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LT3650IMSE-4.1 数据表(PDF) 12 Page - Linear Technology

部件名 LT3650IMSE-4.1
功能描述  High Voltage 2 Amp Monolithic Li-Ion Battery Charger
Download  20 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LT3650IMSE-4.1 数据表(HTML) 12 Page - Linear Technology

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LT3650-4.1/LT3650-4.2
12
36504142fb
RSENSE: Charge Current Programming
The LT3650 charger is configurable to charge at average
currents as high as 2A. Maximum charge current is set by
choosing an inductor sense resistor such that the desired
maximum average current through that sense resistor
creates a 100mV drop, or:
R
I
SENSE
MAX AVG
=
01
.
()
where IMAX(AVG) is the maximum average charge current.
A 2A charger, for example, would use a 0.05
Ω sense
resistor.
to 35% of IMAX, so an inductor value can be determined
by setting 0.25 <
ΔIMAX < 0.35.
Magnetics vendors typically specify inductors with
maximum RMS and saturation current ratings. Select an
inductor that has a saturation current rating at or above (1+
ΔIMAX/2) • IMAX, and an RMS rating above IMAX. Inductors
must also meet a maximum volt-second product require-
ment. If this specification is not in the data sheet of an
inductor, consult the vendor to make sure the maximum
volt-second product is not being exceeded by your design.
The minimum required volt-second product is:
V
V
V
Vs
BAT
BAT
IN MAX
••
()
1
()
μ
APPLICATIONS INFORMATION
Figure 1. Programming Maximum Charge Current Using RSENSE
365042 F01
SW
BOOST
SENSE
BAT
RSENSE
LT3650
MAXIMUM OPERATIONAL VIN VOLTAGE (V)
0
6
8
10
18
30
365042 F02
4
2
0
612
24
MAXIMUM OPERATIONAL VIN VOLTAGE (V)
0
16
18
30
365042 F03
12
8
4
612
24
Figure 2. 2A Charger Switched Inductor Value
(RSENSE = 0.05
Ω) 25% to 35% IMAX Ripple Current
Figure 3. 1.3A Charger Switched Inductor Value
(RSENSE = 0.075
Ω) 25% to 35% IMAX Ripple Current
Inductor Selection
The primary criteria for inductor value selection in an
LT3650 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 (
ΔIMAX)
can be approximated using the relation:
L
I
RV
V
VV
V
MAX
SENSE
BAT
F
BAT
F
=
⎝⎜
⎠⎟
+
()
+
10
1
Δ
••
IIN MAX
F
V
H
() +
()
μ
In the previous relation,
ΔIMAX is the normalized ripple
current, VIN(MAX) as the maximum operational voltage,
and VF is the forward voltage of the rectifying Schottky
diode. Ripple current is typically set within a range of 25%


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