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TS2509 Arkusz danych(PDF) 4 Page - Taiwan Semiconductor Company, Ltd |
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TS2509 Arkusz danych(HTML) 4 Page - Taiwan Semiconductor Company, Ltd |
4 / 9 page TS2509 3A / 500KHz PWM Buck Converter 4/9 Version: A09 Function Descriptions PWM Control The TS2509 consists of DC/DC converters that employ a pulse-width modulation (PWM) system. In converters of the TS2509, the pulse width varies in a range from 0 to 100%, according to the load current. The ripple voltage produced by the switching can easily be removed through a filter because the switching frequency remains constant. Therefore, these converters provide a low-ripple power over broad ranges of input voltage and load current. Setting the Output Voltage Application circuit item shows the basic application circuit with TS2509 adjustable output version. The external resistor sets the output voltage according to the following equation: (EL CAP) Resistor select for output voltage setting (MLCC) Resistor select for output voltage setting VOUT R2 R1 VOUT R2 R1 5V 1.3K 6.8K 5V 7.5K 39K 3.3V 1.5K 4.7K 3.3V 15K 47K 2.5V 2.2K 4.7K 2.5V 22K 47K 1.8V 2K 2.5K 1.8V 27K 33K 1.5V 2.2K 2K 1.5V 30K 27K 1.2V 3K 1.5K 1.2V 30K 15K 1V 10K 2.5K 1V 56K 13K Inductor Selection For most designs, the operate with inductors of 10µH to 22µH. The inductor value can be derived from the following equation: L1 Recommend Value (VIN=12V, IOUT=3A) VOUT 1.8V 2.5V 3.3V 5V L1 Value 10~15uH 10~15uH 15~22uH 15~22uH Where is inductor Ripple Current. Large value inductors lower ripple current and small value inductors result in high ripple currents. Choose inductor ripple current approximately 15% of the maximum load current 3A, ΔIL=0.4A. The DC current rating of the inductor should be at least equal to the maximum load current plus half the ripple current to prevent core saturation (3A+0.2A). Input Capacitor Selection (EL CAP) This capacitor should be located close to the IC using short leads and the voltage rating should be approximately 1.5 times the maximum input voltage. The RMS current rating requirement for the input capacitor of a buck regulator is approximately 1⁄2 the DC load current. A low ESR input capacitor sized for maximum RMS current must be used. A 220µF low ESR capacitor for most applications is sufficient. (MLCC) A 22µF MLCC or two 10uF MLCC capacitors for most applications is sufficient. |
Podobny numer części - TS2509 |
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Podobny opis - TS2509 |
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