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參數(shù)資料
| 型號(hào)： | LTC3783IFE |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 4.40 MM, PLASTIC, TSSOP-16 |
| 文件頁數(shù)： | 9/24頁 |
| 文件大?。?/td> | 250K |
| 代理商： | LTC3783IFE |
LTC3783
17
3783fb
OPERATION
From a known power dissipated in the power MOSFET, its
junction temperature can be obtained using the following
formula:
TJ = TA + PFET θJA
The
θJA to be used in this equation normally includes the
θJC for the device plus the thermal resistance from the
case to the ambient temperature (
θCA). This value of TJ
can then be compared to the original, assumed value used
in the iterative calculation process.
Boost Converter: Output Diode Selection
To maximize efciency, a fast switching diode with low
forward drop and low reverse leakage is desired. The output
diode in a boost converter conducts current during the
switch off-time. The peak reverse voltage that the diode
must withstand is equal to the regulator output voltage.
The average forward current in normal operation is equal
to the output current, and the peak current is equal to the
peak inductor current.
II
I
D
D PEAK
L PEAK
OUT MAX
MA
()
–
== +
1
21
χ
X
The power dissipated by the diode is:
PD = IOUT(MAX) VD
and the diode junction temperature is:
TJ = TA + PD θJA
The
θJA to be used in this equation normally includes the
θJC for the device plus the thermal resistance from the
board to the ambient temperature in the enclosure.
Remember to keep the diode lead lengths short and to
observe proper switch-node layout (see Board Layout
Checklist) to avoid excessive ringing and increased
dissipation.
Boost Converter: Output Capacitor Selection
Contributions of ESR (equivalent series resistance), ESL
(equivalent series inductance) and the bulk capacitance
must be considered when choosing the correct component
for a given output ripple voltage. The effects of these three
parameters (ESR, ESL and bulk C) on the output voltage
ripple waveform are illustrated in Figure 9 for a typical
boost converter.
VOUT
(AC)
VESR
RINGING DUE TO
TOTAL INDUCTANCE
(BOARD + CAP)
VCOUT
3783 F09
Figure 9. Output Ripple Voltage
The choice of component(s) begins with the maximum
acceptable ripple voltage (expressed as a percentage of
the output voltage), and how this ripple should be divided
between the ESR step and the charging/discharging
ΔV.
For the purpose of simplicity we will choose 2% for the
maximum output ripple, to be divided equally between the
ESR step and the charging/discharging
ΔV.Thispercentage
ripple will change, depending on the requirements of the
application, and the equations provided below can easily
be modied.
For a 1% contribution to the total ripple voltage, the ESR
of the output capacitor can be determined using the fol-
lowing equation:
ESR
V
I
where
I
COUT
OUT
IN PEAK
<
=
001
1
.
:
()
++
χ
21
–
()
I
D
OUT MAX
MAX
For the bulk C component, which also contributes 1% to
the total ripple:
C
I
Vf
OUT
OUT MAX
OUT
>
()
.
001
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