參數(shù)資料
型號(hào)： TC115301EMTTR
廠商： Microchip Technology Inc.
英文描述： PFM/PWM Step-Up DC/DC Converter
中文描述： 烤瓷/ PWM升壓型DC / DC轉(zhuǎn)換器
文件頁(yè)數(shù)： 6/14頁(yè)
文件大小： 355K
代理商： TC115301EMTTR
TC115
DS21361C-page 6
2003 Microchip Technology Inc.
5.0
APPLICATIONS
5.1
Input Bypass Capacitors
Using an input bypass capacitor reduces peak current
transients drawn from the input supply and reduces the
switching noise generated by the regulator. The source
impedance of the input supply determines the size of
the capacitor that should be used.
FIGURE 5-1:
TC115 Typical Application.
5.2
Inductor Selection
Selecting the proper inductor value is a trade-off
between physical size and power conversion require-
ments. Lower value inductors cost less, but result in
higher ripple current and core losses. They are also
more prone to saturate since the coil current ramps to
a higher value. Larger inductor values reduce both
ripple current and core losses, but are larger in physical
size and tend to increase the start-up time slightly.
Practical inductor values, therefore, range from 50 μH
to 300 μH. Inductors with a ferrite core (or equivalent)
are recommended. For highest efficiency, use an
inductor with a series resistance less than 0.1
).
The inductor value directly affects the output ripple
voltage. Equation 5-3 is derived as shown below, and
can be used to calculate an inductor value, given the
required output ripple voltage (V
RIPPLE
) and output
capacitor series resistance:
EQUATION 5-1:
Expressing
di
in terms of switch ON resistance and
time:
EQUATION 5-2:
Solving for L:
EQUATION 5-3:
Care must be taken to ensure the inductor can handle
peak switching currents, which can be several times
load currents. Exceeding rated peak current will result
in core saturation and loss of inductance. The inductor
should be selected to withstand currents greater than
I
PK
(Equation 5-10) without saturating.
Calculating the peak inductor current is straightfor-
ward. Inductor current consists of an AC (sawtooth)
current centered on an average DC current (i.e., input
current). Equation 5-6 calculates the average DC cur-
rent. Note that minimum input voltage and maximum
load current values should be used:
EQUATION 5-4:
C
1
L
1
5
GND
4
TC115
PS
1
3
2
SHDN
NC
C
2
D
1
LX
V
OUT
V
IN
OFF ON
(Tie to V
or V
OUT
if not used)
+
+
Where:
ESR: the equivalent series resistance of the
output filter capacitor; V
RIPPLE
is in
volts.
di: represents the peak to peak ripple
current in the inductor.
V
RIPPLE
ESR di
)
≈
V
RIPPLE
V
V
L
)
t
ON
--------------–
]
≈
Where:
V
SW
= voltage drop across the switch.
T
ON
= the amount of time the switch is ON.
L
V
V
–
(
)
t
[
-------------------------------------------
]
V
RIPPLE
≈
Input Power
Efficiency
Output Power
=
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TC115501ECT 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:PFM/PWM Step-Up DC/DC Converter
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TC115A 制造商:Thomas & Betts 功能描述:1 1/2" Compression Connector, Steel-Zinc Plated, Concrete tight 制造商:Thomas & Betts 功能描述:Fittings Connector 1.5inch Steel
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