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HIP6002 Datasheet(PDF) 10 Page - Intersil Corporation

Part # HIP6002
Description  Rectifier (PWM) Controller and Output Voltage Monitor
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

HIP6002 Datasheet(HTML) 10 Page - Intersil Corporation

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10
the upper MOSFET switching losses. Ensure that both
MOSFETs are 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 HIP6002. 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 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 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 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 +5 VDC or
less. The peak upper gate-to-source voltage is approximately
VCC less the input supply. For + 5V main power and + 12
VDC 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.
Schottky Selection
Rectifier D2 is a clamp that catches the negative inductor
swing during the dead time between turning off the lower
MOSFET and turning on the upper MOSFET. The diode
must be a Schottky type to prevent the lossy parasitic
MOSFET body diode from conducting. It is acceptable to
omit the diode and let the body diode of the lower MOSFET
clamp the negative inductor swing, but efficiency will drop
one or two percent as a result. The diode’s rated reverse
breakdown voltage must be greater than the maximum input
voltage.
HIP6002 DC-DC Converter Application
Circuit
Figure 12 shows an application circuit of a DC-DC Converter
for an Intel Pentium Pro microprocessor. Detailed
information on the circuit, including a complete
Bill-of-Materials and circuit board description, can be found
in Application Note AN9668. See Intersil’s home page on the
web: www.intersil.com or Intersil AnswerFAX
(321-724-7800) document # 99668.
+12V
PGND
HIP6002
GND
LGATE
UGATE
PHASE
BOOT
VCC
+5V OR +12V
NOTE:
NOTE:
VG-S VCC
CBOOT
DBOOT
Q1
Q2
+
-
FIGURE 10. UPPER GATE DRIVE - BOOTSTRAP OPTION
VG-S VCC -VD
VD
+
D2
-
+12V
PGND
HIP6002
GND
LGATE
UGATE
PHASE
BOOT
VCC
+5V OR LESS
NOTE:
NOTE:
VG-S VCC
Q1
Q2
+
-
FIGURE 11. UPPER GATE DRIVE - DIRECT VCC DRIVE OPTION
VG-S VCC -5V
D2
HIP6002


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