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參數(shù)資料
| 型號： | LT3757MPMSE#TRPBF |
| 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 |
| 文件頁數(shù)： | 18/36頁 |
| 文件大?。?/td> | 436K |
| 代理商： | LT3757MPMSE#TRPBF |
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LT3757
25
3757fc
Inverting Converter: Switch Duty Cycle and Frequency
For an inverting converter operating in CCM, the duty
cycle of the main switch can be calculated based on the
negative output voltage (VOUT)andtheinputvoltage(VIN).
Themaximumdutycycle(DMAX)occurswhentheconverter
has the minimum input voltage:
DMAX =
VOUT VD
VOUT VD VIN(MIN)
Inverting Converter: Inductor, Sense Resistor, Power
MOSFET, Output Diode and Input Capacitor Selections
The selections of the inductor, sense resistor, power
MOSFET, output diode and input capacitor of an inverting
converteraresimilartothoseoftheSEPICconverter.Please
refer to the corresponding SEPIC converter sections.
Inverting Converter: Output Capacitor Selection
The inverting converter requires much smaller output
capacitors than those of the boost, flyback and SEPIC
converters for similar output ripples. This is due to the fact
that, in the inverting converter, the inductor L2 is in series
with the output, and the ripple current flowing through the
outputcapacitorsarecontinuous.Theoutputripplevoltage
is produced by the ripple current of L2 flowing through
the ESR and bulk capacitance of the output capacitor:
VOUT(P–P) = IL2 ESRCOUT +
1
8 f COUT
After specifying the maximum output ripple, the user can
select the output capacitors according to the preceding
equation.
The ESR can be minimized by using high quality X5R or
X7R dielectric ceramic capacitors. In many applications,
ceramic capacitors are sufficient to limit the output volt-
age ripple.
The RMS ripple current rating of the output capacitor
needs to be greater than:
IRMS(COUT) > 0.3 IL2
Inverting Converter: Selecting the DC Coupling Capacitor
The DC voltage rating of the DC coupling capacitor (CDC,
as shown in Figure 10) should be larger than the maximum
input voltage minus the output voltage (negative voltage):
VCDC > VIN(MAX) – VOUT
CDC has nearly a rectangular current waveform. During
the switch off-time, the current through CDC is IIN, while
approximately –IO flows during the on-time. The RMS
rating of the coupling capacitor is determined by the fol-
lowing equation:
IRMS(CDC) >IO(MAX)
DMAX
1
DMAX
A low ESR and ESL, X5R or X7R ceramic capacitor works
well for CDC.
applicaTions inForMaTion
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