Datasheet

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SNUBBER CIRCUIT
POWER GOOD
µ
kΩ
µ µ
µ
kΩ
µF
µF
µF µF
µ
µF
Ω
14.7 kΩ
10 kΩ
71.5 kΩ
C1 = T520D337M0O4ASE015 (Kemet)
C2 = TDK C3225X5R0J107M ceramic 6.3 V X5R
L1 = IHLP2525CZ−01 0.68 µH (Vishay Dale)
The following part numbers are used for test purposes:
TPS54010
SLVS509B – MAY 2004 – REVISED JUNE 2005
AGND. The value should be 1.0 µF. Both capacitors
should be high-quality ceramic types with X7R or
R10 and C11 of the application schematic comprise a
X5R grade dielectric for temperature stability. They
snubber circuit. The snubber is included to reduce
should be placed as close to the device connection
overshoot and ringing on the phase node when the
pins as possible.
internal high-side FET turns on. Because the fre-
quency and amplitude of the ringing depends to a
large degree on parasitic effects, it is best to choose
these component values based on actual measure-
The TPS54010 is provided with a power-good output
ments of any design layout. See literature number
pin PWRGD. This output is an open-drain output and
SLUP100 for more detailed information on snubber
is intended to be pulled up to a 3.3-V or 5-V logic
design.
supply. A 10-k Ω pullup works well in this application.
Figure 13. 1.5-V Power Supply With Ceramic Output Capacitors
Figure 13 shows an application where all ceramic are used. The compensation network components
capacitors, including the main output filter capacitor, were calculated using SWIFT Designer Software. See
Figure 22 through Figure 30 for loop response,
performance graphs, and switching waveforms for
this circuit.
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