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PDF MP3399 Data sheet ( Hoja de datos )
| Número de pieza | MP3399 | |
| Descripción | Cascading White LED Driver | |
| Fabricantes | MPS | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MP3399 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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The Future of Analog IC Technology
MP3399
12-String, Cascading White LED Driver
For Extending LED Channels
DESCRIPTION
The MP3399 is a step-up controller with 12-
channel current sources designed for driving
the WLED arrays for large size LCD panel
backlighting applications. The MP3399 is
flexible for extending LED channels with two or
more MP3399s in parallel while operating from
a single Inductor power source.
The MP3399 uses current mode, fixed frequency
architecture. The switching frequency is
programmable by an external frequency setting
resistor. It drives an external MOSFET to boost
up the output voltage from a 5V to 28V input
supply. The MP3399 regulates the current in
each LED string to the programmed value set by
an external current setting resistor.
The MP3399 applies 12 internal current
sources for current balance. And the current
matching can achieve 2.5% regulation accuracy
between strings. Its low 600mV regulation
voltage on LED current sources reduces power
loss and improves efficiency.
PWM dimming is implemented with external
PWM input signal or DC input signal. The
dimming PWM signal can be generated internally,
and the dimming frequency is programmed by
an external setting capacitor.
FEATURES
• 12 String, 60mA/String WLED Driver
• Cascading Capability with a single Power
Source
• 5V to 28V Input Voltage Range
• Maximum 60mA for Each String
• 2.5% Current Matching Accuracy Between
Strings
• Programmable Switching Frequency
• PWM or DC Input Burst PWM Dimming
• Open and Short LED Protection
• Programmable Over-voltage Protection
• Under Voltage Lockout
• Thermal Shutdown
• 28-pin TSSOP and 28-pin SOIC Package
APPLICATIONS
• Desktop LCD Flat Panel Displays
• Flat Panel Video Displays
• LCD TVs and Monitors
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.
MP3399 Rev. 1.0
3/27/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
1
1 page  
MP3399-12-STRING, CASCADING WHITE LED DRIVER WITH STEP-UP CONTROLLER
ELECTRICAL CHARACTERISTICS (continued)
VIN =12V, VEN = 5V, TA = +25°C, unless otherwise noted.
Parameters
Symbol Condition
Min Typ
LEDX Regulation Voltage
VLEDX ILED=30.5mA
600
PROTECTION
OVP Over Voltage Threshold
OVP UVLO threshold
LEDX UVLO Threshold
LEDX Over Voltage Threshold
Thermal Shutdown Threshold
VFAULT Pull Down Current
VFAULT Blocking-Off Voltage
(with Respect to VIN)
VOVP_OV
VOVP_UV
VLEDX_UV
VLEDX_OV
TST
IFAULT
VFAULT
Rising Edge
Step-up Converter Fails
VIN =12V, VIN-VFAULT
1.17
50
156
5.8
40
5.3
1.23
70
196
6.3
150
55
5.8
Notes:
5) Matching is defined as the difference of the maximum to minimum current divided by 2 times average currents.
Max Units
mV
1.3 V
90 mV
236 mV
6.8 V
℃
70 μA
6.3 V
MP3399 Rev. 1.0
3/27/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
5
5 Page 
MP3399-12-STRING, CASCADING WHITE LED DRIVER WITH STEP-UP CONTROLLER
When bias the BOSC pin to a DC level by a
resistor, applying an external PWM signal to the
DBRT pin to achieve the PWM dimming. A DC
analog signal can be directly applied to the DBRT
pin to modulate the LED current. And the DC
signal is then converted to a DPWM dimming
signal at the setting oscillation frequency.
The brightness of the LED array is proportional to
the duty cycle of the DPWM signal. The DPWM
signal frequency is set by the cap at the BOSC
pin.
Open String Protection
The open string protection is achieved through
the over voltage protection. If one or more strings
are open, the respective LEDX pins are pulled to
ground and the IC keeps charging the output
voltage until it reach OVP threshold. Then the
part will mark off the open strings whose LEDX
pin voltage is less than 180mV. Once the mark-
off operation completes, the remaining LED
strings will force the output voltage back into tight
regulation. The string with the highest voltage
drop is the ruling string during output regulation.
The MP3399 always tries to light at least one
string and if all strings in use are open, the
MP3399 shuts down the step-up converter. The
part will maintain mark-off information until the
part shuts down.
Short String Protection
The MP3399 monitors the LEDX pin voltage to
judge if the short string occurs. If one or more
strings are short, the respective LEDX pins will
be pulled up to the boost output and tolerate high
voltage stress. If the LEDX pin voltage is higher
than 6.5V, the short string condition is detected
on the respective string. When the short string
fault (LEDX over-voltage fault) continues for
greater than 2048 switching clocks, the string is
marked off and disabled. Once a string is marked
off, its current regulation is forced to disconnect
from the output voltage loop regulation. The
marked-off LED strings will be shut off totally until
the part restarts. If all strings in use are short, the
MP3399 will shut down the step-up converter.
MP3399 Rev. 1.0
3/27/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet MP3399.PDF ] | |
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