SANKEN SI

Bipolar Driver IC
SI-7230M
■ Ratings
(Ta = 25°C)
Absolute
maximum
rating
Supply voltage
Peak voltage of
pins C A and CB
(V)
(V)
Output current
Junction
temperature
(°C)
(A)
Operating
ambient
temperature (°C)
Storage
temperature
(°C)
Type No.
VCC1
V CC2
V SP
Io
Tj
Top
Tstg
SI-7230M
50
7
70
3.2
+125
–20 to +80
–30 to +100
■ Characteristics
Electrical
characteristics
Supply voltage
Output current
(V)
(mA/ø)
V CC1
V CC2
Type No.
min
typ max min
SI-7230M
15
30
45
*Comparator threshold voltage
4.5
IO
(V)
I OM
typ max min max min
5
5.5
200 3000 535
Excitation signal
input voltage
(V)
V THF
typ max min
VTHPD
typ max min
VIL(ON)
Excitation
signal
input
current
(mA)
Oscillation
frequency
V CC2
input
current
(kHz)
(mA)
IIL
F
VIH(OFF)
max
min
typ max
max
V CC2 VCC2
–0.4 +2
1.6
19
21
150
580 625 1.025 1.125 1.225 0.515 0.555 0.595
0
0.5
* VTHF : Conditions shown in the standard external connection diagram with VCC2 = 5V and R S = 1Ω
VTHPD : Conditions shown in the standard external connection diagram with R X = 1kΩ, V CC2 = 5V and RS = 1Ω
■ Block diagram
Auxiliary power
supply VCC2
Reference
voltage
Variable current
resistor Rx
Main power
supply VCC1
Comparator
amplifiter
Current
controller
M
Trigger pulse
generator
circuit
Excitation signal amplifier
Excitation signal
(4-phase)
Counter EMF
Canceller
SI-7230M
+
CA, CB
Current detection
resistor RS
■ Equivalent circuit diagram
AIN
7
CA
2
AOAO
4
5
AIN
8
BIN
15
BO BO
18
17
CB
20
BIN
14
D10
1
VCC1
D9
R1
10
VCC2
R2
Tr1
R3
Tr2
Tngger pulse
generator circoit
R49
11
VREF
R5
VrefA
G
12
13
VrefB
50
–
+
D2
R37 R38
Tr10
R10
R11
R6
R7
Tr13
R21
R29
Tr5
R30
Tr14
R22
R42
R44
R48
1C2/2
R45
Tr17
Tr18
R33
R18
R34
6
3
RSA G
R39 R40
D4
Tr12
R8
R28
R15
R14
Tr6
D3
R27
R26
D5 D6
Tr4
R12
Tr11
R25
R43 R41
R47
D1
R13
R50
9
Tr9
R4
Tr3
R9
Tr15
R23
R16
D7 D8
R31 Tr7
Tr8
R32
Tr16
R24
R19
1C1/2
R46
Tr19
R20
Tr20
R35
R36
6
19
RSB G
ICC2
typ max min max min max
25
SI-7230M
■ External dimensions
(Unit: mm)
Plastic package
69.0±0.5
7.0±0.5
63.0±0.4
3.5
3.8
16.6
Type No.
Lot No.
8.0 φ
1.8
35.0±0.5
SI-7230M
8.6±1
3.4
3
0.5
P = 2.54
Pin No.
1.4
12....................................20
■ Standard external connection diagram
VCC2
Excitation
signal input
Active Low
+
22µF
10V
AIN
AIN
BIN
BIN
A
A
B
B
VCC2
10
7
8
15
14
SI-7230M
11
VREF
VrefA 9
VrefB 13
AO
5
18 BO
17
2
PD
(Power down)
6
IO
CA
+
10µF
100V
20
CB
1612 3 19
+
10µF
100V
2SC2002
VCC1
BO
10K
RX
+
100µF
100V
VCC1
1
IO
AO
4
RSA RSB
G
* For details on the characteristics and thermal design, refer to the
technical manual.
51
SI-7230M
Application Note
■ Power down mode
■ Determining the output current IO
(motor coil current)
The output current, IO is fixed by the following elements:
RS : Current detection resistor
VCC2 : Supply voltage
RX : Variable current resistor
To operate a motor at maximum current level, set R X to
infinity (open).
To compute I O when different values are used for RS and
VCC2, use the approximation formula below. The maximum
ripple value I OH of the output current waveform can be
computed as follows:
1
(0.233•VCC2–0.026) [A]
IOH(max) =
RS
1
(0.214•VCC2–0.021) [A]
IOH(min) =
RS
The graph of the equations above is shown below.
IOH
Waveform of the output current
SI-7230M Output current IOH vs. Current detection resistor Rs
Output current IOH (A)
3
1
(0.233VCC2 – 0.026)
RS
IOH(min) = 1 (0.214VCC2 – 0.021)
RS
2
IOH(max) =
SI-7230M can be operated in power down mode. The circuit
is shown below. When transistor Tr is switched on, the
reference voltage drops and the output current can be decreased.
9
11
13
SI-7230M
RX
Tr
■ Surge absorption capacitor
C A and CB and capacitance
The upper diagram shown on the next page is the flow of the
counter EMF produced by the motor coils when it charges
CA and CB and the lower diagram shows the direction of the
energy discharged by C A and C B. When phase A shown in
the figure is off, the counter EMF (energy built-up by the coil
inductance) produced by the motor coils passes through the
path shown by the dotted lines and charges CA and CB.
When phase A is on, the energy stored by the capacitors are
discharged in the direction shown by the dotted lines in the
lower left diagram on the next page. The capacitors are
discharged until the voltage across their pins equal the
supply voltage VCC. The peak voltage V SP across the capacitors is given by the equation:
VSP =
L
•IO + VCC
C
where, L : Motor coil inductance between pins 4 and
5 or pins 18 and 17
1
C : Capacitance of C A and C B
IO : Output current
0
0
1
2
3
4
Current detection resistor Rs (Ω)
SI-7230M Output current IOH vs. Variable current resistor Rx
3
Output current IOH (A)
RS = 0.3Ω
RS = 0.6Ω
1
1
IOH(max) =
RS
IOH(min) = 1
RS
1
2
1.131
4.9 VCC2 – 0.026
4.843 +
RX
1.107
51 VCC2 – 0.021
5.165 +
RX
3
Variable current resistor Rx (kΩ)
52
(1) V SP must not exceed the breakdown voltage of the
hybrid IC (70V).
(2) C A and CB are charged/discharged in the same rate as
the phase is switched. Hence, a capacitor with excellent anti-ripple characteristics should be selected.
2
0
0
An example waveform of VSP is shown in the middle figure
on the next page.
A VSP that can be obtained when high voltage is applied can
also be produced by using the counter EMF when the coil
current rises.
Notes in selecting C A and CB.
4
SI-7230M
Application Note
Charging path of the counter EMF
Example VSP waveform
VCC
CA or CB
+
IOFF
–
A
10V/div
A
VCC
VSP
L
A
A
VCC = 30V
IO = 0.7A/φ
1-2 phase excitation
950PPS
1 ms/div
Discharge path of the counter EMF
VCC
CA or CB
+
ION
–
A
A
L
A
A
Torque vs. Response frequency
Pull-out torque τOUT (kg·cm)
5
4
With external capacitor
.
CA, B =3.3
. µF/100V
Without external capacitor
Pins [email protected] shorted
Measurement conditions VCC1 = 35V, VCC2 = 5V
IO = 2.5A/φ
2-phase excitation
Motor : 23LM-CO35
(Manufactured by Minevea)
Motor connection
A
3
B
2
1
A
0
100
500 1K
2K
5K
10K
X
B
X
X : Open
Response frequency f (pps)
53
SI-7200M, SI-7230M, SI-7115B, SI-7300A,
SI-7330A, SI-7500A and SI-7502
Handling Precautions
(Note: The SI-7502 is applicable for item (2) only.)
For details, refer to the relevant product specifications.
(1) Tightening torque:
The torque to be applied in tightening screws when mounting the IC on a
heatsink should be below 49N•m.
(2) Solvent:
Do not use the following solvents:
Substances that
Chlorine-based solvents
: Trichloroethylene,
dissolve the package
Trichloroethane, etc.
Aromatic hydrogen compounds : Benzene, Toluene,
Xylene, etc.
Ketone and Acetone group solvents
Substances that
weaken the package
Gasoline, Benzine and Kerosene
(3) Silicone grease:
The silicone grease to be used between the aluminum base plate of the hybrid
IC and the heatsink should be any of the following:
• G-746
SHINETSU CHEMICAL INDUSTRIES CO., LTD.
• YG6260
TOSHIBA SILICONE CO., LTD.
• SC102
DOW CORNING TORAY SILICONE CO., LTD.
Please pay sufficient attention in selecting silicone grease since oil in some
grease may penetrate the product, which will result in an extremely short
product life.
Others
• Resistance against radiation
Resistance against radiation was not considered in the development of these ICs
because it is assumed that they will be used in ordinary environment.
54