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PDF MP3378 Data sheet ( Hoja de datos )
| Número de pieza | MP3378 | |
| Descripción | 4-Channel WLED Controller Plus High-Efficiency Buck Converter | |
| Fabricantes | MPS | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MP3378 (archivo pdf) en la parte inferior de esta página. Total 25 Páginas | ||
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The Future of Analog IC Technology
MP3378
24 V, 4-Channel WLED Controller
Plus High-Efficiency Buck Converter
DESCRIPTION
The MP3378 is a one-chip solution designed for
monitor applications. It includes a step-up
controller with 4 current channels for
backlighting and a high-efficiency buck
converter for internal bus voltage or standby
power.
The 4-string WLED controller drives an external
MOSFET to boost up the output voltage from
the input supply. It regulates the current in each
LED string to the programmed value set by an
external current-setting resistor. It supports both
analog and PWM dimming independently to
meet the special dimming mode request. In
addition, rich protection modes are integrated
including OCP, OTP, UVP, OVP, LED
short/open protection, and inductor/diode short
protection.
The high-efficiency buck converter operates in
current mode with a built in MOSFET and
synchronous rectifier. It offers a very compact
solution to achieve excellent load and line
regulation. Full protection features include OCP
and thermal shutdown.
The MP3378 is available in SOIC28 and
TSSOP28EP package.
FEATURES
WLED Controller:
• 4-String, Max 350 mA/String WLED
Controller
• Up to 24 V Input Voltage Range
• 2.5% Current Matching Accuracy
• Programmable Switching Frequency
• PWM and Analog Dimming Mode
• Open and Short LED Protection
• Programmable Over-Voltage Protection
• Recoverable Thermal Shutdown Protection
• Over-Current Protection
• Over-Temperature Protection
• Inductor/Diode Short Protection
Buck Converter:
• 144 mΩ/58 mΩ Low Rds(on) Internal Power
MOSFETs
• Low Quiescent Current
• Fixed 235 kHz Switching Frequency
• Frequency Sync from 250 kHz to 2 MHz
External Clock
• AAM Power-Save Mode
• Internal Soft Start
• OCP and Hiccup
• Over-Temperature Protection
• Output Adjustable from 0.8 V
APPLICATIONS
• Desktop LCD Flat Panel Displays
• Flat Panel Video Displays
• 2D/3D LCD TVs and Monitors
All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For
MPS green status, please visit the MPS website under Quality Assurance.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
MP3378 Rev. 1.0
8/25/2015
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 MPS. All Rights Reserved.
1
1 page  
MP3378 – 4-CHANNEL WLED CONTROLLER PLUS BUCK CONVERTER
ELECTRICAL CHARACTERISTICS (5)
VIN1 = VIN2 = 12 V, VEN = 5 V, TA = 25°C, unless otherwise noted.
Parameters
Symbol Condition
WLED controller section
Supply current (quiescent)
IQ1
Supply current (shutdown)
IST
LDO output voltage
VCC1
VCC1 UVLO threshold
VCC1 UVLO hysteresis
EN high voltage
EN low voltage
STEP-UP CONVERTER
Gate driver
(sourcing)
Gate driver
(sinking)
impedance
impedance
VCC1_UVLO
VEN_HIGH
VEN_LOW
Switching frequency
fSW1
OSC voltage
Maximum duty cycle
Cycle-by-cycle
current limit
ISENSE
COMP source current limit
COMP sink current limit
COMP transconductance
CURRENT DIMMING
PWM input low threshold
PWM input high threshold
Analog dimming input low
threshold
Analog dimming input high
threshold
LED CURRENT
REGULATION
ISET voltage
LEDX average current
Current matching (5)
VCC max current limit
LED FET resistance
VOSC
DMAX1
ICOMP SOLI
ICOMP SILI
GCOMP
VPWM_LO
VPWM_HI
VISET
ILED
ICC1_Limit
R_LED
VIN1 = 12 V, VEN = 5 V, no
load without switching,
buck disabled
VEN = 0 V, VIN = 12 V, buck
disabled
VEN = 5 V,
7 V < VIN1 < 28 V,
0 < IVCC1 < 10 mA
Rising edge
VEN rising
VEN falling
VCC1 = 6 V, VGATE = 6 V
VCC1 = 6 V, IGATE = 10 mA
ROSC = 115 kΩ
ROSC = 374 kΩ
Max duty cycle
1 V < COMP < 1.9 V
1 V < COMP < 1.9 V
ΔICOMP = ±10 μA
VPWM falling
VPWM rising
RISET = 30.5 kΩ
ILED = 32 mA
ILED = 10 mA
Min
1.2
5.4
3.6
1.8
470
150
1.20
145
1.25
0.38
1.44
1.20
31.4
50
Typ
1.35
6
4
200
4.1
3
530
180
1.23
93
180
70
17
440
0.41
1.49
1.225
32
75
1.7
Max
1.5
1
6.6
4.4
0.6
7
5
590
210
1.26
215
0.75
0.44
1.54
1.25
34.2
2.5
100
Units
mA
μA
V
V
mV
V
V
Ω
Ω
kHz
kHz
V
%
mV
μA
μA
μA/V
V
V
V
V
V
mA
%
mA
Ω
MP3378 Rev. 1.0
8/25/2015
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 MPS. All Rights Reserved.
5
5 Page 
MP3378 – 4-CHANNEL WLED CONTROLLER PLUS BUCK CONVERTER
PIN FUNCTIONS (continued)
Pin #
14
15
16
17,18
19
20
21
22
23
24
25
26
27
28
Name
VCC2
VIN2
SW
GND2
AGND
BST
SYNC
ISENSE
GATE
VIN1
VCC1
COMP
EN
PWM
Description
Bias supply for buck converter. Decouple with a 0.1 μF-0.22 μF capacitor. The
capacitance should be no more than 0.22 μF.
Supply voltage input for buck converter. A ceramic capacitor is needed to decouple
the input rail. Use a wide PCB trace to make the connection.
Switch output for buck converter. Use a wide PCB trace to make the connection.
Ground for buck converter.
Analog ground for buck converter.
Bootstrap for buck converter. A capacitor and a 47 Ω resistor connected between SW
and BST are required to form a floating supply across the high-side switch driver.
Synchronization for buck converter. Apply a clock signal with a frequency higher than
250 KHz; the frequency of the buck converter can be synchronized by the external
clock. The internal clock’s rising edge is synchronized to the external clock’s falling
edge.
Current sense input for WLED controller. During normal operation, ISENSE senses
the voltage across the external inductor current-sensing resistor (RSENSE) for peak-
current–mode control. Also, it limits the inductor current during every switching cycle.
Power switch gate output for WLED controller. GATE drives the external power
N-channel MOSFET.
Supply input for WLED controller.
The internal 6 V linear regulator output for WLED controller. VCC1 provides a
power supply for the external MOSFET switch gate driver and the internal control
circuitry. Bypass VCC1 to GND with a ceramic capacitor.
Error amplifier output of WLED controller. Connect a capacitor and resistor in series
to stabilize the boost converter loop.
Enable input for WLED controller.
Input signal for PWM brightness control. If PWM is floated, pull internally to GND.
MP3378 Rev. 1.0
8/25/2015
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet MP3378.PDF ] | |
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