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PDF MP4603 Data sheet ( Hoja de datos )
| Número de pieza | MP4603 | |
| Descripción | White LED Driver | |
| Fabricantes | MPS | |
| Logotipo |  |
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MP4603
The Future of Analog IC Technology
DESCRIPTION
The MP4603 is an inte grated white LED driver.
It uses MPS’s patent- pending technology to
drive the backlights for LCD TVs measuring 60 -
inches or la rger, for LE D string volt ages up to
350V. This novel techn ology can leverage the
LED drive power by regulating o nly a small
portion of the LED dri ve voltage—together with
a fixed high -voltage source, a low-voltage LED
driver can drive high voltage LED strings. This
method allo ws for a super-high po wer density,
higher efficiency and lo wer cost du e to the low
voltage stre ss, hig her switching fr equencies,
and smaller passive components.
The MP46 03 is a current-mode–controlled
buck-boost regulator. With a 12V input V INL and
a high voltage source V INH, it can deliver a
regulated voltage (V INH to V INH+68V) to drive a
LED string with up to 100 LEDs. I t c an drive an
external switch in serie s with the LED string to
achieve over 1:1000 dimming ra tio. Analog
dimming ca n be applie d at the same time to
further improve the
dimming ratio. Fault
protections include LED open-string protection,
output short-circuit pro tection, cycle-by-cycle
peak current limiting, and thermal shutdown.
The MP4603 is availab le in TSSOP16-EP and
SOIC16 packages.
White LED Driver for
Large LCD TV Backlights
FEATURES
Novel Power-Leverage-Control Technology
Unique Step-Up/Down Operation
Up to 99.5% Efficiency
0.5 Ω Internal Power MOSFET
Switching Frequency Synchronization
Over 1:1000 Dimming Ratio
Separate Analog and PWM Dimming
±5% 200mV Reference Voltage
10 μA Shutdown Mode
Cycle-by-Cycle Over-Current Protection
Thermal Shutdown Protection
LED String Open and Short Protection
FAULT Output at LED Protection
Output Short-Circuit Protection
Available in TSSOP16-EP and SOIC16
Packages
APPLICATIONS
Large LCD Panels Backlighting
High Power Street LED Lighting
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.
MP4603 Rev. 1.0
4/27/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.MP4603
1
http://www.Datasheet4U.com
1 page  
MP4603 – WHITE LED DRIVER FOR LARGE LCD TV BACKLIGHTS
ELECTRICAL CHARACTERISTICS (continued)
VVIN = 12V, PWM and AD Pins floating, RFST=51kΩ, TA = +25°C, VVSS=VINGND=0V, unless otherwise
noted.
Parameters Sy
Dim Gate Driver Sourcing Current
Dim Gate Driver Sinking Current
LED Open OV Threshold
LED Short T hreshold for Immediate
Latch-Off
LED Short Delay for Latch-Off
Thermal Shutdown (5)
Thermal Shutdown Hysteresis (5)
mbol
IDGD+
I
DGD-
V
OVPTH
VFBS
τDF BS
Condition
VDGD–VSS= 0V,
VPWM=3V
VDGD–VSS=10V,
VPWM=1.5V
300mV < VFBS < 600mV
Min Typ
-25
Max
Units
mA
45
1.2
600
450
150
20
mA
V
mV
μs
°C
°C
Note:
5) Guaranteed by design.
MP4603 Rev. 1.0
4/27/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.MP4603
5
5 Page 
MP4603 – WHITE LED DRIVER FOR LARGE SIZE TV BACKLIGHTING
APPLICATION INFORMATION
The MP460 3 is a buck-boost LE D driver. It s
novel power leverage control technolo
gy
provides a highly efficient, low-cost solution for
LCD TV L ED drivers. It has a high bus voltage
and a low supply voltage (typically 12V or 24V,
up to 60V) to drive
LED bac klight strin gs
of >350V f or LCD T Vs measuring 60-inch or
more.
Setting the LED Current
An external resistor (RFB) sets the maximum LED
current as per:
RFB
0.200V
ILED
Setting the Switching Frequency
An external resistor R FST can set t he switchin g
frequency (fS) as per:
fS
0.95MHz
60k
RFST
This equat ion applies to a programmable
frequency range between 200kHz and 2MHz.
If FST pin is floating or RFST exceeds 400k , the
switching fr equency is set to default value of
0.9MHz.
Setting the Slope Compensation
The MP4 603 empl oys peak-current–mode
control, which needs slope compensation t o
avoid sub-harmonic oscillat ion when the dut y
cycle exceeds 50%.
The current loop has e ffective sen se resistan ce
of 0.4 Ω. Given a desired input/o utput voltage
relationship, estimate t he sense current ramp-
down slope as:
SD0OWN
VL
L
.4V/s
Where V L is the voltag e across th e inductor in
volt; and L is the inductor value in μH.
Ensuring current loop stability requires a
compensation slope of at least half of the ramp-
down slope:
SSSC
1
2
DOWN
An external resistor (R SLOPE) can set the slop e
compensation for the current loop as per:
S=SC
0.6
V
s
*
60k
RSLOPE
The equation is effective only for a resistor range
from 20kΩ to 400kΩ for RSLOPE.
If SLOPE pin is float ing or R SLOPE exceeds
400k, the slope compensation is set to defau lt
value of 0.5V/μs.
Selecting the Inductor
The input voltage, output voltage, and LED
current fact or into indu ctor sele ction. In additio n,
select the inductor so that th e circuit always
operates in continuous current mode (CCM).
Estimate the inductor value using the following
equation:
L
fS
VIN VOUT
(VIN VOUT ) IL
Where IL is the indu ctor peak-to- peak curren t
ripple. Design IL somewhere aro und 40% to
60% of the inductor average current, which is:
IL _ AVG
ILED
(1
VOUT
VIN
).
Select an inductor that does not sa turate at th e
maximum peak current, which is:
ILI_ PK L _ AVG 0.5 IL .
Selecting the Input Capacitor
The input capacitor red uces the surge current
drawn from the input supply and the switching
noise from the device. Use ceramic capacitors
with X5R or X7R dielectrics because they have
low ESR values and small temperature
coefficients. Select a sufficiently-large
capacitance to limit the input voltage ripple
(VIN), which is normally less than 5%-10% of the
DC value.
CIN
IL _ AVG VOUT
fsV IN (VIN VOUT )
MP4603 Rev. 1.0
4/27/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.MP4603
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet MP4603.PDF ] | |
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