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KA3084D
2-Phase BLDC Motor Driver
Features
* Drives the BLDC motor using 2 hall sensors. * 2-phase, full-wave drive method * Built-in thermal shutdown (TSD) circuit * Controls the motor speed through voltage * Built-in bandgap circuit * Built-in frequency Generator (FG) & Phase Generator (PG) amplifier & comparator.
Description
The KA3084D is a monolithic integrated circuit, and it is suitable for drum motor driver of VCR system.
22-SOP-300
Target Applications
* Video cassette recorder(VCR) cylinder (drum) motor * Other 2-phase BLDC motor
Ordering Information
Device KA3084D Package 22-SOP-300 Operating Temp. -25C ~ +75C -25C ~ +75C
KA3084DTF 22-SOP-300
Rev. 1.0.1 February. 2000.
(c)2000 Fairchild Semiconductor International
1
KA3084D
Pin Assignments
FGAMPOUT PGAMPOUT
FGOUT
PGOUT
VERG
PGIN
FGIN
VCTL
H2N
22
21
20
V25
19
18
17
16
15
14
13
12
KA3084D
1 GND(Signal)
2 VCC2
3 OUT2P
4 GND2(Power)
5 OUT2N
6 OUT1P
7 GND1(Power)
8 OUT1N
9 VCC1
10 H1P
11 H1N
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 Pin Name GND (Signal) VCC2 OUT2P GND2 (Power) OUT2N OUT1P GND1 (Power) OUT1N VCC1 H1P H1N H2P H2N VCTL PGOUT PGAMPOUT PGIN VREG FGIN V25 FGAMPOUT FGOUT I/O O O O O I I I I I O O I O I I/O O O Pin Function Description Ground (Signal) Power supply 2 Output drive 2(P) Power ground 2 Output drive 2(N) Power supply 1(P) Power ground 1 Output drive 1(N) Power supply 1 Hall signal input 1P Hall signal input 1N Hall signal input 2P Hall signal input 2N Voltage control (Motor speed control) Phase generator output Phase generator amp. output Phase generator input Regurated voltage Frequency generator input Reference voltage Frequency generator amp. output Frequency generator output
2
H2P
KA3084D
1 21 2 3 4 5
DRIVER TSD V25
+- AMP
22
GND(Signal)
HYS. COM
FGOUT
VCC2
FGAMPOUT
20
Internal Block Diagram
OUT2P
V25
GND2(Signal)
FGIN
19
Supply each block
18
OUT2N
VREG (5.0V)
VREG
3
6 7 8 9 10
17
-+ AMP
OUT1P
PGIN
16
GND1(Power)
DRIVER
PGAMPOUT
15
OUT1N
HYS. COM ICTL
PGOUT
14
VCC1
Current/Voltage Control VCTL GM GM
VCTL
13
H1P
H2N
+ +-
AMP
AMP
-
11
12
H1N
H2P
KA3084D
Equivalent Circuits
Description VCTL Pin No. 14
VREG
Internal circuit
ICTL 50 14 1k
Motor output
3, 5, 6, 8
VCC
3 6
5 8
Hall input
10, 11, 12, 13
VREG Vcc
50 10 12
500
500
50 11 13
ICTL
4
KA3084D
Equivalent Circuits (Continued)
Description PG, FG amplifier Pin No. 16, 17 19, 21
VREG
Internal circuit
VCC
VCC
50 17 19
1k V25
50 16 21
PG, FG hysteresis amplifier
3, 5, 6, 8
VCC VREG VREG VCC 10K 50 15 50 16 V25 21 22
5
KA3084D
Absolute Maximum Ratings (Ta=25C)
Parameter Supply voltage Maxium output current VREG output current Power dissipation Operating temperature Storage temperature Symbol VCCmax IOmax IREGmax Pd TOPR TSTG Value 18 1.0
note1
Unit V A mA W C C
Remark No heat sink -
30 1 note2 -25 ~ +75 -45 ~ +125
Notes: 1. Duty 1 / 100, pulse width 500s 2. 1) When mounted on glass epoxy PCB (76.2 x 114 x 1.57mm) 2) Power dissipation reduces 8.0mW / C for using above Ta=25C. (Without heat-sink) 3) Do not exceed Pd and SOA(Safe Operating Area).
Power Dissipation Curve
Pd (mW) 2, 000
SOA 0 0 25 50 75 100 125 150 175
Ambient temperature, Ta [C]
Recommended Operating Conditions (Ta = 25oC)
Parameter Operating supply voltage Symbol VCC Min. 8 Typ. 12 Max 16 Units V
6
KA3084D
Electrical Characteristics
(Ta=25C, VCC=12V, unless otherwise specified) Parameter FULL CIRCUIT Quiescent current VOLTAGE REGULATOR Regulated voltage Regulated voltage HALL INPUT Hall minimum input level note Hall bias current OUTPUT DIRVE Output saturation voltage (Upper) Output saturation voltage (Lower) Output current A Output current B VOLTAGE CONTROL VCTL reference voltage note VCTL input range
note
Symbol IQ VREG VREG VINH IBH VSU VSL IOUTA IOUTB
Condition VCC=12V VCC=12V VCC=12V, IREG=-20mA VCTL=2.0V, Hall=2.5V VCTL=4.5V VCTL=4.5V VH1P=2.6V VH1N=2.4V, VCTL=3.5V VH2P=2.6V VH2N=2.4V, VCTL=2.5V 0.48 x VREG VCTL=0 ~ VCTL VCTL=2.5V VCTL=2.8V, 3.3V IO / VCTL VH1P=2.6V, VH1N=2.4V
IO
Min. 4.6 4.6 50 500 500
Typ. 8.5 5.0 5.0 0.25 1.3 2.0 700 700
Max. 13 5.4 5.4 2.0 2.0 2.0 900 900
Units mA V V mVp-p A V V mA mA
V25 VCTL VOFF IVCTL GM
2.0 0 -150 0.38
2.3 0 1.0 0.55
2.5 VREG +150 6.0 0.64
V V mV A A/V
VCTL offset range VCTL input bias current Voltage control gain
0.55A/V(TYP) 0.48 x VREG (TYP) VCTL
Notes: The note in the chart means items calculated and approved in design not the items proven by actual test result.
7
KA3084D
Electrical Characteristics (Continued)
(Ta=25C, VCC=12V, unless otherwise specified) Parameter FULL CIRCUIT Shutdown temperature note Temperature hysteresis FG / PG AMP Input offset voltage Input current Open loop gain
note note
Symbol TSD THYS VOFS IAMPIN GA VOHA VOLA VHYS VOLHYS VBHYS
Condition VIN=2.5V VCC=12V, Signal=500Hz VIN=2.0V VIN=2.7 VIN=2.0V -
Min. 130 65 VREG -1.48 130 7.0
Typ. 160 30 0 0.2 70 VREG -0.74 0.85 165 0.12 10
Max. 8 2.0 1.45 200 0.32 13
Units C C mV A dB V V mV V k
Output high voltage Output low voltage COMPARATOR (HYSTERESIS) Hysteresis level Output low voltage Output pull-up resistance
Notes: The note in the chart means items calculated and approved in design not the items proven by actual test result.
8
KA3084D
Application Informations
1. A DIAGRAM SUMMARIZING THE ENTIRE SYSTEM
HALL+ Hall_IN HALL-
IC AMP.
4IC
2IC DRIVE If
IO
IC
4IC GM
VCTL
V/I Converter
VREG TSD R2
R1
FG_IN
AMP & COMP
FG_OUT
PG_IN
AMP & COMP
PG_OUT
Figure 1.
Figure 1 is a conceptual diagram of the KA3084D. It shows that it turns on or off depending on the signal of the hall sensor used for sensing the rotor position of motor. The AMP, GM (Feedback) and output blocks are circuits used to determine current gain of KA3084D. Furthermore, HallIN represents the hall signal switch. It supplies stable bias to each VREG block. The TSD block is a thermal shutdown circuit that protects the IC during an high temperature inside the IC. Moreover, FG. and PG. blocks output individual signals generated in the motor using the amplifier and comparator. These signals transmit motor speed and position data to controller of external servo etc. for their control. 2. CURRENT CONTROL Figure 2 simplifies figure 1. The supplied IO current drives the motor and the Ic current controls the motor speed. Figure 3 is a graph of ICTL vs. IO.
9
KA3084D
ICTL AT
IO
Figure 2.
IO IOmax AT
ICOmax
ICTL
Figure 3.
3. VOLTAGE CONTROL Even though KA3084D command uses Ic to control the magnitude of IO, it can also use voltage. KA3084D mainly uses voltage control and has option to use current control.
VCTL
ICTL V/I Converter AT
IO
Figure 4.
Figure 4 shows the principle of the voltage control. The VCTL is the motor speed control voltage, and the ICTL is converted to current through the V / I converter. Figure 5 shows the graph of VCTL vs. IO.
IO IOmax AT GM
0.48 x VREG (TYP)
VCTL
Figure 5.
10
KA3084D
Typical Performance Characteristics
5.0 4.0 VREG(V) 3.0 2.0 1.0 0.0 0 2 4 6 8 10 12 V CC(V) 14 16 18 20 VCTL = 0V 5 4 VREG(V) 3 2 1 0 -30-20-10 0 VCTL = 0V VCC = 12V 10 20 30 40 50 60 70 80 90
Temperature(C) Temperature()
1.VCC vs VREG
2.Temp. vs VREG
12 10 GM1(A/V) ICC(mA) 8 6 4 2 0 8 10 12 14 VCC(V) 16 18
0.63 0.58 0.53 0.48 0.43 0.38 8 10 12 V CC (V) 14 16 18 V CTL = 3.5V
VCTL ==3.5V VCTL 3.5V RL = = 10 K RL 10K
3.VCC vs ICC
4.VCC vs GM1
900 850 800 IO (mA) 750 700 650 600 550 500 8 10 12 VCC(V) 14 16 18 IO (mA)
900 850 800 750 700 650 600 550 500 8 10 12 V CC (V) 14 16 18
VVCTL = 3.5V CTL = 3.5V RL == 10K RL 10K
VCTL = 3.5V VCTL = 3.5V RL = 10K RL = 10K
5.VCC vs IOA
6.VCC vs IOB
11
KA3084D
Test Circuits
3 SW24 2 1 A FG_OUT 2mA
1
GND (Signal)
FGOUT
22 500A
VCC ICC 2 VCC2 FGAMPOUT 21
SW22 2 1
SW23 1
2
-500A
FG_AMPOUT 1 2 10(20W) 4 GND2(Power) FGIN 19 3 SW19 2 1 2 VREG 1 IREG=-20A 1 2 SW13 3 PG_IN 1 SW14 2 PG_AMPOUT SW1 3 OUT2P V25 20 SW21 2 1 2 SW20 1 FG_IN V25
~
1 2 1 2
SW2
5
OUT2N
SW3 6 OUT1P
K A 3 0 8 4 D
SW18 VREG 18
PGIN
17
10(20W) 7 GND1(Power) PGAMPOUT 16
SW15
1 SW16 1 2 2 A PG_OUT
2mA
-500A -500A
1 2
SW4
8
OUT1N
PGOUT
15
SW17
1 2 3
9
VCC1
VCTL
14
VCTL 1 VHALL_2N 2 1 2
VHALL_1P
1 SW5 10 2 H1P H2N 13
SW10
VHALL_1N
1 SW6 11 2 SW7 H1N H2P 12
SW9
VHALL_2P
SW12
+ - ~
- +
~
SW8
SW11
12
KA3084D
Typical Application Circuits
1
GND(Signal)
FGOUT
22
2
VCC2
FGAMPOUT
21
3
OUT2P
V25
20
4
GND2(Power)
FGIN
19
5
OUT2N
M 6 OUT1P
K A 3 0 8 4 D
VREG
18 PG
PG_IN
17
7
GND1(Power)
PGAMPOUT
16
8 VREG 9
OUT1N
PGOUT
15
VCC1
VCTL
14
VCTL
HALL
10
H1P
H2N
13
11
H1N
H2P
12
HALL
13
KA3084D
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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