Fairchild Semiconductor KA2822DTF, KA2822D, KA2822BDTF, KA2822BD Datasheet
KA2822D
3-Phase BLDC Motor Driver
www.fairchildsemi.com
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 (I
PEAK
Description
The KA2822D is a monolithic integrated circuit, and suitable for the three-phase spindle motor driver of FDD system.
28-SSOPH-375
: 1A)
Typical Application
• 3.5-inch floppy disk drive (FDD) spildle motor
• Other 3-phase BLDC motor
©2000 Fairchild Semiconductor International
Ordering Information
Device Package Operating Temp.
KA2822D 28-SSOPH-375 0 ~ 75°C
KA2822DTF 28-SSOPH-375 0 ~ 75°C
KA2822BD 28-SSOPH-375 0 ~ 75°C
KA2822BDTF 28-SSOPH-375 0 ~ 75°C
Rev. 1.0.1
May. 2000.
1
KA2822D
Pin Assignments
FG INPUT(−)
AGC
INDEX PULSE WIDTH
VOLTAGE REG
INDEX BURST
INDEX OUTPUT
CE
SIGNAL GROUND
FG ZERO CROSS
FG OUTPUT
RPM SELECT
CHARGE PUMP OUTPUT
OSC INPUT
NC
1
2
3
4
5
6
7
28
27
26
25
24
23
22
KA2822D
8
9
10
11
12
13
14
21
20
19
18
17
16
15
FG INPUT(+)
HALL BIAS
CURRENT DETECTION1
V INPUT(−)
V INPUT(+)
U PHASE OUTPUT
V PHASE OUTPUT
FINFIN
W PHASE OUTPUT
NC
U INPUT(+)
U INPUT(−)
CURRENT DETECTION2
V
CC
PHASE COMPENSATION
2
Pin Definitions
Pin Number Pin Name I/O Pin Function Description
1 FG_INPUT I Negative input pin FG signal amp.
2 AGC I Automatic gain control input pin
3 INDEX PULSE WIDTH O Index pulse width detection (1.1V) pin
4 VOLTAGE REGULATOR O Voltage (2.2V) generator output pin
5 INDEX BURST O Index pulse width detection (1.4V) pin
6 INDEX OUTPUT O Index pulse output pin
7 CE I Chip enable (Active low)
8 SIGNAL GROUND - Signal ground
9 FG ZERO CROSS O FG signal zero cross detection pin
10 FG OUTPUT O FG signal output pin
11 RPM SELECT I RPM selection pin (L: 300, H: 360rpm)
12 CHARGE PUMP OUTPUT O Charge pump output pin
13 OSC INPUT I 1MHz oscillation input pin
14 NC - No connection
15 PHASE COMPENSATION I Phase compensation cap. connection pin
16 V
17 CURRENT DETECTION2 I Over current detection pin
18 U INPUT (−) I Negative input pin of U phase amp
19 U INPUT (+) I Positive input pin of U phase amp
20 NC - No connection
21 W PHASE OUTPUT O W phase output pin
22 V PHASE OUTPUT O V phase output pin
23 U PHASE OUTPUT O U phase output pin
24 U INPUT (+) I Positive input pin of V phase amp
25 V INPUT (−) I Negative input pin of V phase amp
26 CURRENT DETECTION1 I Over current detection pin
27 HALL BIAS I Hall sensor bias input pin
28 FG INPUT (+) I Positive input pin of FG signal amp
FIN POWER GROUND - Power ground
CC
- 5V power supply pin
KA2822D
3
KA2822D
Internal Block Diagram
U INPUT (+)
U INPUT(−)
V INPUT (+)
V INPUT(−)
AGC
HALL BIAS
CE
FG INPUT(+)
FG INPUT(−)
FG OUTPUT
Output
Control
CURRENT
DETECTION2
V
CC
16 17 26
19
18
24
25
2
27
7
28
1
10
+
U_AMP
−
+
V_AMP
−
AGC
Start-up
CE
FG_AMP
+
−
1.3V
Hall
Zero-cross
FG
Zero-cross
CURRENT
DETECTION1
U_OUT
V_OUT
W_OUT
CON_AMP
BUF_AMP
TSD
23
U PHASE
OUTPUT
22
U PHASE
OUTPUT
21
W PHASE
OUTPUT
−
+
0.24V
15
PHASE
COMPENSATION
−
0.69V
+
FG ZERO
CROSS
VOLTAGE REG.
INDEX BURST
OSC INPUT
9
Timing
Detectpr
4
5
13
2.2V
Rpm_select
OSC
NC RPM SIGNAL NCFIN
11_divider
Burst_time
Circuit
Speed
Control
SELECT GROUND
Pulse_width
Adjustment
Charge
Pump
6
INDEX
OUTPUT
3
INDEX PULSE
WIDTH
12
CHARGE
PUMP
OUTPUT
2081114
4
Equivalent Circuits
vcc
vcc
U_amp, V_ amp input U, V, W drive output and current detection 1, 2
vcc
5k
Ω
vcc
KA2822D
(17Pin,
26Pin)
V
CC
(16Pin)
(19Pin,
25Pin)
vcc
2.5k
Ω
2.5k
Ω
(18Pin,
U
(23Pin)
24Pin)
40k
Ω
40k
Ω
FG input and FG output OSC input
vcc
0.5k
25k
0.5k
Ω
Ω
Ω
(28Pin)
vcc
(13Pin)
vcc
(10Pin)
CE input Hall bias input and voltage regulator output
vcc
0.1k
V
40k
(22Pin)
Ω
W
(21Pin)
vcc
Ω
5k
Ω
50pF
1k
Ω
CE
vcc
vcc
vcc
(27Pin)
3k
Ω
vcc
vcc
2.9V
vcc
(4Pin)
2.2V
5
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