參數(shù)資料
型號(hào)： LM2577M-12
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： Pressure Transducer, Series 19 mm, Compensated, Pressure Range: 0 psi to 50 psi, Gage, 1/8-27 NPT, 10 Vdc excitation
中文描述： 6 A SWITCHING REGULATOR, 62 kHz SWITCHING FREQ-MAX, PDSO24
封裝： 0.300 INCH, SO-24
文件頁(yè)數(shù)： 21/27頁(yè)
文件大?。?/td> 889K
代理商： LM2577M-12
Application Hints
(Continued)
Transformer
Input
Dual
Maxi-
mum
Output
Current
325 mA
275 mA
225 mA
700 mA
575 mA
500 mA
800 mA
700 mA
575 mA
900 mA
825 mA
700 mA
Type
Voltage
Output
Voltage
±
10V
±
12V
±
15V
±
10V
±
12V
±
15V
±
10V
±
12V
±
15V
±
10V
±
12V
±
15V
L
P
= 100 μH
N = 1
5V
5V
5V
10V
10V
10V
12V
12V
12V
15V
15V
15V
1
2
L
P
= 200 μH
N = 0.5
3
L
P
= 250 μH
N = 0.5
In addition to this bypass cap, a larger capacitor (
≥
47 μF)
should be used where the flyback transformer connects to
the input supply. This will attenuate noise which may inter-
fere with other circuits connected to the same input supply
voltage.
6. Snubber Circuit
A “snubber” circuit is required when operating from input
voltages greater than 10V, or when using a transformer with
L
≥
200 μH. This circuit clamps a voltage spike from the
transformer primary that occurs immediately after the output
switch turns off. Without it, the switch voltage may exceed
the 65V maximum rating. As shown in Figure 21 the snub-
ber consists of a fast recovery diode, and a parallel RC. The
RC values are selected for switch clamp voltage (V
)
that is 5V to 10V greater than V
SW(OFF)
. Use the following
equations to calculate R and C;
Power dissipation (and power rating) of the resistor is;
The fast recovery diode must have a reverse voltage rating
greater than V
CLAMP
.
FLYBACK REGULATOR CIRCUIT EXAMPLE
The circuit of Figure 22 produces
±
15V (at 225 mA each)
from a single 5V input. The output regulation of this circuit is
shown in Figure 23 and Figure 25 while the load transient
response is shown in Figure 24 and Figure 26 Switching
waveforms seen in this circuit are shown in Figure 27
Transformer
Type
1
2
3
Manufacturers’ Part Numbers
AIE
Pulse
326-0637
PE-65300
330-0202
PE-65301
330-0203
PE-65302
Renco
RL-2580
RL-2581
RL-2582
FIGURE 20. Flyback Transformer Selection Guide
DS011468-19
FIGURE 21. Snubber Circuit
www.national.com
21
相關(guān)PDF資料
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LM2585SX-12 SIMPLE SWITCHER 3A Flyback Regulator
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM2577M-12/NOPB 制造商:Texas Instruments 功能描述:Conv DC-DC Single Step Up 3.5V to 40V 24-Pin SOIC W Rail
LM2577M-15 功能描述:IC REG MULTI CONFIG 15V 24-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:SIMPLE SWITCHER® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3.3V 輸入電壓:4.5 V ~ 24 V PWM 型:- 頻率 - 開(kāi)關(guān):- 電流 - 輸出:125mA 同步整流器:無(wú) 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 包裝:Digi-Reel® 供應(yīng)商設(shè)備封裝:SOT-6 其它名稱:MAX1836EUT33#TG16DKR
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LM2577M-ADJ/NOPB 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
LM2577MX-12 功能描述:IC REG MULTI CONFIG 12V 24SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:SIMPLE SWITCHER® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3.3V 輸入電壓:4.5 V ~ 24 V PWM 型:- 頻率 - 開(kāi)關(guān):- 電流 - 輸出:125mA 同步整流器:無(wú) 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 包裝:Digi-Reel® 供應(yīng)商設(shè)備封裝:SOT-6 其它名稱:MAX1836EUT33#TG16DKR
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