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AN8294S
Optical Disc Brush-less Spindle Motor Drive IC
s Overview
The AN8294S is an IC for driving the Optical Disc spindle motor. It employs three-phase full-wave soft switch driving system, and its current drive do not require the electrolytic capacitor between motor windings (snubber-less). It is suitable for 4 to 12 times speed CD-ROM spindle motor drive.
1 2 3 4 5 6 7 8 9 10 11 12
0.1 - 0.05 (0.05 ~ 0.1)
Unit : mm
0.4
s Features
* Three-phase full-wave soft switch system used and snubberless
24 23 22 21 20 19 18 17 16 15 14 13
* FG output and rotation direction detection output terminal * * * *
provided Current limitation function built-in, and voltage fall of detection resistance does not affect the saturation voltage Reverse rotation brake realized by voltage setting with EC/ECR Hall bias built-in Reverse rotation function built-in
0.5
(4.6) (6.0) 8.40.3 11.730.3
24-pin SOP Package (HSOP024-P-0450A)
s Pin Name
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 Symbol VH FG ECR EC SS RDS NC PCI VCC SG NC VM Pin name Hall bias terminal FG signal output terminal Torque command reference input terminal Torque command input terminal Start/Stop control terminal
Reverse rotation detection signal output terminal
Pin No. 13 14 15 16 17 18 19 20 21 22 23 24
Symbol CS2 CS1 A3 A2 A1 PG H1+ H1- H2+ H2
-
Pin name Current detection terminal 2 Current detection terminal 1 Drive output 3 Drive output 2 Drive output 1 Power GND terminal Hall element 1 positive input terminal Hall element 1 negative input terminal Hall element 2 positive input terminal Hall element 2 negative input terminal Hall element 3 positive input terminal Hall element 3 negative input terminal
NC
Current feedback system phase compensation terminal
Power supply terminal Signal GND terminal NC Motor power supply terminal
H3+ H3-
1.45
and turning off the motor current under high temperature
3.150.2
* Copper block with good heat radiation built-in. * Start/Stop terminal provided and power saved in stop mode * The thermal shunt down detecting the junction temperature
+ 0.15
1.45
0.2
(7.8) (9.2) 16.00.3
1.27
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VM=12V GND
10 12
s Block Diagram
VM RCS=0.5
14 19
CS1
Amp.
H1+
20
Upper Side Drive
H1-
21
Direction SW
17
H2+
Amp.
22
Amp.& Matrix
A1
16
Lower Side Drive
H2-
23 Direction Det. Det. 24
A2
15
H3+ H3-
Logic 1 Hall Bias EP=ER x EA
+
A3
VH
6
RDS
EA 4 Magnitude VTL Start /Stop Thermal Protector 5 13 8 9
Servo Torque Sig. EC
3
-
ECR
FG Comparator
2
FG FG
18
PG S/S CS2 0.1F CS1 High : Start System Controller VCC=5V VCC
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s Absolute Maximum Rating (Ta=25C)
Parameter Supply voltage Supply current Output current Note 1) Hall bias current Control signal input voltage Note 2) Power dissipation Operating ambient temperature Storage temperature Note 1) Pin No.=14, 15, 16, 17, 18 Note 2) Pin No.=3, 4, 5, 19, 20, 21, 22, 23, 24 Symbol VCC VM ICC IO (n) IHB Vn PD Topr Tstg Rating 7 14.4 30 1200 50 0 to VCC 909 (Ta=70C, Single unit) -20 to + 70 -55 to 150 Unit V mA mA mA V mW C C
s Recommended Operating Range (Ta=25C)
Parameter Operating supply voltage Symbol VCC VM Range 4.25V to 5.5V 4.5V to 14V
s Electrical Characteristics (Ta=252C)
Parameter Total Circuit current 1 Circuit current 2 Start/Stop Start voltage Stop voltage Hall Bias Hall bias voltage Hall Amp. Input bias current Common-mode input voltage range Minimum input level Torque Command Common-mode input voltage range Offset voltage Dead zone Input current Input/Output gain Output Output saturation voltage H Output saturation voltage L Torque limit current Idle voltage VOH VOL ITL Vidle VCC=5V, IO=-300mA VCC=5V, IO=300mA VCC=5V, RCS=0.5 VCC=5V, EC=ECR 560 0 0.9 0.2 700 1.4 0.45 840 7 V V mA mV EC EC OF EC DZ EC IN ACS VCC=5V VCC=5V VCC=5V VCC=5V, EC=ECR=2.5V VCC=5V, RCS=0.5 1 -150 50 -5 0.4 -1 0.5 0.6 3.9 150 150 V mV mV A A/V IBH VHBR VINH VCC=5V VCC=5V VCC=5V 1.5 60 1 5 4.0 A V mVP-P VHB VCC=5V, IHB=20mA 0.9 1.2 1.6 V Vstart Vstop Voltage which turns on the circuit when VCC=5V, LH Voltage which turns off the circuit when VCC=5V, HL 3.5 1.0 V V ICC1 ICC2 VCC=5V, Power Save VCC=5V, IO=0mA 0 7 0.1 14 mA mA Symbol Condition min typ max Unit
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s Electrical Characteristics (Ta=252C)
Parameter FG FG output high level FG output low level Common-mode input voltage range FG hysteresis width RDS RDS output high level RDS output low level Thermal Protection Thermal protection operation Note) Thermal protection hysteresis width Note) TSD ON DTSD VCC=5V, DEC=100mV VCC=5V, DEC=100mV 170 45 C C RDSH RDSL VCC=5V VCC=5V 4 0 VCC 1 V V FGH FGL VFGR HFG VCC=5V, IFG=-0.01mA VCC=5V, IFG=0.01mA Input D-range of H2+, H2- VCC=5V 1.5 5 10 3.0 VCC 0.5 3.0 20 V V V mV Symbol Condition min typ max Unit
Note) These are design reference values, but not guaranteed ones.
s Package Power Dissipation PD -Ta
(mW) 2,400 2,200 2,083 2,000 Glass epoxy board (50mm x 50mm x 1.2mm) Rthj-a=60C/W PD=2083mW (25C) Single unit Rthj-a=88C/W PD=1420mW (25C)
Power Dissipation PD (mW)
1,800 1,600 1,420 1,400 1,200 1,000 800 600 400 200 0 0 25 50 75 100 125
Ambient Temperature (Ta)
150 (C)
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s Pin Descriptions
Pin No. Pin name Standard waveform Description Equivalent circuit (Note)
100A 1
1
VH : Hall bias
Terminal supplying the current to the Hall element
1k 60k
VCC
2
FG : FG signal output
Terminal for comparison outputting "High" or "Low" according to signals of H2+, H2-.
50k 2
3
ECR : Torque command reference input Terminal inputting the command about what amount of current is flown into the motor
25A
25A
4
EC : Torque command input
7.5k 3 ECR 200A 200A 4 EC
5
S/S : Start/Stop control
Terminal turning on or off the IC. High : ON Low or Open : OFF
50k 5 30k
6
RDS : Reverse rotation detection signal output
Terminal outputting the "High" or "Low" which indicates normal or reverse rotation according to the Hall element signal. H3H2H1 for Low H1H2H3 for High
VCC 100A 6
7
NC
8
PCI : Current feedback system phase compensation
Terminal attaching the capacitor to compensate the phase for the current feedback loop
2k 8 1k
9
VCC : Supply voltage SG : Signal ground
Power supply terminal for IC
10
Note : The value shown above for such as bias current or resistance is not a guaranteed value, but a design reference one.
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s Pin Descriptions (cont.)
Pin No. 11 12 NC VM : Motor power supply Power supply terminal for supplying the power supply for motor drive Pin name Standard waveform Description Equivalent circuit
13
CS2 : current detection 2
Terminal connecting the resistance to the VM to detect the motor current amount. Normally, it is shorted with CS1.
14
CS1 : Current detection 1
Common collector terminal for upper side power Tr of A1, A2 and A3
15
A3 : Drive output 3
One of three output terminals which directly drive the motor by flowing the current in or out with two power Tr. For A1, A2 and A3, the waveform is deviated respectively by 120.
12
14
16
A2 : Drive output 2
Same as the above
50k 50k
50k
15 16 17
18
17
A1 : Drive output 1
Same as the above
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s Pin Descriptions (cont.)
Pin No. Pin name Standard waveform Description Equivalent circuit
18
PG : Power ground
Common emitter for lower side power Tr of A1, A2 and A3
19
H1+ : Hall element input
Two signals are developed from three Hall element respectively, and in total 6 signals are developed. Each signal is received by one of 6 terminals including this terminal. *Signal deviated by 180 from that for H1- is applied.
1k H+
1k H-
200A
20
H1- : Hall element input
Same as the above *Signal deviated by 180 from that for H1+ is appllied.
1k H+
1k H-
200A
21
H2+ : Hall element input
Same as for H1+ deviated *Signal that for H -by 180 from 2 is applied.
1k H+
1k H-
200A
22
H2- : Hall element input
Same as the above deviated *Signal that for H +by 180 from 2 is applied.
1k H+
1k H-
200A
23
H3+ : Hall element input
Same as the above *Signal deviated by - is 180 from that for H3 applied.
1k H+
1k H-
200A
24
H3 : Hall element input
-
Same as the above *Signal deviated by 180 from that for H3+ is applied.
1k H+
1k H-
200A
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s Function Description
1) Three-phase full-wave soft switch system, snubber-less
A1
A3
The AN8294S employs highly effective three-phase full-wave drive system, by which current is pulled out or sunk from/into each phase, A1, A2 and A3.
A2 Pulled out
Current switching for each phase is done with the trapezoid-wave-shaped linear switching current. The AN8294S applies the snubber-less drive system, which does not require the external capacitor at coil ends.
Sunk into Output current
2) Start/Stop terminal provided and power saved in stop mode The circuit operation starts by "H" signal. In stop mode, the entire circuit is turned off and the bias circuit current is not flown either. Thus consumption power becomes very small. 3) TSD (Thermal Shunt Down) The TSD detects the junction temperature, and when it exceeds the detection temperature (170 C, typ.), it turns off the motor current. Under this condition, the consumption power is low, almost the same as when the start/stop terminal is set to the stop condition. The TSD has hysteresis, and is automatically reset when the temperature decreases. The hysteresis width is set to 45C (typ.). 4) Current limitation The current limitation is achieved through detection of the voltage fall of the resistor (detection resistor) which is connected between Pins12, 13 and 14. The detection voltage is set to 0.35V (typ.). When 0.5 is connected between Pins12, 13 and 14, the limitation current is : 0.35V =0.70A 0.5 The fall of voltage between Pins12, 13 and 14 doesn't affect the rise of saturation voltage. In addition, Pins13 and 14 separate the drive system and sensor system. Pin14 CS1 is connected to the collector of upper side power Tr and functions as power supply which drive the coil. Pin13 CS2 functions as input for drive amp. of current feedback system. Pins13 and 14 should be shorted for use.
12 VM
Rcs
Vcs
14
Q1 Vcesat2 Q2 Vbe1 15 Vcesat1 V1
The V15 voltage of upper transistor block is given as follows : V15=VM-Vbe1-Vcesat2 or V15=VM-Vcesat1-Vcs Therefore, Vbe1+Vcesat2=Vcesat1+Vcs Vcesat1-Vcesat2=Vbe1-Vcs If the voltage drop Vcs does not exceed Vbe (the voltage between base and emitter of Q1), assuming that Q1 and Q2 have the same saturation voltage, the saturation voltage of upper side transistor block is not affected. The above calculation can be also applied to the other phases. The current limitation voltage is set to 0.35V. This voltage is lower than the voltage between base and emitter, and therefore the voltage fall due to detection resistance does not have a certain relationship with the saturation voltage, which affects the motor current. Thus, the AN8294S has the superior current detection system.
16
17
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5) Reverse rotation brake is available by EC/ECR voltage setting. The direction of torque applied to the motor can be changed by changing the sequence of current flowing in each output phase through voltage setting with EC/ECR. Voltage difference between EC and ECR is proportional to the motor torque (motor current) (V characteristics). 6) Hall Bias Built-in The AN8294S incorporates the power supply for Hall element, a position sensor. Hall bias voltage is 1.2V, typ. (VCC=5V, Hall current is 20mA). It is almost stable, even when the supply voltage is changed. In addition, Hall element may be connected either in series or in parallel.
VCC VCC
H1 H2 H3 H2 H1 H3
1 Parallel connection
1 Series connection
7) Reverse rotation prevention function
Hall input Hall amp. matrix
Logic
Direction detection
Forward rotation for L
PCI
ECR EC Comparator
EC < ECR for L
With Hall input, it detects the motor rotation direction. When the reverse rotation of motor is detected and the reverse rotation command, EC > ECR, is also developed at the same time, it cuts the motor current to stop the motor. 8) Torque Command and Output Current The voltage difference between EC terminal and ECR terminal controls the output current. (Refer to the following figure.)
VM - CS (VM-CS) max= 0.35V (typ.)
Dead zone 50 --150mV G
=
(VM-CS) (EC-ECR)
= 0.25 (typ.)
EC-ECR 0
The G shown in the above figure and (VM - CS) max. are almost stable, independent of current detection resistance (resistance between VM and CS terminals), RCS. For example, if Rcs = 0.5, * Transmission gain Acs from EC terminal voltage to output current is : G 0.25 ACS = = = 0.50 (A/V) (typ.) RCS 0.5 * Output maximum current ITL is : 0.35V ITL = = 0.70A (typ.) 0.5 The RCS should be set at the value of approximately 0.5 to 2.0.
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9) Phase relationship between Hall input and output currents. The phase relationship between Hall input and output currents when EC < ECR is shown in the following figure :
H1 H2 H3
Time
Pulled out
A3
A2
A1
Output current
Time
Sunk into
When EC > ECR, the pulling-out and sinking-into of the output current is just reversed from those shown in the above figure, and the motor rotation direction is reversed. For Hall input, DC level should be set at 1.5 to 4.0V and the amplitude of each phase (Hn+-Hn-) should be set at 60mVP-P or more.
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s Phase Conditions of Hall Input and Output Current
H1
H3
H2
H1
H2
H3 Q
ECR EC Q
RDS Q
Pulled out
A3
A2
A1
A2
A3
A1
Output current
Q
Sunk into
A
B
C
D
E
F
Phase of Hall Element H1+ A B C D E F H H M L L M H2+ M L L M H H H3+ L M H H M L
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Request for your special attention and precautions in using the technical information and semiconductors described in this book
(1) If any of the products or technical information described in this book is to be exported or provided to non-residents, the laws and regulations of the exporting country, especially, those with regard to security export control, must be observed. (2) The technical information described in this book is intended only to show the main characteristics and application circuit examples of the products, and no license is granted under any intellectual property right or other right owned by our company or any other company. Therefore, no responsibility is assumed by our company as to the infringement upon any such right owned by any other company which may arise as a result of the use of technical information described in this book. (3) The products described in this book are intended to be used for standard applications or general electronic equipment (such as office equipment, communications equipment, measuring instruments and household appliances). Consult our sales staff in advance for information on the following applications: - Special applications (such as for airplanes, aerospace, automobiles, traffic control equipment, combustion equipment, life support systems and safety devices) in which exceptional quality and reliability are required, or if the failure or malfunction of the products may directly jeopardize life or harm the human body. - Any applications other than the standard applications intended. (4) The products and product specifications described in this book are subject to change without notice for modification and/or improvement. At the final stage of your design, purchasing, or use of the products, therefore, ask for the most up-to-date Product Standards in advance to make sure that the latest specifications satisfy your requirements. (5) When designing your equipment, comply with the range of absolute maximum rating and the guaranteed operating conditions (operating power supply voltage and operating environment etc.). Especially, please be careful not to exceed the range of absolute maximum rating on the transient state, such as power-on, power-off and mode-switching. Otherwise, we will not be liable for any defect which may arise later in your equipment. Even when the products are used within the guaranteed values, take into the consideration of incidence of break down and failure mode, possible to occur to semiconductor products. Measures on the systems such as redundant design, arresting the spread of fire or preventing glitch are recommended in order to prevent physical injury, fire, social damages, for example, by using the products. (6) Comply with the instructions for use in order to prevent breakdown and characteristics change due to external factors (ESD, EOS, thermal stress and mechanical stress) at the time of handling, mounting or at customer's process. When using products for which damp-proof packing is required, satisfy the conditions, such as shelf life and the elapsed time since first opening the packages. (7) This book may be not reprinted or reproduced whether wholly or partially, without the prior written permission of Matsushita Electric Industrial Co., Ltd.

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