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NCV887001D1R2G Datasheet(PDF) 9 Page - ON Semiconductor

Part # NCV887001D1R2G
Description  Automotive Grade Non-Synchronous Boost Controller
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCV887001D1R2G Datasheet(HTML) 9 Page - ON Semiconductor

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NCV8870
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9
Both duty cycles will actually be higher due to power loss
in the conversion. The exact duty cycles will depend on
conduction and switching losses. If the maximum input
voltage is higher than the output voltage, the minimum duty
cycle will be negative. This is because a boost converter
cannot have an output lower than the input. In situations
where the input is higher than the output, the output will
follow the input, minus the diode drop of the output diode
and the converter will not attempt to switch.
If the calculated Dmax is higher the Dmax of the NCV8870,
the conversion will not be possible. It is important for a boost
converter to have a restricted Dmax, because while the ideal
conversion ration of a boost converter goes up to infinity as
D approaches 1, a real converter’s conversion ratio starts to
decrease as losses overtake the increased power transfer. If
the converter is in this range it will not be able to regulate
properly.
If the following equation is not satisfied, the device will
skip pulses at high VIN:
D
min
fs
w t
on(min)
Where: fs: switching frequency [Hz]
ton(min): minimum on time [s]
2. Select Current Sense Resistor
Current sensing for peak current mode control and current
limit relies on the MOSFET current signal, which is
measured with a ground referenced amplifier. The easiest
method of generating this signal is to use a current sense
resistor from the source of the MOSFET to device ground.
The sense resistor should be selected as follows:
R
S +
V
CL
I
CL
Where: RS: sense resistor [
W]
VCL: current limit threshold voltage [V]
ICL: desire current limit [A]
3. Select Output Inductor
The output inductor controls the current ripple that occurs
over a switching period. A high current ripple will result in
excessive power loss and ripple current requirements. A low
current ripple will result in a poor control signal and a slow
current slew rate in case of load steps. A good starting point
for peak to peak ripple is around 20−40% of the inductor
current at the maximum load at the worst case VIN, but
operation should be verified empirically. The worst case VIN
is half of VOUT, or whatever VIN is closest to half of VOUT.
After choosing a peak current ripple value, calculate the
inductor value as follows:
L
+
V
IN(WC) DWC
DI
L,max fs
Where: VIN(WC): VIN value as close as possible to
half of VOUT [V]
DWC: duty cycle at VIN(WC)
DIL,max: maximum peak to peak ripple [A]
The maximum average inductor current can be calculated
as follows:
I
L,AVG +
V
OUTIOUT(max)
V
IN(min)h
The Peak Inductor current can be calculated as follows:
I
L,peak + IL,avg )
DI
L,max
2
Where: IL,peak: Peak inductor current value [A]
4. Select Output Capacitors
The output capacitors smooth the output voltage and
reduce the overshoot and undershoot associated with line
transients. The steady state output ripple associated with the
output capacitors can be calculated as follows:
DI
OUT(max)
fC
OUT
)
I
OUT(max)
1
* D )
V
IN(min)D
2fL
R
ESR
V
OUT(ripple) +
The capacitors need to survive an RMS ripple current as
follows:
I
Cout(RMS) + IOUT
D
WC
D
WC
)
D
WC
12
D
WC
L
R
OUT
T
SW
2
The use of parallel ceramic bypass capacitors is strongly
encouraged to help with the transient response.
5. Select Input Capacitors
The input capacitor reduces voltage ripple on the input to
the module associated with the ac component of the input
current.
I
Cin(RMS) +
V
IN(min)
2 D
WC
LfsVOUT23
6. Select Feedback Resistors
The feedback resistors form a resistor divider from the
output of the converter to ground, with a tap to the feedback
pin. During regulation, the divided voltage will equal Vref.
The lower feedback resistor can be chosen, and the upper
feedback resistor value is calculated as follows:
Rupper + Rlower
Vout * Vref
V
ref
The total feedback resistance (Rupper + Rlower) should be in
the range of 1 k
W – 100 kW.


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