User Manual
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V 1.0
2021-08-25
XDPP1100 technical reference manual
Digital power controller
Voltage control
Table 24
Computed droop voltage by segment at high BW and low BW LPF inputs
Segment
Current range
vdroop_hibw
vdroop_lobw
neg
I < 0
I * rll_neg
0
seg1
0 < I < ithr_seg2
I * rll
0
seg2
ithr_seg2 < I ithr_seg3 ithr_seg2 * rll
(I - ithr_seg2) * rll_seg2
seg3
I > ithr_seg3
ithr_seg2 * rll
(ithr_seg3 - ithr_seg2) * rl (I - ithr_seg3) *
rll_seg3
5.4.2
Droop voltage filtering
The droop voltage outputs go to two independent low-pass filters (LPFs) as shown in
in the previous subsection. The filter BWs are programmed through registers:
•
vc_vavp_kfp
for the high BW LPF according to
•
vc_vavp_kfp_lobw
for the low BW LPF according to
Table 25
High BW AVP filter programming (F
s
= 25 MHz and LSB = 6.104e-5)
vc_vavp_kfp kfp
kfp_real
F3db (kHz) vc_vavp_kfp kfp
kfp_real
F3db (kHz)
0
4
0.0002
0.97
16
64
0.0039
15.60
1
5
0.0003
1.21
17
80
0.0049
19.52
2
6
0.0004
1.46
18
96
0.0059
23.45
3
7
0.0004
1.70
19
112
0.0068
27.39
4
8
0.0005
1.94
20
128
0.0078
31.33
5
10
0.0006
2.43
21
160
0.0098
39.24
6
12
0.0007
2.92
22
192
0.0117
47.18
7
14
0.0009
3.40
23
224
0.0137
55.15
8
16
0.0010
3.89
24
256
0.0156
63.16
9
20
0.0012
4.86
25
320
0.0195
79.26
10
24
0.0015
5.84
26
384
0.0234
95.49
11
28
0.0017
6.81
27
448
0.0273
111.86
12
32
0.0020
7.79
28
512
0.0313
128.35
13
40
0.0024
9.74
29
640
0.0391
161.74
14
48
0.0029
11.69
30
768
0.0469
195.68
15
56
0.0034
13.65
31
na
na
bypass
Table 26
Low BW AVP filter programming (F
s
= 25 MHz and LSB = 7.629e-6)
vc_vavp_kfp kfp
kfp_real
F3db (kHz) vc_vavp_kfp kfp
kfp_real
F3db (kHz)
0
4
0.0000
0.12
16
64
0.0005
1.94
1
5
0.0000
0.15
17
80
0.0006
2.43
2
6
0.0000
0.18
18
96
0.0007
2.92
3
7
0.0001
0.21
19
112
0.0009
3.40
4
8
0.0001
0.24
20
128
0.0010
3.89
5
10
0.0001
0.30
21
160
0.0012
4.86
6
12
0.0001
0.36
22
192
0.0015
5.84
