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A8285 Datasheet(PDF) 2 Page - Allegro MicroSystems |
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A8285 Datasheet(HTML) 2 Page - Allegro MicroSystems |
2 / 17 page 2 Worcester, Massachusetts 01615-0036 (508) 853-5000 115 Northeast Cutoff, Box 15036 www.allegromicro.com A8285/A8287 LNB Supply and Control Voltage Regulator Functional Block Diagram 22 kHz Tone Detector Internal Regulator Boost Converter Charge Pump Clock Divider 22 kHz Tone Generator I C Interface 2 Output Voltage Select Fault Monitor Overcurrent TSD Undervoltage VREG BOOST Feedback 33 µH 33 µF EXTM V IN SDA SCL ADD IRQ 100 mV VIN LX 100 nF VCP BOOST OSC In DISABLE 100 nF LNB 220 Ω 6.8 nF 33 µH 220 nF 1.5 µF TCAP TOUT TDI 10 nF VDD TDO VDD OSC Overcurrent VPUMP 220 nF Overcurrent 15 Ω 100 µF 100 nF C10 C1 L1 D1 C5 C2 C4 C3 R3 R4 R5 R6 C9 R2 C8 D2 C6 C7 L2 R1 Tracking Regulator GM ID Characteristics Suggested Manufacturer C1 33 μF, 25 V, esr < 200 mΩ, I ripple > 350 mA Nichicon, part number UHC1E330MET C2, C5,C10 100 nF, 50 V, X5R or X7R C4 100 μF, 35 V, esr < 75 mΩ, I ripple> 800 mA Nichicon, part number UHC1V101MPT C3,C6 220 nF, 50 V, X5R or X7R C7 1.5 μF, 50 V, X5R or X7R C8 6.8 nF, 50 V; Y5V, X5R, or X7R C9 10 nF (maximum), 50 V; Y5V, X5R, or X7R R1 15 Ω, 1%, c W R2 220 Ω, 1%, 2 W R3-R6 Value determined by V DD, bus capacitance. etc. L1 33 μH, I DC > 1.3 A TDK, part number TSL0808-330K1R4 L2 33 μH, I DC > 0.5 A TDK, part number TSL0808-330K1R4 D1 1 A, 35 V or 40 V, Schottky diode Various, part number 1N5819; Sanken, part number AW04 D2 1 A, 100 V, 1N4002 Tone detector and leads TDI and TDO are not provided in 16-pin package (A8285). |
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