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参数资料
| 型号： | DC1568A |
| 厂商： | Linear Technology |
| 文件页数： | 13/26页 |
| 文件大小： | 0K |
| 描述： | BOARD BATTERY CHARGER SOLAR PWR |
| 视频文件： | Linear Technology LT3652 |
| 设计资源： | DC1568A Design Files DC1568A Schematic |
| 特色产品： | Energy Harvesting Power Products |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电池充电器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | LT3652 |
| 主要属性： | 多种化学，太阳能 |
| 次要属性： | LED 状态指示器 |
| 已供物品： | 板 |
| 相关产品： | LT3652HVIMSE#TRPBF-ND - IC BATTERY CHARGER 2A 12-MSOP LT3652HVIMSE#PBF-ND - IC BATTERY CHARGER 2A 12-MSOP LT3652HVIDD#TRPBF-ND - IC BATTERY CHARGER 2A 12-DFN LT3652HVIDD#PBF-ND - IC BATTERY CHARGER 2A 12-DFN LT3652HVEMSE#TRPBF-ND - IC BATTERY CHARGER 2A 12-MSOP LT3652HVEDD#TRPBF-ND - IC BATTERY CHARGER 2A 12-DFN LT3652HVEDD#PBF-ND - IC BATTERY CHARGER 2A 12-DFN LT3652HVEMSE#PBF-ND - IC BATTERY CHARGER 2A 12-MSOP LT3652IMSE#TRPBF-ND - IC BATT CHARGER SOLAR 2A 12MSOP LT3652IMSE#PBF-ND - IC BATT CHARGER SOLAR 2A 12MSOP 更多... |
LT3652
APPLICATIONS INFORMATION
output, additional bypass capacitance may be desired for
visual indication for a no-battery condition (see the Status
LT3652
SW
BOOST
SENSE
BAT
3652 F02
Pins section).
If it is desired to operate a system load from the LT3652
charger output when the battery is disconnected, additional
bypass capacitance is required. In this type of application,
excessive ripple and/or low amplitude oscillations can oc-
cur without additional output bulk capacitance. For these
applications, place a 100μF low ESR non-ceramic capacitor
(chip tantalum or organic semiconductor capacitors such
Figure 2. Zener Diode Reduces Refresh
Voltage for BOOST Pin
V IN / BOOST Start-Up Requirement
The LT3652 operates with a V IN range of 4.95V to 32V,
however, a start-up voltage requirement exists due to
the nature of the non-synchronous step-down switcher
topology used for the charger. If there is no BOOST supply
available, the internal switch requires (V IN – V SW ) ≥ 3.3V
to reliably operate. This requirement does not exist if the
BOOST supply is available and (V BOOST – V SW ) > 2V.
When an LT3652 charger is not switching, the SW pin is
at the same potential as the battery, which can be as high
as V BAT(FLT) . As such, for reliable start-up, the V IN supply
must be at least 3.3V above V BAT(FLT) . Once switching
begins and the BOOST supply capacitor gets charged
such that (V BOOST – V SW ) > 2V, the V IN requirement no
as Sanyo OS-CONs or POSCAPs) from BAT to ground,
in parallel with the 10μF ceramic bypass capacitor. This
additional bypass capacitance may also be required in
systems where the battery is connected to the charger
with long wires. The voltage rating of C BAT must meet or
exceed the battery float voltage.
Inductor Selection
The primary criterion for inductor value selection in an
LT3652 charger is the ripple current created in that inductor.
Once the inductance value is determined, an inductor must
also have a saturation current equal to or exceeding the
maximum peak current in the inductor. An inductor value
(L), given the desired amount of ripple current ( ? I MAX )
can be approximated using the relation:
L = (10 R SENSE / ? I MAX ) ? V BAT(FLT) ?
longer applies.
In low V IN applications, the BOOST supply can be powered
[1 – (V BAT(FLT) / V IN(MAX) )]
(μH)
by an external source for start-up, eliminating the V IN
start-up requirement.
V BAT Output Decoupling
An LT3652 charger output requires bypass capacitance
connected from the BAT pin to ground (C BAT ). A 10μF
ceramic capacitor is required for all applications. In systems
In the above relation, ? I MAX is the normalized ripple cur-
rent, V IN(MAX) is the maximum operational voltage, and
V F is the forward voltage of the rectifying Schottky diode.
Ripple current is typically set within a range of 25% to
35% of I CHG(MAX) , so an inductor value can be determined
by setting 0.25 < ? I MAX < 0.35.
where the battery can be disconnected from the charger
3652fd
13
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