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LM2576 Datasheet(PDF) 21 Page - Motorola, Inc

Part # LM2576
Description  Easy Switcher 3.0A Step-Down Voltage Regulator
PDF  28 Pages
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Manufacturer  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

LM2576 Datasheet(HTML) 21 Page - Motorola, Inc

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LM2576
21
MOTOROLA ANALOG IC DEVICE DATA
predetermined threshold level with respect to the ground
Pin 3, which is determined by the following expression:
V
th [
V
Z1 )
1.0
) R2
R1
V
BE
(Q1)
Figure 32. Undervoltage Lockout Circuit for
Buck Converter
R2
10 k
Z1
1N5242B
R1
10 k
Q1
2N3904
R3
47 k
Vth ≈ 13 V
Cin
100
µF
LM2576–XX
1
3
5
Gnd
ON/OFF
+Vin
+Vin
NOTE: This picture does not show the complete circuit.
The following formula is used to obtain the peak inductor
current:
where ton +
|V
O
|
V
in )
|V
O
|
x
1.0
fosc
, and fosc + 52 kHz.
I
peak [
I
Load
(V
in )
|V
O
|)
V
in
)
V
in
xton
2L
1
Under normal continuous inductor current operating
conditions, the worst case occurs when Vin is minimal.
Figure 33. Undervoltage Lockout Circuit for
Buck–Boost Converter
R2
15 k
Z1
1N5242B
R1
15 k
Q1
2N3904
R3
47 k
Vth ≈ 13 V
Cin
100
µF
LM2576–XX
1
3
5
Gnd
ON/OFF
+Vin
+Vin
Vout
NOTE: This picture does not show the complete circuit.
Adjustable Output, Low–Ripple Power Supply
A 3.0 A output current capability power supply that
features an adjustable output voltage is shown in Figure 34.
This regulator delivers 3.0 A into 1.2 V to 35 V output. The
input voltage ranges from roughly 3.0 V to 40 V. In order to
achieve a 10 or more times reduction of output ripple, an
additional L–C filter is included in this circuit.
Figure 34. 1.2 to 35 V Adjustable 3.0 A Power Supply with Low Output Ripple
D1
1N5822
L1
150
µH
Output
2
4
Feedback
R2
50 k
R1
1.21 k
L2
20
µH
Output
Voltage
1.2 to 35 V @ 3.0 A
Optional Output
Ripple Filter
40 V Max
Unregulated
DC Input
Cout
2200
µF
C1
100
µF
Cin
100
µF
LM2574–Adj
1
5
3ON/OFF
Gnd
+Vin



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