FAN8725 Fairchild Semiconductor, FAN8725 Datasheet - Page 18

• Manufacturer Part Number: FAN8725
• Description: Motor / Motion / Ignition Controllers & Drivers BTL Motor Drive IC 3Phase BLDCM+5CH
• Manufacturer: Fairchild Semiconductor
• Type: Spindle Motorr

Specifications of FAN8725

• Operating Temperature Classification: Commercial
• Package Type: QFPH
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 13.2V
• Operating Supply Voltage: 15 V
• Supply Current: 0.6 A
• Mounting Style: SMD/SMT
• Package / Case: QFPH-48
• Operating Temperature: - 35 C to + 85 C
• Lead Free Status / RoHS Status: Compliant

FAN8725 (KA3025)
12. BTL DRIVE PART
• The reference voltage REF is given externally through pin 42.
• The error amp output signal is amplified by R2 / R1 times and then fed to the power amp circuit.
• The power amp circuit produces the differential output voltages and drives the two output power amplifier circuit.
• Since the differential gain of the output amplifiers of CH1/CH2 is equal to 2 (25K / 10K) , the output signal of the error
• Since the differential gain of the output amplifiers of CH3/CH4/CH5 is equal to 2 (40K / 10K) , the output signal of the
• If the total gain is insufficient, the input error amp can be used to increase the gain.
• The CH1/CH2 are generally used as actuator drive circuit so this channels are not affected by TSD circuit.
amp is amplified by (R2 / R1)
error amp is amplified by (R2 / R1) 8.
(VM3)
23 40
VM2
R
27 29 32 34 36 DO
R
+
(VM3)
5.
VM2
(40K)
25K
Vref
42
+
Power amp
(40K)
25K
M
(40K)
25K
18
Error
Amp
17 19 21 24 38
DO+ 26 28 31 33 35
18 20 22
R1
(40K)
25K
R2
24 39