TB6572AFG*** Toshiba, TB6572AFG*** Datasheet - Page 12

• Manufacturer Part Number: TB6572AFG***
• Manufacturer: Toshiba

Specifications of TB6572AFG***

• Function: Controller
• Vopmax (vm*): 17V (30V)
• Io (lpeak): 20mA
• Sinusoidal Current Wave: yes
• Sensor-less: no
• Speed Feedback Loop: yes
• Package: QFP52
• Rohs Compatible†: yes

SEL1
(Hysteresis
The VCO input voltage (LP1 voltage) is a function of the frequency of the input clock (Fref), as shown below. The
peak voltage of the DOUT signal is divided by a factor that is selected by the SEL1 and SEL2 inputs.
The thresholds for the eight analog switches
are given below.
Each threshold point has a hysteresis of 20 mV.
The Dout resolution is selected by SEL1 and SEL2, as shown below.
The SEL1 and SEL2 inputs have a 25-kΩ pull-up resistor. These inputs are held high when undriven.
Max voltage
LP1 voltage
required)
selector
Threshold Voltage (typ.)
SEL1
H
H
L
L
SEL2
V1
V2
V3
V4
V5
V6
V7
8.1
SEL2
・
・
・
H
H
discriminator
L
L
Gain Control Circuitry
The gain control circuitry dynamically selects the gain of the speed discriminator, based on the rpm
command (i.e., Fref frequency). The gain control circuitry is designed to change the peak voltage of
the deviation signal from the speed discriminator, based on the Fref frequency.
S1
S2
S7
S8
0.357 V
0.714 V
1.071 V
1.429 V
1.786 V
2.143 V
Speed
2.5 V
S8 (max amplitude)
S8/S4
S8/S6/S4/S2
S8 to S1
Selector Output
GND
V
ref1
V1 to V2: S2 ON
V2 to V3: S3 ON
V3 to V4: S4 ON
V4 to V5: S5 ON
V5 to V6: S6 ON
V6 to V7: S7 ON
V7 to 5V: S8 ON
0 to V1: S1 ON
Analog Switch
S7
S8
S8
S1
S2
S7
S2
S1
(5 V)
2.25 V
Resolution
Output
1/2
1/4
1/8
FG signal
DOUT
12
3.5
0.5
2.5
1.5
3
2
1
0
0
Turns on during deceleration
Turns on during acceleration
500
Open output
1024 count
Low
C (VCO) = 33 pF
VCO Fref − LP1 Voltage
Dout
Acceleration
1000
This graph is presented only as a guide.
Fref (Hz)
Deceleration
1024 count
The range
between 2.25 V
and 1.0 V can be
divided into 8
steps.
1500
C (VCO) = 47 pF
C (VCO) = 82 pF
TB6572AFG
2000
2008-1-21
The range
between 3.5 V
and 2.25 V can
be divided into
8 steps.
High
2500