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參數(shù)資料
| 型號： | L7203 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | SMOOTH DRIVE SPINDLE MOTOR FOR OPTICAL DRIVE APPLICATION WITH POWER INTEGRATED |
| 中文描述： | 傳動平穩(wěn)主軸馬達驅(qū)動功率集成應(yīng)用光學(xué) |
| 文件頁數(shù)： | 6/13頁 |
| 文件大?。?/td> | 170K |
| 代理商： | L7203 |
Inductive Sense Start Up Block
The inductive sense method allows to determine
the position and the direction of the starting rota-
tion of the motor.
With the rotor at rest, a voltage Vn is applied sub-
sequently to two motor phases, according to this
sequence: UW, VW, VU, WU, WV, UV.
A timer measures the rise time dT to reach the
reference current ISR in each phase.
This reference is fixed on the pin ISR with a resis-
tor divider between the pin BIAS and GND.
Through a comparator is possible to determine
the phase which has the minimum rise time and
so the rotor position is univocally determinated.
The start up is a procedure allowing to start the
motor avoiding any backrotation. This procedure
is realized by a customized logic on chip (no
modification required in the external microproces-
sor software).
For the Motor Connection please refer to the Fig. 4.
Current Limiter
The current limiter aim is to avoid that the current
in the motor winding overides a fixed threshold
value. The voltage input at the pin RF1 is com-
pared with an internal 0.2V reference.
When the current exceeds the Ilimit value a flip-
flop is reset masking (through a combinational
logic) the signal to the power windings.
Rotor Position Detector
This block is connected to the Hall Sensor Out-
put. A comparator with hysteresis receives the
sinusoidal hall-sensor signal and generates a
squared signal HOUT.
The Zero-Cross signal is generated starting from
the HOUT signal as in fig. 5.
The HOUT signal can be read from the micro-
processor on the output open drain pin HFG.
Frequency multiplier
The Frequency Multiplier generates the memory
scan frequency (Fscan) starting from the Zero-
Cross (ZC) signal from the Rotor Position Detec-
tor block. The scan frequency relates to the rate
of the samples of the input signals.
The number of wave samples in a period T is 36,
so this circuit generates 36 pulses between 2
Zero Crossing.
CURRENT LIMIT
RF1
D98IN882
0.2V
-
+
R
S
TO THE POWER STAGE
SET EVERY
255 CLOCK
CYCLE
INTERNAL
REFERENCE
Figure 3.
HOUT
H+
D98IN883A
-
+
COMPARATOR WITH HYSTERESIS
H-
HOUT
ZC
Figure 5.
T
ZC
Fscan
1
2
3
4
5
6
7
8
35
36
D98IN879
Figure 6.
R1
TIMER
ISR
D98IN881
BIAS
RF1
R2
-
+
Figure 2.
L7203
3
Bemf coil B
Hall sensor
Bemf coil C
Bemf coil A
MOTOR COIL A
MOTOR COIL B
MOTOR COIL C
U
V
W
H+
H-
H+
H-
MOTOR
D01IN1175
Figure 4. Motor Connections.
L7203
6/13
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L7203S | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:SMOOTH DRIVE SPINDLE MOTOR FOR OPTICAL DRIVE APPLICATION WITH POWER INTEGRATED |
| L7204 | 功能描述:重負(fù)荷電源連接器 PLUG-YC-#2/0-PC RoHS:否 制造商:Hirose Connector 系列:PS2 產(chǎn)品類型:Connectors 位置/觸點數(shù)量: 端接類型:Crimp 觸點材料: 觸點電鍍:Gold 電壓額定值: 電流額定值:300 A 附件類型: |
| L7204A | 制造商:Agilent Technologies 功能描述:L7204A / Switch, SP4T, DC-4 GHz, unterminated, 24VDC (L-SERIES) |
| L7204B | 制造商:Agilent Technologies 功能描述:L7204B / Switch, SP4T, DC-20 GHz, unterminated, 24VDC (L-SERIES) |
| L7204C | 制造商:Agilent Technologies 功能描述:L7204C / Switch, SP4T, DC-26.5 GHz, unterminated, 24VDC (L-SERIES) |
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