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A8286SETTR-TB Datasheet(PDF) 1 Page - Allegro MicroSystems |
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A8286SETTR-TB Datasheet(HTML) 1 Page - Allegro MicroSystems |
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1 / 19 page  Description Intended for analog and digital satellite receivers, this dual low-noise block converter regulator (LNBR) is a monolithic linear and switching voltage regulator, specifically designed to provide the power and the interface signals to two LNB down converters via coaxial cables. TheA8286 requires few external components,withtheboostswitchesandcompensationcircuitry integrated inside of the device. A high switching frequency is chosen to minimize the size of the passive filtering components, further assisting in cost reduction. The high level of component integration ensures extremely low noise and ripple figures. The A8286 has been designed for high efficiency, utilizing the Allegro® advanced BCD process. The integrated boost switches have been optimized to minimize both switching and static losses. To further enhance efficiency, the voltage drop across the tracking regulators has been minimized. The A8286 has integrated tone detection capability, to support full two-way DiSEqC™ communications. Several schemes are available for generating tone signals, all the way down to no-load, and using either the internal clock or an external time source. 8286-DS, Rev. 17 Dual LNB Supply and Control Voltage Regulator Continued on the next page… Functional Block Diagram A8286 LX1 Boost Converter LNB1 VIN 220 nF TCAP1 22 nF Clock Divider BOOST1 Channel 1 A8286 VOUT1 SDA SCL I2 C Compatible Interface Fault Monitor OCP1 OCP2 PNG1 PNG2 TSD VUV EXTM1 VDD VS IRQ GND Oscillator Regulator Tone Detect TDO1 TDI1 VREG TDO1 TCAP1 Fsw Fsw 22 kHz EXTM1 TGate1 TMode1 10 nF GNDLX1 LNB Voltage Control Wave Shape Linear Stage C7 C8 C10 C3 220 nF R4 15 R6 L1 33 H D1 D2 220 H L2 R5 R7 100 C11 0.68 F 30 R8 D4 R1 R2 R3 220 nF C9 C B A D3 C DAC C12 D D VCP1 Charge Pump VPump 100 nF C4 10 nF C13 100 F C2 PAD nF C1 100 100 F C5 1 F C6 L3 1 H R8-C11 network is needed only when high inductive load is applied, such as ProBrand LNB. Channel 1 of 2 channels shown. B C D A D3 and D4 are used for surge protection. Either C12 or C9 should be used, but not both. Features and Benefits ▪ 2-wire serial I2C™ -compatible interface: control (write) and status (read) ▪ LNB voltages (16 programmable levels) compatible with all common standards ▪ Tracking switch-mode power converter for lowest dissipation ▪ Integrated converter switches and current sensing ▪ Output current limit of 900 mA typical, with 48 ms timer ▪ Static current limit circuit allows full current at startup and 13 →18V output transition; reliably starts wide load range ▪ Push-pull output stage minimizes 13 →18V and 18→13V output transition times for highly capacitive loads ▪ Adjustable rise/fall time via external timing capacitor ▪ Built-in tone oscillator, factory-trimmed to 22 kHz facilitates DiSEqC™ tone encoding, even at no-load ▪ Four methods of 22 kHz tone generation, via I2C™ data bits and/or external pin ▪ 22 kHz tone detector facilitates DiSEqC™ 2.0 decoding ▪ Diagnostics for output voltage level, input supply UVLO, and DiSEqC™ tone output ▪ Cable disconnect diagnostic ▪ Auxiliary modulation input ▪ LNB overcurrent with timer Package: 28-pin QFN (suffix ET) 5 mm × 5 mm (Not to scale) |
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Similar Description - A8286SETTR-TB |
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