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KA2822CD
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 KA2822CD 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.
28-SSOPH-375
1
Typical Application
* 3.5-inch floppy disk drive(FDD) spindle motor driver
Ordering Information
Device KA2822CD Package 28-SSOPH-375 Operating Temp. 0 ~ 75C 0 ~ 75C
KA2822CDTF 28-SSOPH-375
Rev. 1.0.0
(c)2003 Fairchild Semiconductor Corporation
KA2822CD
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
KA2822CD
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 V 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
KA2822CD
Internal Block Diagram
CURRENT CURRENT DETECTION2 DETECTION1 17 26
VCC 16
U INPUT (+) 19 U INPUT(-) 18 V INPUT (+) 24 V INPUT(-) 25 AGC 2
+ U_AMP - + V_AMP -
U_OUT
23
U PHASE OUTPUT
Output Control
V_OUT
22
V PHASE OUTPUT
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 Detector VOLTAGE REG. INDEX BURST 4 2.2V 5 OSC Rpm_select 11_divider Speed Control Burst_time Circuit
Pulse_width Adjustment
6
INDEX OUTPUT INDEX PULSE WIDTH CHARGE PUMP OUTPUT
3 Charge Pump
12
OSC INPUT 13
14 NC
11 RPM SELECT
8 SIGNAL GROUND FIN
20 NC
4
KA2822CD
Equivalent Circuits
U_amp, V_ amp input U, V, W drive output and current detection 1, 2
vcc vcc
5k
(17Pin, 26Pin)
vcc
2.5k 2.5k (18Pin, 25Pin)
VCC (16Pin)
(19Pin, 24Pin)
U (23Pin)
V (22Pin)
W (21Pin)
40k
40k
40k
FG input and FG output
OSC input
vcc vcc
0.5k (1Pin) 0.5k (28Pin)
vcc vcc
0.1k (13Pin) 50pF 5k 1k
vcc
vcc
25k
vcc
(10Pin)
CE input
Hall bias input and voltage regulator output
vcc vcc vcc
CE (7Pin) (27Pin)
vcc
2.9V
vcc vcc
(4Pin)
3k
2.2V
5
KA2822CD
Equivalent Circuits
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
vcc
1.4V (5Pin)
6
KA2822CD
Equivalent Circuits
FG zero cross output
vcc
vcc
vcc
(9Pin)
Charge pump output
vcc vcc vcc
to IIL Circuit
(12Pin)
vcc
Charge pump
Buffer amp
7
KA2822CD
Absolute Maximum Rating (Ta=25C)
Parameter Maximum power supply voltage Maximum input voltage Maximum output current Normal output current Power dissipation Operating temperature Junction temperature 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 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 12.0mV / 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 Ambient operating temperature range Symbol VCC Ta Min. 4.5 0 Typ. 5.0 Max 5.5 70 Unit V C
Temperature Characteristic
Parameter Thermal shutdown temperature
NOTE: Design reference value
note
Symbol TSD
Min. 125
Typ. 150
Max -
Unit C
8
KA2822CD
Electrical Characteristics
(Ta=25C, VCC=5V, unless otherwise specified) 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 Reference voltage 2
Notes: Design reference value
note note note note
Symbol
Conditions VCC=5.5V CE=H, RPM=L VCC=5.5V, CE=L CE=0~5V CE=0~5V IH=4mA, CE=L IH=10mA, CE=L IO=1mA, CE=L VH=5.5V, CE=H IO=0.35A IO=0.7A Current limiter voltage Control begin voltage
Min.
Typ.
Max.
Unit
ICCO ICC ICE VCEL VCEH IRPM VRPML VRPMH RIN VCOM VDIF VHB1 VHB2 Vref IHOFF ICER Vsat1 Vsat2 GCT1 Vref1 Vref2
3.5 3.5 1 2.0 140 2.3 2.7 1.7 -
1.0 15 5 5 10 2.5 2.9 2.2 5 0.5 1.0 1.3 -11 0.69
2.0 23 10 1.0 10 1.0 VCC 420 2.7 3.1 2.7 10 1 1.2 1.8 -
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
9
KA2822CD
Electrical Characteristics (Continued)
(Ta=25C, VCC=5V, unless otherwise specified) Parameter CHARGE PUMP Charge current Discharge current Current ratio Off current Clamp voltage FG AMP Output DC voltage note Voltage gain 2 Input voltage range Noise margin 1 Noise margin 2
note note 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
Unit 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: Design reference value
10
KA2822CD
Application Information
1. Chip Enable
This function turns on or off all blocks by low or high signal (active low).
2. U, V And W Phase Output Amp
These ampilifiers drive 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 the motor is 'on' and speed error is detected by PLL. The speed error is sent to the charge pump, which repeats charging and discharging by the error. The charge pump output controls the output current to keep a stable rotational speed.
4. Sensorless Index Signal Generation
KA2822CD can make index signals without an index hall sensor by special rotor magnetization.
11
KA2822CD
Typical Application Circuits
+5V
220nF 1 1
SW1 DISK_IN W_P CURRENT DETECTION2
H_D SW2
100
CURRENT DETECTION1
100nF
VCC
LED
HU
U INPUT(+) U INPUT(-)
U PHASE OUTPUT 23 22 21 15 1.8M V PHASE OUTPUT
U V
19 18 24 25 27 2
16
17 26
HV
V INPUT(+) V INPUT(-) HALL BIAS AGC
W PHASE OUTPUT W PHASE COMPENSATION +5V
10k
CE 47nF 47nF
CE FG_INPUT(+) FG_INPUT(-) FG ZERO CROSS
7 28 1 9 4
KA2822D
6 3 12
INDEX OUTPUT OSC INPUT 100nF
CHARGE PUMP OUTPUT
10nF
100nF
56k VR
VOLTAGE REGULATOR INDEX BURST 47nF 5 13 11 OSC INPUT SIGNAL GROUND RPM SELECT 8 330k
47k 1MHz RPM_SEL INDEX
12
KA2822CD
13
KA2822CD
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 CORPORATION. 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 4/18/03 0.0m 001 Stock#DSxxxxxxxx 2003 Fairchild Semiconductor Corporation
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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