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August 8, 2012 | ADVANCED DATASHEET | V2.2 | PD97601
6A Highly Integrated SupIRBuckTM
GATE DRIVE LOGIC
The gate drive logic features adaptive dead time,
diode emulation, and a minimum lower gate interval.
An adaptive dead time prevents the simultaneous
conduction of the upper and lower MOSFETs. The lower
gate voltage must be below approximately 1V after PWM
goes HIGH before the upper MOSFET can be gated on.
Also, the differential voltage between the upper gate and
PHASE must be below approximately 1V after PWM goes
LOW before the lower MOSFET can be gated on.
The upper MOSFET is gated on after the adaptive delay
for PWM = HIGH and the lower MOSFET is gated on after
the adaptive delay for PWM = LOW. When FCCM = LOW,
the lower MOSFET is driven ‘off’ when the ZCROSS signal
indicates that the inductor current is about to reverse
direction. The ZCROSS comparator monitors the PHASE
voltage to determine when to turn off the lower MOSFET.
The lower MOSFET stays ‘off’ until the next PWM falling
edge. When the lower peak of the inductor current is
above zero, IR3473 operates in continuous conduction
mode. The continuous conduction mode can also be
selected for all load current levels by pulling FCCM to
HIGH.
Whenever the upper MOSFET is turned ‘off’, it stays
‘off’ for the Min Off Time denoted in the Electrical
Specifications. This minimum duration allows time to
recharge the bootstrap capacitor and allows the over
current monitor to sample the PHASE voltage.
COMPONENT SELECTION
Selection of components for the converter is an iterative
process which involves meeting the specifications and
tradeoffs between performance and cost. The following
sections will guide one through the process.
Inductor Selection
Inductor selection involves meeting the steady state
output ripple requirement, minimizing the switching loss
of the upper MOSFET, meeting transient response
specifications and minimizing the output capacitance.
The output voltage includes a DC voltage and a small AC
ripple component due to the low pass filter which has
incomplete attenuation of the switching harmonics.
Neglecting the inductance in series with the output
capacitor, the magnitude of the AC voltage ripple is
determined by the total inductor ripple current flowing
through the total equivalent series resistance (ESR) of the
output capacitor bank.
One can use equation 5 to find the required inductance.
ΔI is defined as shown in Figure 27. The main advantage
of small inductance is increased inductor current slew rate
during a load transient, which leads to a smaller output
capacitance requirement as discussed in the Output
Capacitor Selection section. The drawback of using smaller
inductances is increased switching power loss in the upper
MOSFET, which reduces the system efficiency and
increases the thermal dissipation.
Figure 27: Typical Input Current Waveform
Input Capacitor Selection
The main function of the input capacitor bank is to provide
the input ripple current and fast slew rate current during
the load current step up. The input capacitor bank must
have adequate ripple current carrying capability to handle
the total RMS current. Figure 27 shows a typical input
current. Equation 6 shows the RMS input current.
The RMS input current contains the DC load current and
the inductor ripple current. As shown in equation 5, the
inductor ripple current is unrelated to the load current.
The maximum RMS input current occurs at the maximum
output current. The maximum power dissipation in the
input capacitor equals the square of the maximum RMS
input current times the input capacitor’s total ESR.
The voltage rating of the input capacitor needs to be
greater than the maximum input voltage because of high
frequency ringing at the phase node. The typical
percentage is 25%.
(6)
I
ΔI
3
1
1FsTI
dttf
Ts
1
I
2
OUT
ON
OUT
Ts
0
2
IN_RMS
(5)
L2 VVT
ΔI OUTINON