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TS3553CS-RLG Scheda tecnica(PDF) 6 Page - Taiwan Semiconductor Company, Ltd

Il numero della parte TS3553CS-RLG
Spiegazioni elettronici  3A/350kHz Synchronous Buck DC/DC Converter
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Produttore elettronici  TSC [Taiwan Semiconductor Company, Ltd]
Homepage  http://www.taiwansemi.com
Logo TSC - Taiwan Semiconductor Company, Ltd

TS3553CS-RLG Scheda tecnica(HTML) 6 Page - Taiwan Semiconductor Company, Ltd

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TS3553
3A/350kHz Synchronous Buck DC/DC Converter
6/11
Version: B11
Application Information (Continue)
Optional Schottky Diode
A Schottky diode with low forward drop voltage and fast reverse recovery is the ideal choice for better efficiency.
The forward drop voltage of a Schottky diode will result in the conduction losses in the diode, and the diode
capacitance (CT or CD) will cause the switching losses. Therefore, it is necessary to consider both forward voltage
drop and diode capacitance for diode selection. In addition, the rating of selected Schottky diode should be able to
handle the input voltage and the maximum peak diode current.
Input Capacitor the Output Capacitor
To prevent the high input voltage ripple and noise resulted from high frequency switching, the use of low ESR
ceramic capacitor for the maximum RMS current is recommended. The approximated RMS current of the input
capacitor can be calculated according to the following formula.
The selection of output capacitor depends on the required output voltage ripple. The output voltage ripple can be
expressed as:
For lower output voltage ripple, the use of low ESR ceramic capacitor is recommended. The tantalum capacitor can
also be used well, but its ERS is larger than that of ceramic capacitor.
When choosing the input and output ceramic capacitors, X5R and X7R types are recommended because they
retain their capacitance over wider ranges of voltage and temperature than other types.
Loop Compensation
In order to avoid the poor output voltage ripple and low efficiency caused by instability, TS3553 requires a proper
external compensation network to compensate its feedback loop. In this external compensation network, the
compensation resistor, RC, and the compensation capacitor, CC, are used to set the high-frequency integrator gain
and the integrator zero. C7 is used to cancel the zero caused by the output capacitor and it’s ESR. While using the
ceramic capacitor as the output capacitor, C7 can be omitted due to the small ESR.
The system has one pole of importance, due to the output capacitor, C3//C4 and the load resistor. This poles is
located at:


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