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ISL6520BCBZ Datasheet(PDF) 8 Page - Intersil Corporation |
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ISL6520BCBZ Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 10 page 8 FN9083.2 January 20, 2005 circumvented by these MOSFETs if they have large parasitic impedences and/or capacitances that would inhibit the gate of the MOSFET from being discharged below it’s threshold level before the complementary MOSFET is turned on. Figure 6 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. The supply is refreshed to a voltage of VCC less the boot diode drop (VD) each time the lower MOSFET, Q2, turns on. ISL6520B DC-DC Converter Application Circuit Figure 7 shows an application circuit of a DC-DC Converter. Detailed information on the circuit, including a complete Bill- of-Materials and circuit board description, can be found in Application Note AN9932. +5V ISL6520B GND LGATE UGATE PHASE BOOT VCC +5V NOTE: NOTE: VG-S ≈ VCC CBOOT DBOOT Q1 Q2 + - FIGURE 6. UPPER GATE DRIVE BOOTSTRAP VG-S ≈ VCC -VD + VD - Component Selection Notes: CIN - Each 330mF 6.3WVDC, Sanyo 6TPB330M or Equivalent. COUT - Each 330mF 6.3WVDC, Sanyo 6TPB330M or Equivalent. D1 - 30mA Schottky Diode, MA732 or Equivalent L1 - 3.1µH Inductor, Panasonic P/N ETQ-P6F2ROLFA or Equivalent. Q1, Q2 - Fairchild MOSFET; HUF76143. FIGURE 7. 5V to 3.3V 15A DC-DC CONVERTER +5V VOUT FB COMP/SD UGATE PHASE BOOT VCC GND LGATE + 5 7 6 3 2 1 8 4 ISL6520B + 3.16k Ω L1 COUT D1 0.1 µF CIN 2 x 1 µF Q1 Q2 U1 0.1 µF POR REF OSC + - - + 3 x 330 µF 2 x 330 µF 0.1 µF 1.00k Ω 10.0k Ω 470pF 8200pF 60.4 Ω 18000pF AND SOFT START 50k Ω ISL6520B |
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