- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄362798 > EV2309DS-00A (Monolithic Power Systems, Inc.) 1A, 23V, 340KHz Synchronous Rectified Step-Down Converter PDF資料下載
參數(shù)資料
| 型號(hào)： | EV2309DS-00A |
| 廠商： | Monolithic Power Systems, Inc. |
| 英文描述： | 1A, 23V, 340KHz Synchronous Rectified Step-Down Converter |
| 中文描述： | 第1A，為23V，340KHz的同步整流降壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 344K |
| 代理商： | EV2309DS-00A |
MP2309 – 1A, 23V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER
MP2309 Rev. 1.4
3/13/2006
www.MonolithicPower.com
6
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
TM
APPLICATIONS INFORMATION
COMPONENT SELECTION
Setting the Output Voltage
The output voltage is set using a resistive
voltage divider from the output voltage to FB
pin. The voltage divider divides the output
voltage down to the feedback voltage by the
ratio:
2
R
1
R
2
R
+
V
V
OUT
FB
=
Thus the output voltage is:
2
R
2
R
1
R
923
.
V
OUT
+
×
=
Where V
OUT
is the output voltage and V
FB
is
the feedback voltage.
R2 can be as high as 100k
, but a typical
value is 10k
. Using the typical value for R2,
R1 is determined by:
)
923
.
V
(
87
.
10
1
R
OUT
×
=
For example, for a 3.3V output voltage, R2 is
10k
, and R1 is 26.1k
.
Table 1 lists recommended resistor values.
Table1—Recommended Resistors
VOUT
1.8V
2.5V
3.3V
5V
12V
R1
R2
10k
10k
10k
10k
10k
9.53k
16.9k
26.1k
44.2
121k
Inductor
The inductor is required to supply constant
current to the output load while being driven
by the switched input voltage. A larger value
inductor will result in less ripple current that
will result in lower output ripple voltage.
However, the larger value inductor will have a
larger physical size, higher series resistance,
and/or lower saturation current. A good rule
for determining the inductance to use is to
allow the peak-to-peak ripple current in the
inductor to be approximately 30% of the
maximum switch current limit. Also, make
sure that the peak inductor current is below
the maximum switch current limit. The inductance
value can be calculated by:
×
×
=
IN
OUT
V
S
OUT
V
V
1
L
f
L
Where V
IN
is the input voltage, f
S
is the switching
frequency, and
I
L
is the peak-to-peak inductor
ripple current.
Choose an inductor that will not saturate under
the maximum inductor peak current. The peak
inductor current can be calculated by:
×
×
×
+
=
IN
OUT
V
S
OUT
f
LOAD
I
LP
I
V
1
L
2
V
Where I
LOAD
is the load current.
The choice of which style inductor to use mainly
depends on the price vs. size requirements and
any EMI requirements.
Optional Schottky Diode
During the transition between high-side switch
and low-side switch, the body diode of the low-
side power MOSFET conducts the inductor
current. The forward voltage of this body diode is
high. An optional Schottky diode may be
paralleled between the SW pin and GND pin to
improve overall efficiency. Table 2 lists example
Schottky diodes and their Manufacturers.
Table 2—Diode Selection Guide
Part Number
B130
SK13
MBRS130
Voltage/Current
Rating
30V, 1A
30V, 1A
30V, 1A
Vendor
Diodes, Inc.
Diodes, Inc.
International
Rectifier
Input Capacitor
The input current to the step-down converter is
discontinuous, therefore a capacitor is required to
supply the AC current to the step-down converter
while maintaining the DC input voltage. Use low
ESR capacitors for the best performance.
Ceramic capacitors are preferred, but tantalum or
low-ESR electrolytic capacitors may also suffice.
Choose X5R or X7R dielectrics when using
ceramic capacitors.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| EV2351DQ-00A | 1.5A, 23V, 1.4MHz Step-Down Converter |
| EV2354DS-00A | 2A, 23V, 380KHz Step-Down Converter |
| EV2355DN-00A | 3A, 23V, 380KHz Step-Down Converter |
| EV2358DQ-00A | 2A, 23V, 370KHz Step-Down Converter |
| EV2358DS-00A | 2A, 23V, 370KHz Step-Down Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EV230PDR | 制造商:Schneider Electric 功能描述:O/D EV CHRG STATION PEDESTAL DUAL LVL 2/30 |
| EV2351DQ-00A | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:4.75V to 23V Input, 1.5A Output Step-Down DC/DC Converter |
| EV2354DS-00A | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:2A, 23V, 380KHz Step-Down Converter |
| EV2355DN-00A | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:3A, 23V, 380KHz Step-Down Converter |
| EV2358DQ-00A | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:2A, 23V, 370KHz Step-Down Converter Evaluation Board |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。