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SI9167 Fiches technique(PDF) 4 Page - Vishay Siliconix

No de pièce SI9167
Description  High-Frequency, High-Efficiency Buck Converter Design For Multi-Cell Battery Configured Systems Using Si9167
Download  8 Pages
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Fabricant  VISHAY [Vishay Siliconix]
Site Internet  http://www.vishay.com
Logo VISHAY - Vishay Siliconix

SI9167 Fiches technique(HTML) 4 Page - Vishay Siliconix

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AN727
Vishay Siliconix
www.vishay.com
S FaxBack 408-970-5600
4
Document Number: 70959
07-Jul-99
FIGURE 6. PSM-PWM-PSM Transition
VIN = 7.2 V, VO = 3.6 V, IO = 150 mA
Ch1:
VOUT (200 mV/div)
Ch2:
Inductor Current (500 mA/div)
Ch3:
PWM/PSM (High PWM, Low PSM)
PSM-PWM Operation
The Si9167 can operate in either fixed-frequency PWM mode
or fixed on-time pulse skipping mode (PSM). Switching losses
resulting from the gate charge of the driver and internal
BICMOS circuitry are fixed irrespective of the output power
drawn from the converter. At lower output levels, the
percentage of these losses is high, which makes the circuit
less efficient. Therefore, at output loads lower than 150 mA,
PSM operation is recommended. PSM operation reduces the
operating frequency, depending upon the load, which in turn
reduces the switching losses proportionally and keeps the
efficiency high at all load current levels.
Low operating frequencies can become a concern if they are
in the audible range. Special care has been taken in the Si9167
to ensure that the operating frequency will always be above
20 kHz in pulse-skipping mode at output load currents as low
as 6 mA. A load current of 150 mA is guaranteed in PSM, while
PWM mode is used for higher load current operation. In this
way, converter efficiency is always optimized. Efficiency
versus load plots are provided in figures 14 and 15.
Two different sections control the operation of the converter in
either PWM mode or PSM. When PWM mode is selected, the
PWM control section is active, thereby disabling the PSM
control and vice versa. During the PWM-to-PSM transition,
there is an overlapping time between the PWM and the PSM
circuit activation, which keeps the output voltage from
drooping. However, while transitioning from PSM to PWM,
there is no such overlap. The time needed to activate the PWM
circuit, after the PSM circuit is turned off, is called the blanking
time. During this time there are no pulses. This blanking time
is typically between 5 to 10
ms. Figure 6 shows the behavior of
the output voltage, output, and coil current during the PSM-
PWM-PSM transition. The sag in the output depends upon the
output capacitance and ESR. The capacitor must be selected
for an acceptable droop in output voltage at a maximum load
current in PSM, and is given by the following equation:
V
O_DROP + IOUT
t
BLANK
C
OUT
) ESR
(1)
Where
VO_DROP
=
Output droop during Transition (V)
tBLANK
=
Blanking time (S)
COUT
=
Output Capacitor (F)
ESR
=
ESR of output Capacitor (
W)
IOUT
=
Output Load (A)
Inductor Selection
A wide selection of inductors is available from vendors such as
Vishay Dale, Coiltronix, and Sumida. Major factors to consider
include inductance value, saturating current, and equivalent
series resistance (RL).
Since the Si9167 can be operated at up to 2 MHz, required
inductance for a given output capacitor and ripple current
could be as low as 1.5
mH, where:
(2)
dMIN +
V
OUT ) VR_DROP
V
INMAX * VDSQP
L
MIN +
V
INMAX * VDSQP * VOUT ) VR_DROP
dMIN
0.72
Fsw
DI
V
DSQP + 0.42
I
OUT
V
R_DROP +
R
L ) RTRACE
I
OUT


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