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NCP6334CMTAATBG Datasheet(PDF) 11 Page - ON Semiconductor

Part # NCP6334CMTAATBG
Description  3MHz, 2A Synchronous Buck Converter
Download  14 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP6334CMTAATBG Datasheet(HTML) 11 Page - ON Semiconductor

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NCP6334B, NCP6334C
http://onsemi.com
11
APPLICATION INFORMATION
Output Filter Design Considerations
The output filter introduces a double pole in the system at
a frequency of
fLC +
1
2 @ p @ L @ C
(eq. 2)
The internal compensation network design of the
NCP6334B/C is optimized for the typical output filter
comprised of a 1.0
mH inductor and a 10 mF ceramic output
capacitor, which has a double pole frequency at about
50 kHz. Other possible output filter combinations may have
a double pole around 50 kHz to have optimum operation
with the typical feedback network. Normal selection range
of the inductor is from 0.47
mH to 4.7 mH, and normal
selection range of the output capacitor is from 4.7
mF to
47
mF.
Inductor Selection
The inductance of the inductor is determined by given
peak−to−peak ripple current IL_PP of approximately 20%
to 50% of the maximum output current IOUT_MAX for a
trade−off between transient response and output ripple. The
inductance corresponding to the given current ripple is
L +
VIN * VOUT @ VOUT
VIN @ fSW @ IL_PP
(eq. 3)
The selected inductor must have high enough saturation
current rating to be higher than the maximum peak current
that is
IL_MAX + IOUT_MAX )
IL_PP
2
(eq. 4)
The inductor also needs to have high enough current
rating based on temperature rise concern. Low DCR is good
for efficiency improvement and temperature rise reduction.
Table 1 shows some recommended inductors for high power
applications and Table 2 shows some recommended
inductors for low power applications.
Table 1. LIST OF RECOMMENDED INDUCTORS FOR HIGH POWER APPLICATIONS
Manufacturer
Part Number
Case Size
(mm)
L (mH)
Rated Current (mA)
(Inductance Drop)
Structure
MURATA
LQH44PN2R2MP0
4.0 x 4.0 x 1.8
2.2
2500 (−30%)
Wire Wound
MURATA
LQH44PN1R0NP0
4.0 x 4.0 x 1.8
1.0
2950 (−30%)
Wire Wound
MURATA
LQH32PNR47NNP0
3.0 x 2.5 x 1.7
0.47
3400 (−30%)
Wire Wound
Table 2. LIST OF RECOMMENDED INDUCTORS FOR LOW POWER APPLICATIONS
Manufacturer
Part Number
Case Size
(mm)
L (mH)
Rated Current (mA)
(Inductance Drop)
Structure
MURATA
LQH44PN2R2MJ0
4.0 x 4.0 x 1.1
2.2
1320 (−30%)
Wire Wound
MURATA
LQH44PN1R0NJ0
4.0 x 4.0 x 1.1
1.0
2000 (−30%)
Wire Wound
TDK
VLS201612ET−2R2
2.0 x 1.6 x 1.2
2.2
1150 (−30%)
Wire Wound
TDK
VLS201612ET−1R0
2.0 x 1.6 x 1.2
1.0
1650 (−30%)
Wire Wound
Output Capacitor Selection
The output capacitor selection is determined by output
voltage ripple and load transient response requirement. For
a given peak−to−peak ripple current IL_PP in the inductor
of the output filter, the output voltage ripple across the
output capacitor is the sum of three ripple components as
below.
VOUT_PP [ VOUT_PP(C) ) VOUT_PP(ESR) ) VOUT_PP(ESL)
(eq. 5)
where VOUT_PP(C) is a ripple component by an equivalent
total capacitance of the output capacitors, VOUT_PP(ESR)
is a ripple component by an equivalent ESR of the output
capacitors, and VOUT_PP(ESL) is a ripple component by
an equivalent ESL of the output capacitors. In PWM
operation mode, the three ripple components can be
obtained by
VOUT_PP(C) +
IL_PP
8 @ C @ fSW
(eq. 6)
VOUT_PP(ESR) + IL_PP @ ESR
(eq. 7)
VOUT_PP(ESL) +
ESL
ESL ) L
@ VIN
(eq. 8)
and the peak−to−peak ripple current is
IL_PP +
VIN * VOUT @ VOUT
VIN @ fSW @ L
(eq. 9)


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