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参数资料
| 型号： | TC115EV |
| 厂商： | Microchip Technology |
| 文件页数： | 6/14页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO FOR TC115 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步升 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 3V |
| 电流 - 输出： | 110mA |
| 输入电压： | 0.9 ~ 3V |
| 稳压器拓扑结构： | 升压 |
| 频率 - 开关： | 100kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | TC115 |
| 产品目录页面： | 668 (CN2011-ZH PDF) |
TC115
5.0
APPLICATIONS
The inductor value directly affects the output ripple
voltage. Equation 5-3 is derived as shown below, and
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.
can be used to calculate an inductor value, given the
required output ripple voltage (V RIPPLE ) and output
capacitor series resistance:
EQUATION 5-1:
V RIPPLE ≈ ESR ( di )
Where:
C 1
V IN
+
5 4
GND LX
TC115
NC PS SHDN
1 2 3
L 1
D 1
C 2 +
V OUT
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.
Expressing di in terms of switch ON resistance and
time:
[ ( V IN – V SW ) t ON ]
V RIPPLE ≈ --------------------------------------------
FIGURE 5-1:
OFF ON
(Tie to V IN or V OUT
if not used)
TC115 Typical Application.
EQUATION 5-2:
Where:
L
[ ( V IN – V SW ) t ON ]
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 ? ).
DS21361C-page 6
V SW = voltage drop across the switch.
T ON = the amount of time the switch is ON.
Solving for L:
EQUATION 5-3:
L ≈ --------------------------------------------
V RIPPLE
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:
Output Power
Input Power = ---------------------------------
Efficiency
? 2003 Microchip Technology Inc.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC115-PB-B | 制造商:Carling Technologies 功能描述:T-SERIES ROCKER SWITCH - Bulk |
| TC115-SC-1 | 制造商:Thomas & Betts 功能描述:1 1/2 CONN,COMP.,EMT,STL,EA |
| TC115-TB | 制造商:Thomas & Betts 功能描述:CABLE MOUNTING BLOCK .5X1" #10 BOLT 制造商:Thomas & Betts 功能描述:Cable Accessories Mounting Base Nylon 6.6 Natural |
| TC115-TB-B | 制造商:Carling Technologies 功能描述:T-SERIES ROCKER SWITCH - Bulk |
| TC115-TW-W | 制造商:Carling Technologies 功能描述:T-SERIES ROCKER SWITCH - Bulk |
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