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参数资料
| 型号： | TC115EV |
| 厂商： | Microchip Technology |
| 文件页数： | 7/14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
( V IN ) ( I IN ) = ---------------------------------------------------
Rewriting in terms of input and output currents and volt-
ages:
EQUATION 5-5:
( V O UT ) ( I O UT )
M AX MAX
M IN M AX Efficiency
Solving for input current:
5.3 Internal Transistor Switch
The LX pin has a typical ON resistance of 1.4 ? .
Therefore, peak switch current is given by (V IN /1.4).
The internal transistor switch has a maximum design
rating of 350 mA. An oscillator frequency doubling cir-
cuit is an included guard against high switching cur-
rents. Should the voltage on the LX pin rise above 1.3V
(max) while the internal N-channel switch is ON, the
= ----------------------------------------------------
EQUATION 5-6:
I IN MA X
( V OU T ) ( I O UT )
M AX M AX
( Efficiency ) ( V IN M IN )
oscillator frequency automatically doubles to minimize
ON time. Although reduced, switch current still flows
because the PWM remains in operation. Therefore, the
LX input is not internally current-limited and care must
be taken never to exceed the 350 mA maximum limit.
The sawtooth current is centered on the DC current
level, swinging equally above and below the DC current
Failure to observe this will result in damage to the
regulator.
calculated in Equation 5-6. The peak inductor current is
the sum of the DC current plus half the ac current. Note
5.4
Output Capacitor
that minimum input voltage should be used when
calculating the ac inductor current (Equation 5-9).
EQUATION 5-7:
V L = L ( di ? dt )
EQUATION 5-8:
di = V L ( di ? dt )
EQUATION 5-9:
The effective series resistance of the output capacitor
directly affects the amplitude of the output voltage
ripple (The product of the peak inductor current and the
ESR determines output ripple amplitude). Therefore, a
capacitor with the lowest possible ESR should be
selected. Smaller capacitors are acceptable for light
loads (or in applications where ripple is not a concern).
The Sprague ? 595D series of tantalum capacitors are
among the smallest of all low ESR surface mount
capacitors available. Table 5-1 lists suggested
components and suppliers.
di = ----------------------------------------------
Where:
( V IN – V SW ) t ON
MIN
L
5.5 Board Layout Guidelines
As with all inductive switching regulators, the TC115
generates fast switching waveforms which radiate
V SW = The voltage drop across the internal
N-channel MOSFET.
the peak inductor current is given by:
EQUATION 5-10:
noise. Interconnecting lead lengths should be
minimized to keep stray capacitance, trace resistance
and radiated noise as low as possible. In addition, the
GND pin, input bypass capacitor and output filter
capacitor ground leads should be connected to a single
point.
I PK = I IN
MAX
+ 0.5 ( di )
TABLE 5-1:
SUGGESTED COMPONENTS AND SUPPLIERS
Sumida
Type
Surface Mount
Inductors
?
CD54 Series
CDR125 Series
Coiltronics?
CTX Series
Capacitors
Matsuo ?
267 Series
Sprague ?
595D Series
Nichicon?
Diodes
Nihon
EC10 Series
Matsushita?
MA735 Series
F93 Series
Through-Hole
Sumida ?
RCH855 Series
RCH110 Series
Renco ?
Sanyo?
OS-CON Series
Nichicon?
PL Series
ON Semiconductor ?
1N5817 - 1N5822
RL1284-12
? 2003 Microchip Technology Inc.
DS21361C-page 7
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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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