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PDF MP2487 Data sheet ( Hoja de datos )
| Número de pieza | MP2487 | |
| Descripción | High Power LED Driver | |
| Fabricantes | MPS | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MP2487 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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The Future of Analog IC Technology
DESCRIPTION
The MP2487 is a fixed frequency step-down
switching regulator to deliver a constant current
of up to 1A to high power LEDs. It integrates a
high-side, high voltage power MOSFET with a
current limit of 1.5A. The wide 4.5V to 55V input
range accommodates a variety of step-down
applications, making it ideal for automotive,
industry and general lighting applications. Peak
current mode control and 200mV reference are
applied for fast loop response, easy
compensation and accurate LED current
regulation. The switching frequency is
programmable with an external resistor up to
200kHz, which can prevent EMI
(Electromagnetic Interference) noise problems.
The thermal shut down provides reliable, fault
tolerant operations. A 12µA quiescent current in
shutdown mode allows its use in battery-
powered applications.
The MP2487 is available in a SOIC8E package.
MP2487
55V, 1A
High Power LED Driver
FEATURES
• Wide 4.5V to 55V Operating Input Range
• 220mΩ Internal Power MOSFET
• Up to 200kHz Programmable Switching
Frequency
• 130μA Quiescent Current
• Ceramic Capacitor Stable
• Internal Soft-Start
• Up to 97.5% Efficiency
• 200mV Reference Voltage for High
Efficiency
• Available in a SOIC8E Package
APPLICATIONS
• High Power LED Driver
• Automotive, and General Lighting
• Constant Source
For MPS green status, please visit MPS website under Quality Assurance.
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
CCOM2
RCOM CCOM1
CONTROL
RFREQ
CFREQ LED-
RFB
COMP
VIN
MP2487
EN BST
FREQ
SW
FB GND
CIN
CBST
D1
L1
COUT
VIN
8V to 55V
LED+
Efficiency vs. Input Voltage
10 WLED@330mA
100
98
96
94
92
90
30 35 40 45 50 55 60
INPUT VOLTAGE(V)
MP2487 Rev. 1.0
9/22/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
1
1 page  
MP2487 – 55V, 1A, HIGH-POWER LEDS DRIVER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN=44V, ILED=330mA, 10 WLED series, unless otherwise noted.
Steady State Operation
PWM Dimming
fPWM=200Hz,DPWM=50%
EN Start Up
VSW
20V/div
VIN
20V/div
ILED
200mA/div
IINDUCTOR
200mA/div
4us/div
VEN
5V/div
VCOMP
500mV/div
VSW
20V/div
ILED
200mA/div
2ms/div
VEN
5V/div
VSW
50V/div
ILED
200mA/div
IINDUCTOR
200mA/div
EN Shutdown
VEN
5V/div
VSW
50V/div
ILED
200mA/div
IINDUCTOR
200mA/div
Efficiency vs. Input Voltage
10 WLED@330mA
100
98
96
94
92
90
30 35 40 45 50 55 60
INPUT VOLTAGE(V)
MP2487 Rev. 1.0
9/22/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
5
5 Page 
MP2487 – 55V, 1A, HIGH-POWER LEDS DRIVER
3. Determine if the second compensation
capacitor (CCOM2) is required, which is connected
from COMP pin to GND. It is required if the ESR
zero of the output capacitor is located at less
than half of the switching frequency:
1
2π × COUT
× RESR
<
fS
2
If this is the case, then add the second
compensation capacitor (CCOM2) to set the pole
fP3 at the location of the ESR zero. Determine the
CCOM2 value by the equation:
CCOM2
=
COUT × RESR
RCOM
External Bootstrap Diode
An external bootstrap diode may enhance the
efficiency of the regulator. In below cases, an
external BST diode is recommended from the 5V
to BST pin:
z There is a 5V rail available in the system;
z VIN is not greater than 5V;
z VOUT is between 3.3V and 5V;
The bootstrap diode can be a low cost one such
as IN4148 or BAT54.
5V
BST
MP2487
SW
0.1υF
Figure 2—External Bootstrap Diode
MP2487 Rev. 1.0
9/22/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MP2487.PDF ] | |
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