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參數(shù)資料
| 型號： | RC5041M |
| 廠商： | Raytheon Company |
| 元件分類： | DC/DC變換器 |
| 英文描述： | Programmable DC-DC Converter for Pentium P55C, K6 and 6x86MX (M2) Processors |
| 中文描述： | 可編程DC - DC轉(zhuǎn)換為奔騰P55C，K6和6x86MX量（M2）處理器 |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 119K |
| 代理商： | RC5041M |
RC5041
PRODUCT SPECIFICATION
6
P
Application Information
Simple Step-Down Converter
Figure 3. Simple Buck DC-DC Converter
Figure 3 illustrates a step-down DC-DC converter with no
feedback control. The derivation of the basic step-down
converter will serve as a basis for the design equations for
the RC5041. Referring to Figure 3, the basic operation
begins by closing the switch S1. When S1 is closed, the input
voltage V
IN
is impressed across inductor L1. The current
flowing in this inductor is given by the following equation:
Where T
ON
is the duty cycle (the time when S1 is closed).
When S1 opens, the diode D1 will conduct the inductor
current and the output current will be delivered to the load
according to the equation:
Where T
S
is the overall switching period, and (T
S
– T
ON
) is
the time during which S1 is open.
By solving these two equations, we can arrive at the basic
relationship for the output voltage of a step-down converter:
C1
R
L
Vout
+
–
D1
V
IN
65-5041-05
L1
S1
I
L
V
------------------L1
V
–
(
)
T
ON
=
I
L
V
T
-------------------------------------------
T
–
(
)
L1
=
V
OUT
V
IN
T
T
S
----------
=
In order to obtain a more accurate approximation for V
OUT
,
we must also include the forward voltage V
D
across diode
D1 and the switching loss, Vsw. After taking into account
these factors, the new relationship becomes:
Overview
The RC5041 is a programmable DC-DC controller IC.
When designed around the appropriate external components,
the RC5041 can be configured to deliver more than 14.5A of
output current. During heavy loading conditions, the
RC5041 functions as a current-mode PWM step-down regu-
lator. Under light loads, the regulator functions in the PFM
(pulse frequency modulation), or pulse skipping mode. The
controller will sense the load level and switch between the
two operating modes automatically, thus optimizing its effi-
ciency under all loading conditions.
Figure 4. Typical Switching Waveforms
V
OUT
V
IN
V
D
V
SW
–
+
(
)
T
S
-T
V
D
–
=
PWM/PFM
Control
+5V
VCCQP
HIDRV
GNDP
VO
OSCILLATOR
CEXT
CEXT
A
HIDRV
I
LOAD
A
B
B
C
C
D
D
E
E
65-5041-06
Figure 2. Output Driver Test Circuit
+12V
+5V
0.1
μ
F
0.1
μ
F
47
4.7
μ
F
VCCQP
VCCA
HIDRV
RISE/FALL
HIDRV
7000pF
1
μ
F
90%
50%
t
R
t
F
10%
65-5041-04
90%
50%
10%
RC5041
VCCD
GNDA
GNDD
GNDP
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| RC5042 | 制造商:RAYTHEON 制造商全稱:RAYTHEON 功能描述:Programmable DC-DC Converter |
| RC5042M | 制造商:RAYTHEON 制造商全稱:RAYTHEON 功能描述:Programmable DC-DC Converter |
| RC5042MT | 制造商:RAYTHEON 功能描述:* |
| RC5043 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| RC5043M | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current-Mode SMPS Controller |
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