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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

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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
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Copyright © 2010, Texas Instruments Incorporated
Product Folder Links: LM48580


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