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參數(shù)資料
| 型號： | EV2355DN-00A |
| 廠商： | Monolithic Power Systems, Inc. |
| 英文描述： | 3A, 23V, 380KHz Step-Down Converter |
| 中文描述： | 第3A，為23V，380KHz降壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 4/10頁 |
| 文件大小： | 262K |
| 代理商： | EV2355DN-00A |
MP2355 – 3A, 23V, 380KHz STEP-DOWN CONVERTER
MP2355 Rev. 1.5
5/1/2006
www.MonolithicPower.com
4
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
TM
TYPICAL PERFORMANCE CHARACTERISTICS
(continued)
Circuit of Figure 2, V
IN
= 12V, V
O
= 3.3V, L1 = 15μH, C1 = 10μF, C2 = 22μF, T
A
= +25
°
C, unless
otherwise noted.
V
O, AC
200mV/div.
I
L
1A/div.
I
1A/div.
MP2355-TPC06
Load Transient
V
OUT
2V/div.
I
L
2A/div.
V
OUT
2V/div.
I
L
2A/div.
MP2355-TPC07
Short Circuit Protection
MP2355-TPC08
Short Circuit Recovery
PIN FUNCTIONS
Pin #
Name Description
1
SS
Soft-Start Control Input. SS controls the soft-start period. Connect a capacitor from SS to
GND to set the soft-start period. A 0.1μF capacitor sets the soft-start period to 10ms. To
disable the soft-start feature, leave SS unconnected.
High-Side Gate Drive Boost Input. BST supplies the drive for the high-side N-Channel
MOSFET switch. Connect a 10nF or greater capacitor from LX to BST to power the high
side switch.
Power Input. VIN supplies the power to the IC, as well as the step-down converter switches.
Drive VIN with a 4.75V to 23V power source. Bypass VIN to GND with a suitably large
capacitor to eliminate noise on the input to the IC. See
Input Capacitor
Power Switching Output. LX is the switching node that supplies power to the output.
Connect the output LC filter from LX to the output load. Note that a capacitor is required
from LX to BST to power the high-side switch.
Ground. (Note: Connect the exposed pad on backside to Pin 5.)
Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB with a
resistive voltage divider from the output voltage. The feedback threshold is 1.222V. See
Setting the Output Voltage
Compensation Node. COMP is used to compensate the regulation control loop. Connect a
series RC network from COMP to GND to compensate the regulation control loop. In some
cases, an additional capacitor from COMP to GND is required. See
Compensation
Enable/UVLO. A voltage greater than 2.71V enables operation. For complete low current
shutdown the EN pin voltage needs to be less than 900mV.
2
BST
3
VIN
4
LX
5
GND
6
FB
7
COMP
8
RUN
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