HA13563 Datasheet, PDF (8/18 Pages) Hitachi Semiconductor – Three-Phase Brushless Motor Driver

HA13563/V
5. Determine the component value using the following formula as a guideline:
C108 (µF) = ²²⁰
ffg (Hz)
Digital filter time T_MASK of FG signal is determined as follows.
T_MASK (sec) =
1
CLK × D2
∼
2
CLK × D2
where, CLK : The reference frequency.
D2 : CLK frequency dividing ratio.
FG signal
wave shaping output
After digital filter
T_MASK
T_MASK
6. The PWM carrier frequency is determined roughly by the following formula:
f_PWM
=
Rt
1180
(kΩ) Ct1
(pF)
×
10³
7. The formula shown below roughly determines the time, Tprot (s), until the stuck rotor protection
circuit operates. Figure 2 shows the operating waveforms. The latched state can be cleared by
either CE or V_CC. Note that a capacitor with a leakage current sufficiently smaller than the
charging current Ict+ must be used.
Tprot = 0.24 Ct2 (µF)
V_CC
H
CE
L
Vref1
R_NF
I_RNF
0
Vth+0.7V
Vth
V_PROT
0
Tprot
V_HYS
LVI
Tset = 0.004 ⋅ Ct2 (µF) [sec]
Figure 2 Stuck Rotor Protection Operating Waveforms
8. The reference frequency CLK (Hz) and the FG frequency ffg (Hz) are related by the following
formula:
CLK = ^{1024 ffg}
D2
8