Data Sheet
SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER
AM4961
Typical Application (Continued)
Note 7:
*7. HB Pin
*1. Ground Line Layout
This pin is available to output a 1.25V Hall bias voltage.
*8. VMIN Pin
PGND is connected to motor supply stage and GND is
connected to control stage. All ground lines from control
stage are connected to GND.
If this pin is disused, connect it directly with VPWM, the
minimum duty cycle will be 10%.
*2. Stability of Power Supply
*9. Exposed Pad (For TSSOP-20(EDP) package only)
C1 is employed to stabilize VCC. Its capacitance is no less
than 1µF.
*3. Hall Input
EXPOSED
PAD
To avoid noise, the shortest line is recommended to con-
nect with Hall stage which has about 20mV hysteresis.
Thus, the ideal Hall input is 50mV or over.
*9
*4. COSC Capacitor
When CCP is 100pF, the COSC frequency will be 25kHz.
There is an exposed pad at the bottom of IC. If operating
current is high, it is recommended to solder external
heatsink closely with this pad by tin to ensure better tem-
perature characteristics.
*5. FG Output
FG output terminal is open collector output which varies
with phase change.
*6. RD Output
RD output terminal is open collector output. It is low at
rotation mode and high when stopped.
Jun. 2008 Rev. 2. 2
BCD Semiconductor Manufacturing Limited
13
BCDSEMI [ BCD SEMICONDUCTOR MANUFACTURING LIMITED ]
