Fairchild Semiconductor KA2822DTF, KA2822D, KA2822BDTF, KA2822BD Datasheet |
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www.fairchildsemi.com 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 (I PEAK: 1A) Typical Application •3.5-inch floppy disk drive (FDD) spildle motor •Other 3-phase BLDC motor Description The KA2822D is a monolithic integrated circuit, and suitable for the three-phase spindle motor driver of FDD system. 28-SSOPH-375 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. ©2000 Fairchild Semiconductor International 1 KA2822D Pin Assignments FG INPUT(−)
FG INPUT(+)
1 28
AGC
2 27
HALL BIAS
INDEX PULSE WIDTH
3 26
CURRENT DETECTION1
VOLTAGE REG
4 25
V INPUT(−)
INDEX BURST
5 24
V INPUT(+)
INDEX OUTPUT
6 23
U PHASE OUTPUT
7 22
V PHASE OUTPUT CE
FIN KA2822D
FIN
SIGNAL GROUND
8 21
W PHASE OUTPUT
FG ZERO CROSS
9 20
NC
FG OUTPUT
10 19
U INPUT(+)
RPM SELECT
11 18
U INPUT(−)
CHARGE PUMP OUTPUT
12 17
CURRENT DETECTION2
OSC INPUT
13 16
VCC
NC
14 15
PHASE COMPENSATION
2 KA2822D 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 VCC - 5V power supply pin
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
3 KA2822D Internal Block Diagram
VCC CURRENT CURRENT
DETECTION2 DETECTION1
16
17 26
U INPUT (+) 19 +
U_AMP
U_OUT
23 U PHASE U INPUT(−) 18 −
OUTPUT
V INPUT (+) 24 + Output
V_AMP
22
Control
V_OUT
U PHASE V INPUT(−) 25 −
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
+
FG_AMP
0.24V
FG INPUT(+) 28
15 PHASE +
COMPENSATION
FG
FG INPUT(−) 1 − Zero-cross
−
0.69V
+
10
BUF_AMP
FG OUTPUT
FG ZERO 9
CROSS
Timing Burst_time
Pulse_width
6 INDEX
Detectpr Circuit
Adjustment
OUTPUT VOLTAGE REG. 4
3 INDEX PULSE
2.2V
WIDTH INDEX BURST 5
Rpm_select Speed Charge 12
CHARGE
11_divider Control Pump OSC INPUT 13
PUMP OSC
OUTPUT
14 11 8
20
NC RPM SIGNAL FIN NC
SELECT GROUND
4 KA2822D Equivalent Circuits
U_amp, V_ amp input
U, V, W drive output and current detection 1, 2
vcc
(17Pin,
26Pin) vcc
vcc
VCC
(16Pin)
5kΩ
2.5kΩ
2.5kΩ
U
V
(19Pin,
(18Pin,
(23Pin)
(22Pin) W 25Pin)
24Pin)
(21Pin)
40kΩ 40kΩ 40kΩ
FG input and FG output
OSC input
vcc
vcc vcc vcc
0.5kΩ 0.5kΩ
vcc
(28Pin)
0.1kΩ
1kΩ
vcc (13Pin)
50pF
25kΩ
vcc
5kΩ
(10Pin)
CE input
Hall bias input and voltage regulator output
vcc vcc
vcc
vcc
vcc
2.9V
(27Pin)
vcc
CE 3kΩ
(4Pin)
2.2V
5
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