The AD5560 has three compensation modes. The power-on default mode is
參數(shù)資料
型號(hào)： EVAL-AD5560EBUZ
廠商： Analog Devices Inc
文件頁數(shù)： 44/68頁
文件大?。?/td> 0K
描述： BOARD EVALUATION FOR AD5560
標(biāo)準(zhǔn)包裝： 1
主要目的： 電源管理，電源監(jiān)控器/跟蹤器/序列發(fā)生器
已用 IC / 零件： AD5560
次要屬性： 串行接口
已供物品： 板
Data Sheet
AD5560
Rev. D | Page 49 of 68
The AD5560 has three compensation modes. The power-on default mode is SAFEMODE enabled. This ensures that the device is stable
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
Default
Data Bits, MSB First
0x4
0x0000
Bit
Name
Function
15
14
13
12
CDUT[3:0]
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
CDUT Min
CDUT Max
0
0 nF
50 nF
1
50 nF
83 nF
2
83 nF
138 nF
3
138 nF
229 nF
4
229 nF
380 nF
5
380 nF
630 nF
6
630 nF
1.1 F
7
1.1 F
1.7 F
8
1.7 F
2.9 F
9
2.9 F
4.8 F
10
4.8 F
7.9 F
11
7.9 F
13 F
12
13 F
22 F
13
22 F
36 F
14
36 F
60 F
15
60 F
160 F
11
10
9
8
ESR[3:0]
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
ESR Min
ESR Max
0
0 mΩ
1 mΩ
1
1 mΩ
1.8 mΩ
2
1.8 mΩ
3.4 mΩ
3
3.4 mΩ
6.3 mΩ
4
6.3 mΩ
12 mΩ
5
12 mΩ
21 mΩ
6
21 mΩ
40 mΩ
7
40 mΩ
74 mΩ
8
74 mΩ
140 mΩ
9
140 mΩ
250 mΩ
10
250 mΩ
460 mΩ
11
460 mΩ
860 mΩ
12
860 mΩ
1500 mΩ
13
1500 mΩ
2900 mΩ
14
2900 mΩ
5400 mΩ
15
6400 mΩ
10,000 mΩ
7
SAFEMODE
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 gm[1:0] = 2, RP[2:0] = 0, RZ[2:0] = 0, CC[3:1] = 111, CF[2:0] = 5, and CC0 = 1.
Set this bit high to enable autocompensation.
6:0
Reserved
Set to 0.
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