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Part: FAN8420D3
Category:
Power Management
-> Motor Controller/Drivers
-> DC Motor drivers/Controllers
-> DC Motor Drivers
Description: 3-Phase BLDC Motor Driver With 3.3V Interface
Company: Fairchild Semiconductor
Datasheet: Download FAN8420D3 datasheet File size : 400 kB
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FAN8420D3
3-Phase BLDC Motor Driver
Features
· · · · · · · · · · 3-phase, full-wave, linear BLDC motor driver Power save at stop mode Built-in current limiter Built-in TSD (Thermal shutdown) circuit Built-in 3X and 1X hall FG output Built-in hall bias circuit Built-in rotational direction detector Built-in reverse rotation preventer Built-in short braker Corresponds to 3.3V DSP
Description
The FAN8420D3 is a monolithic IC, suitable for a 3-phase spindle motor driver of a CD-media system.
28-SSOPH-375SG2
Typical Applications
· · · · · · · Compact disk ROM (CD-ROM) spindle motor Compact disk RW (CD-RW) spindle motor Digital video disk ROM (DVD-ROM) spindle motor Digital video disk RAM (DVD-RAM) spindle motor Digital video disk Player (DVDP) spindle motor Other compact disk media spindle motor Other 3-phase BLDC motor
Ordering Information
Device Package Operating Temp. -25°C ~ +75°C -25°C ~ +75°C FAN8420D3 28-SSOPH-375SG2
FAN8420D3TF 28-SSOPH-375SG2
Rev. 1.0.1 Oct. 2000.
©2000 Fairchild Semiconductor International
FAN8420D3
Pin Assignments
FG1X
FG3X
VCC
ECR
CS1
S/ S
DI R
VM
NC
EC
NC 16 13 H3+
28
27
26
25
24
23
22
21
20
19
18
17
15
FAN8420D3
1 NC
2 A3
3 NC
4 A2
5 NC
6 NC
7 A1 FIN(GND)
8 GND
9 H1+
10 H1-
11 H2+
12 H2-
14 H3-
Pin Definitions
Pin 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 NC A3 NC A2 NC NC A1 GND H 1+ H1 - H 2+ H2 - H 3+ H3 - VH NC PC1 SB FG 3X DIR ECR EC I/O O O O I I I I I I I I O O I I No connection Output (A3) No connection Output (A2) No connection No connection Output (A1) Ground Hall signal (H1+) Hall signal (H1-) Hall signal (H2+) Hall signal (H2-) Hall signal (H3+) Hall signal (H3-) Hall bias No connection Phase compensation capacitor Short brake FG waveform (3X) Rotational direction output Output current control reference Output current control voltage Pin Function Description
2
Rev. 1.0.1 Oct.. 2000.
VH
SB
FIN(GND)
PC1
FAN8420D3
Pin Definitions (Continued)
Pin Number 23 24 25 26 27 28 Pin Name S/S FG 1X VCC NC VM CS1 I/O I O FG waveform (1X) Supply voltage (Signal) No connection Supply voltage (Motor) Output current detection Pin Function Description Power save (Start/Stop switch)
Internal Block Diagram
FG1X VCC ECR CS1 PC1 DIR S/S VM NC NC EC VH 15 14 H3 - Hall TSD Upper Distributor Detection Detector Hall amp 12 H2 - 13 H3+ SB 18 GND FG3X 19
28
27
26
25
24 FG1X Generator
23
22 - +
21
20
17
16
Start Stop
Reverse rotation
Current sense Amp
Output Current limit
1 NC
2 A3
3 NC
4 A2
5 NC
6 NC
7 A1 GND
Lower Distributor
8 GND
9 H1+
Commutation Selector
Logic
Absolute Values
FG3X Generator 10 H1 -
Rev. 1.0.1 Oct. 2000.
H2+
Short Brake 11
3
FAN8420D3
Equivalent Circuits
Hall input Driver output
27 9 11 13 10 12 14
28
50
1k
1k
50
2
4
7
Torque control input
Hall bias input
50 21 50 22
+
-
15
100k
Start / Stop input
Short brake input
50 23
40k 18 30k
50
1k
20k
FG output
VC C 10k 50 19 24 30k VC C
Dir output
50 20
4
Rev. 1.0.1 Oct.. 2000.
FAN8420D3
Absolute Maximum Ratings (Ta = 25°C) °
Parameter Maximum supply voltage (Signal) Maximum supply voltage (Motor) Power dissipation Maximum output current Operating temperature range Storage temperature range Symbol VCCmax VMmax PD IOmax TOPR TSTG Value 7 15 2.5note 1.3 -25 ~ +75 -55 ~ +150 Unit V V W A °C °C
NOTE: 1. When mounted on a 76.2mm × 114mm × 1.57mm PCB (Phenolic resin material). 2. Power dissipation reduces 16.6mW/°C for using above Ta = 25°C ° ° 3. Do not exceed PD and SOA (Safe operating area).
Power Dissipation Curve
Pd (mW) 3,000 2,000 SOA
1,000 0
0
25
50
75
100
125
150
175
Ambient temperature, Ta [°C]
Recommended Operating Conditions (Ta = 25°C) °
Parameter Supply voltage Motor supply voltage Symbol VCC VM M in . 4.5 3.0 Typ. 5 12 Max. 5 .5 14 Unit V V
Rev. 1.0.1 Oct. 2000.
5
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