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PDF MP3391EF Data sheet ( Hoja de datos )
| Número de pieza | MP3391EF | |
| Descripción | 120mA/ch Step-Up WLED Driver Controller | |
| Fabricantes | MPS | |
| Logotipo |  |
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The Future of Analog IC Technology
DESCRIPTION
The MP3391 is a step-up controller with 8-
channel current sources designed for driving
the WLED arrays for large size LCD panel
backlighting applications.
The MP3391 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 9V to 35V
input supply. The MP3391 regulates the current
in each LED string to the programmed value set
by an external current setting resistor.
The MP3391 applies 8 internal current sources
for current balance. And the current matching
can achieve 2.5% regulation accuracy between
strings. Its low 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.
MP3391
8-Channel, 120mA/ch Step-Up
WLED Driver Controller
FEATURES
• 9V to 35V Input Voltage Range
• 10V MOSFET Gate Driver
• Drive Selectable 8, 6 and 4 Strings of LEDs
• Maximum 120mA for Each String
• 2.5% Current Matching Accuracy Between
Strings
• Programmable Switching Frequency
• PWM or DC Input Burst PWM Dimming
• Open/Short protection and Fault Flag
Output
• Programmable Short Protection Voltage and
Time Threshold
• Programmable Over-voltage Protection
• Flexible Extendable LED Channels
Application
• 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.
MP3391 Rev. 1.12
www.MonolithicPower.com
9/22/2015
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 MPS. All Rights Reserved.
1
1 page  
MP3391—8-CHANNEL, 120mA/CH STEP-UP WLED DRIVER CONTROLLER
ELECTRICAL CHARACTERISTICS (continued)
VIN =18V, VEN = 5V, TA = +25°C, unless otherwise noted.
Parameters
Symbol Condition
Min Typ
LED CURRENT REGULATION
ISET Voltage
LEDX Average Current
Current Matching (5)
LEDX Regulation Voltage
VISET
ILED
VLEDX
RISET=20kΩ
ILED=60.4mA
ILED=60.4mA
1.21 1.23
58.9 60.4
450
PROTECTION
OVP Over Voltage Threshold
OVP UVLO threshold
LEDX UVLO Threshold
SSET Voltage Gain
TSET Source Current
TSET Fault Threshold
VOVP_OV
VOVP_UV
VLEDX_UV
ITSET
Rising Edge
Step-up Converter Fails
Short LED Voltage Threshold
1.20
50
140
4.2
40
1.20
1.24
80
190
4.5
50
1.24
Thermal Shutdown Threshold
FF Pull Down Resistance
VFAULT Pull Down Current
VFAULT Blocking-Off Voltage
(with Respect to VIN)
TST
RFF
IFAULT
VFAULT VIN =18V, VIN-VFAULT
150
100
40 55
6
Notes:
5) Matching is defined as the difference of the maximum to minimum current divided by 2 times average currents.
Max
1.25
61.9
2.5
1.28
110
240
4.8
60
1.28
70
Units
V
mA
%
mV
V
mV
mV
μA
V
℃
Ω
μA
V
MP3391 Rev. 1.12
www.MonolithicPower.com
9/22/2015
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 MPS. All Rights Reserved.
5
5 Page 
MP3391—8-CHANNEL, 120mA/CH STEP-UP WLED DRIVER CONTROLLER
Open String Protection
The open string protection is achieved through
detecting the voltage of OVP and LED1~8 pin. 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 marks off the open
strings whose LEDX pin voltage is less than
190mV. 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 MP3391 always tries to light at least one
string and if all strings in use are open,
theMP3391 shuts down the step-up converter.
The part maintains mark-off information until
resetting it.
Short String Protection
The MP3391 monitors the LEDX pin voltage to
judge if the short string occurs. If one or more
strings are short, the respective LEDX pins
tolerate high voltage stress. If the LEDX pin
voltage is higher than threshold programmed by
SSET pin, the short string condition is detected
on the respective string. When the short string
fault (LEDX over-voltage fault) continues for
greater than protection timer programmed by
TSET capacitor, 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 MP3391 shuts
down the step-up converter.
When the open or short protection is triggered,
the FF pin will be pull to GND. the pull-up resistor
RFF and FF pin achieve the fault flag function to
indicate the system status.
MP3391 Rev. 1.12
www.MonolithicPower.com
9/22/2015
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet MP3391EF.PDF ] | |
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