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SC1176 Datasheet(PDF) 6 Page - Semtech Corporation |
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SC1176 Datasheet(HTML) 6 Page - Semtech Corporation |
6 / 23 page 6 2006 Semtech Corp. www.semtech.com POWER MANAGEMENT SC1176/SC1176A NOTES (1) Block 1 (top) is the Master and Block 2 (bottom) is the Slave in current sharing configuration. (2) For independent operation there is no Master or Slave. Main Loop(s) The SC1176 is a dual, voltage mode synchronous Buck controller, the two separate channels are identi- cal and share only IC supply pins (Vcc and GND), output driver ground (PGND) and pre-driver supply voltage (BSTC). They also share a common oscillator generating a sawtooth waveform for channel 1 and an inverted sawtooth for channel 2. Each channel has its own current limit comparator. Channel 1 has the positive input of the error amplifier internally connected to Vref. Channel 2 has both inputs of the error ampli- fier uncommitted and available externally. This allows the SC1176 to operate in two distinct modes. a) Two independent channels with either com- mon or different input voltages and different output voltages. The two channels each have Block Diagram Applications Information - Theory of Operation their own voltage feedback path from their own output. In this mode, the positive input of error amplifier 2 is connected externally to Vref. If the application uses a common input voltage, the sawtooth phase shift between the channels provides some measure of input ripple current cancellation. b) Two channels operating in current sharing mode with common output voltage and either common input voltage or different input voltages. In this mode, channel 1 operates as a voltage mode Buck controller, as before, but error amp 2 monitors and amplifies the difference in voltage across the output current sense resistors of channel 1 and channel 2 (Master and Slave) and adjusts the Slave duty cycle to match output currents. Because of finite gain and offsets in the loop, the resistor ratio for perfect current match- |
Similar Part No. - SC1176_06 |
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Similar Description - SC1176_06 |
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