- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄376111 > LM2576-ADJ (Motorola, Inc.) Easy Switcher 3.0A Step-Down Voltage Regulator PDF資料下載
參數(shù)資料
| 型號： | LM2576-ADJ |
| 廠商： | Motorola, Inc. |
| 英文描述： | Easy Switcher 3.0A Step-Down Voltage Regulator |
| 中文描述： | 輕松切換3.0A的降壓穩(wěn)壓器 |
| 文件頁數(shù)： | 12/28頁 |
| 文件大小： | 301K |
| 代理商： | LM2576-ADJ |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁當(dāng)前第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁
LM2576
12
MOTOROLA ANALOG IC DEVICE DATA
Procedure (Adjustable Output Version: LM2576–ADJ) (continued)
Procedure
Example
4. Inductor Selection (L1)
A.
Use the following formula to calculate the inductor Volt x
microsecond [V x
μ
s] constant:
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 22. 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 25.
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 52 kHz and for a current rating of 1.15 x Load.
The inductor current rating can also be determined by
calculating the inductor peak current:
where ton is the “on” time of the power switch and
For additional information about the inductor, see the
inductor section in the “External Components” section of
this data sheet.
E x T
Vin– Vout
Vout
Vin
x
106
F[Hz][V x
s]
Ip(max)
ILoad(max)
Vin– Voutton
2L
ton
Vout
Vin
x1.0
fosc
4. Inductor Selection (L1)
A.
Calculate E x T [V x
μ
s] constant:
B.
E x T = 80 [V x
μ
s]
C.
ILoad(max) = 2.5 A
Inductance Region = H150
D.
Proper inductor value = 150
μ
H
Choose the inductor from Table 2.
E x T
(25 – 8.0) x25
x152
80 [V x
s]
5. Output Capacitor Selection (Cout)
A.
Since the LM2576 is a forward–mode switching regulator
with voltage mode control, its open loop 2–pole–1–zero
frequency characteristic has the dominant pole–pair
determined by the output capacitor and inductor values
.
For stable operation, the capacitor must satisfy the
following requirement:
B.
Capacitor values between 10
μ
F and 2000
μ
F will satisfy
the loop requirements for stable operation. To achieve an
acceptable output ripple voltage and transient response, the
output capacitor may need to be several times larger than
the above formula yields.
C.
Due to the fact that the higher voltage electrolytic capacitors
generally have lower ESR (Equivalent Series Resistance)
numbers, the output capacitor’s voltage rating should be at
least 1.5 times greater than the output voltage. For a 5.0 V
regulator, a rating of at least 8.0 V is appropriate, and a 10 V
or 16 V rating is recommended.
Cout
13,300
Vin(max)
Voutx L [
μ
H][
μ
F]
5. Output Capacitor Selection (Cout)
A.
Cout
To achieve an acceptable ripple voltage, select
Cout = 680
μ
F electrolytic capacitor.
13,300 x
25
8 x 150
332.5
μ
F
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM2904V | LinCMOS<TM> Precision Dual Operational Amplifier 8-PDIP -40 to 85 |
| LM29021 | Amplifiers and Comparators |
| LM2902V | LinCMOS(TM) Programmable Low-Power Operational Amplifier 8-PDIP -40 to 85 |
| LM2935D2T | Octal Edge-Triggered D-Type Flip-Flops With 3-State Outputs 20-TSSOP -40 to 85 |
| LM2935T | Octal Edge-Triggered D-Type Flip-Flops With 3-State Outputs 20-TSSOP -40 to 85 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2576BM | 制造商:TGS 制造商全稱:Tiger Electronic Co.,Ltd 功能描述:3A Step-Down Voltage Regulator |
| LM2576BT | 功能描述:IC REG BUCK ADJ 3A TO220-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關(guān):52kHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
| LM2576BU | 功能描述:IC REG BUCK ADJ 3A TO263-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關(guān):52kHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
| LM2576BU TR | 功能描述:IC REG BUCK ADJ 3A TO263-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關(guān):52kHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
| LM2576D2T-005 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 5V 3A Buck PWM RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。