Circuit Description; Ac-Dc Converter; Scaling Controller - ViewSonic VA903b-3 VS11372 Service Manual

4. Circuit Description

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.
U801 is a PWM controller and provides many protection functions.
U802 is a photo couple to transfer the feedback signal from the second side which U803 detected both of
the output DC voltage on 5V and 24V.
Z802 detected the working voltage on U801 and Q802 would pull down the voltage on U801 pin5 to
shut down U801 if feedback loop was failed.
R828 would be a dynamic load which was active while backlight was turned off and system still
working on, this kept 24V output voltage under 32V to protect the panel.
power saving mode, the R828 would no loaded. This was detected by Z803 active the R828 to load or
not.
B，Scaling Controller
Overview
Realtek RTD2523B series products are all-in-one LCD monitor controllers support up to
SXGA/XGA(optional), and integrate Realtek high performance ADC, TMDS Rx(optional), scaling engine,
OSD engine, LVDS TX, RSDS TX and so on. Moreover, all products are pin compatible in low pin count
package to save cost and make the design easier
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
ADC_GND
ADC_REFIO
ADC_VDD
BLUE+
BLUE-
ADC_GND
SOG/ADC_TEST
GREEN+
GREEN-
ADCB_VDD
RED+
ViewSonic Corporation
Pin No
I/O
AG 27 ADC ground
AP 28 ADC band-gap voltage de-coupling
AP 29 Analog power
AI 30 Analog input from BLUE channel
AI 31
Analog input ground from BLUE channel
AG 32 ADC ground
AIO 33 SOG in/ADC test pin
AI 34 Analog input from GREEN channel
AI 35 Analog input ground from GREEN
channel
AP 36 Analog power
AI 37 Analog input from RED channel
Description
Confidential - Do Not Copy
16
After system went to
Note
1.20V
(3.3V)
(3.3V)
VA903b-1_ VA903m-1