AD5560 Analog Devices, Inc., AD5560 Datasheet - Page 47

• Manufacturer Part Number: AD5560
• Description: 1.2 A Programmable Device Power Supply With Integrated 16-bit Level Setting Dacs
• Manufacturer: Analog Devices, Inc.

The AD5560 has three compensation modes. The power-on default mode is
into any load. Use Compensation Register 1 to configure the device for autocompensation, where the user inputs the CDUT and ESR
bits, and the AD5560 chooses the most appropriate compensation scheme for these load conditions.
Table 20. Compensation Register 1
Address
0x4
Default
0x0000
Bit
15
14
13
12
11
10
9
8
7
6:0
Name
CDUT[3:0]
ESR[3:0]
SAFEMODE
Reserved
Function
Use these control bits to tell the device how much capacitive load there is so that the device can
optimize the compensation used. Do not overestimate CDUT because this can cause oscillations.
Underestimating CDUT gives suboptimal but stable performance.
CDUT
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Use these control bits to tell the device how much ESR there is in series with CDUT so that the device can
optimize the compensation used. Do not underestimate ESR because this can cause oscillations.
Overestimating ESR gives suboptimal but stable performance.
ESR
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
SAFEMODE = 0 overrides values in Compensation Register 1 to make the force amplifier stable under
most load conditions. This mode is useful if it is unknown what the DPS is driving, but it does result in an
extremely slow response. The default operation on power-on or reset is SAFEMODE.
SAFEMODE settings are always g
Set this bit high to enable autocompensation.
Set to 0.
Rev. B | Page 47 of 60
CDUT Min
0 nF
50 nF
83 nF
138 nF
229 nF
380 nF
630 nF
1.1 μF
1.7 μF
2.9 μF
4.8 μF
7.9 μF
13 μF
22 μF
36 μF
60 μF
ESR Min
0 mΩ
1 mΩ
1.8 mΩ
3.4 mΩ
6.3 mΩ
12 mΩ
21 mΩ
40 mΩ
74 mΩ
140 mΩ
250 mΩ
460 mΩ
860 mΩ
1500 mΩ
2900 mΩ
6400 mΩ
m[1:0]
Data Bits, MSB First
= 2, R
SAFEMODE
P[2:0]
= 0,
R
Z
[2:0]
enabled. This ensures that the device is stable
= 0, C
C[3:1]
= 111, C
CDUT Max
50 nF
83 nF
138 nF
229 nF
380 nF
630 nF
1.1 μF
1.7 μF
2.9 μF
4.8 μF
7.9 μF
13 μF
22 μF
36 μF
60 μF
160 μF
ESR Max
1 mΩ
1.8 mΩ
3.4 mΩ
6.3 mΩ
12 mΩ
21 mΩ
40 mΩ
74 mΩ
140 mΩ
250 mΩ
460 mΩ
860 mΩ
1500 mΩ
2900 mΩ
5400 mΩ
10,000 mΩ
F[2:0]
= 5, and C
C0
= 1.
AD5560