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| 型號(hào)： | LT3758MPMSE#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 3 MM, LEAD FREE, PLASTIC, MSOP-10 |
| 文件頁(yè)數(shù)： | 14/36頁(yè) |
| 文件大?。?/td> | 554K |
| 代理商： | LT3758MPMSE#PBF |
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LT3758
21
3758fc
ApplicAtions inForMAtion
Flyback Converter: Input Capacitor Selection
The input capacitor in a flyback converter is subject to
a large RMS current due to the discontinuous primary
current. To prevent large voltage transients, use a low
ESR input capacitor sized for the maximum RMS current.
The RMS ripple current rating of the input capacitors in
discontinuous operation can be determined using the
following equation:
IRMS(CIN),DISCONTINUOUS ≥
POUT(MAX)
VIN(MIN) η
4
(3 DMAX)
3 DMAX
SEPIC CONVERTER APPLICATIONS
The LT3758 can be configured as a SEPIC (single-ended
primary inductance converter), as shown in Figure 1. This
topology allows for the input to be higher, equal, or lower
than the desired output voltage. The conversion ratio as
a function of duty cycle is:
VOUT + VD
VIN
=
D
1
D
in continuous conduction mode (CCM).
In a SEPIC converter, no DC path exists between the input
and output. This is an advantage over the boost converter
for applications requiring the output to be disconnected
from the input source when the circuit is in shutdown.
Compared to the flyback converter, the SEPIC converter
has the advantage that both the power MOSFET and the
output diode voltages are clamped by the capacitors (CIN,
CDC and COUT), therefore, there is less voltage ringing
across the power MOSFET and the output diodes. The
SEPIC converter requires much smaller input capacitors
than those of the flyback converter. This is due to the fact
that, in the SEPIC converter, the inductor L1 is in series
with the input, and the ripple current flowing through the
input capacitor is continuous.
SEPIC Converter: Switch Duty Cycle and Frequency
For a SEPIC converter operating in CCM, the duty cycle
of the main switch can be calculated based on the output
voltage (VOUT), the input voltage (VIN) and the diode
forward voltage (VD).
Themaximumdutycycle(DMAX)occurswhentheconverter
has the minimum input voltage:
DMAX =
VOUT + VD
VIN(MIN) + VOUT + VD
SEPIC Converter: Inductor and Sense Resistor Selection
As shown in Figure 1, the SEPIC converter contains two
inductors:L1andL2.L1andL2canbeindependent,butcan
also be wound on the same core, since identical voltages
are applied to L1 and L2 throughout the switching cycle.
For the SEPIC topology, the current through L1 is the
converter input current. Based on the fact that, ideally, the
output power is equal to the input power, the maximum
average inductor currents of L1 and L2 are:
IL1(MAX) = IIN(MAX) = IO(MAX)
DMAX
1
DMAX
IL2(MAX) = IO(MAX)
In a SEPIC converter, the switch current is equal to IL1 +
IL2 when the power switch is on, therefore, the maximum
average switch current is defined as:
ISW(MAX) =IL1(MAX) +IL2(MAX) =IO(MAX)
1
DMAX
and the peak switch current is:
ISW(PEAK) = 1+
χ
2
IO(MAX)
1
DMAX
The constant c in the preceding equations represents the
percentage peak-to-peak ripple current in the switch, rela-
tive to ISW(MAX), as shown in Figure 9. Then, the switch
ripple current ISW can be calculated by:
ISW = c ISW(MAX)
The inductor ripple currents IL1 and IL2 are identical:
IL1 = IL2 = 0.5 ISW
The inductor ripple current has a direct effect on the
choice of the inductor value. Choosing smaller values of
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