Datasheet
Demonstration board description AN3134
6/10 Doc ID 16960 Rev 1
The input lines EN, BRAKE and F/R are connected to ground through a pull-down resistor
which sets the default logic level to “low”. An external signal can be applied to change each
input status. The Hall effect inputs H1, H2 and H3 have a pull-up resistor connected to the
V
DD
voltage, which can be provided by the VDD pin.
A charge pump circuit, made up of D1, C3 and C4, generates the supply voltage for the
high-side integrated MOSFETs. Due to voltage and current switching at relatively high
frequency, these components are connected through short paths in order to minimize
induced noise in other circuits.
R4 and C5 are used by the integrated overcurrent protection circuitry to set the protection
timings (disable time t
DISABLE
is about 200 µs and delay time t
DELAY
is about 1 µs, based on
the values in Tabl e 3 ).
R8 and C6 are used to set the off-time t
OFF
of the PWM to about 50 µs. When changing the
RC network value, the off-time should be adjusted according to the electrical characteristics
and supply voltage of the motor.
R11, R12 and C8 are low-pass filters to provide an external reference voltage through the
PWM output of a microcontroller.
R9 and C7 are used to set the off-time t
PULSE
of the TACHO pin. The TACHO output signal
can be used to implement a simple frequency-to-voltage converter (speed loop control).
Figure 4, Figure 5 and Figure 6 show the component placement and the two-layer layout of
the EVAL6229QR demonstration board. A GND area is used for the IC power dissipation.
Table 3. EVAL6229QR component list
Part reference Part value Part description
C1 220nF/100V Capacitor
C2 100µF/63V Capacitor
C3 10nF/25V Capacitor
C4, C8 220nF/25V Capacitor
C5 5.6nF Capacitor
C6 820pF Capacitor
C7 10nF Resistor
D1 BAT46SW Diodes
R1, R2, R3, R4 100kΩ 5% 0.25W Resistor
R5, R6, R7 10kΩ 5% 0.25W Resistor
R8 100kΩ 1% 0.25W Resistor
R9 20kΩ 1% 0.25W Resistor
R10 0.4Ω 1W Resistor
R11 20kΩ 5% 0.25W Resistor
R12 2kΩ 5% 0.25W Resistor
U1 L6229Q 3-phase BLDC motor driver in VFQFPN5x5