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L7203 Datasheet(PDF) 2 Page - STMicroelectronics

Part # L7203
Description  SMOOTH DRIVE SPINDLE MOTOR FOR OPTICAL DRIVE APPLICATION WITH POWER INTEGRATED
Download  13 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L7203 Datasheet(HTML) 2 Page - STMicroelectronics

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SMOOTH DRIVING concept.
It is based on the idea of driving the motor wind-
ing through 3 sinusoidal voltages dephased of
120 degrees. The motor is controlled in voltage
mode, so no current control compensation net-
work is required.
Each profile is digitally described by 36 bytes
stored in a ROM memory.
These sinusoidal signals are modulated by multi-
plying each sample by a value stored in the KVAL
register. Using this kind of profiles it is possible to
obtain great advantages such as torque ripple
and acoustic noise reduction and lower EMI. An
easier track following is ensured, since vibration
are reduced.
The clock signal on the chip can be synchronized
to the external application clock signal.
An internal circuit can limit the current. The
threshold is fixed with a internal 0.2 V reference.
The device generates:
- a current generator to define output voltage
slew rate
- a 3.3 V reference to bias hall sensor.
- the HFG open drain output signal for speed
regulation.
The device includes :
- a circuit for thermal shutdown with hysteresis.
- a low voltage detector
In the STANDBY state the main functions of the
device are turned off, in order to minimize the
power consumption.
The STANDBY state of the device is imposed by:
- Thermal shutdown
- stand by signal from
µP
PIN CONNECTIONS
DESCRIPTION (continued)
PRS
N.C.
N.C.
VM
U
N.C.
V
W
RF
H BIAS
ISR
VCC
DGND
AGND
SRC
HFG
FSYS
STB
1
3
2
4
5
6
7
8
9
22
21
20
19
18
16
17
15
23
10
24
N.C.
PHS
D01IN1174
RF1
PWMIN
11
14
13
12
H+
H-
STB
PRS
VM
U
V
RF
W
RF1
H+
PHS
HBIAS
ISR
AGND
VCC
DGND
SRC
HFG
FSYS
1
3
2
4
5
6
7
8
9
18
17
16
15
14
12
13
11
19
10
20
H-
PWMIN
D98IN928A
SO20
SSO24
L7203
2/13


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