(VA521/VE510s-2/VE510b-2 Realtek Scaler)
A. AC-DC CONVERTER
The power supply with a high-integrated green-mode PWM controller provides several features to enhance the
performance of power flyback converters.
I801 is a PWM controller and provides many protection functions.
I802 is a photo couple to transfer the feedback signal from the second side which I803 detected both of the output
DC voltage on 3.3V and 12V.
D813 detected the working voltage on I801 and Q805 would pull down the voltage on I801 pin5 to shut down
I801 if feedback loop was failed.
R826 would be a dynamic load which was active while backlight was turned off and system still working on, this
kept 12V output voltage under 13V to protect the panel. After system went to power saving mode, the R826
would no loaded. This was detected by I804 and Q803 active the R826 to load or not.
B. Scaling controller
The RTD2013 ADC is to convert RGB analog signal to digital signal that scaling chip can acknowledge.
The HSYNC input receives a logic signal and provides the frequency reference for pixel clock generation.
The scaling IC is to converts the input signal ranging from VGA to XGA into XGA resolution that panel can
acknowledge.
General
Embedded dual DDC support DDC1, DDC2B,DDC/CI
Zoom scaling up and down
Embedded Pattern Generator
No external memory required.
Require only one crystal to generate all timing
Embedded reset control output
Embedded crystal output to MICROP
3 channels 8 bits PWM output, and selectable PWM clock frequency.
PIN DESCRIPTION
(I/O Legend: A= Analog, I= Input, O=Output, P=Power, G=Ground)
■
ADC: 15 pins
Name I/O
Pin
No
Description
Note
ADC_ GND
AG
27
ADC ground
ADC_REFIO
AP
28
ADC band-gap voltage de-coupling
1.20V
ADC_VDD AP
29
Analog
power
(3.3V)
BLUE+
AI
30
Analog input from BLUE channel
BLUE-
AI
31
Analog input ground from BLUE channel
ADC_ GND
AG
32
ADC ground
SOG/ADC_TEST
AIO
33
SOG in/ADC test pin
GREEN+
AI
34
Analog input from GREEN channel
GREEN-
AI
35
Analog input ground from GREEN channel
ADCB_VDD AP
36
Analog
power
(3.3V)
RED+
AI
37
Analog input from RED channel
RED_
AI
38
Analog input ground from RED channel
ADC_GND AG
39
Analog
ground
ADC_GND AG
40
Analog
ground
ADC_VDD AP
41
Analog
power
(3.3V)
AHS
AI
42
Analog HS input
(10), (4), (5)
AVS
AI
43
Analog VS input
(2), (4), (5)
4. Circuit Description
10
ViewSonic
Corporation
Co
nfidential
-
Do
Not
Copy
VA
521
VE510b/s-2
Содержание ve510b/s-21
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