Hardware Introduction
2-20
overcurrent. Open circuit protection: When any of the strip lamps is open circuit, the
current feedback signal will be severely weak. If the feedback current does not stabilize
the CMP voltage even if the voltage of CMP rises to 3V, the IC will close two output
pulses and the circuit is locked for protection. Over current protection: When the output
current is too strong, the main IC will restrain the duty cycle of square wave after
receiving the feedback signal from the strip lamp to lower the current for protection.
Overvoltage protection: When the output voltage is too high, the main IC closes the PWM
driving after receiving the feedback signal from the strip lamp for protection.
Definitions of the output ports of strip lamp driver CN2 and CN3:
Definitions of the ports connected to CN1 and V/D board:
2.4.2. Working principle of the regulating board
The functional block diagram of the regulating board is shown in FIG 2-21.
The VGA signal is transmitted to RTD2620 and completes the identification, amplification
and color processing. The signal is transformed to LVDS signal and then transmitted to
the LCD screen. U6 (MTV412) is MCU, which is responsible for the control of RTD 2620
and control of external operations such as buttons. U1, U3 and U4 provide working
voltage for DC-DC convert.
Pin Definition
1
Vout -H
2
Vout -L
Pin Definition
1
13.5V
2
13.5V
3
ON/OFF
4
ADJ
5
GND
6
GND
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