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參數(shù)資料
| 型號： | TC2574-VOETR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | WIDE, SOIC-16 |
| 文件頁數(shù)： | 25/25頁 |
| 文件大小： | 212K |
| 代理商： | TC2574-VOETR |
9
TC2574
0.5A Step-Down Switching Regulator
TC2574-1 1/6/00
Procedure (Adjustable Output Version): (TC2574-ADJ) (Continued)
Procedure
Example
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 TC2574 to be able to with stand a
continuous output short.
B. The reverse voltage rating of the diode should be at least
1.25 times the maximum input voltage.
4. Inductor Selection (L1)
A. Use the following formula to calculate the inductor
Volt x microsecond [V x
s] constant:
E x T = ( VIN – VOUT)
VOUT
x
10
6
[V x
sec]
VIN
F[Hz]
B. Match the calculated E x T value with the corresponding
number on the vertical axis of the Inductor Value
Selection Guide shown in Figure 39. This E x T constant
is a measure of the energy handling capability of an
inductor and is dependent upon the type of core, the core
area, the number of turns, and the duty cycle.
C. Next step is to identify the inductance region intersected
by the E x T value and the maximum load current value
on the horizontal axis shown in Figure 8.
D. From the inductor code, identify the inductor value. Then
select an appropriate inductor from Table 2. The inductor
chosen must be rated for a switching frequency of 52kHz
and for a current rating of 1.15 x ILOAD . The inductor
current rating can also be determined by calculating the
inductor peak current:
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.
3. Catch Diode Selection (D1)
A. For this example, a 1.0A current rating is adequate.
B. Use a 50V MBR150 Schottky diode or any suggested
fast recovery diodes in Table 1.
4. Inductor Selection (L1)
A. Calculate E x T [V x
sec] constant:
E x T = (40 – 24) x
24
x
1000
= 105[V x
sec]
40
52
B. E x T = 185 [V x
sec]
C. ILOAD(max) = 0.4 A
Inductance Region = 1000
D. Proper inductor value = 1000
H
Choose the inductor from Table 2.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TC2574VPA | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| TC2574-VPA | 制造商:TELCOM 制造商全稱:TelCom Semiconductor, Inc 功能描述:0.5A Step-Down Switching Regulator |
| TC2575 | 制造商:TELCOM 制造商全稱:TelCom Semiconductor, Inc 功能描述:1.0A Step-Down Switching Regulator |
| TC2575-12.0VAT | 制造商:TELCOM 制造商全稱:TelCom Semiconductor, Inc 功能描述:1.0A Step-Down Switching Regulator |
| TC2575-3.3VAT | 制造商:TELCOM 制造商全稱:TelCom Semiconductor, Inc 功能描述:1.0A Step-Down Switching Regulator |
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