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LM2594DADJR2G датащи(PDF) 9 Page - ON Semiconductor

номер детали LM2594DADJR2G
подробное описание детали  0.5 A, Step-Down Switching Regulator
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производитель  ONSEMI [ON Semiconductor]
домашняя страница  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

LM2594DADJR2G датащи(HTML) 9 Page - ON Semiconductor

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9
PROCEDURE (ADJUSTABLE OUTPUT VERSION: LM2594)
Procedure
Example
Given Parameters:
Vout = Regulated Output Voltage
Vin(max) = Maximum DC Input Voltage
ILoad(max) = Maximum Load Current
Given Parameters:
Vout = 5.0 V
Vin(max) = 12 V
ILoad(max) = 0.5 A
1. Programming Output Voltage
To select the right programming resistor R1 and R2 value (see
Figure 1) use the following formula:
Resistor R1 can be between 1.0 k and 5.0 kW. (For best
temperature coefficient and stability with time, use 1% metal
film resistors).
Vout + Vref 1.0 )
R2
R1
R2 + R1
Vout
Vref
* 1.0
where Vref = 1.23 V
1. Programming Output Voltage (selecting R1 and R2)
Select R1 and R2:
R2 = 3.0 kW, choose a 3.0k metal film resistor.
R2 + R1
Vout
Vref
* 1.0 +
5V
1.23 V *
1.0
Vout + 1.23 1.0 )
R2
R1
Select R1 = 1.0 kW
2. Input Capacitor Selection (Cin)
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 +Vin 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.
2. Input Capacitor Selection (Cin)
A 68 mF, 50 V aluminium electrolytic capacitor located near
the input and ground pin provides sufficient bypassing.
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
load current. For a robust design, the diode should have a
current rating equal to the maximum current limit of the
LM2594 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.
3. Catch Diode Selection (D1)
A. For this example, a 1.0 A current rating is adequate.
B. For Vin = 12 V use a 20 V 1N5817 Schottky diode or
any suggested fast recovery diode in the Table 2.


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