參數(shù)資料
型號(hào)： LM2577S-12X
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： 6 A SWITCHING REGULATOR, 62 kHz SWITCHING FREQ-MAX, PSSO5
封裝： PLASTIC, TO-263, SMT-5
文件頁(yè)數(shù)： 17/31頁(yè)
文件大?。?/td> 1406K
代理商： LM2577S-12X
Application Hints (Continued)
step-up regulator, and this requires a larger bypass capacitor
to decouple the LM1577/LM2577 V
IN pin from this noise. For
most applications, a low ESR, 1.0 F cap will be sufficient, if
it is connected very close to the V
IN and Ground pins.
Transformer
Input
Dual
Maximum
Type
Voltage
Output
Voltage
Current
L
P = 100 H
5V
±10V
325 mA
1
N=1
5V
±12V
275 mA
5V
±15V
225 mA
10V
±10V
700 mA
10V
±12V
575 mA
2L
P = 200 H
10V
±15V
500 mA
N = 0.5
12V
±10V
800 mA
12V
±12V
700 mA
12V
±15V
575 mA
3L
P = 250 H
15V
±10V
900 mA
N = 0.5
15V
±12V
825 mA
15V
±15V
700 mA
In addition to this bypass cap, a larger capacitor (
≥ 47 F)
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
P
≥ 200 H. 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
CLAMP)
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
Manufacturers’ Part Numbers
Type
AIE
Pulse
Renco
1
326-0637
PE-65300
RL-2580
2
330-0202
PE-65301
RL-2581
3
330-0203
PE-65302
RL-2582
FIGURE 20. Flyback Transformer Selection Guide
01146819
FIGURE 21. Snubber Circuit
LM1577/LM2577
www.national.com
24
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM2577S-15 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:SIMPLE SWITCHER-R Step-Up Voltage Regulator
LM2577S-15/NOPB 功能描述:IC REG MULTI CONFIG 15V TO263-5 RoHS:是 類(lèi)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(lèi)型:降壓（降壓） 輸出類(lèi)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(lèi)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(chēng):MAX1836EUT33#TG16DKR
LM2577S-15/NOPB 制造商:Texas Instruments 功能描述:DC/DC Converter IC
LM2577S-ADJ 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
LM2577S-ADJ/NOPB 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 STEP-UP VLTG REG 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
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