Sharp Aquos LC-32LD166K, Service Manual

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LC-32LD164
LC-32LD165
LC-32LD166
The TAS5721 is a slave-only device, receiving all clocks from external sources. The TAS5721 operates with a PWM carrier
frequency between a 384-kHz switching rate and a 288-KHz switching rate, depending on the input sample rate. Oversampling,
combined with a fourth-order noise shaper, provides a flat noise floor and excellent dynamic range from 20 Hz to 20 kHz.
An integrated ground centered DirectPath™ combination headphone amplifier and 2VRMS line driver is integrated in the
TAS5721.
Features
• Audio Input/Output – 10 W x 2 into 8
Ω
With PVDD = 24 V
– Supports 2.0.
– Supports 8-kHz to 48-kHz Sample Rate (LJ/RJ/I
2
S)
– Integrated DirectPath™ Headphone Amplifier and 2 VRMS Line Driver
• Audio/PWM Processing
– Independent Channel Volume Controls With 24-dB to Mute in 0.5 dB Steps
– Separate Dynamic Range Control for Satellite and Sub Channels
– 21 Programmable Biquads for Speaker EQ
– Programmable Two-Band Dynamic Range Control
– Support for 3D Effects
• General Features
– I
2
C™ Serial Control Interface Operational Without MCLK
– Configurable I
2
C Address (0x34 or 0x36)
– Automatic Sample Rate Detection
– Thermal and Short-Circuit Protection
– Wide PVDD Supply Range (4.5 V to 24 V)
Applications
• LED/LCD TVs, Soundbar, Docking Stations, PC Speakers
Output Power vs. PVDD in 2.0 Mode
7.6. IC9101 (SSC9522S-TL)
General Description
The SSC9522S is a controller IC (SMZ method) for half-bridge resonant type power supply, incorporating a floating drive circuit
for High-side MOSFET drive.
※
SMZ = Soft-switched Multi-resonant Zero Current switch.
All switching periods work with soft switching operation.
The IC is in SOP18 package, and suitable for high performance power supply system with small size, high efficiency and low
noise, because for various power supply specifications, more effective and easier design works are achievable with effective
functions as the Automatic Dead Time Adjustment, the Uncontrollable Operation Detection and so on.
※
Uncontrollable Operation Detection = there are two areas in resonant circuit impedance; capacitance area and inductance
area. The Uncontrollable Operation occurs in capacitance area (the frequency is lower than the resonant frequency, fO), the
output voltage can not be controlled and the switching operation becomes hard switching.
Features
• SOP18 package
• Built-in floating drive circuit for High-side MOSFET
• Soft Start Function, reducing of power MOSFET stress and preventing Uncontrollable Operation, at startup
• Uncontrollable Operation Detection Function on pulse-by-pulse basis, improving the ability of transformer output wattage
because the frequency range is available up to the resonant frequency, fO, and reducing power MOSFET stress
• Automatic Dead Time Adjustment Function, not being necessary to make the dead time adjustment for each power supply
specification
• Protection Functions
- Line Undervoltage Protection Function-(Brown-In
／
Brown-Out Function)------------------Prevention of excessive input current
and overheat at low input voltage
- External Latch Function--------------------------------------Latch shutdown by external signal input
- Overcurrent Protection Function (OCP) ------------------Three steps protection corresponding to overcurrent levels
- Overvoltage Protection Function (OVP)------------------Latch shutdown
- Overload Protection Function (OLP) ----------------------Latch shutdown