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HIP6004ECVZ Datasheet(PDF) 10 Page - Intersil Corporation |
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HIP6004ECVZ Datasheet(HTML) 10 Page - Intersil Corporation |
10 / 13 page 10 within their maximum junction temperature at high ambient temperature by calculating the temperature rise according to package thermal-resistance specifications. A separate heatsink may be necessary depending upon MOSFET power, package type, ambient temperature and air flow. Standard-gate MOSFETs are normally recommended for use with the HIP6004E. However, logic-level gate MOSFETs can be used under special circumstances. The input voltage, upper gate drive level, and the MOSFET’s absolute gate-to- source voltage rating determine whether logic-level MOSFETs are appropriate. Figure 9 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 lower MOSFET, Q2 turns on. Logic-level MOSFETs can only be used if the MOSFET’s absolute gate-to-source voltage rating exceeds the maximum voltage applied to VCC. Figure 10 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 and a logic-level MOSFET can be used for Q2 if its absolute gate-to-source voltage rating exceeds the maximum voltage applied to VCC. PUPPER = Io 2 x r DS(ON) x D + 1 2 Io x VIN x tSW x FS PLOWER = Io 2 x r DS(ON) x (1 - D) Where: D is the duty cycle = VOUT / VIN, tSW is the switch ON time, and FS is the switching frequency. +12V PGND HIP6004E GND LGATE UGATE PHASE BOOT VCC +5V OR +12V NOTE: NOTE: VG-S ≈ VCC CBOOT DBOOT Q1 Q2 + - FIGURE 9. UPPER GATE DRIVE - BOOTSTRAP OPTION VG-S ≈ VCC -VD D2 + VD - +12V PGND HIP6004E GND LGATE UGATE PHASE BOOT V CC +5V OR LESS NOTE: NOTE: VG-S ≈ VCC Q1 Q2 + - FIGURE 10. UPPER GATE DRIVE - DIRECT VCC DRIVE OPTION VG-S ≈ VCC -5V D2 HIP6004E |
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