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LM2574 データシート(PDF) 8 Page - ON Semiconductor

部品番号 LM2574
部品情報  0.5 A, Adjustable Output Voltage, Step?묭own 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

LM2574 データシート(HTML) 8 Page - ON Semiconductor

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LM2574, NCV2574
http://onsemi.com
8
Figure 16. Test Circuit and Layout Guidelines
D1
1N5819
L1
330
mH
Output
7
1
Feedback
Cout
220
mF
Cin
22
mF
LM2574
Fixed Output
1
3
4ON/OFF
Pwr
Gnd
Vin
Load
Vout
D1
1N5819
L1
330
mH
Output
7
1
Feedback
Cout
220
mF
Cin
22
mF
LM2574
Adjustable
1
Vin
Load
Vout
5.0 V
Fixed Output Voltage Versions
Adjustable Output Voltage Versions
Vout + Vref 1.0 )
R2
R1
R2
+ R1
Vout
V
ref
–1.0
Where Vref = 1.23 V, R1
between 1.0 k
W and 5.0 kW
R2
6.12 k
R1
2.0 k
7.0 − 40 V
Unregulated
DC Input
2
Sig
Gnd
3
4ON/OFF
Pwr
Gnd
2
Sig
Gnd
7.0 V − 40 V
Unregulated
DC Input
Cin
−22
mF, 60 V, Aluminium Electrolytic
Cout
220
mF, 25 V, Aluminium Electrolytic
D1
Schottky, 1N5819
L1
330
mH, (For 5.0 Vin, 3.3 Vout, use 100 mH)
R1
2.0 k, 0.1%
R2
6.12 k, 0.1%
NOTE: Pin numbers in ( ) are for the SO−16W package.
(12)
(3)
(6)
(4)
(5)
(14)
(12)
(3)
(14)
(6)
(4)
(5)
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 16, 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 7
(emitter of the internal switch) of the LM2574 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
LM2574 regulator.


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