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LT3650IMSE-4.2PBF 数据表(PDF) 13 Page - Linear Technology

部件名 LT3650IMSE-4.2PBF
功能描述  High Voltage 2 Amp Monolithic Li-Ion Battery Charger
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LT3650IMSE-4.2PBF 数据表(HTML) 13 Page - Linear Technology

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LT3650-4.1/LT3650-4.2
13
36504142fb
Rectifier Selection
The rectifier diode in an LT3650 battery charger provides a
current path for the inductor current when the main power
switch is disabled. The rectifier is selected based upon
forward voltage, reverse voltage, and maximum current.
A Schottky diode is required, as low forward voltage yields
the lowest power loss and highest efficiency. The rectifier
diode must be rated to withstand reverse voltages greater
than the maximum VIN voltage.
The minimum average diode current rating (IDIODE(MAX)) is
calculated with maximum output current (IMAX),maximum
operational VIN, and output at the precondition threshold
(VBAT(PRE)):
I
IV
V
V
DIODE MAX
MAX
IN MAX
BAT PRE
IN MA
()
()
(
)
(
>
()
X
X
A
)
()
For example, a rectifier diode for a 4.2V, 1.5A charger with
a 20V maximum input voltage would require:
Ior
I
DIODE MAX
DIODE MAX
()
()
.• (
. )
,:
>
>
15
20 29
20
1..3A
CLP: System Current Limit
The LT3650 contains a PowerPathTM control feature to
support multiple load systems. The charger adjusts output
current in response to a system load if overall input supply
current exceeds the programmed maximum value.
Maximum input supply current is set by choosing a sense
resistor (RCLP) such that the desired maximum current
through that sense resistor creates a 50mV drop, or:
R
I
CLP
MAX IN
=
005
.
()
where IMAX(IN)isthemaximuminputcurrent.A1.5Asystem
limit, for example, would use a 33m
Ω sense resistor.
The LT3650 integrates the CLP signal internally, so average
current limiting is performed in most cases without the
need for external filter elements.
APPLICATIONS INFORMATION
Figure 4. RCLP Sets the Input Supply Current Limit
365042 F04
CLP
SYSTEM LOAD
INPUT SUPPLY
VIN
RCLP
LT3650
365042 F05
0.5A
1.0A
1.5A
LT3650 INPUT
CURRENT (IVIN)
SYSTEM LOAD
CURRENT
Figure 5. CLP Limit: Charger Current vs
System Load Current with 1.5A Limit
PowerPath is a trademark of Linear Technology Corporation.


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