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参数资料
| 型号： | TC1313-CN1EMFTR |
| 厂商： | Microchip Technology Inc. |
| 英文描述： | 500 mA Synchronous Buck Regulator, + 300 mA LDO |
| 中文描述： | 500毫安同步降压稳压器，300 mA的LDO |
| 文件页数： | 17/28页 |
| 文件大小： | 392K |
| 代理商： | TC1313-CN1EMFTR |
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2005 Microchip Technology Inc.
DS21974A-page 17
TC1313
5.5
Inductor Selection
For most applications, a 4.7 μH inductor is recom-
mended 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
Δ
I
L
= 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 (I
OUT1
), plus
one half of the peak-to-peak inductor ripple current
(1/2 *
Δ
I
L
). The inductor DC resistance can add to the
buck converter I
2
R 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
(V
OUT1
)
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, (
θ
JA
), 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-
mance Curves”
), the internal power dissipation is
estimated below.
EQUATION 5-6:
V
Efficiency
The first term is equal to the input power (definition of
efficiency, P
OUT
/P
IN
=
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
V
IN
-------------
=
T
ON
DutyCycle
F
SW
---------
×
=
Where:
F
SW
= Switching Frequency.
V
L
L
Δ
I
L
Δ
t
--------
×
=
Where:
V
L
= voltage across the inductor (V
IN
– V
OUT
)
Δ
t = on-time of P-channel MOSFET
Δ
I
L
V
L
L
-----
Δ
t
×
=
Part
Number
Value
(μH)
DCR
Ω
(
max)
MAX
I
DC
(A)
Size
WxLxH (mm)
Coiltronics
SD10
SD10
SD10
Coiltronics
SD12
SD12
SD12
Sumida Corporation
CMD411
CMD411
CMD411
Coilcraft
1008PS
1812PS
2.2
3.3
4.7
0.091
0.108
0.154
1.35
1.24
1.04
5.2, 5.2, 1.0 max.
5.2, 5.2, 1.0 max.
5.2, 5.2, 1.0 max.
2.2
3.3
4.7
0.075
0.104
0.118
1.80
1.42
1.29
5.2, 5.2, 1.2 max.
5.2, 5.2, 1.2 max.
5.2, 5.2, 1.2 max.
2.2
3.3
4.7
0.116
0.174
0.216
0.950 4.4, 5.8, 1.2 max.
0.770 4.4, 5.8, 1.2 max.
0.750 4.4, 5.8, 1.2 max.
4.7
4.7
0.35
0.11
1.0
1.15
3.8, 3.8, 2.74 max.
5.9, 5.0, 3.81 max.
-------------------------------------
V
OUT1
I
OUT1
×
(
)
–
P
Dissipation
=
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| TC1313-CN1EUNTR | 500 mA Synchronous Buck Regulator, + 300 mA LDO |
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| TC1313-CN2EMFTR | 500 mA Synchronous Buck Regulator, + 300 mA LDO |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC1313-DG0EMF | 功能描述:低压差稳压器 - LDO PWM/LDO combo RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| TC1313-DG0EMFTR | 功能描述:低压差稳压器 - LDO PWM/LDO combo RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| TC1313-PP0EMF | 功能描述:低压差稳压器 - LDO PWM LDO combo PG RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| TC1313-PP0EMFTR | 功能描述:低压差稳压器 - LDO PWM LDO combo PG RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| TC1313-RD1EMF | 功能描述:低压差稳压器 - LDO PWM/LDO combo RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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