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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 7/14頁 |
| 文件大?。?/td> | 355K |
| 代理商： | TC115301EMTTR |
2003 Microchip Technology Inc.
DS21361C-page 7
TC115
Rewriting in terms of input and output currents and volt-
ages:
EQUATION 5-5:
Solving for input current:
EQUATION 5-6:
The sawtooth current is centered on the DC current
level, swinging equally above and below the DC current
calculated in Equation 5-6. The peak inductor current is
the sum of the DC current plus half the ac current. Note
that minimum input voltage should be used when
calculating the ac inductor current (Equation 5-9).
EQUATION 5-7:
EQUATION 5-8:
EQUATION 5-9:
Combining the DC current calculated in Equation 5-6,
with half the peak ac current calculated in Equation 5-9,
the peak inductor current is given by:
EQUATION 5-10:
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
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.
Failure to observe this will result in damage to the
regulator.
5.4
Output Capacitor
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
components and suppliers.
lists
suggested
5.5
Board Layout Guidelines
As with all inductive switching regulators, the TC115
generates fast switching waveforms which radiate
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.
TABLE 5-1:
SUGGESTED COMPONENTS AND SUPPLIERS
V
IN
MIN
(
)
I
IN
MAX
(
)
V
MAX
Efficiency
---------------------------- I
OUT
MAX
(
)
=
I
IN
MAX
V
MAX
Efficiency
OUT
MAX
)
V
IN
MIN
(
)
)
(
---------------------------- I
=
V
L
L di dt
)
=
di
V
L
di dt
(
)
=
di
V
MIN
--------------------–
V
L
(
)
t
ON
=
Where:
V
SW
= The voltage drop across the internal
N-channel MOSFET.
I
PK
I
IN
MAX
0.5
di
(
)
+
=
Type
Inductors
Capacitors
Diodes
Surface Mount
Sumida
CD54 Series
CDR125 Series
Coiltronics
CTX Series
Matsuo
267 Series
Sprague
595D Series
Nichicon
F93 Series
Nihon
EC10 Series
Matsushita
MA735 Series
Through-Hole
Sumida
RCH855 Series
RCH110 Series
Renco
RL1284-12
Sanyo
OS-CON Series
Nichicon
PL Series
ON Semiconductor
1N5817 - 1N5822
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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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