Sharp LC-32LE511E (serv.man2) Service Manual ▷ View online
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MP1583 (U38)
DESCRIPTION
The MP1583 is a step-down regulator with abuilt-in internal Power MOSFET. It achieves 3A
of continuous output current over a wide input supply range with excellent load and line
regulation.
Current mode operation provides fast transient response and eases loop stabilization.
.
.
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device
reliability. The absolute maximum ratings are stress ratings only.
Parameter
Conditions
Min. Max. Unit
VIN to PGND
28
V
VCC to AGND
AGND = PGND
6
V
BOOT to PGND
35
V
BOOT to SW
-0.3
6.0
V
Continuous
-0.5 24.0
SW to PGND
Transient (t < 20ns, f < 600KHz)
-5.0
30.0
V
All other pins
-0.3
V
CC
+0.3 V
Human Body Model, JEDEC JESD22-A114
2.0
ESD
Charged Device Model, JEDEC JESD22-C101
2.5
kV
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to absolute maximum ratings.
Symbol
Parameter
Conditions
Min. Typ. Max. Unit
V
CC
Bias Voltage
VCC to AGND
4.5
5.0
5.5
V
V
IN
Supply Voltage
VIN to PGND
3
24
V
FAN2106MPX
-10 +85
T
A
Ambient Temperature
FAN2106EMPX
-40 +85
°C
T
J
Junction Temperature
+125
°C
f
SW
Switching
Frequency
200 600
KHz
Thermal Information
Symbol
Parameter
Min. Typ. Max. Unit
T
STG
Storage Temperature
-65
+150
°C
T
L
Lead Soldering Temperature, 10 Seconds
+300
°C
P1 (Q2)
4
P2 (Q1)
7
JC
Thermal Resistance: Junction-to-Case
P3
4
°C/W
J-PCB
Thermal Resistance: Junction-to-Mounting Surface
35
(1)
°C/W
P
D
Power Dissipation, T
A
= 25°C
2.8
(1)
W
Note:
1. Typical thermal resistance when mounted on a four-layer, two-ounce PCB, as shown in Figure 26. Actual results
are dependent on mounting method and surface related to the design.
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Fault condition protection includes cycle-by-cycle current limiting and thermal shutdown. An
adjustable soft-start reduces the stress on the input source at startup. In shutdown mode the
regulator draws 20μA of supply current. The MP1583 requires a minimum number of
external components, providing a compact solution.
FEATURES
• 3A Output Current
• Programmable Soft-Start
• 100m�������������������������������
• Stable with Low ESR Output Ceramic Capacitors
• Up to 95% Efficiency
• 20μA Shutdown Mode
• Fixed 385KHz Frequency
• Thermal Shutdown
• Cycle-by-Cycle Over Current Protection
• Wide 4.75V to 23V Operating Input Range
• Output Adjustable from 1.22V to 21V
• Under-Voltage Lockout
MP2012 (U39)
The MP2012 is a fully integrated, internally compensated 1.2MHz fixed frequency PWM
step-down converter. It is ideal for powering portable equipment that runs from a single cell
Lithium-Ion (Li+) Battery, with an input range from 2.7V to 6V. The MP2012 can provide up
to 1.5A of load current with output voltage as low as 0.8V. It can also operate at 100% duty
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cycle for low dropout applications. With peak current mode control and internal
compensation, the MP2012 is stable with ceramic capacitors and small inductors. Fault
condition protection includes cycle-by-cycle current limiting and thermal shutdown. MP2012
is available in the small 6-pin 3mmx3mm QFN package.
2.7-6V Input Operation Range
Output Adjustable from 0.8V to VIN
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Up to 95% Efficiency
100% Duty Cycle for Low Dropout Applications
1.2MHz Fixed Switching Frequency
Stable with Low ESR Output Ceramic Capacitors
Thermal Shutdown
Cycle-by-Cycle Over Current Protection
Short Circuit Protection
Available in 6-pin 3x3mm QFN
LM1117 (U21-U22-U23-U24)
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5. MICROCONTROLLER(Broadcom)
BCM3556
a) General Description
The BCM3556 is the next generation of System-on-a-Chip (SoC) Digital Television (DTV)
products from Broadcom® with 1080p60 input and output capability targetedfor the EU
Market. It combines a high level of integration with best-of-class picture quality, enabling TV
manufacturers to reduce overall system cost (BOM) and improve picture quality, all with a
single SoC.
The BCM3556 combines DVB-T COFDM terrestrial and PAL/SECAM demodulators, two
DVI/HDMI receivers, a transport processor, a digital audio processor, 3D/2D graphics
processing, Ethernet MAC and PHY, digital processing of analog video and audio, analog
video digitizer and DAC functions, stereo high-fidelity audio DACs, a 400-MHz dual-
threaded MIPS processor, and a peripheral control unit providing a variety of television
control functions. The BCM3556 also features an advanced video decoder
capable of supporting high-definition AVC, VC-1, and DVB-T MPEG-2 streams.
The integration of the DVB-T COFDM terrestrial demodulator reduces the overall cost of the
external tuner module, resulting in cost savings for the customer. The BCM3556also
integrates four 10-bit ADCs with integrated front-end analog muxing that accept four CVBS
inputs, three S-video inputs, three component inputs, one PC input, one full SCART input
with fast blanking, and one Sound IF (SIF) input at the same time without the requirement for
any off-chip muxing ICs. The BCM3556 offers two HDMI 1.3a receivers, a motion adaptive
deinterlacer, HD Analog Noise Reduction, and an analog video decoder with 3D comb for
PAL and Y/C separation for SECAM.
The multiformat video decoder in the BCM3556 is capable of supporting high-definition
AVC, VC-1, and DVB-T MPEG-2 streams. AVC support is up to High Profile Level 4.1.
New tools in the AVC Fidelity Range extensions are supported, including 8x8 transform and
spatial prediction modes and adaptive quantization matrix. The video decoder also supports
high-definition VC-1 (Advanced Profile Level 3, Main, and Simple profiles) and DVB-
Tcompliant MPEG-2, Main Profile at Main and High Levels. The BCM3556 has an advanced
programmable audio processor capable of decoding a broad range of formats including Dolby
Digital, Dolby Digital Plus, AAC 5.1, AAC+ Level 2, AAC+ Level 4, WMA, and MPEG-1
Layer 1, 2, and 3 with simultaneous pass-through support.
The BCM3556 also supports 3D SRS Audio and includes an analog audio decoder for BTSC
and A2 formats. The BCM3556 also integrates an analog audio switch that accepts six stereo
inputs. In addition, the SoC supports SPDIF and I2S inputs. One SPDIF, two I2S, and three
analog audio outputs are available.
The SoC family also has an integrated advanced Picture Enhancement Processor (PEP) to
improve sharpening and perform picture post-processing functions (e.g., autoflesh, green
boost, black and blue stretch). The PEP engine is fully programmable and can be optimized
by the TV manufacturer to meet their respective quality requirements. Also integrated is a
video encoder for NTSC and an advanced 2D/3D graphics for OSD acceleration.
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