BD6326NUX Datasheet, PDF (10/25 Pages) Rohm – Speed controllable by PWM input signal

BD6326NUX
Datasheet
1.3 U, V, W phase and FG output signals
The timing charts of the output signals from the U, V and W phases as well as the FG terminal (at FR = Hi or no connected)
is shown (Figure 20).
The detection of the BEMF voltage does with output U and detects the position of the motor rotation. The three phases are
driving in the order of U, V and W phases. About FG signal output, assuming that a three-slot tetrode motor is used, two
pulse outputs of FG are produced for one motor cycle.
STAGE
Position[deg] 0
60
120
180
240
300
360
60
120
180
240
300
360
Output Voltage
U
Output Voltage
V
Output Voltage
W
FG signal
Position
U
UU
U
U
U
U
U
U
U
UU
U
U
U
U
U
U
V W _{V WV W V W V W} V W _{V W V W V W V W V W V W V W V W V W V W V W V W}
Figure 20. Timing chart of U, V, W, FG output signal (FR= Hi or no connect)
Table 3. Truth table of normal operation
Output pattern
1
2
3
4
5
6
Motor output U
PWM
PWM
PWM_→Hi-Z_（BEMF detect)
PWM_→L
L
L_→PWM
* About the output pattern, It changes in the flow of “1→2→3 ～ 6→1”.
H; High, L; Low, Hi-Z; High impedance
Motor output
Motor output V
L
L_→PWM
PWM
PWM
PWM
PWM_→L
Motor output W
PWM
PWM_→L
L
L_→PWM
PWM
PWM
FG signal is masked between synchronized driving section (FG = Hi level). The FG signal is output from Rotation speed
monitor section.
start
PWM
Output voltage
U
Output voltage
V
Output voltage
W
FG
FG mask mode driving (The synchronized driving)
Figure 21. About FG mask section
FG normal output
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
10/22
TSZ02201-0H1H0B100530-1-2
11. Dec. 2014 Rev.002