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LM2595
PROCEDURE (ADJUSTABLE OUTPUT VERSION: LM2595)
Procedure
Given Parameters:
V out = Regulated Output Voltage
V in(max) = Maximum DC Input Voltage
I Load(max) = Maximum Load Current
1. Programming Output Voltage
To select the right programming resistor R1 and R2 value (see
Example
Given Parameters:
V out = 5.0 V
V in(max) = 12 V
I Load(max) = 1.0 A
1. Programming Output Voltage (selecting R1 and R2)
Select R1 and R2:
1.0 )
V out + V
where V ref = 1.23 V
V out + 1.23 1.0 )
V out
R2 + R1 * 1.0
ref
+ * 1.0
Figure 1) use the following formula:
R2
ref R1
Resistor R1 can be between 1.0 k and 5.0 k W . (For best
temperature coefficient and stability with time, use 1% metal
V
R2
R1
Select R1 = 1.0 k W
5V
1.23 V
film resistors).
R2 + R1
V out
V ref
* 1.0
R2 = 3.07 k W , choose a 3.0k metal film resistor.
2. Input Capacitor Selection (C in )
To prevent large voltage transients from appearing at the input
and for stable operation of the converter, an aluminium or
tantalum electrolytic bypass capacitor is needed between the
input pin +V in and ground pin GND This capacitor should be
located close to the IC using short leads. This capacitor should
have a low ESR (Equivalent Series Resistance) value .
For additional information see input capacitor section in the
“Application Information” section of this data sheet.
3. Catch Diode Selection (D1)
A. Since the diode maximum peak current exceeds the
regulator maximum load current the catch diode current
rating must be at least 1.2 times greater than the maximum
2. Input Capacitor Selection (C in )
A 220 m F, 50 V aluminium electrolytic capacitor located near
the input and ground pin provides sufficient bypassing.
3. Catch Diode Selection (D1)
A. For this example, a 1.0 A (for a robust design 3.0 A diode
is recommended) current rating is
adequate.
load current. For a robust design, the diode should have a
current rating equal to the maximum current limit of the
LM2595 to be able to withstand a continuous output short.
B. The reverse voltage rating of the diode should be at least
1.25 times the maximum input voltage.
B. For V in = 12 V use a 20 V 1N5817 (1N5820) Schottky
diode or any suggested fast recovery diode in the Table 2.
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