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LT1941 数据表(PDF) 15 Page - Linear Technology

部件名 LT1941
功能描述  Triple Monolithic Switching Regulator
Download  24 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LT1941 数据表(HTML) 15 Page - Linear Technology

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LT1941
1941f
APPLICATIO S I FOR ATIO
can handle at least 1.5A of current without saturating and
ensure that the inductor has a low DCR (copper-wire re-
sistance) to minimize I2R power losses. If using uncoupled
inductors, each inductor need only handle one-half of the
total switch current so that 0.75A per inductor is sufficient.
A 4.7
µH to 15µH coupled inductor or two 15µH to 20µH
uncoupled inductors will usually be the best choice for most
LT1941 inverter designs. A 4.7
µHto15µHinductorwillbe
the best choice for most LT1941 boost designs. In this case,
the single inductor must carry the entire 1.5A peak switch
current.
Diode Selection
A Schottky diode is recommended for use with the LT1941
inverter/boost regulator. The Microsemi UPS120 is a very
good choice. Where the input to output voltage differential
exceeds 20V, use the UPS140 (a 40V diode). These diodes
are rated to handle an average forward current of 1A. For
applications where the average forward current of the
diode is less than 0.5A, use an ON Semiconductor
MBR0520L diode. The load current for boost, SEPIC and
inverting configurations is equal to the average diode
current.
BIAS2 Pin Considerations
The BIAS2 pin provides the drive current for the inverter/
boost switch. The voltage source on the BIAS2 line should
be able to supply the rated current and be at a minimum
of 2.5V. For highest efficiency, use the lowest voltage
source possible (VOUT = 3.3V, for example) to minimize
the VBIAS2 • IBIAS2 power loss inside the part.
INPUT CAPACITOR SELECTION
Bypass the input of the LT1941 circuit with a 10
µForhigher
ceramic capacitor of X7R or X5R type. A lower value or a
less expensive Y5V type will work if there is additional
bypassing provided by bulk electrolytic capacitors, or if the
input source impedance is low. The following paragraphs
describe the input capacitor considerations in more detail.
Step-down regulators draw current from the input supply
in pulses with very fast rise and fall times. The input ca-
pacitor is required to reduce the resulting voltage ripple at
the LT1941 input and to force this switching current into
a tight local loop, minimizing EMI. The input capacitor
must have low impedance at the switching frequency to do
this effectively and it must have an adequate ripple current
rating. With two switchers operating at the same frequency
but with different phases and duty cycles, calculating the
input capacitor RMS current is not simple; however, a
conservative value is the RMS input current for the chan-
nel that is delivering the most power (VOUT times IOUT):
CI
VV
V
V
I
IN RMS
OUT
OUT
IN
OUT
IN
OUT
()
=
()
<
2
Table 4. Inductors
VALUE
ISAT(DC)
DCR
HEIGHT
PART NUMBER
(
µH)
(A)
(
Ω)
(mm)
Coiltronics
TP3-4R7
4.7
1.5
0.181
2.2
TP4-100
10
1.5
0.146
3.0
Sumida
CD73-100
10
1.44
0.080
3.5
CDRH5D18-6R2
6.2
1.4
0.071
2.0
CDRH5D28-100
10
1.3
0.048
3.0
CDRH4D28-100
10
1.0
0.095
3.0
Coilcraft
D03314-103
10
0.8
0.520
1.4
1008PS-103
10
0.78
0.920
2.8
Output Capacitor Selection
Use low ESR (equivalent series resistance) capacitors at
the output to minimize the output ripple voltage. Multi-
layer ceramic capacitors are an excellent choice; they
have an extremely low ESR and are available in very small
packages. X7R dielectrics are preferred, followed by X5R,
as these materials retain their capacitance over wide
voltage and temperature ranges. A 4.7
µF to 20µF output
capacitor is sufficient for most LT1941 applications. Solid
tantalum or OS-CON capacitors will work but they will
occupy more board area and will have a higher ESR than
a ceramic capacitor. Always use a capacitor with a suffi-
cient voltage rating.


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