HA13532NT
External Conponents
Symbol
Recommended Value Purpose
Notes
Rnf
0.11 Ω ≤ Rnf ≤ 0.33 Ω Current sensing
1
Rt
51 k Ω
Reference current programming
2
Ct
1000 pF
Time constant for PWM carrier frequency 3
C101
≥ 0.1 µF
Power supply decoupling
C102, C103, C104
0.01 µF
Penetration current control
4
C105
1000 pF
Current sensing filter
R101
750 Ω
VR 101
100 kΩ
Motor current little adjustment
Notes: 1. The maximum motor drive current is:
Imax ≈ ±
Vdac + Voffs
Rnf
(1)
where, Vdac: DAC output voltage (see electrical characteristics)
Voffs: Offset voltage (see electrical characteristics)
2. The output sink current Iosnk, output source current Iosrc, and Ct charge/discharge currents Ict+
and Ict– are calculated as follows:
where, set Rt to be 2.5kΩ or higher.
Iosnk
≈
50Vrt
Rt
–
Vbe
Ru
(2)
Iosrc
≈
50Vrt
Rt
–
Vbe
Rd
(3)
Ict+, Ict– ≈
Vrt
Rt
(4)
where, Vrt: Rt voltage (see electrical characteristics)
Ru: pull-up resistance (see electrical characteristics)
Rd: pull-down resistance (see electrical characteristics)
Vbe: base-emitter voltage of driven transistor
3. The PWM carrier frequency fc is calculated as follows:
fc
≈
2Ct
Ict
(Vcth
–
Vctl)
(5)
≈
2CtRt
Vrt
(Vcth
–
Vctl)
(6)
where, Vcth: Ct high voltage (see electrical characteristics)
Vctl: Ct low voltage (see electrical characteristics)
4. Values of C102, C103, C104, C105, R101 are different from using power transistor
6