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KA2822D
3-Phase BLDC Motor Driver
Features
* 3-phase, full-wave, linear BLDC motor driver with 2 hall sensors * Built-in soft switching drive circuit * 300 or 360 RPM speed control * Snubberless * Built-in chip enable function * Built-in digital speed control circuit * Built-in current limit circuit * Index sensorless * Built-in TSD (Thermal shutdown) * Low saturation voltage * Digital input: TTL, 5V CMOS compatible * Built-in current-mode control circuit (IPEAK: 1A)
Description
The KA2822D is a monolithic integrated circuit, and suitable for the three-phase spindle motor driver of FDD system.
28-SSOPH-375
Typical Application
* 3.5-inch floppy disk drive (FDD) spildle motor * Other 3-phase BLDC motor
Ordering Information
Device KA2822D KA2822BD Package 28-SSOPH-375 28-SSOPH-375 Operating Temp. 0 ~ 75C 0 ~ 75C 0 ~ 75C 0 ~ 75C
KA2822DTF 28-SSOPH-375 KA2822BDTF 28-SSOPH-375
Rev. 1.0.2 May. 2000.
(c)2000 Fairchild Semiconductor International
1
KA2822D
Pin Assignments
FG INPUT(-) AGC INDEX PULSE WIDTH VOLTAGE REG INDEX BURST INDEX OUTPUT CE
1 2 3 4 5 6 7
28 27 26 25 24 23 22
FG INPUT(+) HALL BIAS CURRENT DETECTION1 V INPUT(-) V INPUT(+) U PHASE OUTPUT V PHASE OUTPUT
FIN
KA2822D
FIN
SIGNAL GROUND FG ZERO CROSS FG OUTPUT RPM SELECT CHARGE PUMP OUTPUT OSC INPUT NC
8 9 10 11 12 13 14
21 20 19 18 17 16 15
W PHASE OUTPUT NC U INPUT(+) U INPUT(-) CURRENT DETECTION2 VCC PHASE COMPENSATION
2
KA2822D
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 FIN Pin Name FG_INPUT AGC INDEX PULSE WIDTH VOLTAGE REGULATOR INDEX BURST INDEX OUTPUT CE 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 V PHASE OUTPUT U PHASE OUTPUT U INPUT (+) V INPUT (-) CURRENT DETECTION1 HALL BIAS FG INPUT (+) POWER GROUND 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 (1.1V) pin Voltage (2.2V) generator output pin Index pulse width detection (1.4V) pin Index pulse output pin Chip enable (Active low) 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 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 Power ground
3
KA2822D
Internal Block Diagram
CURRENT CURRENT DETECTION2 DETECTION1 17 26
VCC 16
U INPUT (+) 19 U INPUT(-) 18 V INPUT (+) 24 V INPUT(-) 25
+ U_AMP - + V_AMP -
U_OUT
23
U PHASE OUTPUT
Output Control
V_OUT
22
U PHASE OUTPUT
AGC
2
AGC W_OUT 21 W PHASE OUTPUT
HALL BIAS 27
Start-up
Hall Zero-cross TSD
CE
7
CE CON_AMP 1.3V - + 0.24V 15 FG Zero-cross - 0.69V BUF_AMP + PHASE COMPENSATION
FG INPUT(+) 28 FG INPUT(-) 1
FG_AMP + -
FG OUTPUT 10
FG ZERO CROSS
9 Timing Detectpr Burst_time Circuit Pulse_width Adjustment 6 INDEX OUTPUT INDEX PULSE WIDTH CHARGE PUMP OUTPUT
VOLTAGE REG. INDEX BURST
4 2.2V 5 OSC Rpm_select 11_divider Speed Control Charge Pump
3
12
OSC INPUT 13
14 NC
11 RPM SELECT
8 SIGNAL GROUND FIN
20 NC
4
KA2822D
Equivalent Circuits
U_amp, V_ amp input U, V, W drive output and current detection 1, 2
vcc
(17Pin, 26Pin)
vcc
vcc
5k 2.5k 2.5k (18Pin, 24Pin)
40k U (23Pin) V (22Pin)
VCC (16Pin)
(19Pin, 25Pin)
W (21Pin)
40k
40k
FG input and FG output
OSC input
vcc vcc
0.5k 0.5k (28Pin) 0.1k 1k 50pF 5k
vcc vcc vcc
(13Pin)
vcc
25k
vcc
(10Pin)
CE input
Hall bias input and voltage regulator output
vcc vcc vcc
CE 3k
vcc
2.9V
vcc
(27Pin)
vcc
(4Pin)
2.2V
5
KA2822D
Equivalent Circuits (Continued)
Index pulse width detection output Phase compensation and current detection 1, 2
vcc
vcc vcc
(15Pin) (3Pin)
vcc
vcc vcc
vcc vcc
2k
(17Pin, 26Pin)
2k
RPM select input
AGC input
vcc vcc vcc
AGC (2Pin) 6k (11Pin)
vcc
vcc
To U amp, V amp (Current control)
Index output
Index burst output
vcc
(6Pin)
vcc vcc
2k 1.4V (5Pin)
vcc
6
KA2822D
Equivalent Circuits (Continued)
FG zero cross output
vcc
vcc
vcc
(9Pin)
Charge pump output
vcc vcc vcc
to IIL Circuit
(12Pin)
vcc
Charge pump
Buffer amp
7
KA2822D
Absolute Maximum Rating (Ta=25C)
Parameter Maximum power supply voltage Maximum input voltage Maximum output current Normal output current Power dissipation Operating temperature Junction temperture Storage temperature Symbol VCCMAX VINMAX IOMAX IO PD TA TJ TSTG Value 7.0 0 ~ VCC 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
Power Dissipation : PD[W]
1.0
0.5 0
0
25
50
75
100
125
150
175
Ambient temperature, Ta [C]
Power dissipation decreases in the rate of 13.5mV / C when mounted on 50mm x 50mm x 1mm PCB (Phenolic resin material) and used above Ta=25C.
Recommended Operating Conditions (Ta=25C)
Parameter Supply voltage Supply voltage in logic part Ambient operating temperature range Symbol VCC1, VCC2 VCC3 Ta Min. 10.8 4.5 0 Typ. 12.0 5.0 Max 13.2 5.5 +70 Unit V V C
Temperature Characteristic
Parameter Thermal shutdown temperature
NOTE: Reference value
note
Symbol TSD
Min. 125
Typ. 150
Max -
Unit C
8
KA2822D
Electrical Characteristics
(Ta=25C, VCC=5V) Parameter SUPPLY CURRENT Supply current 1 Supply current 2 CHIP ENABLE Input current Input low voltage Input high voltage RPM SELECT Input current Input low voltage Input high voltage HALL AMP Input resistance note Common mode input voltage range Differential input voltage range START-UP Hall bias voltage 1 Hall bias voltage 2 Reference voltage Bias off current OUTPUT AMP Leakage current Saturation voltage 1 Saturation voltage 2 BUFFER & CONTROL AMP Voltage gain 1 note Reference voltage 1
note note note
Symbol ICCO ICC ICE ICE1 ICEH1 IRPM VRPM1 VRPMH RIN VCOM VDIF VHB1 VHB2 Vref IHOFF ICER Vsat1 Vsat2 GCT1 Vref1 Vref2
Conditions VCC=6.5V CE=H, RPM=L VCC=6.5V, CE=L CE=0~5V CE=0~5V IH=4mA, CE=L IH=10mA, CE=L IO=1mA, CE=L VH=7V, CE=H IO=0.35A IO=0.7A Current limiter voltage Control begin voltage
Min. 3.5 3.5 1 2.0 100 2.3 2.7 1.7 -
Typ. 1.0 15 5 5 10 2.5 2.9 2.2 5 0.5 1.0 1.3 -11 0.69
Max. 2.0 23 10 1.0 10 1.0 VCC 420 2.7 3.1 2.7 10 1 1.2 1.8 -
Units mA mA A V V A V V k V mVPP V V V A mA V V dB V V
0.205 0.208 0.210
Reference voltage 2 note
Notes: Reference value
9
KA2822D
Electrical Characteristics (Continued)
(Ta=25C, VCC=5V) Parameter CHARGE PUMP Charge current Discharge current Current ratio note Off current Clamp voltage FG AMP Output DC voltage note Voltage gain 2 Input voltage range note Noise margin 1 Noise margin 2
note note note
Symbol ICP- ICP+ IR IOFF VCLP VFG GFG VIN ND NC N1 N2 FD IBI VTH1 VTH2 ICT2 VTH3 IOH VO1
Conditions RPM=L RPM=L ICP+ / ICP- VCP=0.63V Differential noise Common mode noise RPM=L RPM=H RPM=L RPM=H IO=1mA
Min. -15 15 0.9 1.0 24 2.0 1.2 1.05 -19 0.9 -
Typ. -20 20 1.0 1.3 1.3 34 1666.5 1388.5 1.0 1 1.45 1.3 -25 1.1 1 0.2
Max. -25 25 1.1 50 1.5 1.6 44 20 0.5 0.5 1.1 2 1.7 1.55 -36 1.3 2 0.4
Units A A nA V V dB mVP-P mVP-P VP-P MHz A V V A V A V
SPEED CONTROL Count range 1note Count range 2
note
Operating freq. BURST ADJUSTMENT Input current Threshold voltage 1 Threshold voltage 2 PULSE WIDTH ADJUSMENT Ct2 charge current Threshold voltage 3 INDEX OUTPUT Output leakage current note Output low voltage
Notes: Reference value
10
KA2822D
Application Information
1. CHIP ENABLE This function turns on or off all blocks by low or high signal. 2. U, V AND W PHASE OUTPUT AMP These ampilifiers drives three output phases - U, V, and W which have 120(degree) phase differences with each other. The three phase waveforms are made with the two hall sensor signals by synthesizing the third phase signal. 3. SPEED CONTROL PART This function compares the real motor rotation frequency with the 300 or 360Hz pulse divided from 1MHz clock pulse for removing speed error when motor is on and speed error is detected by PLL. The speed error sent to charge pump part which repeats charge and discharge controls the output current of the output amp to keep a stable rotation.
11
KA2822D
Typical Performance Characteristics
ICC
15.0 [mA]
1.5 /div.
0 0 0.8/div. 8.0[V]
VCC 1. VCC vs. ICC
Vref
3.0 [V]
Index pulse width
8.0 [ms]
0.3 /div.
1.0 /div.
0 0.8/div. 8.0[V]
0
4.2
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0[V]
VCC VCC vs. Vref (Pin4)
VCC VCC vs. Index pulse width
12
KA2822D
Typical Application Circuits
+5V
220nF 1 SW1 DISK_IN W_P CURRENT DETECTION2 CURRENT DETECTION1 1
H_D SW2
100
100nF
VCC
HU LED
U INPUT(+) U INPUT(-)
U PHASE OUTPUT 23 V PHASE OUTPUT 22 21 15 1.8M
U V
19 18
16
17 26
U INPUT(+) HV U INPUT(-)
24 25
W PHASE OUTPUT W PHASE COMPENSATION +5V
HALL BIAS 27 AGC 2 CE CE FG_INPUT(+) 47nF 47nF FG_INPUT(-) FG ZERO CROSS 9 7 28 1
10k
KA2822D
6 3 12
INDEX OUTPUT OSC INPUT 100nF
CHARGE PUMP OUTPUT
10nF 56k VR 4 VOLTAGE REGULATOR INDEX BURST 47nF 5 13 11 SIGNAL GROUND OSC INPUT RPM SELECT 8
100nF
330k
47k 1MHz RPM_SEL INDEX
13
KA2822D
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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