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UTC A9849
LINEAR INTEGRATED CIRCUIT
3-phase motor driver for CD-ROMs
DESCRIPTION
The UTC A9849 is ICs developed for CD-ROM spindle motor drives. These ICs possess a short brake and reverserotation brake for two types of brake functions, and also contain FG output and rotation direction detection (FR) circuits,making them high-functionality and high-performance ICs.
FEATURES
* Three-phase, full-wave, pseudo-linear drive system. * Built-in power save and thermal shutdown functions. * Built-in current limiter and Hall bias circuits. * Built-in FG output. * Built-in rotation direction detector. * Built-in reverse rotation prevention circuit. * Built-in short brake pin.
HSOP-28
APPLICATION
* CD-ROM, CD-R, CD-RW, DVD-ROM, and DVD-RAM
ABSOLUTE MAXIMUM RATINGS(Ta =25C )
PARAMETER
Applied Voltage ( with 5V Power Supply) Applied Voltage ( motor Power Supply1 ) Applied Voltage ( motor Power Supply2) Power Dissipation Operating Temperature Storage Temperature Output Current Note 2:Tj should not exceed 150C Note 3:Tj should not exceed Pd or ASO value.
SYMBOL
Vcc VM1 VM2 Pd Topr Tstg Io
VALUE
7 16 16 2200(note1) -20 ~ 75 -55 ~ 15 (Note 2) 1300 (Note 3)
UNIT
V V V mW C C mA
Note 1:Reduced by 17.6mW for increase for Ta of 1C over 25C
RECOMMENDED OPERATING CONDITIONS(Ta =25C )
PARAMETER
Power Supply Voltage
SYMBOL
Vcc VM1 VM2
MIN
4.25 3.0 3.0
MAX
5.5 15 15
UNIT
V V V
UTC
UNISONIC TECHNOLOGIES CO., LTD.
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UTC A9849
BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
28 RNF DRIVER A8 2 CURRENT SENSE AMP 26 4 DRIVER +A1 7 TL Vcc 25 24 PS
TORQUE SENSE AMP
TSD
27
VM1 VM2 Vcc FG PS Ec ECR FR SB CNF VH
A2
GND
8
HALL AMP + + + + + DRQ CK Q + -
23 22 21 20 18 17 15
H1+ 9 H1- 10 H2+ 11 H2- 12 H3+ 13
Vcc
SHORT BRAKE
HALL BIAS
H3- 14
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UTC A9849
PIN DESCRIPTIONS
PIN NO.
2 4 7 8 9 10 11 12 13 14 15 17 18 20 21 22 23 24 25 26 27 28 FIN
LINEAR INTEGRATED CIRCUIT
PIN NAME
A3 A2 A1 GND H1
+
FUNCTOIN
Output Output Output GND Hall Signal Input Hall Signal Input Hall Signal Input Hall Signal Input Hall Signal Input Hall Signal Input Hall Bias For connection of phase compensation capacitor Short brake Rotation direction detection Output voltage control reference Output voltage control Power save FG signal output Power Supply Motor Power Supply 2 Motor Power Supply 1 For connection of output current detection resistor SUB GND
H1H2+ H2H3
+
H3VH CNF SB FR ECR EC PS FG Vcc VM2 VM1 RNF -
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UTC A9849
INPUT/OUTPUT CIRCUIT
(1) Power save 33K
PS
LINEAR INTEGRATED CIRCUIT
(2) Torque command input
1K
Ec
1K
ECR
10K
Fig.1 (3) Torque output (A1,A2,and A3)
Fig.2
VM1
VM2 External resistor (RNF) RNF
A1
A2
A3
GND Fig.3 (4) Hall input (H1+,H1-,H2+,H2-,H3+,H3-)
Hn+
1K
1K
Fig.4
Note: Resistance values are typical values.
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UTC A9849
(5) Hall Bias
LINEAR INTEGRATED CIRCUIT
VH (6) FG output
10K FG
100K
Fig.5 (7) FR output (8) Short brake 8K SB FR
Fig.6
30K
10K
Fig.8
Fig.7
Note: Resistance values are typical values.
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UTC A9849
PARAMETER
Total device Circuit current 1 Circuit current 2 Power save ON voltage range OFF voltage range Hall bias Hall bias voltage Hall amplifier Input bias current Same phase input voltage range Minimum input level H3 hysteresis levle Torque command Input Voltage range "-"offset voltage "+"offset voltage Input Bias Current I/O gain FG FG Output high level voltage FG Output low level voltage Duty (reference value) Rotation detection FR output high level voltage FR output low level voltage Output Output saturation high level voltage Output saturation low level voltage Pre-drive current Output limit current Short brake On voltage range
LINEAR INTEGRATED CIRCUIT
SYMBOL
Icc1 Icc2 VPSON VPSOFF VHB IHA VHAR VINH VHYS EC ECOFFECOFF+ ECIN GEC VFGH VFGL DU VFRH VFRL VOH VOL IVML ITL VFRH= -20A IFR= 3A IO= -600mA IO= 600mA EC=0V output open 560 3.5 1.5 4.1 0 ECR=2.5V ECR=2.5V ECR= EC EC=1.5V,2.0V IFG= -20A IFG=3mA 0.41 4.5 0 1.5 50 10 1.0 -80 20 -50 50 0.5 0.51 4.8 0.25 50 4.4 0.25 1.0 0.4 35 700 0.4 1.5 0.8 70 840 0.4 20 40 4.0 -20 80 2.0 0.61 IHB=10mA 3.5 0.5 0.9 0.7 1.5 3.0 4.0
ELECTRICAL CHARACTERISTICS
(Ta =25C ,VCC=5V,VM1=12V,VM2=12V,UNLESS OTHERWISE NOTED.)
TEST CONDITIONS
In the power save ON state In the power save OFF state
MIN
TYP.
0 4.1
MAX
0.2 6.5 1.5
UNIT
mA mA V V V A V mVp-p mV V mV mV A A/V V V % V V V V mA mA V V
VSBON OFF voltage range VSBOFF * Not designed forradiation resistance.
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UTC A9849
Circuit operation
LINEAR INTEGRATED CIRCUIT
(1) Hall input to coil output The phase relationship between the Hall input signals and the output current and voltage is shown in Fig.9. The motor position data input via the Hall pins is amplified by the Hall amplifier, and formed into waveforms by the matrix block.These signals are input to the output driver that supplies the drive current to the motor coils.
H1+
H2+
H3+
30 A1 output current H1-+H2+
A1 output voltage
A2 output current H2-+H3+
A2 output voltage
A3 output current H3-+H1+
A3 output voltage
Fig.9
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UTC A9849
LINEAR INTEGRATED CIRCUIT
(2) Torque command The RNF pin voltage with respect to the torque command (EC) is as follows:
Forward VM-RNF (V) Offset voltage " - " Offset voltage " + "
3mV 2.5 Fig.10 EC(V)
The I / O gain (GEC) from the EC pin to the RNF pin (output current) is determined by the RNF detector resistor. GEC = 0.255 / RNF [A / V] The torque limit current ITL is given by: ITL = 0.35 / RNF [A]
ROTATION DIRECTION
EcECR FORWARD REVERSE*
*Stops after detecting reverse (3) Reverse rotation detection function
H2+ H2H3+ H3-
+ + Ec ECR
D-FF DQ CK + Fig.11 H:Output .OPEN (HIGH-IMPEDANCE)
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UTC A9849
FORWARD REVERSE L H
LINEAR INTEGRATED CIRCUIT
FR SIGNAL OUTPUT PIN
The reverse detection circuit construction is shown in Fig.11. (1) Forward (EC < ECR) The phase relationship between the Hall input signals H2+ and H3+ becomes as shown in Fig.9, and the reverse rotation detection circuit does not operate. (2) Reverse (EC > ECR) The phase relationship between the signals H2+ and H3+ is opposite that for forward operation, and the reverse rotation detection circuit operates. The output goes OFF, and becomes open circuit. (4) Short brake When 3.5V or more is applied to the short brake pin, the upper-side output transistors of all go off, and the lowerside output transistors go on. Short braking operates regardless of the torque command signal. (5) Other circuits When 3.5V or more is applied to the power save pin, all circuits are on. When 1.5V or less is applied, the IC enters power save mode. Also, the Hall bias pins turn on and off with the power save pin.
Application example
RNF 28 DRIVER A3 2 A2 4 A1 7 GND 8 H1+ 9 HALL 1 H110 H2 + 11 HALL 2 H212 H3 + 13 HALL 3 H314 VM1 27 CURRENT SENSE AMP DRIVER +TL FG 24 PS TORQUE SENSE AMP + Vcc DRQ CK Q + + HALL BIAS SHORT BRAKE
RNF
TSD
VM2 26 Vcc 25 VM Vcc
Vcc
HALL AMP + + + -
PS 23 Ec 22 ECR 21 FR 20 SB 18 CNF 17 VH 15 SERVO SIGNAL
FIN
Fig.12
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UTC A9849
*Operation notes
LINEAR INTEGRATED CIRCUIT
(1) Power save The power save input is an I / O circuit like the own shown in Fig.1. The thermal derating characteristics of the power save pin is -8mV / C, and the resistance will fluctuate between 30% so be careful of the input voltage range. (2) Hall input The input circuit shown in Fig.4 is used for the Hall inputs. The Hall elements can be connected either in series or in parallel. (3) Thermal shutdown (TSD) When the junction temperature reaches 175C, the A1, A2, and A3 coil outputs go open circuit. The thermal shutdown has approximately 15C of hysteresis.
Vcc
Vcc
H1 H2 H3
H1
H2
H3
(Hall bias) Parallel connection
(Hall bias) Series connection
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UTC A9849
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTIC CURVES
Figure.14 Package Derating Characteristics 2.2 2.0 Figure.15 Power Supply Current vs.Power Supply Voltage
6.0 5.0 Circuit Current :Icc (mA) 4.0 3.0 2.0 1.0
Power Dissipation:Pd (W)
1.0
0
0
100 125 25 50 75 Ambient Temperature : Ta ()
150
0
0
5 6 1 2 3 4 Power Supply Voltage : Vcc(V)
7
Figure.16 Upper-side Output Saturation Voltage vs.Output Current VM Saturation Voltage: VOH (V) VM-0.2 VM-0.4 VM-0.6 VM-0.8 VM-1.0 VM-1.2 VM-1.4 0 200 800 400 600 Output Current :Io (mA) 1000 Saturation Voltage: VOL (V)
Figure.17 Low -side Output Saturation Voltage vs.Output Current 1.0 0.8
0.6
0.4
0.2 0
0
200 800 400 600 Output Current :Io (mA)
1000
UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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UNISONIC TECHNOLOGIES CO., LTD.
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