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L7203S 데이터시트 PDF




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부품번호 L7203S 기능
기능 SMOOTH DRIVE SPINDLE MOTOR FOR OPTICAL DRIVE APPLICATION WITH POWER INTEGRATED
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L7203S 데이터시트, 핀배열, 회로
® L7203
SMOOTH DRIVE SPINDLE MOTOR FOR OPTICAL DRIVE
APPLICATION WITH POWER INTEGRATED
SMOOTH DRIVESYSTEM
1.8A DRIVE PEAK CAPABILITY
SLEW RATE CONTROL
INDUCTIVE SENSE START-UP ROUTINE
THERMAL SHUTDOWN
SUITABLE FOR 5V AND 12V APPLICATION
ONLY ONE HALL SENSOR IS REQUIRED
DESCRIPTION
The L7203 SPINDLE MOTOR IC includes a three
phase brushless spindle motor controller and the
power stage in switching mode. The device is de-
signed for both 5V and 12V OPTICAL DRIVE ap-
plication requiring up to 1.8A peak of current.
The device is realized in BCD5, a 0.7 µm Mixed
technology.
The spindle motor position detection is carried
out by means of a single comparator with hyster-
esis. In the start-up phase the "inductive sense
BLOCK DIAGRAM
SO20
SSO24
ORDERING NUMBERS: L7203 (SO20)
L7203S (SSO24)
start up method" is used to detect the rotor posi-
tion, determining the direction of starting rotation.
This procedure is implemented by a logic circuit
on chip.
The device applies three sinusoidal voltages to
the motor coils.
This is obtained through the application of the
April 2001
PRS
LOW VOLTAGE
DETECTOR
SRC
AGND
DGND
1/13




L7203S pdf, 반도체, 판매, 대치품
L7203
THERMAL DATA
Symbol
Rth j-pins
Rth j-amb
Parameter
Thermal Resistance Junction to Pins
Thermal Resistance Junction to Ambient
Max.
Max.
Value
16
90
ABSOLUTE MAXIMUM RATINGS
Symbol
Tamb
Top
Tsmin
VM
VCC
PD1
ESD
TSTG
IOLHFG
IPeak
Parameter
Ambient Temperature
Operating Temperature
Minimum Thermal Circuit Threshold
U, V, W, (low side drive =off)
PWMIN, PHS, FSYS, TEST, STB, HFG, BIAS, H+, H-, RF1,
RF, ISR, PORPin
Power dissipation at sustained operation with a package Rthj-amb
at 90°C
Susceptibility
Storage Temperature
HFG open drain current
Motor Peak Current
Value
-20 to 80
0 to 150
140
-0.3 to 15
-0.3 to 7
-0.3 to 17
-0.3 to VCC+0.3
1
2000
-55 to 150
10
1.8
Unit
°C/W
°C/W
Unit
°C
°C
°C
Vdc
Vdc
Vdc
Vdc
W
Vac
°C
mA
A
DC ELECTRICAL CHARACTERISTICS ( VCC = 5V; VM = 12V; Tamb = 25°C unless otherwise specified)
Symbol
SUPPLY
VCC
VM
VM
IVcc
Parameter
Supply 5V operating range
Supply 12V operating range
Supply 5V operating range
VCC Supply Current
VVM VM Supply Current
PWMIN, PHS, PRS, Fsys
ViL Input Low Voltage
ViH Input High Voltage
ViHYS
Input Hysteresis
Iz Leakage Current
STB
ViL Input Low Voltage
ViH Input High Voltage
VOL Open Drain Output
ViHYS
Input Hysteresis
Iz Leakage Current
HFG
VOL Open Drain Output
Iz Leakage Current
Test Condition
Min. Typ. Max. Unit
(note 1)
VCC = 5.75; fsys = 20MHz STB = 0
(bias pin open)
STB =1
VM = 13.8
STB = 0
STB =1
4.25
10.2
4.25
5.75
13.8
5.75
1.3
20
1
7
V
V
V
mA
mA
mA
mA
VCC = 5.75
1V
2.2 V
100 mV
-10 +10 µA
IOL = 2mA VCC = 4.25V
VCC = 5.75, Therm off
IOL = 2mA VCC = 5V
VCC = 5.75, HFG hiz
1V
2.2 V
0.4 V
100 mV
-10 +10 µA
0.4 V
-10 +10 µA
4/13

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L7203S 전자부품, 판매, 대치품
L7203
Fscan has a frequency 36 times of (1/T). The
Fscan is generated from the Zero-cross fre-
quency measured at the previous cycle.
So, if the motor speed changes, the zero-cross is
not constant, the Frequency Multiplier adjusts the
scan clock, ensuring the synchronization between
the Zero-Cross signal and the sinusoidal output
voltage.
Memory and Memory Scan
The memory stores 3x36 samples describing 3
signals. As each sample is represented in a byte,
it may have a value in the range 0 to 255.
The shape of these three signals are designed in
order to generate three sinusoidal voltages
across the Motor coils ensuring the highest per-
formances in term of power losses and motor
speed. The shape of the signals are reported in
fig. 7.
In Fig 8 is swown the "differential" voltage across
the motor coil U and the motor coil V. Obviously,
the voltage shape across the motor coil U and W
and the voltage across the motor coil V and W
are also sinusoidal and dephased of 120 and 240
degrees respect the voltage shown in fig. 8.
The Memory and Memory scan block receives
the scan clock, and at each clock provides the
sample addressed by an internal address regis-
ter.
Figure 7.
D98IN930
V UW
Figure 8.
U-W
D98IN931
This register is initialized with the memory ad-
dress of the wave sample synchronized with the
Zero-Cross signal. The maximum efficiency (i.e.
the maximum motor speed for a particular value
of current) for the motor driving may be reached
ensuring a particular value PH of dephase be-
tween the Zero-Cross signal and the voltage out-
put signal.
This value is written by the external controller us-
ing PHS pin (see Phase Shift Block section).
Kval Block and PWM interface
This unit contains a register storing the Kval
value. The Kval value represents a multiplying
factor to modulate the 3 profile signals amplitude
and it is generated starting from the PWMIN sig-
nal coming from the external system controller.
The Kval block receives the PWMIN signals and
calculates the Kval value through the reference
triangular signal.
This signal is generated by a 10 bit counter that
starts counting from 1023 to 0 at Fsys rate, and
then restart up to 1023. The resolution is ±1LSB.
Internal triangular wave is synchronized with the
PWMIN falling edge.
The PWMIN signal contains information regard-
ing both the amplitude and to the sign of the con-
trol variable. If the duty cycle is less than 50% the
Kval is in the range (-1023, -1), while if the duty
cycle is equal or greater than 50% the kval is in
the range (0, 1023).
A negative Kval value (i.e. PWM duty cycle from
0 to 50%) indicates an active brake and gener-
ates a 180 degree shift in the voltage profile
scan.
The rising edge of the PWMIN signal determines
the kval on the reference triangular waveform.
If the PWMIN signal is stable during the entire cy-
cle, the Kval is evaluated according to the follow-
ing rule:
- PWMIN signal stable to 1 -> Kval = +1023
- PWMIN signal stable to 0 -> Kval = -1023
In order to ensure the synchronization between
Figure 9.
1023
INTERNAL
REFERENCE
SIGNAL
0
PWMIN
KVAL < 0 KVAL > 0
KVAL < 0
D98IN884
7/13

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L7203

SMOOTH DRIVE SPINDLE MOTOR FOR OPTICAL DRIVE APPLICATION WITH POWER INTEGRATED

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L7203S

SMOOTH DRIVE SPINDLE MOTOR FOR OPTICAL DRIVE APPLICATION WITH POWER INTEGRATED

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