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SC1175EVB-2 Datasheet(PDF) 5 Page - Semtech Corporation |
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SC1175EVB-2 Datasheet(HTML) 5 Page - Semtech Corporation |
5 / 20 page 5 ã 2000 Semtech Corp. www.semtech.com SC1175 POWER MANAGEMENT Applications Information NOTES (1) Block 1 (top) is the Master and Block 2 (bottom) is the Slave in current sharing configuration. (2) For independant operation there is no Master or Slave. Theory of Operation Main Loop(s) The SC1175 is a dual, voltage mode synchronous Buck controller, the two separate channels are identical 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 chan- nel 1 and an inverted sawtooth for channel 2. Each channel has its own current limit comparator. Chan- nel 1 has the positive input of the error amplifier internally connected to Vref. Channel 2 has both inputs of the error amplifier uncommitted and avail- able externally. This allows the SC1175 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 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- Block Diagram |
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