HA13609ANT Datasheet, PDF (20/31 Pages) Hitachi Semiconductor – Three-Phase Brushless Motor Driver

HA13609ANT
13. When setting up the current limiter filter consisting of R120 and C107, R120 should be 4.7kΩ or
larger, and C107 and R120 should function as a filter for the recovery current. This filter masks
the recovery current due to internal circuits for the current limiter input (pin 26) and the C107
discharge operation determines the PWM off time (by making the current limiter input a low
impedance). See the figures.
1/f_PWM
ON
ON
Output (U to W)
V_RNF
t_MASK
C107 discharge
t_MASK
Current limiter input
voltage (pin 26)
≈0V
For recovery current masking:
t_MASK =
48
fosc
to
64
fosc
[SEC]
@MD8 = 1
t_MASK =
24
fosc
to
32
fosc
[SEC]
@MD8 = 0
14. Use the formula below as a guideline for determining the values of R103, R104, and R122 to
R124 when a Hall IC is used.
R103 // R104 = R122 to R124 < 20kΩ
15. Take the current limiter input current (see the electrical characteristics) into consideration when
determining the values for R106 and R107.
16. Determine the values of R108 to R119 based on the characteristics of the output power
transistors used and the output driver characteristics (see the electrical characteristics).
17. Design the wiring in applications so that the potential of the pin 11 ground (the small-signal
ground) does not become higher than that of the pin 30 ground (the output stage ground) as
shown in the figure.
11 30
V_SS
20