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参数资料
| 型号： | TC2576VAT |
| 元件分类： | 稳压器 |
| 英文描述： | 7.5 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSFM5 |
| 封装： | TO-220, 5 PIN |
| 文件页数： | 23/25页 |
| 文件大小： | 213K |
| 代理商： | TC2576VAT |
7
TC2576
TC2576-2 12/04/00
3.0A Step-Down Switching Regulator
2001 Microchip Technology Inc.
DS21399A
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, 12V or 15V)
VOUT = 5.0V
VIN(max) = Maximum Input Voltage
VIN (max) = 15V
ILOAD(max) = Maximum Load Current
ILOAD (max) = 3.0A
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
polarity and current value, use the TC2576–5
voltage version.
controller IC.
2. Input Capacitor Selection (CIN )
To prevent large voltage transients from appearing at the input
A 100
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 3.0A
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
TC2576 to be able to withstand a continuous output short.
B. The reverse voltage rating of the diode should be at least
B. Use a 20V 1N5820 Schottky diode, or any of the
1.25 times the maximum input voltage.
suggested fast recovery diodes shown in Table 1.
4. Inductor Selection (L1)
A. According to the required working conditions, select the
A. Use the inductor selection guide shown in Figure 37.
correct inductor value using the selection guide from
Figures 36 to 38.
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 15V line and 3.0A line is L100.
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 100
H. From Table 2,
manufacturers part numbers listed in Table 2. The designer
choose an inductor from any of the listed
must realize that the inductor current rating must be higher
manufacturers.
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 “APPLICATION HINTS” section of this datasheet.
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