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MPS

MP1048 Datasheet

Full Bridge CCFL Controller


MP1048 Datasheet Preview


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The Future of Analog IC Technology
MP1048
Full Bridge
CCFL Controller
DESCRIPTION
The MP1048 is a fixed operating frequency
inverter controller that controls four external
N-Channel power MOSFETs in a full-bridge
configuration. The inverter is designed to power
up to 6 cold cathode fluorescent lamps (CCFLs)
to backlight liquid crystal displays. Its full-bridge
architecture converts unregulated DC input
voltages to the nearly pure sine waves required
to ignite and operate CCFLs.
For reliable lamp ignition, the operating
frequency is set by an external resistor and
during startup is temporarily swept toward the
unloaded resonant frequency of the tank. Burst
mode or analog mode dimming are controlled
with an external analog signal. Built-in fault
management features include an open lamp
regulator, a transformer secondary peak current
regulator and a dual-mode fault timer. The
secondary over-current timeout can be
shortened with external components. The
MP1048 is available in TSSOP28 and SOIC28
packages.
TYPICAL APPLICATION
FEATURES
Capable of Driving up to 6 Lamps
Controls Four External, Low Cost, N-Channel
MOSFETs
Fixed Operating Frequency
Input Voltage Range of 10V to 22V
Lamp Current and Voltage Regulation
Full-Wave Sense Amp
Analog and Burst Mode Dimming Control
Integrated Burst Mode Oscillator and Modulator
Soft-On and Soft-Off Burst Envelope
Open Lamp Protection
Secondary Over-Current Protection
Dual-Mode Fault Timer
Available in TSSOP28 and SOIC28 Packages
APPLICATIONS
Desktop LCD Flat Panel Displays
Monitors
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
The MP1048 is covered by US Patents 6,683,422, 6,316,881, and 6,114,814.
Other Patents Pending.
DBRT
ABRT
EN
1
SI
2
LI
3
LV
4
COMP
5
AG
6
FT
7
LCS
8
LCC
9
BRC
10
BRS
11
DBRT
12
ABRT
13
EN
14
NC
PGL
LGL
VCCL
OUTL
UGL
BTL
PRL
PGR
LGR
VCCR
OUTR
UGR
BTR
PRR
28
27
26
25
24
23
22
21
20
19
18
17
16
15
GND
VPS
MP1048 Rev. 0.9
9/24/2007
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
1
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PACKAGE REFERENCE
TOP VIEW
SI 1
LI 2
LV 3
COMP 4
AG 5
FT 6
LCS 7
LCC 8
BRC 9
BRS 10
DBRT 11
ABRT 12
EN 13
N/C 14
28 PGL
27 LGL
26 VCCL
25 OUTL
24 UGL
23 BTL
22 PRL
21 PGR
20 LGR
19 VCCR
18 OUTR
17 UGR
16 BTR
15 PRR
Part Number* Package
Temperature
MP1048EM
TSSOP28 –20°C to +85°C
MP1048EY
SOIC28
–20°C to +85°C
*
For
For
Tape & Reel, add suffix –Z (eg. MP1048EM–Z)
RoHS Compliant Packaging, add suffix –LF
(eg. MP1048EM–LF–Z)
MP1048 – FULL BRIDGE CCFL CONTROLLER
ABSOLUTE MAXIMUM RATINGS (1)
Input Voltage VPRR, VPRL ............................... 24V
Logic Inputs ................................ –0.3V to +6.5V
Inputs SI, LI, LV ................................ –5V to +5V
Junction Temperature...............................150°C
Power Dissipation...................................... 0.6W
Junction Temperature...............................150°C
Lead Temperature (Solder) ......................260°C
Operating Frequency............................. 150KHz
Storage Temperature ..............–55°C to +150°C
Recommended Operating Conditions (2)
Input Voltage VPRR, VPRL .................... 10V to 22V
Analog Brightness Voltage VABRT....... 0V to 1.2V
Digital Brightness Voltage VDBRT........ 0V to 1.2V
Enable Voltage VEN............................ 0V to 5.0V
Operating Frequency............. 20KHz to 100KHz
Operating Frequency (Typical) ................ 60KHz
Operating Temperature .............–20°C to +85°C
Thermal Resistance (3) θJA θJC
TSSOP28 ............................... 82 ...... 20... °C/W
SOIC28................................... 60 ...... 30... °C/W
Notes:
1) The device is not guaranteed to function outside of its
operating conditions.
2) Exceeding these ratings may damage the device.
3) Measured on approximately 1” square of 1 oz copper.
ELECTRICAL CHARACTERISTICS
VPRR = VPRL = 17.5V, VBRC = VLCC = GND, TA = +25°C, unless otherwise noted.
Parameter
Symbol Condition
Min Typ
Output
Gate Pull-Down
Gate Pull-Up
Damper On Resistance
EN
Threshold
Hysteresis
Sync Timing
DBRT Logic Input Threshold
DBRT Logic Input Hysteresis
Burst Rate Generator
Source Current
Lower Threshold
Upper Threshold
RGD
RGU
RON
VTH
VTH_HYS
VTH
VTH_HYS
VBRS = VCC
VBRS = VCC
ISRC(BRS)
VV(BRS)
VP(BRS)
VBRS = 2V
2.0
20
1.2
1.2
0.3
1.8 2.0
0.2
125 150
2.2 2.35
3.2 3.4
Max Units
k
2.0 V
V
2.3 V
V
175 µA
2.5 V
3.6 V
MP1048 Rev. 0.9
9/24/2007
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
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MP1048 – FULL BRIDGE CCFL CONTROLLER
ELECTRICAL CHARACTERISTICS (continued)
VPRR = VPRL = 17.5V, VBRC = VLCC = GND, TA = +25°C, unless otherwise noted.
Parameter
Symbol Condition
Min Typ
Supply Current
Supply Current (Enabled)
Supply Current (Disabled)
Operating Frequency
Accuracy of f0
Frequency Set Voltage
Lamp Current Feedback
Magnitude
Accuracy
Input Resistance
Open Lamp Voltage Feedback
Threshold (Peak)
Secondary Peak Current
Threshold
IPR
IPR
f0 R3 = 100k
VLCS
|VLI|
VLI
RLI
VTH(LV)
VABRT > 1.2V
VABRT = 0V
VLI < 0V
VTH(SI)
2.2
3
45 49
3
1.13 1.18
1.134
0.35
1.15
1.15
1.20
0.40
3
60
1.20
1.20
Fault Timer
Threshold
Sink Current
Open Lamp Source Current
Secondary Over-Current Source
Current
Vt(FT)
ISINK(FT)
ISO(FT)+
ISP(FT)+
1.15 1.20
1
1
65
Comp
Clamp Voltage
Reference Current
Decay Current
Output (VCCR and VCCL)
Voltage
Current
VCOMP
ICOMP+
ICOMP-
End of Burst
VCC
ICC
0.62
20
20
5.7 6.0
5
Max Units
3 mA
25 µA
53 KHz
8%
1.23 V
1.266
0.45
1.25
1.25
V
%
k
V
V
1.25
V
µA
µA
µA
V
µA
µA
6.3 V
mA
MP1048 Rev. 0.9
9/24/2007
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
3
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Page 3
Part Number MP1048
Manufactur MPS
Description Full Bridge CCFL Controller
Total Page 12 Pages
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