FAIRCHILD KA2821D

www.fairchildsemi.com
KA2821D
Stepping Motor Driver
Features
Description
•
•
•
•
•
•
•
The KA2821D is a monolithic integrated circuit, and suitable as a two-phase stepping motor driver of a 3.5-inch FDD
system.
Built-in chip enable function (Active low)
Low saturation voltage
Low power dissipation
Input level: TTL, LSTTL, 5V CMOS compatible
Standard MPU direct interface
Built-in Thermal Shutdown(TSD) circuit
2-CH H-bridge driver
20-SOP-300
Typical Application
Ordering Information
• Floppy disk drive (FDD)
• General stepping motor
Device
Package
Operating Temp.
KA2821D
20-SOP-300
−20 ~ +75°C
Rev. 1.0.2
May. 2000.
©2000 Fairchild Semiconductor International
1
KA2821D
Pin Assignments
NC
VCC
1
20
2
19
3
18
4
17
5
16
NC
NC
VSA
AOUT
SGND
AOUT
PGND
KA2821D
6
PGND
15
PGND
PGND
7
14
8
13
9
12
10
11
SGND
BOUT
DIRB
BOUT
CE
VSB
NC
NC
Pin Definitions
Pin Number
Pin Name
I/O
Pin Function Description
Channel
1
NC
-
No connection
2
VCC
-
Logic part supply voltage
A, B
3
DIRA
I
A-channel direction input
A
4
SGND
-
Signal ground
A, B
5
PGND
-
Power ground
A, B
6
PGND
-
Power ground
A, B
7
SGND
-
Signal ground
A, B
8
DIRB
I
B-channel direction input
9
CE
I
Chip enable input
10
NC
-
No connection
-
B
A, B
-
11
NC
-
No connection
-
12
VSB
-
B-channel seeking supply voltage
B
13
BOUT
O
B-channel output
B
14
BOUT
O
B-channel inverting output
B
15
P-GND
-
Power ground
A, B
16
P-GND
-
Power ground
A, B
17
AOUT
O
A-channel inverting output
A
18
AOUT
O
A-channel output
A
19
VSA
-
A-channel seeking supply voltage
A
20
NC
-
No connection
-
2
KA2821D
Internal Block Diagram
VCC
DIRA
19
VSA
18
AOUT
17
AOUT
16
PGND
12
VSB
14
BOUT
13
BOUT
15
PGND
2
3
TTL
Interface
TSD
DIRB
8
CE
9
TTL
Interface
3
KA2821D
Absolute Maximum Ratings (Ta = 25°C)
Parameter
Symbol
Value
Unit
VCC
7.0
V
VSA, B
15.0
V
Input voltage
VIN
0 ~ VCC
V
Seeking output current (Continuouts)
IOS
330
mA
IOSPEAK
500
mA
Logic part supply voltage
Seeking supply voltage
Seeking output current (Peak)
Package power dissipation
PD
1.0
W
Operating temperature range
TOPR
−20 ~ 75
°C
Storage temperature
TSTG
−40 ~ 125
°C
Power Dissipation Curve
1.33
Power
Dissipation
: PD[W] 1.0
1.0
0.5
0
0
25
50
75
100
125
150
175
Ambient temperature, Ta [°C]
Recommended Operating Conditions (Ta = 25°C)
Parameter
Logic part supply voltage
Seeking supply voltage
Symbol
Min.
Typ.
Max
Unit
VCC
4.5
5.0
5.5
V
VSA, B
4.5
-
13.8
V
4
KA2821D
Electrical Characteristics
(Ta=25°C, VCC=5V, VSA=12V, VSB=12V, unless specified otherwise)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Units
Digital input “L” voltage
VIL
-
-
-
0.8
V
Digital high level input voltage
VIH
-
2.0
-
-
V
Digital low input current
IIL
VIN=0.8V
-
0
10
µA
Digital high input current
IIH1
VIN=2.0V
-
1
10
µA
IIH2
VIN=5V
-
0.3
1.0
mA
IVCCL
CE=0.8V
-
25
3
mA
Supply current
IVSL
CE=0.8V
-
6
10
mA
IVCCH
CE=0.8V
-
25
33
mA
IVSH
CE=2.0V
-
1
2
mA
Output sustain voltage
VSUS
IO=10mA, CE=0.8V
18
-
-
V
VSA, B output saturation voltage
VSAT1
IO=300mA, CE=2.0V
-
1.5
2.0
V
VFU
IO=130mA (Upper)
-
3.0
5.0
V
VFL
IO=330mA (Lower)
-
1.5
2.0
V
TPLH
Input pulse (2kHz)
-
1.0
5.0
µs
TPHL
Input pulse (2kHz)
-
1.0
5.0
µs
Output clamp voltage
Output delay time
TSD operating temperature
TSD hysterisis
TSD
-
125
150
-
°C
∆TSD
-
-
25
-
°C
5
KA2821D
Application Information
1. MOTOR CONTROL LOGIC
Mode selection-truth table
Input
Output
CE
DIRY
YOUT
YOUT
L
L
L
H
L
H
H
L
H
L
X
X
H
H
X
X
Notes:
DIRY: DIRA or DIRB (Direction input)
YOUT: AOUT or BOUT (Non-inverting output)
YOUT: AOUT or BOUT (Inverting output)
Y: Indicate each channel (A and B)
X: High impedance
2. MAXIMUM CURRENT DRIVE CAPACITY
• Peak seeking output current: 0.5A
• Continuous seeking output current: 0.33A
• Holding output current: 0.2A
6
Operating Mode
Seeking Mode
Open Mode
KA2821D
Timing Chart
CE
DIRA, B
TPLH
TPHL
50%
A, BOUT
A, BOUT
TPLH
TPHL
Typical Application Circuits
1
20
NC
NC
VCC(5V)
VCC
A-CH in
DIRA
SGND
PGND
2
19
3
18
4
17
5
16
PGND
6
SGND
DIRB
KA2821D
VSA
AOUT
Load A
AOUT
PGND
15
PGND
7
14
BOUT
8
13
BOUT
9
12
10
11
Load B
B-CH in
Chip enable in
CE
VSB
NC
NC
7
KA2821D
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.
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.
www.fairchildsemi.com
12/1/00 0.0m 001
Stock#DSxxxxxxxx
 2000 Fairchild Semiconductor International