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SI-7230 数据表(PDF) 3 Page - Sanken electric

部件名 SI-7230
功能描述  Bipolar Driver IC
Download  5 Pages
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制造商  SANKEN [Sanken electric]
网页  http://www.sanken-ele.co.jp/en
标志 SANKEN - Sanken electric

SI-7230 数据表(HTML) 3 Page - Sanken electric

  SI-7230 Datasheet HTML 1Page - Sanken electric SI-7230 Datasheet HTML 2Page - Sanken electric SI-7230 Datasheet HTML 3Page - Sanken electric SI-7230 Datasheet HTML 4Page - Sanken electric SI-7230 Datasheet HTML 5Page - Sanken electric  
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52
SI-7230M
Application Note
s 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 RX to
infinity (open).
To compute IO when different values are used for RS and
VCC2, use the approximation formula below. The maximum
ripple value IOH of the output current waveform can be
computed as follows:
1
IOH(max) =
(0.233•VCC2–0.026) [A]
RS
1
IOH(min) =
(0.214•VCC2–0.021) [A]
RS
The graph of the equations above is shown below.
s Power down mode
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 de-
creased.
s Surge absorption capacitor
CA 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 CA and CB. 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 VSP across the ca-
pacitors is given by the equation:
L
VSP =•IO + VCC
C
where, L : Motor coil inductance between pins 4 and
5 or pins 18 and 17
C : Capacitance of CA and CB
IO : Output current
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 CA and CB.
(1) VSP must not exceed the breakdown voltage of the
hybrid IC (70V).
(2) CA and CB are charged/discharged in the same rate as
the phase is switched. Hence, a capacitor with excel-
lent anti-ripple characteristics should be selected.
Waveform of the output current
IOH
SI-7230M Output current IOH vs. Current detection resistor Rs
3
2
1
0
Current detection resistor Rs (
Ω)
02
13
4
IOH(max) =
(0.233VCC2 – 0.026)
IOH(min) =
(0.214VCC2 – 0.021)
1
RS
1
RS
SI-7230M Output current IOH vs. Variable current resistor Rx
3
2
1
0
Variable current resistor Rx (k
Ω)
02
13
4
RS = 0.3
RS = 0.6
IOH(max) =
VCC2 – 0.026
IOH(min) =
VCC2 – 0.021
1
RS
1
RS
4.9
RX
4.843 +
1.131
5.165 +
1.107
51
RX
RX
Tr
9
11
13
SI-7230M


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