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PDF MP4700 Data sheet ( Hoja de datos )
| Número de pieza | MP4700 | |
| Descripción | High-Brightness BCM Low Side Buck White LED Driver | |
| Fabricantes | MPS | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MP4700 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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MP4700
The Future of Analog IC Technology
High-Brightness,
BCM, Low Side Buck White LED Driver
DESCRIPTION
The MP47 00 is a h igh-efficiency step-down
converter designed to drive high-brightness
light emitting diodes.
The MP4700 drives an external MOSFET i n
boundary conduction mode, which features no
reverse recovery loss in the freewheeling diod e
and soft tu rn-on with zero-current and valley
voltage for the power MOSFET th at improves
efficiency and minimizes the inductor value an d
size. The boundary co nduction co ntrol mode
regulates t he LED c urrent by sensing th e
MOSFET p eak current through an external
resistor. I ts low 300 mV feedback voltage
reduces power loss and improves efficiency.
The MP470 0 implement s PWM di mming to the
LED current.
Protection features include output short
protection, under-voltage lockout f or the IC
input voltage and bus input voltage, a limited
maximum switching frequency, and thermal
shut down.
FEATURES
8V-to-18V Input Voltage
Constant-Current LED Driver
Power MOSFET Zero-Current Turn-On
No Freewheeling Diode Reverse Recovery
Issues
High Efficiency and Reliability in Boundary
Conduction Mode
Low 1mA Operation Current
PWM Dimming Control
Hiccup Short Circuit Protection
UVLO for Bus Input Voltage
Input UVLO, Thermal Shutdown
Maximum Frequency Limited to 160kHz
Available in SOIC8 Package
APPLICATIONS
LED Backlighting for TV and Monitor
DC/DC or AC/DC LED Driver applications
General Illumination
Industrial Lighting
Automotive/ Decorative LED Lighting
All MPS parts are lead-free and adhere to the RoHS directive. 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
MP4700 Rev. 1.0
10/29/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
1
http://www.Datasheet4U.com
1 page  
MP4700 – HIGH-BRIGHTNESS BCM, LOW SIDE BUCK WLED DRIVE WLED DRIVER
TYPICAL CHARACTERISTICS
PWM Pull Up Current vs.
Temperature
12.000
CS Pin Current vs.
Temperature
VCS=0.3V
0.000
Input Bus Voltage
UVLO Threshold vs.
Temperature
1.300
11.000
10.000
9.000
-0.100
-0.200
-0.300
-0.400
1.250
1.200
1.150
8.000
-50 -30 -10 10 30 50 70 90 110 130
-0.500
-50 -30 -10 10 30 50 70 90 110 130
1.100
-50 -30 -10 10 30 50 70 90 110 130
Input Bus Voltage
UVLO Hysteresis vs.
Temperature
0.110
0.100
0.090
0.080
0.070
0.060
0.050
-50 -30 -10 10 30 50 70 90 110 130
VCC UVLO vs.
Temperature
7.450
7.400
7.350
7.300
7.250
7.200
-50 -30 -10 10 30 50 70 90110130
VCC Voltage vs.
Temperature
8.550VIN=10V
8.500
8.450
8.400
8.350
8.300
8.250
8.200
8.150
8.100
-50 -30 -10 10 30 50 70 90110130
PWM Input High Threshold
vs. Temperature
1.500
1.450
1.400
1.350
1.300
1.250
1.200
-50 -30 -10 10 30 50 70 90110130
PWM Low High Threshold
vs. Temperature
CS Reference Volatage vs.
Temperature
0.800
303.500
0.780
303.000
302.500
0.760
302.000
301.500
0.740
301.000
300.500
0.720
300.000
299.500
0.700
299.000
-50 -30 -10 10 30 50 70 90110130
-50 -30 -10 10 30 50 70 90110130
MP4700 Rev. 1.0
10/29/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
5
5 Page 
MP4700 – HIGH-BRIGHTNESS BCM, LOW SIDE BUCK WLED DRIVE WLED DRIVER
Hiccup Output-Short Protection
If the entire LED string is shorted, V OUT is zero.
Due to the minimal on time limit, t he inducto r
current will be out of regulation. T he MP4700
can detect t his failure and shut do wn for about
2.8ms, and then re-tries the operation. This
hiccup protection can eliminate thermal issues
due to a short-circuit current, and a lso maintain
normal operation if t he protection is mis-
triggered.
Input-Bus-Voltage Under-Voltage Lockout
(UVLO) Protection
The MP4700 implements UVLO protection for
the input bu s voltage. T he INUV pin senses the
input bus voltage throug h a voltage divider. The
IC is locked out until th e input bus voltage rises
so that th e INUV voltage pin excee ds its UVLO
threshold. T his UVLO f unction prot ects against
a low input bus voltage. For best results, set th e
input bus voltage UVLO point over 1.1 times the
output LED voltage.
Set the input bus UVLO as follows:
RINUV _ H
RIVNUV _ L
VBus _UVLO
INUV _ th
1
Where V INUV_th=1.2V is t he INUV pin threshold
voltage.
VCC Under-Voltage Lockout (UVLO)
Protection
Under-voltage lockout ( UVLO) protects the chip
from operating at an in sufficient supply voltage.
The UVLO rising thre shold is about 7.4V while
its falling threshold is a consistent 6.4V.
Thermal Shutdown Protection
An accurat e temperature protection prevents
the chip fr om operating at exceedingly hig h
temperatures. When the silicon die t emperature
exceeds its upper threshold, it shut s down the
whole chip. When the te mperature drops below
its lower threshold, the chip is enabled again.
MP4700 Rev. 1.0
10/29/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet MP4700.PDF ] | |
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