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參數(shù)資料
| 型號(hào)： | 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)： | 23/25頁 |
| 文件大?。?/td> | 212K |
| 代理商： | TC2574-VOETR |
7
TC2574
0.5A Step-Down Switching Regulator
TC2574-1 1/6/00
Procedure (Fixed Output Voltage Version)
In order to simplify the switching regulator design, a step-by-step design procedure and examples are provided.
Procedure
Example
Given Parameters:
VOUT = Regulated Output Voltage (3.3V, 5.0V or 12V)
VOUT = 5.0 V
VIN(max) = Maximum Input Voltage
VIN (max) = 15 V
ILOAD(max) = Maximum Load Current
ILOAD (max) = 0.4 A
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
polarity and current value, use the TC2574–5
IC output voltage version.
controlller IC.
2. Input Capacitor Selection (CIN )
To prevent large voltage transients from appearing at the input
A 22
F, 25V aluminium electrolytic capacitor
tantalum electrolytic bypass capacitor is needed between the
located near to the input and ground pins provides input
pin +VIN and ground pin Gnd. This capacitor should be
sufficient bypassing.
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.
For a robust design the diode should have a current rating
equal to the maximum current limit of the TC2574 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 1N5817 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 38.
correct inductor value using the selection guide from
Figures 39 to 41.
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 0.4A line is 330.
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 330
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 “EXTERNAL COMPONENTS” section of this
data sheet.
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相關(guān)代理商/技術(shù)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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