HIP6602A データシートの表示（PDF） - Intersil
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HIP6602A Datasheet PDF : 10 Pages
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HIP6602A
The power dissipation approximation is a result of power
transferred to and from the upper and lower gates. But, the
internal bootstrap device also dissipates power on-chip
during the refresh cycle. Expressing this power in terms of
the upper MOSFET total gate charge is explained below.
The bootstrap device conducts when the lower MOSFET or
its body diode conducts and pulls the PHASE node toward
GND. While the bootstrap device conducts, a current path is
formed that refreshes the bootstrap capacitor. Since the
upper gate is driving a MOSFET, the charge removed from
the bootstrap capacitor is equivalent to the total gate charge
of the MOSFET. Therefore, the refresh power required by
the bootstrap capacitor is equivalent to the power used to
charge the gate capacitance of the upper MOSFETs.
PREFRESH
=
fSW
QLOSS
V
P
V
C
C
=
fSW
QU
V
PV
CC
where QLOSS is the total charge removed from the bootstrap
capacitors and provided to the upper gate loads.
In Figure 1, CU and CL values are the same and frequency
is varied from 10kHz to 2MHz. PVCC and VCC are tied
together to a +12V supply.
Figure 2 shows the dissipation in the driver with 1nF loading
on both gates and each individually. Figure 3 is the same as
Figure 2 except the capacitance is increased to 3nF.
The impact of loading on power dissipation is shown in
Figure 4. Frequency is held constant while the gate
capacitors are varied from 1nF to 5nF. VCC and PVCC are
tied together and to a +12V supply. Figures 5 through 7
show the same characterization for PVCC tied to +5V
instead of +12V. The gate supply voltage, PVCC, within the
HIP6602A sets both upper and lower gate driver supplies at
the same 5V level for the last three curves.
Test Circuit
+5V OR +12V
+12V
+5V OR +12V
0.01µF
PVCC
0.15µF
VCC
0.15µF
PWM1
PGND
GND
PWM2
BOOT1
UGATE1
PHASE1
2N7002
CU
LGATE1
2N7002
CL
100kΩ
0.01µF
BOOT2
UGATE2
PHASE2
2N7002
CU
LGATE2
2N7002
CL
100kΩ
Typical Performance Curves
1200
1000
800
CU = CL
= 5nF
CU = CL
= 4nF
CU = CL
= 3nF
PVCC = 12V
VCC = 12V
600
CU = CL = 2nF
400
CU = CL = 1nF
200
0
0
500
1000
1500
FREQUENCY (kHz)
FIGURE 1. POWER DISSIPATION vs FREQUENCY
1200
1000
PVCC = VCC = 12V
CU = CL = 1nF
800
CL = 1nF, CU = 0nF
600
400
CU = 1nF, CL = 0nF
200
0
0
500
1000
1500
FREQUENCY (kHz)
FIGURE 2. 1nF LOADING PROFILE
2000
7
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