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PDF MP4652 Data sheet ( Hoja de datos )
| Número de pieza | MP4652 | |
| Descripción | HIGH PERFORMANCE OFF-LINE TV LED DRIVER | |
| Fabricantes | MPS | |
| Logotipo |  |
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MP4652
The Future of Analog IC Technology
DESCRIPTION
The MP465 2 is a h igh-performance, off-line
LED d river designed to power LEDs f or h igh-
power isolat ed applications, su ch as LCD TV
backlighting. It is availa ble in a 16 -pin SOIC
package.
The MP 4652 can op erate at a fixed operating
frequency or a variab le f requency co ntrolled
externally. It outputs two 180-degree phase-
shifted driver signals for various ext ernal power
stages, like LLC, half bridge and flyback. Its
enhanced 9V gate driver can sufficiently drive
the external MOSFETs and dire ctly drives the
external gate drive transformer.
The MP4652 implemen ts fast and continuous
PWM dimming for LE Ds. It outp uts a drive r
signal to directly dim the LED current through a
dimming MOSFET an d achieves fast PWM
dimming. It provides continuous gate driver
signals to t he power stage to the whole PWM
dimming cycle that eliminates the audible noise:
the MP4652 can achieve 1000:1 PWM dimming
ratio without any audible noise issue. The PWM
dimming is controlled by either a DC input
voltage or a direct PW M signal. T he DC input
PWM dimmi ng frequency can be synchronized
by an external signal.
The b uilt-in f ault man agement features inclu de
open LED pr otection, shor t LED pro tection,
protection a gainst shorts along any po int o f the
LED str ing to gr ound, an d ove r temp erature
protection. The protection interface is flexible and
is easy to use. At fault protection, system can be
set up with auto-recovery or latch up.
HIGH PERFORMANCE
OFF-LINE TV LED DRIVER
FEATURES
• LLC, Half Bridge or Flyback Controller
• Fast and Continuous PWM Dimming with
Audible Noise Elimination
• 1000:1 PWM Dimming Ratio
• Input Voltage Range from 9V to 30V
• 9V Enhanced Gate Driver
• Fixed or Externally Programmable
Operating Frequency
• DC or PWM Input Dimming Control
• DC Input PWM Dimming Frequency
Synchronization
• Smart Fault Protection Interface
• Open and Short LED String Protection
• Protection Against Shorts Along the LED
String to Ground
• Built-In Fault Management
• System Auto Recovery or Latch Up at Fault
Protection
• Available in SOIC 16 Package
• Pin-to-Pin with MP4651
APPLICATIONS
• Flat-Panel Video Displays
• Street Lighting
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.
The MP4652 is covered by US Patents 6,683,422, 6,316,881, and
6,114,814. Other Patents Pending.
MP4652 Rev.1.01
9/23/2011
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  
MP4652—HIGH PERFORMANCE OFF-LINE TV LED DRIVER
ELECTRICAL CHARACTERISTICS (continued)
VIN = 12V, TA = 25°C, unless otherwise noted.
Parameter Sy
mbol Condition
Fault Timer (FT)
Threshold V
Source Current
Comp
Clamp Voltage
Reference Current
Pull Down Current At Fault
Condition
th(FT)
ISOURCE(FT)
VCOMP
ICOMP+
ICOMP-FAULT
FB = 0V
Fault Mode is triggered
Burst Frequency Synchronization (SYNC)
High Logic Level
VSYNC-H
Low Logic Level
VSYNC-L
Pulse Width
tsync
Synchronizing Frequency
fSYNC
DC input PWM dimming,
Compared to the
frequency fBFS set by
BFS pin R and C
Fault Detection Threshold (SSD, FB)
SSD Threshold
SSD Detection Delay Time
FB Threshold
FB Detection Delay Time
VSSD
TD_SSD
VFB
TD_FB
VCC
Voltage V
Current I
VCC No
VCC
load
Min Typ
2.2 2.4
8
0.60
20
30
1.4
6
110% 120%
2.22 2.36
7
1.1 1.2
7
8.7 9.7
20
Max Units
2.6 V
µA
V
µA
µA
V
0.7 V
20 µs
fBFS
2.55 V
µs
1.3 V
µs
10.5
V
mA
MP4652 Rev.1.01
9/23/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
5
5 Page 
MP4652—HIGH PERFORMANCE OFF-LINE TV LED DRIVER
APPLICATION INFORMATION
Pin 1 (OVP):
This pin is used for over-voltage
protection.
When the output volta ge to th is pin exceed s
2.38V for 7 μs, the Fau lt Mode is t riggered. Fo r
applications involving multiple LED strings, apply
the maximum output voltage of the LED strings to
this pin.
Pin 3 (SSD):
This short string detection pin is used for
protection a gainst shorts along any point of th e
LED string t o ground. T he SSD pin monitors th e
secondary side current. When the voltage on this
pin falls below 2.36V f or 7 μs, the IC treats t he
condition as a short and triggers the Fault Mode.
Pin 4 (FB):
This pin is used for LE D current re gulation. Th e
voltage on this pin is r egulated by an external
circuit with a 0.6V average value. Use a samp le-
hold circu it to sense th e LED current when the
PWM goes high, and hold the value when th e
PWM goes low.
The FB pin also functions as
short string
protection. When the voltage on FB excee ds
1.2V for 7μs, the IC triggers the Fault Mode.
For frequency-controlle d applicat ion like an LL C
power stage, the LED current is regulated with an
external-frequency control loop. Connect FB to
ground and set the IC to operate at the maxi mum
duty cycle.
Pin 5 (COMP):
This pin is use d for compensation purp oses. F or
PWM-controlled ap plications, such a s h alf-bridge
and f lyback pow er st ages, con nect a n X 7R
ceramic capacitor with a va lue between 47nF and
470nF from COMP to GND. The value of this
capacitor d etermines t he stability of the LED
current regulation.
For frequency-controlled applicat ions like t he
LLC power stage, conn ect a 1nF capacitor to the
COMP pin.
Pin 6 (FT):
Connect a capacitor from this pin to GND to set
the fault timer. This sets the system recovery
time after detecting a fault condition.
TFT
=
2.38V ×CFT
8μA
A 10nF cap acitor on F T sets the delay time to
around 3ms
If the circu it requires a latch-up for Fault Mode,
connect this pin to a 200kΩ resistor.
Pin 8 (FSET):
This pin is used to set the operating frequency.
The source current thr ough this p in determines
the operating frequency.
For fixed-operating–fre quency PWM-controlled
applications—like ha lf-bridge and flyback power
stages—connect a resistor from this pin to GND
to set the o perating frequency (f o). The value for
this resistor RFSET is calculated by
RFSET
= 1.25×109
fo
For an ope rating frequ ency of 50kHz, R FSET =
25kΩ.
For frequency-controlle d applicatio ns like LL C,
connect the control volt age to FSET pin throug h
a resistor, as shown in Figure 3. This contr ol
voltage programs the so urce current through this
pin to control the operating frequency.
ILED
IRef
Vcontrol
MP4652
FSET
Figure 3—FSET Set Up for Frequency
Controlled Application.
MP4652 Rev.1.01
9/23/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet MP4652.PDF ] | |
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