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PDF MP4601 Data sheet ( Hoja de datos )
| Número de pieza | MP4601 | |
| Descripción | White LED Driver | |
| Fabricantes | MPS | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MP4601 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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The Future of Analog IC Technology
DESCRIPTION
The MP4601 is an inte grated white LED driver.
It can be applied with MPS pat ent pending
technology to drive up t o 60 in ch or larger size
LCD TV ba cklighting, in which the LED string
voltage can be up to 350V. The novel
technology can leverage the LED drive power
by regulating only small portion of the LED drive
voltage. As a resu lt, working tog ether with a
fixed high voltage sour ce, a low v oltage LED
driver can be used to drive the high voltage
LED strings with super high power d ensity, high
efficiency a nd low cost due to the low voltage
stress, high switching frequency, and smaller
size of passive components.
MP4601 is a current mode con trolled buck-
boost regulator. With a 12V input V INL and a
high voltage source VINH, it can deliver a
regulated voltage (V INH to V INH+63V) to drive a
LED string with up to 100 LEDs. I t c an drive an
external switch, which is in series with the LE D
string, to achieve over 1:1000 dimming ratio.
Analog dimming can be applied in the same
time to further improve t he dimming ratio. Fault
protection includes LED open strings protection,
output short circuit pr otection, cycle-by-cycle
peak current limiting, and thermal shutdown.
MP4601 is available in TSSOP16-EP an
SOIC16 packages.
d
MP4601
White LED Driver For
Large Size TV Backlighting
FEATURES
• Novel Power Leverage Control Technology
• Unique Step-up/down Operation
• Up to 99.5% Efficiency
• 0.5 Ω Internal Power MOSFET Switch
• Switching Frequency Synchronization
• Over 1:1000 Dimming Ratio
• Analog and PWM Dimming
• ±5% 200mV Reference Voltage
• 850µA Quiescent Current
• 10µA Shutdown Mode
• Programmable Cycle-by-Cycle Over Current
Protection
• Thermal Shutdown Protection
• LED String Open and Short Protection
• FAULT Output for Short LED Protection
• Output Short Circuit Protection
• Available in TSSOP1 6-EP and SOIC16
Packages
APPLICATIONS
• TV Backlighting
• Large LCD Panels Backlighting
For MPS green status, please vis it MP S we bsite un der Quality Assurance.
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
MP4601 Rev. 1.0
1/28/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
1
http://www.Datasheet4U.com
1 page  
MP4601 – WHITE LED DRIVER FOR LARGE SIZE TV BACKLIGHTING
ELECTRICAL CHARACTERISTICS (continued)
VVIN = 12V, PWM and AD Pins floating, RFST=51kΩ, TA = +25°C, VVSS=VINGND=0V, unless otherwise
noted.
Parameters Sy
LED Open OV Threshold
LED Open OV Hysteresis
LED Short Threshold for Immediate Latch-off
LED Short Delay for Latch-off
Thermal Shutdown
Thermal Shutdown Hysteresis
mbol
VOVPTH
VOVPHYS
VFBS
TD_FBS
Condition
300mV < VFBS <
600mV
Min Typ
1.2
0.1
600
480
150
20
Max
Units
V
V
mV
µs
°C
°C
Note:
5) Guaranteed by design.
MP4601 Rev. 1.0
1/28/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
5
5 Page 
MP4601 – WHITE LED DRIVER FOR LARGE SIZE TV BACKLIGHTING
OPERATION
The MP460 1 is a current mode re gulator. The
sensing re sistor sen ses the LED current and
feeds it b ack to an error amplifier, which
regulates it to 200 mV with an in side
compensation network. The COMP pin is the
output of th e error amplifier. The inductor peak
current is proportional to the COMP pin voltage.
An increase of the COMP voltage in creases the
current delivered to the output.
LED Open Protection
If the LED is open, there is no voltage on the
FB pin. The duty cycle will increase until V OVP-
VVSS reaches the shutdown threshold. The top
switch will t urn off until the voltag e V OVP-VVSS
decreases sufficiently. System e njoys auto-
recovery for the LED open protection.
LED Short Protection
If the FB voltage is higher than 600mV,
immediately IC is latch ed off and DGD is pulled
low. If FB voltage is higher than 300mV for
480µs, IC is also latched off and D GD is pulled
low. The EN needs re set to restar t the IC. Th e
Fault pin is pulled low when IC is latched off.
Dimming Control
The MP460 1 allows both Analog and PW M
dimming. For analog dimming, when the
voltage on DIM is from 0.7V to1.5 V, the LED
current will change fro m 0% to 1 00% of the
maximum L ED current. If the volta ge on DI M
pin is highe r than 1.5V or DIM pin is floated,
maximum LED current will be generated.
For PWM d imming, a PWM signal with 100Hz
to 50kHz frequency, amplitude over 1.5V
should be applied to DIM pin.
For combined PWM and analog dimming to get
a further high dimming ratio, apply a 100Hz to
50kHz PWM signal with its amplitu de from 0.7V
to 1.5V to DIM pin.
DIM pin floated will del iver the maximum LED
current.
At PWM di mming off interval, an int ernal switch
disconnects the COMP pin capacit or from the
output of the error amplifier. Therefore, the
COMP voltage is hold at PWM off interval. This
feature improves the r esponse speed of the
LED current and helps t o achieve high dimming
ratio.
Digital dim ming can achieve over 1:1000
dimming ratio with DIM frequency less than
200Hz.
MP4601 Rev. 1.0
1/28/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
11
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| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MP4601.PDF ] | |
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