Three-phase DC regulated power control design based on LTC3731H
Linear's LTC3731H is a three-phase synchronous buck switching power supply controller, to drive all of the external power N-MOSFET, rated operating temperatures up to 140 degrees C. Each of the three-phase controller operates up to 600kHz phase, three-phase output 120 degree phase shift, the three-phase current matching +/- 5%, VREF accuracy over 140 degrees C +/- 2%, mainly used in the automotive and industrial power, high current output DC / DC power article introduction LTC3731H main features, as well as a block diagram a typical application circuit 55A comprises a large current three-phase circuit diagram of a buck converter, a circuit diagram of a three-phase power supply 65A, 2.5V / 100A power supply, and three-phase circuit diagram of 50V / 3A boost converter circuit diagram .The LTC® 3731H is a PolyPhase® synchronous step-down switching regulator controller that drives all N-channel external power MOSFET stages in a phase-lockable fixed frequency architecture. The LTC3731H is rated for operaTIon up to 140 degree C juncTIon temperature. The 3-phase controller drives its output stages with 120 degree phase separaTIon at frequencies up to 600kHz per phase to minimize the RMS current losses in both the input and output filter capacitors. The 3-phase technique effecTIvely triples the fundamental frequency, improving transient response while operating each controller at an optimal frequency for efficiency and ease of thermal design. Light load efficiency is optimized by using a choice of output Stage Shedding or Burst Mode operation.The precision reference supports output voltages from 0.6V to 6V. Current foldback provides protection for the external MOSFETs under short-circuit or overload conditions.Please refer to the LTC3731 data sheet for 0 C to 70 C and-40 C to 85 C rated versions.LTC3731H main characteristics: ■ 3-Phase Current Mode Controller with Onboard MOSFET Drivers ■ 5% Output Current Matching Optimizes Thermal Performance and Size of Inductors and MOSFETs ■ 2% VREF Accuracy Over Temperature up to 140 C ■ Reduced Power Supply induced Noise ■ 10% Power Good Output Indicator ■ 250kHz to 600kHz Per Phase, PLL, Fixed Frequency ■ PWM, Stage SheddingTM or Burst Mode® Operation ■ OPTI-LOOP® Compensation Minimizes COUT ■ Adjustable Soft-Start Current Ramping ■ Short-Circuit Shutdown Timer with Defeat Option ■ Overvoltage Soft Latch ■ Adjustable Undervoltage Lockout Threshold ■ Selectable Phase Output for Up to 12-Phase Operation ■ Available in 36-Pin Narrow (0.209 ") SSOP PackageLTC3731H applications: ■ Automotive and Industrial Pow er Supplies ■ High Output Current DC / DC Power Supplies a block diagram of FIG. 1.LTC3731H 2.LTC3731H large three-phase current circuit diagram of a buck converter power circuit diagram of FIG. 65A-phase 3.LTC3731H 4.LTC3731H 2.5V / 100A power supply circuit diagram of FIG. 5 .LTC3731H-phase 50V / 3A boost converter circuit diagram technology zone
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