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PDF KA2822BD Data sheet ( Hoja de datos )
| Número de pieza | KA2822BD | |
| Descripción | 3-Phase BLDC Motor Driver | |
| Fabricantes | Fairchild | |
| Logotipo |  |
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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 (IPEAK: 1A)
Description
The KA2822D is a monolithic integrated circuit, and suit-
able for the three-phase spindle motor driver of FDD system.
28-SSOPH-375
Typical Application
• 3.5-inch floppy disk drive (FDD) spildle motor
• Other 3-phase BLDC motor
Ordering Information
Device
Package
KA2822D 28-SSOPH-375
KA2822DTF 28-SSOPH-375
KA2822BD 28-SSOPH-375
KA2822BDTF 28-SSOPH-375
Operating Temp.
0 ~ 75°C
0 ~ 75°C
0 ~ 75°C
0 ~ 75°C
©2000 Fairchild Semiconductor International
1
Rev. 1.0.1
May. 2000.
1 page  
KA2822D
Equivalent Circuits
U_amp, V_ amp input
U, V, W drive output and current detection 1, 2
vcc
(19Pin,
25Pin)
2.5kΩ
vcc
vcc
5kΩ
2.5kΩ
(18Pin,
24Pin)
40kΩ
U
(23Pin)
V
(22Pin)
40kΩ
40kΩ
(17Pin,
26Pin)
VCC
(16Pin)
W
(21Pin)
FG input and FG output
vcc
0.5kΩ
25kΩ
vcc
vcc
0.5kΩ
(28Pin)
vcc
vcc
(10Pin)
OSC input
vcc
(13Pin)
0.1kΩ
1kΩ
50pF
5kΩ
vcc
CE input
vcc
vcc
CE
3kΩ
Hall bias input and voltage regulator output
vcc
vcc
(27Pin)
vcc
2.9V
vcc
(4Pin)
2.2V
5
5 Page 
KA2822D
Application Information
1. CHIP ENABLE
This function turns on or off all blocks by low or high signal.
2. U, V AND W PHASE OUTPUT AMP
These ampilifiers drives 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 motor is on and speed error is detected by PLL.
The speed error sent to charge pump part which repeats charge and discharge controls the output current of the output amp to
keep a stable rotation.
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet KA2822BD.PDF ] | |
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