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HIP6003 Datasheet(PDF) 10 Page - Intersil Corporation |
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HIP6003 Datasheet(HTML) 10 Page - Intersil Corporation |
10 / 12 page 10 source voltage rating determine whether logic-level MOSFETs are appropriate. Figure 10 shows the upper gate drive (BOOT pin) supplied by a bootstrap circuit from VCC. The boot capacitor, CBOOT, develops a floating supply voltage referenced to the PHASE pin. This supply is refreshed each cycle to a voltage of VCC less the boot diode drop (VD) when the Schottky diode, D2, conducts. Logic-level MOSFETs can only be used if the MOSFETs absolute gate-to-source voltage rating exceeds the maximum voltage applied to VCC. Figure 11 shows the upper gate drive supplied by a direct connection to VCC. This option should only be used in converter systems where the main input voltage is + 5VDC or less. The peak upper gate-to-source voltage is approximately VCC less the input supply. For +5V main power and + 12VDC for the bias, the gate-to-source voltage of Q1 is 7V. A logic- level MOSFET is a good choice for Q1 under these conditions. Schottky Selection Rectifier D2 conducts when the upper MOSFET Q1 is off. The diode should be a Schottky type for low power losses. The power dissipation in the Schottky rectifier is approximated by: In addition to power dissipation, package selection and heatsink requirements are the main design trade-offs in choosing the Schottky rectifier. Since the three factors are interrelated, the selection process is an iterative procedure. The maximum junction temperature of the rectifier must remain below the manufacturer’s specified value, typically 125oC. By using the package thermal resistance specification and the Schottky power dissipation equation (shown above), the junction temperature of the rectifier can be estimated. Be sure to use the available airflow and ambient temperature to determine the junction temperature rise. HIP6003 DC-DC Converter Application Circuit. +12V HIP6003 GND UGATE PHASE BOOT VCC +5V OR +12V NOTE: CBOOT DBOOT Q1 D2 + - FIGURE 10. UPPER GATE DRIVE - BOOTSTRAP OPTION VG-S ≈ VCC -VD VD + - +12V HIP6003 GND UGATE PHASE BOOT VCC +5V OR LESS NOTE: Q1 D2 + - IGURE 11. UPPER GATE DRIVE - DIRECT VCC DRIVE OPTION VG-S ≈ VCC -5V P COND =IO xVf x 1 - D () Where: D is the duty cycle = V O/VIN, and V f is the Schottky forward voltage drop HIP6003 |
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