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PM6675 Datasheet(PDF) 37 Page - STMicroelectronics

Part # PM6675
Description  Very fast load transient response using constant on-time control loop
PDF  47 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6675 Datasheet(HTML) 37 Page - STMicroelectronics

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PM6675
Application information
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If ceramic capacitors are used, the output voltage ripple due to inductor current ripple is
negligible. Then the inductance should be smaller, reducing the size of the choke. In this
case it is important that output capacitor can adsorb the inductor energy without generating
an over-voltage condition when the system changes from a full load to a no load condition.
The minimum output capacitance can be chosen by the following equation:
Equation 39
where Vf is the output capacitor voltage after the load transient, while Vi is the output
capacitor voltage before the load transient.
In Table 11 are listed some tested polymer capacitors.
7.1.4
MOSFETs selection
In a notebook application, power management efficiency is a high level requirement.
The power dissipation on the power switches becomes an important factor in the selection
of switches. Losses of high-side and low-side MOSFETs depend on their working condition.
Considering the high-side MOSFET, the power dissipation is calculated as:
Equation 40
Maximum conduction losses are approximately given by:
Equation 41
Table 11. Evaluated output capacitors
Manufacturer
Series
Capacitance
(µF)
Rated voltage
(V)
ESR max @100kHz
(m
Ω)
SANYO
4TPE220MF
220
4V
15 to 25
4TPE150MI
220
4V
18
4TPC220M
220
4V
40
HITACHI
TNCB OE227MTRYF
220
2.5V
25
2
2
MAX
,
LOAD
min
,
OUT
Vi
Vf
I
L
C
−
⋅
=
switching
conduction
DHighSide
P
P
P
+
=
2
MAX
,
LOAD
min
.
IN
OUT
DSon
conduction
I
V
V
R
P
⋅
⋅
=



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