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LM2575TV-5G データシート(PDF) 7 Page - ON Semiconductor

部品番号 LM2575TV-5G
部品情報  1.0 A, Adjustable Output Voltage, Step-Down Switching Regulator
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メーカー  ONSEMI [ON Semiconductor]
ホームページ  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

LM2575TV-5G データシート(HTML) 7 Page - ON Semiconductor

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LM2575
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7
Figure 14. Typical Test Circuit
D1
1N5819
L1
330
mH
Output
2
4
Feedback
Cout
330
mF
/16 V
Cin
100
mF/50 V
LM2575−5
1
5
3ON/OFF
GND
Vin
Load
Vout
Regulated
Output
Vin
Unregulated
DC Input
8.0 V − 40 V
D1
1N5819
L1
330
mH
Output
2
4
Feedback
Cout
330
mF
/16 V
Cin
100
mF/50 V
LM2575
Adjustable
1
5
3ON/OFF
GND
Vin
Load
Vout
Regulated
Output
Unregulated
DC Input
8.0 V − 40 V
5.0 Output Voltage Versions
Adjustable Output Voltage Versions
Vout + Vref 1 )
R2
R1
R2
+ R1
Vout
V
ref
–1
Where Vref = 1.23 V, R1
between 1.0 k
W and 5.0 kW
R2
R1
+
+
PCB LAYOUT GUIDELINES
As in any switching regulator, the layout of the printed
circuit board is very important. Rapidly switching currents
associated with wiring inductance, stray capacitance and
parasitic inductance of the printed circuit board traces can
generate
voltage
transients
which
can
generate
electromagnetic interferences (EMI) and affect the desired
operation. As indicated in the Figure 14, to minimize
inductance and ground loops, the length of the leads
indicated by heavy lines should be kept as short as possible.
For best results, single−point grounding (as indicated) or
ground plane construction should be used.
On the other hand, the PCB area connected to the Pin 2
(emitter of the internal switch) of the LM2575 should be
kept to a minimum in order to minimize coupling to sensitive
circuitry.
Another sensitive part of the circuit is the feedback. It is
important to keep the sensitive feedback wiring short. To
assure this, physically locate the programming resistors near
to the regulator, when using the adjustable version of the
LM2575 regulator.


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