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SLA7021M Datenblatt(PDF) 5 Page - Sanken electric

Teilenummer SLA7021M
Bauteilbeschribung  Unipolar Driver ICs
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Hersteller  SANKEN [Sanken electric]
Direct Link  http://www.sanken-ele.co.jp/en
Logo SANKEN - Sanken electric

SLA7021M Datenblatt(HTML) 5 Page - Sanken electric

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SLA7024M, SLA7026M, SLA7027MU, SLA7022MU, SLA7029M,
SMA7022MU, SMA7029M, SLA7020M, SLA7021M and SDK03M
Application Note
Fig. 6 Circuit for fixing the coil current
Fig. 7 Circuit for fixing the coil current
Fig. 8 and 9 show the graphs of equations q and w ,
respectively.
Fig. 8 Output current Io vs. Current detection resistor Rs
Fig. 9 Output current lOPD vs. Variable current resistor rx
NOTE:
Ringing noise is produced in the current detection resistor
Rs when the MOSFET is switched ON and OFF through
chopping. This noise is also generated in feedback signals
from Rs which may therefore causes the comparator to
malfunction.
To prevent chopping malfunctions, r5(r6) and C3(C4) are
added in order to act as noise filter.
However, when the values of these constants are increased,
the response from Rs to the comparator becomes slow.
Hence, the value of the output current lo is higher to some
extent than the computed value.
SLA7024M
SLA7026M
SLA7027MU
C3
r2
r1
r6
r5
Vb(5V)
9,(10)
3,(14)
rX
Tr
Power down
signal
SDK03M
RS
C3
r2
r1
r6
r5
Vb(5V)
10
3
rX
Tr
Power down
signal
13 15
4
3
2
1
0
01234
Current detection resistor RS (
Ω)
SLA7024M, SLA7026M, SLA7029M, SLA7027MU,
SLA7022MU, SLA7020M, SLA7021M, SMA7029M,
SMA7022MU, SDK03M
IO=
r1+r2
RS
r1=510
r2=100
rx=
Vb=5V
r2
·
Vb
2
1.5
1
0.5
00
2.0
4.0
6.0
8.00
Variable current resistor rX (
Ω)
SLA7024M, SLA7026M, SLA7029M, SLA7027MU, SLA7022MU,
SLA7020M, SLA7021M, SMA7029M, SMA7022MU, SDK03M
1000
1200
RS =0.5
RS =0.8
RS =1
IOPD=
1+
RS
r1=510
r2=100
Vb=5V
1
·
Vb
r1(r2+rX)
r2 · rX


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