User Manual
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V 1.0
2021-08-25
XDPP1100 technical reference manual
Digital power controller
Compensator
Peripheral Field name
Access Address
Bits
Description
VOUT_COMMAND*VOUT_SCALE_LO
OP - V(VSEN)
0: Clamp range = -40 to 40 mV
1: Clamp range = -80 to 80 mV
2: Clamp range = -120 to 120 mV
3: Clamp range = -160 to 160 mV
4: Clamp range = -200 to 200 mV
5: Clamp range = -240 to 240 mV
6: Clamp range = -280 to 280 mV
7: Clamp range = -318.75 to
318.75 mV
pid
pid_ff_dt_adj
RW
7000_1C00h
(pid0)
7000_2000h
(pid1)
[7:0]
PID FF adjustment for dead time.
Note that adjustment is always
positive because dead time reduces
duty cycle. Computed for:
Bridge topology:
pid_ff_dt_adj = T
dead
/ (T
switch
/ 2)
Non-bridge topology:
pid_ff_dt_adj = T
dead
/ T
switch
Example:
Bridge topology, T
dead
= 100 ns,
T
switch
= 4 µs
pid_ff_dt_adj = 100 ns / 2000 ns =
0.05
LSB = 2^-10, range = 0 to 0.2490
pid
pid_kp_ff_lpf
RW
7000_1C00h
(pid0)
7000_2000h
(pid1)
[12:8]
PID FF LPF coefficient. The
computed FF term is passed
through a LPF before being used by
the PID as part of the duty-cycle
calculation. This parameter sets the
BW of this filter. A setting of 31
bypasses the filter.
kfp_exp = pid_kp_ff_kpf[4:2]
kfp_man = 4 + pid_kp_ff_kpf[1:0]
kfp = kfp_man * 2^kfp_exp * 2^-9
F3db(MHz) = [kfp / (1 - kfp)] * 50
MHz / 2*pi
pid
pid_ff_gain_scale
RW
7000_1C00h
(pid0)
7000_2000h
(pid1)
[17:13] FF gain scale. This parameter may
be used to apply a gain to the
computed FF term. The typical
setting is 16, which corresponds to
a gain of 1.0.
LSB = 0.0625, range = 0.0 to 1.9375
pid
pid_ff_vrect_sel
RW
7000_1C00h
(pid0)
7000_2000h
(pid1)
[19:18] FF V
RECT
source select. FF is
computed as (V
OUT
/ V
RECT
) for
isolated and as (V
OUT
/ V
IN
) for non-
isolated buck-derived topologies.
Note that the FF computation may
be overriden entirely using
