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LTC3874 Datasheet(PDF) 11 Page - Linear Technology |
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LTC3874 Datasheet(HTML) 11 Page - Linear Technology |
11 / 28 page LTC3874 11 3874f For more information www.linear.com/LTC3874 Figure 1. Multiphase Operation Frequency Selection and Phase-Locked Loop (FREQ and SYNC Pins) Theselectionofswitchingfrequencyisatrade-offbetween efficiency and component size. Low frequency operation increasesefficiencybyreducingMOSFETswitchinglosses, butrequireslargerinductanceand/orcapacitancetomain- tain low output ripple voltage. The switching frequency of the LTC3874 controllers can be selected using the FREQ pin. If the SYNC pin is not being driven by an external clock source, the FREQ pin can be used to program the control- ler’s operating frequency from 250kHz to 1MHz. There is a precision 10µA current flowing out of the FREQ pin, so the usercanprogramthecontroller’sswitchingfrequencywith a single resistor to GND. A curve is provided later in the application section showing the relationship between the voltage on the FREQ pin and switching frequency (Figure 5). A phase-locked loop (PLL) is integrated in the LTC3874 to synchronize the internal oscillator to an external clock source on the SYNC pin. The PLL loop filter network is integrated inside the LTC3874. The phase-locked loop is capable of locking to any frequency within the range of 250kHz to 1MHz. The frequency setting resistor should always be present to set the controller’s initial switching frequency before locking to the external clock. LTC3874 240° 120° LTC3866 0° 3 PHASE OPERATION 6 PHASE OPERATION 4 PHASE OPERATION CH0 CH1 LTC3874 90° 270° PHASMD = GND PHASMD = FLOAT CH1 CH2 CH0 CH1 LTC3874 120° 300° LTC3875 0° 240° PHASMD = GND PHASMD = INTVCC PHASMD = 2/3 INTVCC CH1 CH2 CH0 CH1 LTC3874 SYNC CLKOUT CLKOUT SYNC SYNC CLKOUT SYNC 60° 180° CH0 CH1 3874 F01 PHASMD = 1/3 INTVCC LTC3875 0° 180° OPERATION |
Similar Part No. - LTC3874_15 |
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Similar Description - LTC3874_15 |
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