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LM48580 bảng dữ liệu(PDF) 10 Page - Texas Instruments |
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LM48580 bảng dữ liệu(HTML) 10 Page - Texas Instruments |
10 / 21 page IN- IN+ LM48580 SINGLE-ENDED INPUT LM48580 SNAS491 – FEBRUARY 2010 www.ti.com GAIN SETTING The LM48580 features three internally configured gain settings 18, 24, and 30dB. The device gain is selected through a single pin (GAIN). The gain settings are shown in Table 2. Table 2. Gain Setting Gain Gain Setting FLOAT 18dB GND 24dB VDD 30dB SHUTDOWN FUNCTION The LM48580 features a low current shutdown mode. Set SD = GND to disable the amplifier and boost converter and reduce supply current to 0.01µA. SINGLE-ENDED INPUT CONFIGURATION The LM48580 is compatible with single-ended sources. When configured for single-ended inputs, input capacitors must be used to block and DC component at the input of the device. Figure 5 shows the typical single-ended applications circuit. Figure 8. Single-Ended Configuration PROPER SELECTION OF EXTERNAL COMPONENTS Boost Converter Capacitor Selection The LM48580 boost converter requires three external capacitors for proper operation: a 1 μF supply bypass capacitor, and 1 μF + 100pF output reservoir capacitors. Place the supply bypass capacitor as close to VDD as possible. Place the reservoir capacitors as close to VBST and VAMP as possible. Low ESR surface-mount multi- layer ceramic capacitors with X7R or X5R temperature characteristics are recommended. Select output capacitors with voltage rating of 25V or higher. Tantalum, OS-CON and aluminum electrolytic capacitors are not recommended. See Table 4 for suggested capacitor manufacturers. BOOST CONVERTER OUTPUT CAPACITOR SELECTION Inductor Selection The LM48580 boost converter is designed for use with a 4.7 μH inductor. Table 3 lists various inductors and their manufacturers. Choose an inductor with a saturation current rating greater than the maximum operating peak current of the LM48580 (> 1A). This ensures that the inductor does not saturate, preventing excess efficiency loss, over heating and possible damage to the inductor. Additionally, choose an inductor with the lowest possible DCR (series resistance) to further minimize efficiency losses. Table 3. Recommended Inductors MANUFACTURER PART# INDUCTANCE/ISAT Taiyo Yuden BRL3225T4R7M 4.7µH/1.1A 10 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Links: LM48580 |
Số phần tương tự - LM48580_14 |
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Mô tả tương tự - LM48580_14 |
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