0
0
1
0
0
0
0.9875 V
1
0
0
1
1
0
1.3875 V
0
0
0
1
1
1
1.0000 V
1
0
0
1
0
1
1.4000 V
0
0
0
1
1
0
1.0125 V
1
0
0
1
0
0
1.4125 V
0
0
0
1
0
1
1.0250 V
1
0
0
0
1
1
1.4250 V
0
0
0
1
0
0
1.0375 V
1
0
0
0
1
0
1.4375 V
0
0
0
0
1
1
1.0500 V
1
0
0
0
0
1
1.4500 V
0
0
0
0
1
0
1.0625 V
1
0
0
0
0
0
1.4625 V
0
0
0
0
0
1
1.0750 V
0
1
1
1
1
1
1.4750 V
0
0
0
0
0
0
1.0875 V
0
1
1
1
1
0
1.4875 V
1
1
1
1
0
1
1.1000 V
0
1
1
1
0
1
1.5000 V
1
1
1
1
0
0
1.1125 V
0
1
1
1
0
0
1.5125 V
1
1
1
0
1
1
1.1250 V
0
1
1
0
1
1
1.5250 V
1
1
1
0
1
0
1.1375 V
0
1
1
0
1
0
1.5375 V
1
1
1
0
0
1
1.1500 V
0
1
1
0
0
1
1.5500 V
1
1
1
0
0
0
1.1625 V
0
1
1
0
0
0
1.5625 V
1
1
0
1
1
1
1.1750 V
0
1
0
1
1
1
1.5750 V
1
1
0
1
1
0
1.1875 V
0
1
0
1
1
0
1.5875 V
1
1
0
1
0
1
1.2000 V
0
1
0
1
0
1
1.6000 V


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