參數(shù)資料
型號(hào)： LT1941EFE
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： Triple Monolithic Switching Regulator
中文描述： 6 A SWITCHING REGULATOR, 1350 kHz SWITCHING FREQ-MAX, PDSO28
封裝： 4.40 MM, PLASTIC, TSSOP-28
文件頁(yè)數(shù)： 14/24頁(yè)
文件大?。?/td> 336K
代理商： LT1941EFE
14
LT1941
1941f
APPLICATIOU
Converter with Backup Output Regulator
There is another situation to consider in systems where
the output will be held high when the input to the LT1941
is absent. If the V
IN
and one of the RUN/SS pins are allowed
to float, then the LT1941’s internal circuitry will pull its
quiescent current through its SW pin. This is acceptable if
the system can tolerate a few mA of load in this state. With
both RUN/SS pins grounded, the LT1941 enters shut-
down mode and the SW pin current drops to ~50mA.
However, if the V
IN
pin is grounded while the output is held
high, then parasitic diodes inside the LT1941 can pull large
currents from the output through the SW pin and the V
IN
pin. A Schottky diode in series with the input to the
LT1941, as shown in Figure 4, will protect the LT1941 and
the system from a shorted or reversed input.
W
U
U
Regulating Negative Output Voltages
The LT1941 contains an inverting op-amp with its nonin-
verting terminal tied to ground and its output connected to
the FB3 pin. Use this op-amp to generate a voltage at FB3
that is proportional to V
OUT
. Choose the resistors accord-
ing to:
R
R
V
V
OUT
4
3
1 24
.
=
Figure 4. Diode D4 Prevents a Shorted Input from
Discharging a Backup Battery Tied to the Output
V
IN
V
IN
V
OUT
SW
LT1941
D4
PARASITIC DIODE
1941 F04
FB3
R3
R4
1941 AI01
V
OUT
NFB
FB3
R4
R3
1941 AI02
–V
OUT
INVERTER/BOOST CONSIDERATIONS
Regulating Positive Output Voltages
The output voltage is programmed with a resistor divider
between the output and the FB pin. Choose the resistors
according to:
R
R
V
1 25
.
V
OUT
3
4
1
=
–
R4 should be 10k or less to avoid bias current errors.
NFB should be tied to FB3.
Use 10k or larger, up to 20k for R3.
Duty Cycle Range
The maximum duty cycle (DC) of the LT1941 inverter/
boost regulator is 77%. The duty cycle for a given applica-
tion using the inverter topology is:
DC
V
+
V
V
OUT
IN
OUT
=
The duty cycle for a given application using the boost
topology is:
DC
V
V
V
OUT
IN
OUT
=
–
The LT1941 can still be used in applications where the DC,
as calculated above, is above 77%; however, the part must
be operated in discontinuous mode so that the actual duty
cycle is reduced.
Inductor Selection
Several inductors that work well with the LT1941 inverter/
boost regulator are listed in Table 4. Besides these, many
other inductors will work. Consult each manufacturer for
detailed information and for their entire selection of related
parts. Use ferrite core inductors to obtain the best effi-
ciency. When using coupled inductors, choose one that
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