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Part: FAN8422G
Category:
Description: FAN8422G - 3-Phase BLDC Motor Driver
Company: Fairchild Semiconductor
Datasheet: Download FAN8422G datasheet File size : 400 kB
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FAN8422G
Floppy Disk Drive Spindle Motor Driver
Features
· Three-phase, full-wave, linear BLDC motor driver · Commutation with only two hall sensors · Generating index signal without an index hall sensor by special rotor magnetization · Built-in soft switching drive circuit · 300/360rpm selectable speed control circuit · Snubberless output drive · Chip enable function · Built-in current limit circuit · Built-in thermal shutdown circuit · Low output saturation voltage · TTL, 5V CMOS compatible digital inputs · Built-in current-mode control circuit (IPEAK: 1A)
Description
The FAN8422G is a monolithic integrated circuit suitable for a three-phase spindle motor driver of floppy disk drive systems. It can make index signals without an index hall sensor by special rotor magnetization.
30-SSOP-375
1
Typical Application
· 3.5-inch floppy disk drive(FDD) spindle motor driver
Ordering Information
Device FAN8422G Package 30-SSOP-375 Operating Temp. 0 ~ 75°C
Rev. 1.0.1
©2003 Fairchild Semiconductor Corporation
FAN8422G
Pin Assignments
FG INPUT(-) AGC INDEX PULSE WIDTH VOLTAGE REGULATOR INDEX BURST INDEX OUTPUT CE SIGNAL GROUND SIGNAL GROUND FG ZERO CROSS FG OUTPUT RPM SELECT CHARGE PUMP OUTPUT OSC INPUT NC
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
FG INPUT(+) HALL BIAS CURRENT DETECTION1 V INPUT(-) V INPUT(+) U PHASE OUTPUT V PHASE OUTPUT SIGNAL GROUND W PHASE OUTPUT NC U INPUT(+) U INPUT(-) CURRENT DETECTION2 VCC PHASE COMPENSATION
FAN8422G
2
FAN8422G
Pin Definitions
Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Pin Name FG_INPUT (-) AG C INDEX PULSE WIDTH VOLTAGE REGULATOR INDEX BURST INDEX OUTPUT CE SIGNAL GROUND SIGNAL GROUND FG ZERO CROSS FG OUTPUT RPM SELECT CHARGE PUMP OUTPUT OSC INPUT NC PHASE COMPENSATION VCC CURRENT DETECTION2 U INPUT (-) U INPUT (+) NC W PHASE OUTPUT SIGNAL GROUND V PHASE OUTPUT U PHASE OUTPUT V INPUT (+) V INPUT (-) CURRENT DETECTION1 HALL BIAS FG INPUT (+) I/O I I O O O O I O O I O I I I I I O O O I I I I I Pin Function Description Negative Input Pin FG Signal Amp. Automatic Gain Control Input Pin Index Pulse Width Detection Pin Voltage Generator Output Pin Index Pulse Width Detection Pin Index Pulse Output Pin Chip Enable (Active Low) Signal Ground Signal Ground FG Signal Zero Cross Detection Pin FG Signal Output Pin RPM Selection Pin (L: 300, H: 360rpm) Charge Pump Output Pin 1MHz Oscillation Input Pin No Connection Phase Compensation Cap. Connection Pin 5V Power Supply Pin Over Current Detection Pin Negative Input Pin of U Phase Amp Positive Input Pin of U Phase Amp No Connection W Phase Output Pin Signal Ground V Phase Output Pin U Phase Output Pin Positive Input Pin of V Phase Amp Negative Input Pin of V Phase Amp Over Current Detection Pin Hall Sensor Bias Input Pin Positive Input Pin of FG Signal Amp
3
FAN8422G
Internal Block Diagram
CURRENT CURRENT DETECTION2 DETECTION1 18 28
V CC 17
U INPUT(+) 20 U INPUT(-) 19 V INPUT(+) 26 V INPUT(-) 27 AGC 2
+ U_AMP - + V_AMP -
U_OUT
25
U PHASE OUTPUT
Output control
V_OUT
24
V PHASE OUTPUT
AGC W_OUT 22 W PHASE OUTPUT
HALL BIAS 29
Start-up
Hall zero-cross TSD
CE
7
CE CON_AMP 1.3V - + 0.24V 16 FG zero-cross - 0.69V BUF_AMP + PHASE COMPENSATION
FG INPUT(+) 30 FG INPUT(-) 1
FG_AMP + -
FG OUTPUT 11 FG ZERO 10 CROSS Timing detector VOLTAGE REGULATOR INDEX BURST 4 2.2V 5 OSC RPM select Clock divider Speed control Burst time circuit
Pulse width adjustment
6
INDEX OUTPUT INDEX PULSE WIDTH CHARGE PUMP OUTPUT
3 Charge pump
13
OSC INPUT 14
12 RPM SELECT
9
8
23
15
21 NC
SIGNAL GROUND
4
FAN8422G
Absolute Maximum Rating (Ta=25°C)
Parameter Maximum Power Supply Voltage Maximum Input Voltage Maximum Output Current Continuous Output Current Power Dissipation Operating Temperature Junction Temperture Storage Temperature Sym bol VCCMAX VINMAX IOMAX IO PD TA TJ T STG Value 7.0 0 ~ V CC 1 0.7 1.5 0 ~ 75 150 -55 ~ +125 Unit V V A A W °C °C °C
Power Dissipation Curve
2.0 1.5 1.0 0.5 0
Power Dissipation : PD[W]
0
25
50
75
100
125
150
175
Ambient temperature, Ta [°C]
Power dissipation decreases in the rate of 12mW / °C when mounted on 76.2mm × 114.3mm × 1.6mm PCB (Phenolic resin material) and used above Ta=25°C.
Recommended Operating Conditions (Ta=25°C)
Parameter Supply Voltage Ambient Operating Temperature Range Symbol VCC Ta Min. 4.5 0 Typ. 5.0 Max 5.5 70 Un i t V °C
Temperature Characteristic
Parameter Thermal Shutdown Temperature
Note: Design reference value
Note
Symbol TSD
Min. 125
Typ. 150
Max -
Un i t °C
5
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