DP8105 5A DC-DC Intelligent dPOL Data Sheet
8V to 14V Input
•
0.7V to 5.5V Output
VOS: Output Voltage Set-Point
Address: 0x0B … 0x10
Coefficient
V1H First Vo Setpoint High Byte
V1L First Vo Setpoint Low Byte
V2H Second Vo Setpoint High Byte
V2L
Second Vo Setpoint Low Byte
V3H Third Vo Setpoint High Byte
V3L
Third Vo Setpoint Low Byte
Mapping:
- 12 bit data word, left aligned
- 1LSB = 2.5mV
Note:
- all registers are readable and writeable
- always write and read the high byte first
Figure 12. Output Voltage Set-point Register VOS
Addr
0x0B
0x0C
0x0D
0x0E
0x0F
0x10
Bits
8
8
8
8
8
8
Default
V
OUT
Upper Regulation
Limit
Operating
Point
VI Curve Without
Load Regulation
Lower Regulation
Limit
VI Curve With
Load Regulation
Headroom without
Load Regulation
Headroom with
Load Regulation
Light
Load
I
OUT
Heavy
Load
Figure 13. Optimal Voltage Positioning Concept
7.1.1
Output Voltage Margining
If the output voltage needs to be varied by a certain
percentage, the margining function can be utilized.
The margining can be programmed in the dPOL
2
Configuration window or directly via the I C bus
using high level commands as described in the
”DM7300 Digital Power Manager Programming
Manual”.
7.1.2
Output Load Regulation Control
If the output voltage needs to be varied by a certain
percentage, the margining function can be utilized.
The margining can be programmed in the dPOL
2
Configuration window or directly via the I C bus
using high level commands as described in the
”DM7300 Digital Power Manager Programming
Manual”.
In order to properly margin dPOLs that are
connected in parallel, the dPOLs must be members
of one of the Parallel Buses. Refer to the GUI
2
System Configuration Figure 11 or directly via the I C
bus. In the DP8105 Load Regulation can be set to
one of eight values: 0, 1.48, 2.95, 4.43, 5.9, 7.38
8.85, or 10.33 mv/A.
Figure 14 shows a DP8105 dPOL with 0 mv/A (load
current) regulation. Alternating high and low output
load currents causes large transients in Vout to
appear with each change.
Figure 14 Transient Response with Regulation set to 0 mV/A.
As the Load Regulation parameter is increased, step
offsets in output voltage begin to appear, as shown
in Figure 15.
BCD.00261 Rev. 1.0, 12 Feb 2013
www.power-one.com
Page 12 of 35
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