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LM2575 Datasheet(PDF) 5 Page - Texas Instruments

Part No. LM2575
Description  1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATOR
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM2575 Datasheet(HTML) 5 Page - Texas Instruments

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APPLICATION INFORMATION
Layout Guidelines
LM2575
(ADJ)
CIN
100
µF
+
+VIN
16
5, 12, 13
GND
9 ON/OFF
D1
11DQ06
OUTPUT
3
L1
330
µH
COUT
330
µF
+
FEEDBACK
7
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
Input Capacitor (C
IN)
I
C,RMS
u 1.2(
ton
T
) I
LOAD, where:
ton
T
+
V
OUT
V
IN
{buck regulator}, and
ton
T
+
|V
OUT|
(|V
OUT| ) VIN)
{buck−boost regulator}
Output Capacitor (C
OUT)
LM2575
1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATOR
SLVS569E – JANUARY 2005 – REVISED JANUARY 2006
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 (see Figure 1) should be minimized. Optimal results can be achieved by single-point grounding 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.
Figure 1. Test Circuit and Layout Guidelines
For stability concerns, an input bypass capacitor (electrolytic, CIN ≥ 47 µF) needs to be located as close as
possible to the regulator. For operating temperatures below –25
°C, C
IN may need to be larger in value. In
addition, since most electrolytic capacitors have decreasing capacitances and increasing ESR as temperature
drops, adding a ceramic or solid tantalum capacitor in parallel increases the stability in cold temperatures.
To extend the capacitor operating lifetime, the capacitor RMS ripple current rating should be:
For both loop stability and filtering of ripple voltage, an output capacitor also is required, again in close proximity
to the regulator. For best performance, low-ESR aluminum electrolytics are recommended, although standard
aluminum electrolytics may be adequate for some applications. Based on the following equation:
Output Ripple Voltage = (ESR of COUT) × (inductor ripple current)
5


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