NCP1529ASNT1GEVB ON Semiconductor, NCP1529ASNT1GEVB Datasheet - Page 8

• Manufacturer Part Number: NCP1529ASNT1GEVB
• Description: BOARD EVAL NCP1529
• Manufacturer: ON Semiconductor

Specifications of NCP1529ASNT1GEVB

• Design Resources: NCP1529ASNT1GEVB Schematic NCP1529ASNT1GEVB Gerber Files NCP1529ASNT1GEVB Bill of Materials
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Input Capacitor Selection
with large switching noise. Using an input bypass capacitor
can reduce the peak current transients drawn from the input
supply
significantly. The capacitance needed for the input bypass
capacitor depends on the source impedance of the input
supply.
with maximum output current, which is IO, max/2.
should be used for most of the cases. For effective bypass
results, the input capacitor should be placed as close as
possible to the VIN Pin
Output L-C Filter Design Considerations
current mode architecture. The correct selection of the
output filter ensures good stability and fast transient
response.
filter must be selected to work with internal compensation.
For NCP1529, the internal compensation is internally fixed
and it is optimized for an output filter of L = 2.2 mH and
C
the corner frequency is moved, it is recommended to check
the loop stability depending of the accepted output ripple
voltage and the required output current. Take care to check
the loop stability. The phase margin is usually higher than
45°.
Inductor Selection
performances are saturation current and DC resistance and
Table 1. LIST OF INPUT CAPACITOR
OUT
Table 2. L-C FILTER EXAMPLE
Taiyo Yuden
In PWM operating mode, the input current is pulsating
The maximum RMS current occurs at 50% duty cycle
For NCP1529, a low profile ceramic capacitor of 4.7 mF
The NCP1529 operates at 1.7 MHz frequency and uses
Due to the nature of the buck converter, the output L-C
The corner frequency is given by:
The device operates with inductance value of 2.2 mH. If
The inductor parameters directly related to device
f
c
Murata
TDK
+
= 10 mF.
Inductance (L)
2p L
source,
2.2 mH
4.7 mH
1
GRM188R60J475KE
GRM21BR71C475KA
JMK212BY475MG
C2012X5R0J475KT
C1608X5R0J475KT
C
OUT
thereby
+
2p 2.2 mH
reducing
Output Capacitor (C
1
NCP1529 - COMPONENTS SELECTION
10 mF
4.7 mF
switching
10 mF
+ 34 kHz
4.7 mF
4.7 mF
4.7 mF
OUT
http://onsemi.com
(eq. 1)
NCP1529EVB
noise
)
8
inductance value. The inductor ripple current (DI
decreases with higher inductance:
•
•
•
higher than the maximum load current plus half the ripple
current:
•
•
efficiency of the converter. For best performances, the DC
resistance should be less than 0.3 W for good efficiency.
Output Capacitor Selection
desired output ripple voltage. Ceramic capacitors with low
ESR values will have the lowest output ripple voltage and
are strongly recommended. The output capacitor requires
either an X7R or X5R dielectric.
The output ripple voltage in PWM mode is given by:
Table 3. LIST OF INDUCTOR
Table 4. LIST OF OUTPUT CAPACITOR
Taiyo Yuden
The saturation current of the inductor should be rated
The inductor's resistance will factor into the overall
Selecting the proper output capacitor is based on the
DI
L: Inductor value
f
I
I
DV
SW
L(max)
O(max)
Murata
L
TDK
: Switching frequency
: Peak to peak inductor ripple current
OUT
: Maximum inductor current
Taiyo Yuden
: Maximum Output current
Coil Craft
+ DI
FDK
TDK
DI
I
L(max)
L
GRM188R60J475KE
GRM21BR71C475KA
GRM188R60OJ106ME
JMK212BY475MG
JMK212BJ106MG
C2012X5R0J475
C1608X5R0J475
C2012X5R0J106
L
+
4
L
+ I
V
OUT
O(max)
f
f
SW
SW
1
)
MIPW3226 Series
VLF3010AT Series
TFC252005 Series
LQ CBL2012
DO1605-T Series
LPS3008
1 *
C
DI
OUT
2
V
L
V
OUT
) ESR
IN
4.7 muF
4.7 mF
4.7 mF
10 mF
10 mF
10 mF
(eq. 2)
(eq. 3)
(eq. 4)
L
)