FAN8729 Fairchild Semiconductor, FAN8729 Datasheet - Page 12

• Manufacturer Part Number: FAN8729
• Description: Motor / Motion / Ignition Controllers & Drivers BLDC+4CH BTL
• Manufacturer: Fairchild Semiconductor
• Type: Spindle Motor Controllerr

Specifications of FAN8729

• Operating Temperature Classification: Commercial
• Package Type: PQFP
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 13.2V
• Operating Supply Voltage: 4.5 V to 13.2 V
• Supply Current: 16.5 mA
• Mounting Style: SMD/SMT
• Package / Case: QFPH-48
• Lead Free Status / RoHS Status: Compliant

4. CH1,2,3,4 Balanced Transformerless (BTL) Drive
• Diagram above shows each input/output BTL channel structure.
• When BTL input voltage is V
• BTL Channel’s output voltage is found as follows;
• BTL gain value is found as follows;
Vref123,4
19 20
21 22
37 41
Vin
ref
Do
Do
R1
, the output voltage is P
+
−
=
=
Pr
Pr
R2
ef
ef
−
+
Gain
R
R
R
R
2
1
2
1
LEVEL
SHIFT
×
×
=
P
P
1 (
1 (
ref
4
ref
ref
×
+
+
. P
R
R
R
R
R
R
ref
1
2
3
3
3
3
R3
R3
)
)
has the value of VM/2.
×
×
(
(
Vin
Vin
−
−
R3
Vref
Vref
R3
)
)
DO+
DO-
M
34
29 27
35
30
32
33
28
FAN8729
12