Training course: D44
12
SEES Engineering Department
2. Block Diagrams
(continued)
Main ICs
IC1301: DIGITAL AUDIO POWER AMPLIFIER
Part Number:
YDA147-SZE2
SHARP Code:
VHIYDA147SZ-1Y
This IC is a Stereo 20W (10W+10W) digital audio power amplifi er. The IC is class D amplifi er equipped with the function for the dynamic self-adjust-
ment of the output volume in proportion to the amplitude of the input signal. The company calls the function of automatic adjustment of the installed
output volume “DRC (dynamic range compression)”.
The modulation method adopted PWM. An external LC fi lter is unnecessary. It only has to supply the output signal directly to the speaker. It has the
output control function to prevent an excessive input to the speaker. The maximum output electric power can be set to an arbitrary size by external
resistance. Besides this, the protection function to overheating and the overcurrent was installed.
The switching operation of power MOS-FET is installed and the technology that carefully controls the slewing rate is installed. Moreover, the auto-
matic offset calibration circuit that suppresses the pop noise when the power supply starts is built into.
IC8103: LCD CONTROLLER
Part Number:
T3Z18AFG-0003
SHARP Code:
VHIT3Z18AFG-1Q
This IC is a custom Gate Array of Toshiba. The alias of this IC is EAGLE2 and is marked as SHARP. This IC is generating all the necessary timing
signals for controlling the panel and the RSDS interface for data..
IC8101: NVM 256Kb -E2PROM FOR LCD CONTROLLER (IC8103)
Part Number:
M24256-BWMN6TP
SHARP Code:
VHIM-1L
The BR24256B is a 2-wire (I2C bus type) serial EEPROM that is electrically programmable. This IC stores all data related to the LCD Controller
(Gamma, timings, etc…).
