L7203S データシートの表示（PDF） - STMicroelectronics
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L7203S
STMicroelectronics
L7203S Datasheet PDF : 13 Pages
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L7203
DESCRIPTION (continued)
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
STB
PRS
VM
U
V
W
RF
RF1
H+
H-
SO20
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
D98IN928A
FSYS
HFG
SRC
DGND
AGND
VCC
ISR
HBIAS
PHS
PWMIN
PRS
N.C.
N.C.
VM
U
V
N.C.
W
RF
N.C.
RF1
H+
SSO24
1
24
2
23
3
22
4
21
5
20
6
19
7
18
8
17
9
16
10
15
11
14
12
13
D01IN1174
STB
FSYS
HFG
SRC
DGND
AGND
VCC
ISR
H BIAS
PHS
PWMIN
H-
2/13
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