UANTA COMPUTER INC. L5TD Monitor
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4.1.3 Power reference AIC1739 (Q3)
The AIC1739 is a 2.5V voltage provider. It could support maximum 100mA current capability. The 2.5V reference was for
scaler MST8016 reference. The voltage was very important for this all the function that MVZ have.
4.2 Inverter/Power/Audio Board
This is a specific inverter/Power/Audio module for L5TD monitor with backlight/EE parts/audio function.
4.2.1 Inverter function
The inverter converters 12 Vdc to drive two cold cathode fluorescence tubes. Electrical specification described as below.
Rated Input Voltage 12Vdc (L5EP)
INPUT
Maximum Input Voltage 11.4~12.6 Vdc
Input Current <1. 2A
Off state Input Power < 0.1 W
On / Off Voltage 20~98 % duty cycle
Rated Output Strike-on Voltage 1100 Vrms
OUTPUT
Rated Output Voltage 675 Vrms at 7.5 mA
Rated Output Frequency 50~60KHz
Rate Output Current per tube 7.5 mA
4.2.2 Adapter
This is a general purpose AC / DC adapter which converter 90~240 Vac to a stabilized DC voltage 12 V
with rated output current of 3A . Electrical specification described as below
Rated Input Voltage 100~240 Vac , 50/60 Hz
INPUT
Operation Input Voltage 90~264 Vac, 47~63 Hz
Input Current < 1.0A
Inrush Current (Cold Start) < 50A @ all input range
Standby Input Power < 1.0 W (3.3V 30mA)
Rated Output Voltage 12 Vdc and 3.3Vdc
OUTPUT
Output Voltage Regulation + 5 / -5 % and
Output Ripple and Noise < 120 and 100 mVp-p
Rate Output Current < 250mA and 2.0A
Turn-on Delay < 1 Second
4.2.3 Audio amplifier TDA7496
The TDA7496 on the power board is a 2 channel audio power amplifier capable of delivering 1W of continuous average power
to an 8 ohms with less than 10% (THD) from a 12 V power supply.
TDA7496 can directly drive 8 ohms speaker , does not require output coupling capacitor, bootstrap capacitor
,or snubber network. Audio line-in are feed into pin 4,8 of the AN7522. The output power is controlled by
the DC voltage of pin 39 from MTV312 I / O port.
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L5TD Service Menu Rev 1B Page: 16
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