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ACT2861QI Arkusz danych(PDF) 41 Page - Active-Semi, Inc

Numer części ACT2861QI
Szczegółowy opis  30V Buck-Boost Charger with Integrated MOSFETs and OTG
Download  91 Pages
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Producent  ACTIVE-SEMI [Active-Semi, Inc]
Strona internetowa  http://www.active-semi.com
Logo ACTIVE-SEMI - Active-Semi, Inc

ACT2861QI Arkusz danych(HTML) 41 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.
41
Table 6: Fast Charge Safety Timer Response
Condition
Charge Response
Fast Charge Safety Timer Speed
Normal Fast Charge
NONE
Full Speed
VIN Input Regulation
Reduced Charge Current
½ Speed
IIN Input Current Regulation
Reduced Charge Current
½ Speed
Thermal Die Regulation
Reduced Charge Current
½ Speed
Battery Temp Exceed Limits
Suspend Charge
Suspend
Battery Temp Hot or Cold
Reduced Charge Current or VTERM
½ Speed
Table 7: Low Battery Safety Timer Response
Condition
Charge Response
Low Battery Safety Timer Speed
Normal SCOND or PCOND
Charge
NONE
Full Speed
VIN Input Regulation
Reduced Charge Current
½ Speed
IIN Input Current Regulation
Reduced Charge Current
½ Speed
Thermal Die Regulation
Reduced Charge Current
½ Speed
Battery Temp Exceeds JEITA T0
or T6 Limits
Suspend Charge
Suspend
Battery Temp Exceeds JEITA T1-
T2 or T3-T5 Limits
NONE
Full Speed
Safety Timer Configuration Change
When the safety timer value needs to be changed, it is
recommended that the timer is first disabled. Then
change the FC_SAFETY_TIMER[4:0] register. Disable
the safety timer by writing a 1 into I2C bit
DIS_SAFETY_TIMER in register 0x1Bh. This proce-
dure ensures the safety timer properly restarts after new
value is configured.
Charger – Input Capacitor Selection
Note that the Charger CIN capacitors are also the OTG
output capacitors. They are connected to VIN. The input
capacitance should be a combination of ceramic and
bulk capacitance.
If the design only uses Charge mode and does not use
OTG mode, 22uF to 47uF capacitors are typically ac-
ceptable, but the final value is application dependent.
Choose the input capacitor value to keep the input volt-
age ripple less than ~50mV. The input capacitance can
be increased without limit.
C
_
I
Where CCHG_IN is the charging input capacitance (OTG
output capacitance) in uF, ICHG is the charging current in
Amperes, VBAT is the battery voltage in volts, VIN is the
input voltage in volts, FSW is the switching frequency in
Hz, and Vripple is the maximum input voltage ripple in
volts.
An additional 100uF bulk electrolytic capacitor is recom-
mended.
If the design uses OTG Mode, refer to the OTG Output
Capacitor Selection. The OTG Mode capacitor require-
ments take precedence over Charging input capaci-
tance.
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.


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