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ACT2102SH-T Datasheet(PDF) 8 Page - Active-Semi, Inc

Part # ACT2102SH-T
Description  Wide 4.5V to 18V Operating Input Range
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Manufacturer  ACTIVE-SEMI [Active-Semi, Inc]
Direct Link  http://www.active-semi.com
Logo ACTIVE-SEMI - Active-Semi, Inc

ACT2102SH-T Datasheet(HTML) 8 Page - Active-Semi, Inc

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ACT2102
Rev 2, 23-May-12
®
Innovative PowerTM
- 8 -
www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
(6)
ESR
RIPPLE
OUTMAX
RIPPLE
R
K
I
V
=
OUT
2
SW
IN
LC
f
28
V
×
+
APPLICATIONS INFORMATION CONT’D
External High Voltage Bias Diode
It is recommended that an external High Voltage
Bias diode be added when the system has a 5V
fixed input or the power supply generates a 5V
output. This helps improve the efficiency of the
regulator. The High Voltage Bias diode can be a
low cost one such as IN4148 or BAT54.
Figure 2:
External High Voltage Bias Diode
This diode is also recommended for high duty cycle
operation and high output voltage applications.
Input Capacitor
The input capacitor needs to be carefully selected
to maintain sufficiently low ripple at the supply input
of the converter. A low ESR capacitor is highly
recommended. Since large current flows in and out
of this capacitor during switching, its ESR also
affects efficiency.
The input capacitance needs to be higher than
10µF. The best choice is the ceramic type,
however, low ESR tantalum or electrolytic types
may also be used provided that the RMS ripple
current rating is higher than 50% of the output
current. The input capacitor should be placed close
to the IN and GND pins of the IC, with the shortest
traces possible. In the case of tantalum or
electrolytic types, they can be further away if a
small parallel 0.1µF ceramic capacitor is placed
right next to the IC.
Output Capacitor
The output capacitor also needs to have low ESR to
keep low output voltage ripple. The output ripple
voltage is:
where IOUTMAX is the maximum output current, KRIPPLE
is the ripple factor, RESR is the ESR of the output
capacitor, fSW is the switching frequency, L is the
inductor value, and COUT is the output capacitance.
In the case of ceramic output capacitors, RESR is very
small and does not contribute to the ripple.
Therefore, a lower capacitance value can be used
for ceramic type. In the case of tantalum or
electrolytic capacitors, the ripple is dominated by
RESR multiplied by the ripple current. In that case, the
output capacitor is chosen to have sufficiently low
ESR.
For ceramic output capacitor, typically choose a
capacitance of about 22µF. For tantalum or
electrolytic capacitors, choose a capacitor with less
than 50mΩ ESR.
Optional Schottky Diode
During the transition between high-side switch and
low-side switch, the body diode of the low-side
power MOSFET conducts the inductor current. The
forward voltage of this body diode is high. An
optional Schottky diode may be paralleled between
the SW pin and GND pin to improve overall
efficiency.


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