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LM2840-Q1 データシート(PDF) 6 Page - Texas Instruments

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部品番号 LM2840-Q1
部品情報  Input Step-Down DC/DC Regulator in Thin SOT
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
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LM2840-Q1 データシート(HTML) 6 Page - Texas Instruments

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1.1
1.7
2.3
2.8
3.4
4.0
SHDN PIN VOLTAGE (V)
1.2
1.0
0.9
0.7
0.6
0.4
LM2841, LM2842
SNVS540H – MARCH 2009 – REVISED APRIL 2013
www.ti.com
Typical Performance Characteristics (continued)
Switch Current Limit vs. SHDN Pin Voltage
(Soft-start Implementation, LM2842)
SHDN Pin Current vs. SHDN Pin Voltage
Figure 8.
Figure 9.
Switching Node and Output Voltage Waveforms
Load Transient Waveforms
VIN = 12V, VOUT = 3.3V, IOUT = 200 mA
VIN = 12V, VOUT = 3.3V, IOUT = 300 mA to 200 mA to 300 mA
Top trace: VOUT, 10 mV/div, AC Coupled
Top trace: VOUT, 20 mV/div, AC Coupled
Bottom trace: SW, 5V/div, DC Coupled
Bottom trace: IOUT, 100 mA/div, DC Coupled
T = 1 µs/div
T = 200 µs/div
Figure 10.
Figure 11.
Start-up Waveform
VIN = 12V, VOUT = 3.3V, IOUT = 50 mA
Top trace: VOUT, 1V/div, DC Coupled
Bottom trace: SHDN, 2V/div, DC Coupled
T = 40 µs/div
Figure 12.
6
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