IRPP3637-12A Infineon

IRPP3637-12A POWIR+ Chipset Reference Design 12Amp Single Phase Synchronous Buck TM POWIR+ Chipset Reference Design using IR3637SPBF PWM & Driver IC and IRF7823PBF & IRF7832ZPBF SO-8 MOSFETs By Steve Oknaian, Senior Applications Engineer Table of Contents Page Introduction ..........................................................................................2 Design Details ......................................................................................2 Start-Up Procedure ..............................................................................3 Layout Considerations .........................................................................4 Circuit Schematic .................................................................................5 Complete Bill of Materials.....................................................................6 PCB layouts .........................................................................................7-8 Electrical Efficiency & Power Loss .......................................................9 Thermal Performance & Bode Plot.......................................................10 Input & Output Ripple Waveforms........................................................11 Load Step Waveforms..........................................................................12 Power Up & Power Down Waveforms..................................................13 Short Circuit Waveforms ......................................................................14 IRPP3637-xxA Reference Design Selector Table................................14 RD www.irf.com 1 assembled and tested customized Introduction reference design (see details on page 14). The IRPP3637- 12A is an optimized TM POWIR+ Chipset reference design, Design Details targeted at low cost, low-to-medium power synchronous buck applications up to 12A output current. The The IRPP3637-12A reference design is IRPP3637-12A uses International optimized for an input voltage range of Rectifiers IR3637SPBF single channel 12V+/-10% and an output voltage of PWM controller in an 8-pin SOIC and 1.8V at a maximum of 12A load current, IRF7823PBF & IRF7832ZPBF SO-8 using the IRF7823PBF and MOSFETs. The IRF7823PBF is utilized IRF7832ZPBF SO-8 MOSFETs. as a high side control FET, and the IRF7832ZPBF is utilized as a low side This chipset is operated at 400kHz synchronous FET. There is an option to switching frequency to allow a good also populate the MOSFET sockets with trade off with size and performance at small can DirectFET MOSFETs to the specified operating conditions. All meet different design goal objectives. the essential components that contribute This reference design has built-in power to a low cost compact solution are design expertise regarding component enclosed by the rectangular box shown selection and PCB layout, and is on the PCB, showing a total solution representative of a realistic final size of 1.3 x 1.2 (1.5 sq). The embedded synchronous buck design, electrical connection diagram is shown intended to simplify the design in effort in figure 1 and the corresponding circuit without unnecessary design iterations. schematic is shown in figure 2. The design is optimized for 12V input +12V External and 1.8V output 12A and 400kHz +12V Vc bias. (J1) (Optional) switching frequency, including (J5) considerations on layout and passive & +12V RTN (J2) magnetic component selection. The IRPP3637-12A delivers the complete 2 +1.8V Vout 12A design in less than 1.5in board RTN (J3) area at up to 84.2% full load electrical efficiency and up to 85.1% peak +12V External Vc +1.8V Vout bias RTN (J4) efficiency. (J6) Figure 1: IRPP3637-12A Electrical Connection Diagram International Rectifier also offers the POWIR+ Chipset on-line design tool Input/Output Connections (