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LM2575IKC Datasheet(PDF) 7 Page - Texas Instruments

Part # LM2575IKC
Description  1-A SIMPLE STEP DOWN SWITCHING VOLTAGE REGULATOR
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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LM2575IKC Datasheet(HTML) 7 Page - Texas Instruments

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APPLICATION INFORMATION
Layout Guidelines
LM2575-xx
Fixed Output
CIN
100
µF
+
+VIN
1
3
GND
5
D1
2
L1
330
µH
COUT
330
µF
+
4
L
O
A
D
VOUT
VIN
Unregulated
DC Input
CIN = 100 µF, Aluminum Electrolytic
COUT = 330 µF, Aluminum Electrolytic
D1 = Schottky
L1 = 330
µH
Fixed Output Voltage Versions
LM2575
(ADJ)
CIN
100
µF
+
+VIN
1
3
GND
5
ON/OFF
D1
11DQ06
OUTPUT
2
L1
330
µH
COUT
330
µF
+
FEEDBACK
4
L
O
A
D
VOUT
7-V to 60-V
Unregulated
DC Input
Adjustable Output Voltage Versions
VOUT = VREF(1 + R2/R1) = 5 V
Where,
VREF = 1.23 V
R1 = 2 kW
R2 = 6.12 kW
R2
R1
ON/OFF
OUTPUT
FEEDBACK
LM2575
1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATOR
SLVS569D – JANUARY 2005 – REVISED JULY 2005
With any switching regulator, circuit layout plays an important role in circuit performance. Wiring and parasitic
inductances, as well as stray capacitances, are subjected to rapidly switching currents, which can result in
unwanted voltage transients. To minimize inductance and ground loops, the length of the leads indicated by
heavy lines should be minimized. Optimal results can be achieved by single-point grounding (see Figure 2) or by
ground-plane construction. For the same reasons, the two programming resistors used in the adjustable version
should be located as close as possible to the regulator to keep the sensitive feedback wiring short.
A.
Pin numbers are for the KTT (TO-263) package.
Figure 2. Test Circuit and Layout Guidelines
7


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