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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AS3515 датащи(PDF) 41 Page - ams AG |
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AS3515 датащи(HTML) 41 Page - ams AG |
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41 / 67 page  AS3515 V15 austriamicrosystems Data Sheet, Confidential www.austriamicrosystems.com Revision 3.1 40 - 66 6.14 15V Step-Up Converter 6.14.1 General The integrated Step-Up DC/DC Converter is a high efficiency current-mode PWM regulator, providing an output voltage up to 15V. A constant switching-frequency results in a low noise on supply and output voltages. It has an adjustable sink current (1.25 to 38.75mA) to provide e.g. dimming function when driving white LEDs as back-light. Figure 16 15V Step-Up converter Block Diagram BVDD 0.83V 1.33V Σ PWM-LOGIC DRIVER Ramp Generatio n ISINK VSS15 SW15 NMOS 15V Power Device 0.85 Ω typ. Current Sense Pulse-Skip Comparator Error Amplifier Clock Generation VSS VSS15 1.25 - 37.5 mA 6.14.2 Parameter Table 41 15V Step-Up Converter Parameter Symbol Parameter Notes Min Typ Max Unit VSW High Voltage Pin Pin SW15 0 15 V IVDD Quiescent Current Pulse Skipping mode 140 µA VFB Feedback Voltage, Transient Pin ISINK 0 5.5 V VFB Feedback Voltage, during Regulation Pin ISINK 0.83 V ISW_MAX Current Limit V15_ON = 1 510 mA RSW Switch Resistance V15_ON = 0 0.85 Ω ILOAD Load Current @ 15V output voltage 0 38.75 mA VPULSESKIP Pulse-skip Threshold Voltage at pin ISINK, pulse skips are introduces when load current becomes too low. 1.33 V FIN Fixed Switching Frequency 0.6 MHz COUT Output Capacitor Ceramic 1 µF L (Inductor) ILOAD > 20mA Use inductors with small CPARASITIC (<100pF) for high efficency 17 22 27 µH ILOAD < 20mA 8 10 27 |
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