ncv8925 ON Semiconductor, ncv8925 Datasheet - Page 12

• Manufacturer Part Number: ncv8925
• Description: 3 Mhz, 600 Ma Step-down Dc-dc Converter
• Manufacturer: ON Semiconductor

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
an X7R dielectric.
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Selecting the proper output capacitor is based on the
The output ripple voltage in PWM mode is given by:
DV OUT + DI L
DV
DI
f
C
ESR: Output Capacitor Serial Resistor
SW
OUT
L:
OUT
: Switching Frequency
Peak to Peak Inductor Ripple Current
: Output Capacitor
: Output Voltage Ripple in PWM Mode
4
f SW
1
C OUT
) ESR
http://onsemi.com
(eq. 6)
NCV8925
12
Feed-Forward Capacitor Selection
response and is critical to obtain good loop stability.
or higher ceramic capacitor is needed. Choose a small
ceramic capacitor X7R dielectric.
Table 4. LIST OF OUTPUT CAPACITORS
Murata
TDK
The feed-forward capacitor sets the feedback loop
Given that the compensation is internally fixed, an 18 pF
GCM31CR71C475
GCM31CR71A106
C3216X7R1E475MT
C3216X7R1C106MT
4.7 mF
4.7 mF
10 mF
10 mF