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KA3011BD
3-Phase BLDC Motor Driver
Features
* 3-phase, full-wave, linear BLDC motor driver * Power save at stop mode * Built-in current limiter * Built-in TSD (Thermal shutdown) circuit * Built-in 3X or 1X hall FG output * Built-in hall bias circuit * Built-in rotational direction detector * Built-in reverse rotation preventer * Built-in short braker * Corresponds to 3.3V or 5V DSP
Description
The KA3011BD is a monolithic IC, suitable for a 3-phase spindle motor driver of a CD-media system.
28-SSOPH-375
Typical Applications
* Compact disk ROM (CD-ROM) spindle motor * Compact disk RW (CD-RW) spindle motor * Digital video disk ROM (DVD-ROM) spindle motor * Digital video disk RAM (DVD-RAM) spindle motor * Digital video disk Player (DVDP) spindle motor * Other compact disk media spindle motor * Other 3-phase BLDC motor
Ordering Information
Device KA3011BD Package 28-SSOPH-375 Operating Temp. -25C ~ +75C -25C ~ +75C
KA3011BDTF 28-SSOPH-375
Rev. 1.0.1 February. 2000.
(c)2000 Fairchild Semiconductor International
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KA3011BD
Pin Assignments
VCC ECR CS1 FGS VM NC FG EC NC 16 13 H3+ VH 15 14 H3- SB 18 11 H2+ FIN(GND) PC1 17 12 H2- S/S DIR 20 9 H1+
28
27
26
25
24
23
22
21
19
KA3011BD
1 NC
2 A3
3 NC
4 A2
5 NC
6 NC
7 A1 FIN(GND)
8 GND
10 H1-
Pin Definitions
Pine 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 Pin Name NC A3 NC A2 NC NC A1 GND H1+ H1- H2+ H2- H3+ H3- VH NC PC1 SB FGS DIR ECR EC S/S FG VCC NC VM CS1 I/O O O O I I I I I I I I I O I I I O No connection Output (A3) No connection Output (A2) No connection No connection Output (A1) Ground Hall signal (H1+) Hall signal (H1-) Hall signal (H2+) Hall signal (H2-) Hall signal (H3+) Hall signal (H3-) Hall bias No connection Phase compensation capacitor Short brake Frequency generation selection Rotational direction output Output current control reference Output current control voltage Power save (Start/Stop switch) Frequency generation waveform (3X or 1X hall frequency) Supply voltage (Signal) No connection Supply voltage (Motor) Output current detection 2 Pin Function Description
KA3011BD
28
1 27 2 3 4 5 6 7 Current sense Amp FG Generator Start Stop - 26 25 24 23 22
NC
CS1
A3
VM
NC
NC
Internal Block Diagram
VCC
A2
NC
FG
NC
S/S
A1
EC
GND 8
GND
GND
3
Lower Distributor 9 H1+ 10 H1- 11 H2+ 12 H2- 13 H3+ 14 H3- Hall amp
+
Output Current limit
Reverse rotation 20 DIR Commutation Selector Detector 18 Detection Short Brake SB Logic 19 FG Selector FGS
Absolute Values
Upper Distributor
21 17 16
ECR
PC1
NC TSD Hall
15
VH
KA3011BD
Equivalent Circuits
Hall input Driver output
27 9 50 11 13 1k 1k 50 12 14 10
28
2
4
7
Torque control input
Hall bias input
50 21 50 22 -
+
5 15
50k
Current detector
Start / Stop
50 23
50k 18 30k
50
50k
30k
Dir or FG output
FGS input
VCC
20k 50 20 24 19 30k 50 50k
4
KA3011BD
Absolute Maximum Rating (Ta=25C)
Parameter Maximum supply voltage (Signal) Maximum supply voltage (Motor) Power dissipation Maximum output current Operating temperature range Storage temperature range Symbol VCCmax VMmax PD IOmax TOPR TSTG Value 7 18 1.7 note 1.3 -25 ~ +75 -55 ~ +150 Unit V V W A C C
NOTE: 1. When mounted on 76.2mm x 114mm x 1.57mm PCB (Phenolic resin material) 2. Power dissipation is reduced 13.6 mW / C for using above Ta=25C 3. Do not exceed PD and SOA (Safe operating area).
Power Dissipation Curve
Pd (mW) 3,000 2,000
1,000 0
SOA 0 25 50 75 100 125 150 175
Ambient temperature, Ta [C]
Recommended Operating Conditions (Ta=25C)
Parameter Supply voltage Motor supply voltage Symbol VCC VM Min. 4.5 3.0 Typ. 5 12 Max 5.5 15 Units V V
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KA3011BD
Electrical Characteristics
(Unless otherwise specified, Ta=25C, VCC=5V, VM=12V) Parameter Quiescent circuit current START / STOP On voltage range Off voltage range HALL BIAS Hall bias voltage HALL AMP Hall bias current Common mode input range Minimum input level TORQUE CONTROL ECR input voltage range EC input voltage range Offset voltage (-) Offset voltage (+) EC input current ECR input current In/output gain FG FG output voltage (H) FG output voltage (L) Input voltage range OUTPUT BLOCK Saturation voltage (upper TR) Saturation voltage (lower TR) Torque limit current DIRECTION DETECTOR Dir output voltage (H) Dir output voltage (L) FG SELECTION 3X frequency selection 1X frequency selection SHORT BRAKE On voltage range Off voltage range VSBon VSBoff 2.5 0 VCC 1.0 V V VFG3X VFG1X FGS > 2.5V FGS < 1.0V 2.5 VCC 1.0 V V VDIRh VDIRl IFG=-10A IFG=10A 3.0 VCC 0.5 V V VOh VOl ITL IO= -300mA IO=300mA RCS=0.5 560 0.9 0.2 700 1.6 0.6 840 V V mA VFGh VFGl IFG= -10A IFG=10A - 3.0 50 VCC 0.5 V V % ECR EC ECoff- ECoff+ ECin ECRin GEC EC=2.5V EC=2.5V EC=2.5V ECR=2.5V ECR=2.5V, RCS=0.5 - - 0.2 0.2 -80 20 -5 -5 0.41 -50 50 0.5 0.5 0.51 4.0 4.0 -20 80 5 5 0.61 V V mV mV A A A/V IHA VHAR VINH - - - 1.5 100 0.5 2 4.0 A V mVpp VHB IHB=20mA 0.4 1.0 1.8 V VSSon VSSoff Output drive on Output driver off 2.5 0.0 VCC 1.0 V V Symbol ICC Condition - Min. 2 Typ. 5 Max. 8 Units mA
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KA3011BD
Electrical Characteristics (Continued)
Calculation of Gain & Torque Limit Current
VM IO VM
Current / Voltage Convertor - Vin EC ECR + - Gm Absolute Values + + + + Vmax - VM R1 -
- VS Output RS Current sense + CS1 (Pin 28)
Negative Feedback loop U V W IO
Driver
Power Transistors
Commutation Distributor H1 H2
H3
Max. output current limiting
0.255 from GM times R1 is a fixed value within IC.
0.255 Gain = -------------RS
Vmax (see above block diagram) is setted to 350mV.
Vmax 350 [ mV ] Itl [ mA ] = --------------- = ----------------------RS RS
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KA3011BD
Application Information
1. TORQUE & OUTPUT CURRENT CONTROL
VM + VM VCS - Current Sense AMP - TSD EC Gain Controller RCS
Torque AMP ECR + - + ECR-EC
IO Driver M
* By amplifying the voltage difference between EC and Ecr from servo IC, the torque sense amp produces the input (VAMP) for the current sense amp. * The output current (IO) is converted into the voltage (VCS) through the sense resistor (RCS) and compared with the VAMP. By the negative feedback loop, the sensed output voltage, VCS is equal to the input VAMP. Therefore, the output current (IO) is linearly controlled by the input VAMP. * As a result, the signals, EC and ECR can control the velocity of the Motor by controlling the output current (IO) of the Driver. * The range of the torque voltage is as shown below.
VRNF [V] Reverse Forward
Rotation
Ecoff- Ecoff+
ECR > EC ECR < EC
0.51[A/V]
Forward rotation Stop after detecting reverse rotation
3 mV -50mV 0 50mV ECR -EC
The input range of ECR, EC is 0.2V ~ 4V. 2. SHORT BRAKE
MOTOR VCC OFF
ON OFF
18
2 50k ON 30k 4 7
Pin # 18
Short brake
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KA3011BD
High
On
Low Off When the pick-up mechanism moves from the inner to the outer spindle of the CD, the brake function of the reverse voltage is commonly employed to decrease the rotating velocity of the spindle motor. However, if the spindle motor rotates rapidly, the brake function of the reverse voltage may produce more heat at the Drive IC. To remove this shortcoming and to enhance the braking efficiency, the short brake function is added to KA3011BD. When the short brake function is active, all upper power TRs turn off and all lower power TRs turn on, and the Motor slows down. But FG and DIR functions continue to operate normally. 3. POWER SAVE
MOTOR VCC OFF
23 Start Stop
2 50k OFF 30k 4 7
Pin # 23 High Low
Start/Stop Operate Stop
When power save function is active, all power TRs turn off but FG and DIR functions continue to operate normally. 4. TSD (THERMAL SHUTDOWN)
Gain Controller BIAS Q2
When the chip temperature rises above 175C, the Q2 turns on and the output driver shuts down. When the chip temperature falls off to about 150C, then the Q2 turns off and the driver operates normally. TSD has the temperature hysteresis of about 25C.
9
KA3011BD
5. ROTATIONAL DIRECTION DETECTION
VCC
H2+ H2-
+ -
DIR 20 D Q
Rotation Forward Reverse
20
DIR Low High
CK H3+ H3- + - D-F/F
* The forward and the reverse rotations of the CD are detected by the D-F/F and the truth table is shown above. * The rotational direction of the CD can be explained by the output waveform of the hall sensors. The three outputs of hall sensors be H1, H2 and H3 respectively. When the spindle rotates in reverse direction, the hall sensor output waveforms are shown in Fig.(a). The phases order are in H1H2H3 with a 120C phase difference.
H1
H2
H3
( a) Reverse rotation
On the other hand, if the spindle rotates in forward rotation, the phase relationship is H3H2H1 as shown in Fig.(b).
H1
H2
H3
( b) Forward rotation
The output of the rotational direction detector is low, when the spindle rotates forward, and high in the reverse rotation.
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KA3011BD
6. REVERSE ROTATION PREVENTION
EC ECR
+ -
Current Sense Amp
H2+ H2-
+ - A D CK D-F/F Q
Low Active
H3+ H3-
+ -
Gain Controller
Driver
M
* When the output of the OR Gate, A is LOW, it steers all the output current of the current sense Amp to the Gain Controller zero. The output current of the Driver becomes zero and the motor stops. * As in the state of the forward rotation, the D-F/F output, Q is HIGH and the motor rotates normally. At this state, if the control input is changed such that EC>ECR, then the motor rotates slowly by the reverse commutation in the Driver. When the motor rotates in reverse direction, the D-F/F output becomes Low and the OR Gate output, becomes LOW. This prevents the motor from rotating in reverse direction. The operation principle is shown in the table and the flow chart. Rotation Forward Reverse H2 H L H3 HL HL D-F/F (Q) H L Reverse rotation preventer ECECR Brake and stop
Forward rotation at EC < ECR Rotating speed is decreased due to reverse torque at EC >ECR. (Motor still rotates forward) At the moment that the motor rotates in reverse, the reverse rotation preventer makes the output power transistor open. Rotating reverse at short time due to motor inertia Stop within 1/6 turn reverse rotating
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KA3011BD
7. FG OUTPUT
H1- H1+ FG1X
H2- FG3X H2+
Mux
FG
H3- FGS H3+
FGS GND or Open VCC
FG FG1X (1X hall frequency) FG3X (3X hall frequency)
8. HALL SENSOR CONNECTION
VCC
VCC
HALL 1 HALL 1 HALL 2 HALL 3
HALL 2
HALL 3
15 VH
15 VH
9. Connect a by-pass capacitor, 0.1mF between the supply voltage source.
Vcc
25 0.1F
10. The heat radiation fin is connected to the internal GND of the package. Connect that fin to the external GND.
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KA3011BD
11. INPUT-OUTPUT TIMING CHART
H1 +
H2 +
H3 +
A1 output current (H1 -)+(H2 +)
A1 output voltage
A2 output current (H2 -)+(H3 +)
A2 output voltage
A3 output current (H3 -)+(H1 +)
A3 output voltage
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KA3011BD
Test Circuits
10A 20mA
14 5V 12V VR1 IM3 A IM2 A 10uA 15 VM7 V RCS 0.5 VM6 VR2 VR3
V VM5
13
V VM3
VR5
IM1 A
IM2 A V VM4 VR4 0.1F 19 FGS 18 SB 17 PC1 16 NC 15 VH
28 CS1
27 VM
26 NC
25 VCC
24 FG
23 SS
22 EC
21 ECR
20 DIR
KA3011BD
NC 1
A3 2
NC 3
A2 4
NC 5
NC 6
A1 7
GND 8
H1+ 9 IM4
H1- 10 IM5 A
H2+ 11 IM6 A
H2- 12 IM7 A
H3+ 13 IM8 A
H3- 14 IM9 A
SW1 VM8 V c b a c b
SW2 a V c b
SW3 a V
A VR8 VR9
VR10 VR11 VR12 VR13
RL=5
RL=5
RL=5
SW13 a b
V
VM1
V VM2
12V 300mA 300mA
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KA3011BD
Typical Application Circuits
0.5 1 NC CS1 28 27 26 VM (12V)
2 3 4 5 6 7
A3 NC
VM NC
A2 NC NC
VCC FG SS
25 VCC (5V) 24 ST 23 SP 22 1.675V OR 2.1V
A1
EC
KA3011BD
8 9 HALL 1 10
GND
ECR
21
H1+ H1-
DIR FGS
20 19
Servo Signal
11 HALL 2 12 13 HALL 3 14
H2+ H2-
SB PC1
18 R2 17 16 0.1F
H3+ H3-
NC VH
15 R1
15
KA3011BD
DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR INTERNATIONAL. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user.
www.fairchildsemi.com 12/1/00 0.0m 001 Stock#DSxxxxxxxx 2000 Fairchild Semiconductor International
2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.

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