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SI-7200M 数据表(PDF) 3 Page - Sanken electric

部件名 SI-7200M
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-7200M 数据表(HTML) 3 Page - Sanken electric

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48
SI-7200M
Application Note
s Determining the output current IO (motor coil current)
The output current, IO is fixed by the following circuit
elements:
RS
: Current detection resistor
VCC-2 : Auxiliary supply voltage
Based on the specifications of SI-7200M, its output
current IO can be seen as:
IO1 (effective value): 390 to 490mA
To compute IO when different values are used for RS
and VCC-2, use the approximation formula below or
the graph at the right. The maximum ripple value IOH
of the output current waveform is within the IOH(MIN) ~
IOH(MAX) range shown by the following formulas:
1
IOH(max) =
(0.247xVCC-2–0.03) [A]
RS
1
IOH(min) =
(0.225xVCC-2–0.024) [A]
RS
To fine-adjust the output current, connect a 20K
variable resistor across pins 8 and 11.
.
.
.
.
Waveform of output current
0
IOH
s Power down mode
The SI-7200M can be operated in power down mode.
By pulling up pin 9 to high level IO can be reduced to
60% of the motor rotation current.
s Operating voltage range
The Sl-7200M can be used in applications (low coil
resistance RL and high supply voltage VCC) where SI-
7200E and SI-7230E cannot be used.
Output current vs. Current detection resistor
1.4
1.2
1.0
0.8
0.6
0.4
0.2
Current detection resistor Rs (
Ω)
01234
IOH
(max)5V
IOH (min)5V
Power down output current vs. Current detection resistor
1.2
1.0
0.8
0.6
0.4
0.2
0
Current detection resistor Rs (
Ω)
01234
IOH2 (max)5V
IOH2 (min)5V


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