LMV1090 Dual Input Far Field Noise Suppression Microphone Amplifier

Posted on Feb 6, 2014

Figure 1 shows the schematic for a universal input, 7. 6 V, 700 mA CV/CC power supply for LED Driver applications, using the LinkSwitch-II product LNK606PG in a‚ flyback con guration. The LNK606PG (U1) combines a power switching device, Oscillator CV/CC control engine, and startup and protection functions in one IC. Diodes D1 through D4 rectify

LMV1090 Dual Input Far Field Noise Suppression Microphone Amplifier
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the AC input. Capacitors C1 and C2 lter the recti ed AC. In combination with inductors L1 and L2, these capacitors also attenuate conducted differential-mode EMI noise. Resistors R1 and R2 dampen any resulting resonant ringing between capacitors and inductors. This con guration, along with Power Integrations` transformer E-Shield technology, ensures meeting EMI standard EN55015 class B with >10 dB margin, using no Y capacitor. Fusible resistor RF1 limits inrush current at startup, and fuses if any component fails from excess input current. This power supply design uses the inherent CC feature of U1 to drive LED loads and CAN operate at maximum power output in CC mode. IC U1`s CV mode provides output overvoltage protection if an LED should have an open-circuit failure.

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