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PDF MP4001 Data sheet ( Hoja de datos )
| Número de pieza | MP4001 | |
| Descripción | Universal Input High Brightness White LED Driver | |
| Fabricantes | MPS | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MP4001 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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The Future of Analog IC Technology
MP4001
Universal Input High Brightness
White LED Driver
DESCRIPTION
The MP4001 is a high efficiency step-down
converter designed for driving the high
brightness Light Emitting Diodes (LEDs).
The MP4001 drives external MOSFET with
boundary conduction mode which features no
reverse recovery loss in the freewheeling diode,
soft turn on with zero-current and valley voltage
for the power MOSFET. Such operation mode
can achieve very high efficiency and in the
same time minimize the inductor value and size.
With the boundary conduction control mode, the
LED current can be well regulated by control
the MOSFET peak current which is sensed
through an external resistor. Its low 300mV
feedback voltage reduces power loss and
improves the efficiency.
The MP4001 integrates a high-voltage smart
LDO, which allows the AC input to power up the
IC directly. The smart LDO sinks current when
the input voltage is lower than 24V to achieve
higher efficiency.
The MP4001 implements both PWM and DC
input burst dimming The MP4001 features
output short protections, maximum switching
frequency limitation, under-voltage lockout and
thermal shut down.
FEATURES
• Constant-current LED Driver
• Universal AC Input (85VAC-305VAC)
• Power MOSFET Zero-Current Turn On
• High Efficiency Boundary Mode Operation
• Integrated High-voltage Smart LDO
• Low 1mA Operation Current
• PWM or DC Input Burst Dimming Control
• Hiccup Short Circuit Protection
• Maxim Frequency Limited to 110kHz
• Thermal Shutdown
• Available in SOIC8 Package
APPLICATIONS
• Non-Isolated Lighting
• General Illumination
• Industrial Lighting
• Automotive/ Decorative LED Lighting
• LCD TV Backlighting
• DC/DC or AC/DC LED Driver Applications
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
AC input
+
Cin Vbus
-
C1
DIM
CBOS
Vin
IN
VC C
MP4001
D R IVE
DIM
BOS
CS
GN D
LED s
D
Cout
+
Vout
-
L
Vsw
MOSFET
Q1
Rsense
MP4001 Rev. 1.02
www.MonolithicPower.com
1/9/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
1
1 page  
MP4001 – UNIVERSAL INPUT HIGH BRIGHTNESS WLED DRIVER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN =90-265VAC, VLED=10-30V, 3-9LEDS, ILED=350mA, TA = +25°C, unless otherwise noted.
-50 0 50 100 150
0 50 100 150
-50 0
50 100 150
0-50 0 50 100 150
-50 0 50 100 150
-50 0 50 100 150
MP4001 Rev. 1.02
www.MonolithicPower.com
1/9/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
5
5 Page 
MP4001 – UNIVERSAL INPUT HIGH BRIGHTNESS WLED DRIVER
MPS CONFIDENTIAL AND PROPRIETARY INFORMATION – INTERNAL USE ONLY
goes to zero. As a result, the average LED
current is well regulated as:
2.42V
fDIM
ILED
=
VREF
2R sense
VDIM
VBOS
The zero-current detection is realized at DRIVE
pin by sensing the MOSFET drain dv/dt current
through the Q1’s miller cap. When the current
of freewheeling diode goes to zero, Q1 drain
voltage (VSW) drops from VBUS to (VBUS -VOUT)
and starts oscillation caused by the inductor
and the parasitic caps. When VSW reaches the
minimum value, the dv/dt current through the
miller cap changes from negative to zero. At
this time, the MP4001 turns on Q1. As a result,
MP4001 turns on Q1 when the inductor current
goes to zero and Q1 drain voltage is at the
minimum. MP4001 controls the buck converter
operation in current boundary conduction mode.
It is usually recommended to add a 10pF cap
between the drain and source of Q1 to help for
the zero current detection.
A cap Cout can be used in parallel with the LED
string to reduce the current ripple.
Such boundary operation mode can minimize
the Q1 turn on loss and eliminate the
freewheeling diode reverse recovery loss so
that high switching frequency is possible to
reduce passive components’ size. Furthermore,
the required inductance value is small, which
can help further inductor size reduction.
VDRIVE
IL
Figure 4: DC Burst Dimming
For the PWM input dimming control, a 100Hz to
2kHz PWM signal is recommended to connect
to the DIM pin. BOS pin is connected to GND
through a 300kΩ resistor, setting about 1.2V
reference for the PWM input logic signal. PWM
input high will make the IC switching. PWM
input low turns off the IC.
While doing dimming, the dimming high signal
force the DRIVE signal high and the dimming
low signal force the DRIVE signal to low. There
will be a case that the dimming low interval is
too small for Inductor current reaching zero, the
CCM will be observed. So the rectifying diode
(D in Typical Application) must be Ultra-Fast
diode or Super-Fast diode.
VDIM
Brightness Dimming Control
MP4001 can employs a burst dimming control
scheme so that a DC signal can control the
dimming by varying the DC voltage level, or an
external PWM signal can control the dimming
by varying the duty cycle.
For the DC input dimming control, a voltage
from 0V to 2.42V is recommended to connect to
the DIM pin. 2.42V and above is for the 100%
brightness. 120mV and below is for the 5%
minimal brightness. A cap CBOS is connected
from BOS pin to GND to program the burst
frequency fDIM:
CBOS = iBOS/(VBOSH x fDIM)
VDRIVE
IL CCM
Figure 5: CCM in Large Dimming Duty
For application that do not need burst dimming
control, open DIM pin and short BOS pin to
GND
Frequency Setting and Inductor Design
In case the zero-current detection circuit fails,
which can happens in start up with a large
output cap and in output short condition, a
maximum off time of about 1.7ms is applied to
make sure MP4001 is still in operation and the
short current doesn’t run away.
MP4001 Rev 1.02
1/9/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MP4001.PDF ] | |
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