|
|
PDF EV1543 Data sheet ( Hoja de datos )
| Número de pieza | EV1543 | |
| Descripción | 500KHz Synchronous Rectified Step-up Converter | |
| Fabricantes | Monolithic Power Systems | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de EV1543 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
|
No Preview Available !
TM
The Future of Analog IC Technology TM
DESCRIPTION
The MP1543 is a highly efficient, synchronous,
fixed frequency, current-mode step-up converter
with output to input disconnect, inrush current
limiting and internal soft-start. It includes an error
amplifier, ramp generator, comparator, N-Channel
switch and P-Channel synchronous rectified
switch (which greatly improves efficiency). The
output disconnect feature allows the output to be
completely isolated from the input in shutdown
mode.
The 500KHz switching frequency allows for
smaller external components producing a
compact solution for a wide range of load
currents. The internal compensation and soft-start
minimizes the external component count and
limits the inrush current during startup. The
MP1543 regulates the output voltage up to 6V
and provides up to 400mA from a 2-cell AA with
a 3.3V output.
The MP1543 is offered in a thin SOT23-5
package.
EVALUATION BOARD REFERENCE
Board Number
EV1543DJ-01A
www.DataSheet4U.com
Dimensions
2.4”X x 2.4”Y x 0.4”Z
TYPICAL APPLICATION
VIN
1.8V - 3.2V
EN
5
EN
4
SW 3
OUT
MP1543
GND
2
1
FB
MP1543
1.5A, 500KHz Synchronous
Rectified Step-up Converter
FEATURES
• Over 90% Efficiency
• Output to Input Disconnect at Shutdown Mode
• Internal Synchronous Rectifier
• Inrush Current Limiting and Internal Soft-Start
• Internal Compensation
• 1.5A Typical Switch Current Limit
• 500KHz Fixed Switching Frequency
• Zero Current Shutdown Mode
• Thermal Shutdown
• 5-Pin TSOT-23 Package
APPLICATIONS
• MP3 Players
• Handheld Computers and PDAs
• Digital Still and Video Cameras
• External Modems
• Small LCD Displays
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
VOUT
3.3V
400mA
Efficiency vs
Load Current
100 VIN=3V
90
80
70 VIN=2.4V
60 VIN=1.8V
50
40 VOUT=3.3V
30
1
10 100 1000
LOAD CURRENT (mA)
MP1543-EC01
MP1543 Rev. 1.0
1/11/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
1
1 page  
TM
MP1543 — 1.5A, 500KHZ SYNCHRONOUS RECTIFIED STEP-UP CONVERTER
OPERATION
UVLO
REFERENCE VOLTAGE
BIAS CURRENT
THERMAL SHUTDOWN
EN
OUT
OSC
500KHz
RAMP
CONTROL
LOGIC
SW
+
PWM
COMPARATOR
CURRENT
SENSE
AMPLIFIER
ERROR
AMPLIFIER
RS
1.2V
GND
FB
MP1543_BD01
Figure 1—Functional Block Diagram
The MP1543 uses a 500KHz fixed-frequency,
current-mode regulation architecture to regulate
the output voltage. The MP1543 measures the
output voltage through an external resistive
voltage divider and compares that to the
internal 1.2V reference to generate the error
voltage. The current-mode regulator compares
the error voltage to the inductor current to
regulate the output voltage. The use of
current-mode regulation improves transient
www.DaretasSpheoent4sUe.caomnd control loop stability.
When the MP1543 is disabled (EN = Low), both
power switches are off. The body of the
P-Channel MOSFET connects to SW and there
is no current path from SW to OUT. Therefore,
the output voltage discharges to ground. When
the MP1543 is enabled (EN = High), the body of
the P-Channel MOSFET connects to OUT and
forms a forward diode from SW to OUT. Thus
the output voltage rises up toward the input
voltage. When output voltage crosses 1.6V the
MP1543 starts the controller and regulates the
output voltage to the target value.
At the beginning of each cycle, the N-Channel
MOSFET switch is turned on, forcing the
inductor current to rise. The current at the
source of the switch is internally measured and
converted to a voltage by the current sense
amplifier. That voltage is compared to the error
voltage. When the inductor current rises
sufficiently, the PWM comparator turns off the
switch, forcing the inductor current to the output
capacitor through the internal P-Channel
MOSFET rectifier, which forces the inductor
current to decrease. The peak inductor current
is controlled by the error voltage, which in turn
is controlled by the output voltage. Thus the
output voltage controls the inductor current to
satisfy the load.
Soft-Start
The MP1543 includes a soft-start timer that
limits the voltage at the error amplifier output
during startup to prevent excessive current at
the input. This prevents premature termination
of the source voltage at startup due to inrush
current. This also limits the inductor current at
startup, forcing the input current to rise slowly to
the amount required to regulate the output
voltage during soft-start.
MP1543 Rev. 1.0
1/11/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet EV1543.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| EV1541DJ-00A | 4 Output DSL Power Supply |  MPS |
| EV1541DJ-TFT-00A | TFT Applications Evaluation Board | MPS |
| EV1542DK-00A | Boost Converter | MPS |
| EV1542DK-SEPIC-00A | Boost Converter | MPS |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |