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參數(shù)資料
| 型號： | TC1313-MG2EUN |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.5 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 13/32頁 |
| 文件大?。?/td> | 591K |
| 代理商： | TC1313-MG2EUN |
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TC1313
DS21974B-page 20
2009 Microchip Technology Inc.
5.5
Inductor Selection
For
most
applications,
a
4.7 H
inductor
is
recommended to minimize noise. There are many
different magnetic core materials and package options
to select from. That decision is based on size, cost and
acceptable radiated energy levels. Toroid and shielded
ferrite pot cores will have low radiated energy but tend
to be larger and more expensive. With a typical
2.0 MHz switching frequency, the inductor ripple
current can be calculated based on the following
formulas.
EQUATION 5-2:
Duty cycle represents the percentage of switch-on
time.
EQUATION 5-3:
The inductor ac ripple current can be calculated using
the following relationship:
EQUATION 5-4:
Solving for
ΔIL = yields:
EQUATION 5-5:
When considering inductor ratings, the maximum DC
current rating of the inductor should be at least equal to
the maximum buck regulator load current (IOUT1), plus
one half of the peak-to-peak inductor ripple current (1/
2*
ΔIL). The inductor DC resistance can add to the
buck converter I2R losses. A rating of less than 200 m
Ω
is recommended. Overall efficiency will be improved by
using lower DC resistance inductors.
TABLE 5-2:
TC1313 RECOMMENDED
INDUCTOR VALUES
5.6
Thermal Calculations
5.6.1
BUCK REGULATOR OUTPUT
(VOUT1)
The TC1313 is available in two different 10-pin
packages (MSOP and 3x3 DFN). By calculating the
power dissipation and applying the package thermal
resistance, (
θJA), the junction temperature is estimated.
The maximum continuous junction temperature rating
for the TC1313 is +125°C.
To quickly estimate the internal power dissipation for
the switching buck regulator, an empirical calculation
using measured efficiency can be used. Given the
measured efficiency (Section 2.0 “Typical Perfor-
), the internal power dissipation is
estimated below.
EQUATION 5-6:
The first term is equal to the input power (definition of
efficiency, POUT/PIN = Efficiency). The second term is
equal to the delivered power. The difference is internal
power dissipation. This estimate assumes that most of
the power lost is internal to the TC1313. There is some
percentage of power lost in the buck inductor, with very
little loss in the input and output capacitors.
DutyCycle
V
OUT
V
IN
-------------
=
T
ON
DutyCycle
1
F
SW
----------
×
=
Where:
FSW
=
Switching Frequency
V
L
ΔI
L
Δt
--------
×
=
Where:
VL
=
voltage across the inductor
(VIN – VOUT)
Δt
=
on-time of P-channel MOSFET
ΔI
L
V
L
------
Δt
×
=
Part
Number
Value
(H)
DCR
Ω
(max)
MAX
IDC (A)
Size
WxLxH (mm)
Coiltronics
SD10
2.2
0.091
1.35 5.2, 5.2, 1.0 max.
SD10
3.3
0.108
1.24 5.2, 5.2, 1.0 max.
SD10
4.7
0.154
1.04 5.2, 5.2, 1.0 max.
Coiltronics
SD12
2.2
0.075
1.80 5.2, 5.2, 1.2 max.
SD12
3.3
0.104
1.42 5.2, 5.2, 1.2 max.
SD12
4.7
0.118
1.29 5.2, 5.2, 1.2 max.
Sumida Corporation
CMD411
2.2
0.116
0.950 4.4, 5.8, 1.2 max.
CMD411
3.3
0.174 0.770 4.4, 5.8, 1.2 max.
CMD411
4.7
0.216 0.750 4.4, 5.8, 1.2 max.
Coilcraft
1008PS
4.7
0.35
1.0
3.8, 3.8, 2.74 max.
1812PS
4.7
0.11
1.15 5.9, 5.0, 3.81 max.
V
OUT1
I
OUT1
×
Efficiency
-------------------------------------
V
OUT1
I
OUT1
×
()
–
P
Dissipation
=
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TC1313-PP0EMF | 功能描述:低壓差穩(wěn)壓器 - LDO PWM LDO combo PG RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC1313-PP0EMFTR | 功能描述:低壓差穩(wěn)壓器 - LDO PWM LDO combo PG RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC1313-RD1EMF | 功能描述:低壓差穩(wěn)壓器 - LDO PWM/LDO combo RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC1313-RD1EMFTR | 功能描述:低壓差穩(wěn)壓器 - LDO PWM/LDO combo RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC1313-VD0EMF | 功能描述:低壓差穩(wěn)壓器 - LDO PWM LDO combo PG RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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