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ACT2861QI Scheda tecnica(PDF) 46 Page - Active-Semi, Inc

Il numero della parte ACT2861QI
Spiegazioni elettronici  30V Buck-Boost Charger with Integrated MOSFETs and OTG
Download  91 Pages
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Produttore elettronici  ACTIVE-SEMI [Active-Semi, Inc]
Homepage  http://www.active-semi.com
Logo ACTIVE-SEMI - Active-Semi, Inc

ACT2861QI Scheda tecnica(HTML) 46 Page - Active-Semi, Inc

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ACT2861QI
Rev 2.0, 27-Apr-2018
Innovative PowerTM
www.active-semi.com
ActiveSwitcherTM is a trademark of Active-Semi
Copyright © 2018 Active-Semi, Inc.
46
Where COTG_IN is the OTG input capacitance (Charging
output capacitance) in uF, IOTG is the OTG output cur-
rent in Amperes, VOTG is the OTG output voltage in volts,
Vin is the OTG input voltage in volts, FSW is the switching
frequency in Hz, and Vripple is the maximum OTG input
voltage ripple in volts.
If the OTG input source is a battery, no additional ca-
pacitance is needed. If the OTG input source is a power
supply rail, add an additional 100uF bulk electrolytic ca-
pacitor is recommended.
The ceramic capacitor PCB placement is critical. Refer
to the Layout Guidelines selection and to the EVK layout
for details.
Be sure to consider the input capacitor’s DC bias effects.
A capacitor’s actual capacitance is strongly affected by
its DC bias characteristics. The input capacitor is typi-
cally an X5R, X7R, or similar dielectric. Use of Y5U, Z5U,
or similar dielectrics is not recommended. Input capaci-
tor placement is critical for proper operation. The input
capacitor must be placed as close to the IC as possible.
The traces from VBAT to the capacitor and from the ca-
pacitor to PGND should as short and wide as possible.
OTG – Output Capacitor Selection
Note that the OTG COUT capacitors are also the charg-
ing input capacitors. They are connected to VIN. The
output capacitance must be a combination of ceramic
and bulk capacitance.
Table 9 gives the required capacitor values for stability.
Note that the table has two output capacitor options:
Standard Capacitance and Minimum Capacitance. The
Standard Capacitance design requires more overall ca-
pacitance, but places no restriction on the bulk capacitor
ESR. The Minimum Capacitance design results in an
overall smaller design, but places restrictions on the
ESR. The capacitor values can be increased without
limit.
Note that the Ceramic and Bulk capacitor values are
recommended “Capacitor Values”. When choosing the
ceramic capacitors, use X5R or X7R dielectrics and be
sure to consider the capacitor’s tolerance and DC bias
effects. Use of Y5U, Z5U, or similar dielectrics is not
recommended. The 22uF capacitor must have at least
9uF of effective capacitance for stability. The 47uF ca-
pacitor must have 19uF of capacitance. The bulk capac-
itors do not have DC bias effects.
Output ceramic capacitor placement is critical for proper
operation. The output capacitor must be placed as close
to the IC as possible. The traces from VIN to the capac-
itor and from the capacitor to PGND should as short and
wide as possible. The bulk capacitor should be placed
to the left of the current sense resistor. Refer to the Lay-
out Guidelines selection and to the EVK layout for addi-
tional details.
OTG - Inductor Selection
The buck-boost regulator utilizes current-mode control
and a proprietary compensation scheme to simultane-
ously compensate the buck, buck-boost, and boost
modes of operation. The ACT2861 compensation re-
quires a fixed inductor value that is matched to the
switching frequency. Table 9 gives the required inductor
value. Choose an inductor with a low DC-resistance,
and avoid inductor saturation by choosing inductors with
DC ratings that exceed the maximum output current by
at least 30%. The inductor value must be within +30%
to -30% across all operating conditions.
OTG - Compensation
The ACT2861 operates in three switching modes: buck,
buck-boost, and boost mode depending on the input
and output voltage ratios. The IC contains a proprietary
compensation scheme to simultaneously compensate
all three switching modes. The compensation values
are directly tied to the switching frequency and required
inductor value. Table 9 provides the required compen-
sation values. Figure 16 shows the OTG compensation
components.


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