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參數(shù)資料
| 型號： | TC2575-12.0VAT |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSFM5 |
| 封裝： | TO-220, 5 PIN |
| 文件頁數(shù)： | 24/26頁 |
| 文件大?。?/td> | 172K |
| 代理商： | TC2575-12.0VAT |
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7
TC2575
TC2575-1 3/13/00
1.0A Step-Down Switching Regulator
2001 Microchip Technology Inc.
DS21398A
Procedure (Fixed Output Voltage Version)
In order to simplify the switching regulator design, a step-by-step design procedure and some examples are provided.
Procedure
Example
Given Parameters:
VOUT = Regulated Output Voltage (3.3V, 5.0V or 12V)
VOUT = 5.0V
VIN(max) = Maximum DC Input Voltage
VIN (max) = 20V
ILOAD(max) = Maximum Load Current
ILOAD (max) = 0.8A
1. Controller IC Selection
According to the required input voltage, output voltage and
According to the required input voltage, output voltage,
current select the appropriate type of the controller IC output
current polarity and current value, use the TC2575 (5V)
voltage version.
controller IC.
2. Input Capacitor Selection (CIN )
To prevent large voltage transients from appearing at the input
A 47
F, 25V aluminium electrolytic capacitor
and for stable operation of the converter, an aluminum or tantalum
located near to the input and ground pins provides
electrolytic bypass capacitor is needed between the input pin +VIN
sufficient bypassing.
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.
3. Catch Diode Selection (D1)
A. Since the diode maximum peak current exceeds the
A. For this example the current rating of the diode is 1.0A
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
TC2575 to be able to withstand a continuous output short.
B. The reverse voltage rating of the diode should be at least
B. Use a 30V 1N5818 Schottky diode, or any of the
1.25 times the maximum input voltage.
suggested fast recovery diodes shown in Table 4.
4. Inductor Selection (L1)
A. According to the required working conditions, select the
A. Use the inductor selection guide shown in Figure 32
correct inductor value using the selection guide from
to 36.
Figures 32 to 36.
B. From the appropriate inductor selection guide, identify the
B. From the selection guide, the inductance area
inductance region intersected by the Maximum Input Voltage
intersected by the 20V line and 0.8A line is L300.
line and the Maximum Load Current line. Each region is
identified by an inductance value and an inductor code.
C. Select an appropriate inductor from the several different
C. Inductor value required is 300
H. From Table 1, or
manufacturers part numbers listed in Table 1 or Table 2
Table 2, choose an inductor from any of the listed
When using Table 2 for selecting the right inductor, the
manufacturers.
designer must realize that the inductor current rating must
be higher than the maximum peak current flowing through the
inductor. This maximum peak current can be calculated as
follows:
IP(max) = ILOAD (max)+
(VIN – VOUT ) tON
2L
where tON is the "on" time of the power switch and
tON =
VOUT
x
1.0
VIN
fOSC
For additional information about the inductor, see the inductor
section in the “EXTERNAL COMPONENTS” section of this
data sheet.
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