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| 型号： | LTC1871IMS#TRPBF-1 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | LEAD FREE, PLASTIC, MSOP-10 |
| 文件页数： | 17/36页 |
| 文件大小： | 354K |
| 代理商： | LTC1871IMS#TRPBF-1 |
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24
LTC1871-1
18711fa
SEPIC Converter Applications
The LTC1871-1 is also well suited to SEPIC (single-ended
primary inductance converter) converter applications. The
SEPIC converter shown in Figure 16 uses two inductors.
The advantage of the SEPIC converter is the input voltage
may be higher or lower than the output voltage, and the
output is short-circuit protected.
The first inductor, L1, together with the main switch,
resembles a boost converter. The second inductor, L2,
together with the output diode D1, resembles a flyback or
buck-boost converter. The two inductors L1 and L2 can be
independent but can also be wound on the same core since
identical voltages are applied to L1 and L2 throughout the
switching cycle. By making L1 = L2 and winding them on
the same core the input ripple is reduced along with cost
and size. All of the SEPIC applications information that
follows assumes L1 = L2 = L.
SEPIC Converter: Duty Cycle Considerations
For a SEPIC converter operating in a continuous conduc-
tion mode (CCM), the duty cycle of the main switch is:
D
VV
V
OD
IN
O
D
=
+
++
where VD is the forward voltage of the diode. For convert-
ers where the input voltage is close to the output voltage
the duty cycle is near 50%.
The maximum output voltage for a SEPIC converter is:
VV
V
D
V
D
O MAX
IN
D
MAX
D
MAX
()
–
=+
()
1
The maximum duty cycle of the LTC1871-1 is typically
92%.
SEPIC Converter: The Peak and Average
Input Currents
The control circuit in the LTC1871-1 is measuring the
input current (either using the RDS(ON) of the power
MOSFET or by means of a sense resistor in the MOSFET
source), so the output current needs to be reflected back
to the input in order to dimension the power MOSFET
properly. Based on the fact that, ideally, the output power
is equal to the input power, the maximum input current for
a SEPIC converter is:
II
D
The peak input current is
II
D
IN MAX
O MAX
MAX
IN PEAK
O MAX
MAX
()
(
)
–
:
–
=
=+
1
21
χ
The maximum duty cycle, DMAX, should be calculated at
minimum VIN.
APPLICATIO S I FOR ATIO
WU
UU
Figures 17. SEPIC Converter Switching Waveforms
17a. Input Inductor Current
IIN
IL1
SW
ON
SW
OFF
17b. Output Inductor Current
IO
IL2
17c. DC Coupling Capacitor Current
IO
IIN
IC1
17e. Output Ripple Voltage
VOUT
(AC)
ΔVESR
RINGING DUE TO
TOTAL INDUCTANCE
(BOARD + CAP)
ΔVCOUT
17d. Diode Current
IO
ID1
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