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TS3552 データシート(PDF) 5 Page - Taiwan Semiconductor Company, Ltd

部品番号 TS3552
部品情報  2A/350kHz Synchronous Buck DC/DC Converter
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メーカー  TSC [Taiwan Semiconductor Company, Ltd]
ホームページ  http://www.taiwansemi.com
Logo TSC - Taiwan Semiconductor Company, Ltd

TS3552 データシート(HTML) 5 Page - Taiwan Semiconductor Company, Ltd

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TS3552
2A/350kHz Synchronous Buck DC/DC Converter
5/11
Version: B11
Application Information
Setting Output Voltage
The output voltage is set using a resistive divider from the output to FB. The FB pin regulated voltage is 0.925V.
Thus the output voltage is:
R2 recommended value is 10K ~30K , so R1 is determined by: R1 = 10.81 x (VOUT – 0.925) K
Recommended Component Selection
VIN (V)
VOUT (V)
R1 (K )
R2 (K )
R3 (K )
C3 (nF)
L1 (µH)
COUT (µF)
12
5
44.1
10
2.2
3.3
15
22 X 1
5 or 12
3.3
25.7
10
2.2
3.3
10
22 X 1
5 or 12
1.8
9.5
10
2.2
3.3
4.7
22 X 1
5 or 12
1.2
3
10
2.2
3.3
3.3
22 X 1
5 or 12
1
0.81
10
2.2
3.3
2.2
22 X 1
Selecting Inductor
The inductor selection depends on the current ripple of inductor, the input voltage and the output voltage.
Accepting a large current ripple of inductor allows the use of a smaller inductance. However, higher current ripple
of inductor can cause higher output ripple voltage and large core loss. By setting an acceptable current ripple of
inductor, a suitable inductance can be obtained from above formula.
In addition, it is important to ensure the inductor saturation current exceeds the peak value of inductor current in
application to prevent core saturation. The peak value of inductor current can be calculated according to the
following formula.
Soft-Start
The TS3552 provides the soft-start function. Initially, the voltage at SS pin is 0V. Then an internal current source of
6
A (typ.) charges an external soft
-start capacitor. During the soft-start period, the voltage at SS pin will limit the
feedback threshold voltage at FB pin. When the voltage at SS pin is higher than 0.925V, the feedback threshold
voltage at FB pin reaches the desired value. The soft-start time can be calculated in accordance with the following
formula:
The soft-start capacitor is discharged to GND when the EN pin is connected to GND


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