Service manual

4. Circuit Description

ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2

2. Electronic Circuit Theory

2.1 Switching Mode Power Supply

2.1.1 AC Current Input Circuit

P801 is a connector for connecting AC Power. F801 is a fuse to protect all the circuit. AC input voltage is from

90V to 264V. R820 and R821 joined between two inputting main circuit to prevent man from shock. L801 is used to

clear up low frequency wave. C801 and C806 are used to discharge the waves that L801 produced. High

frequency waves are damped by C801 and C806. D801 is a rectifier which composed of 4 build-in diodes, it inverts

AC to DC.

2.1.2 High Voltage to Low Voltage Control Circuit

C805 is used to smooth the wave from rectifier. IC802 is a highly integrated PWM controller, which build-in a

power MOSFET. When rectified DC high voltage is applied to the DRAIN pin during start-up, the MOSFET is off

initially, and the CONTROL pin capacitor is charged through a switched high voltage current source connected

internally between the DRAIN and CONTROL pins. When the CONTROL pin voltage Vc reaches approximately

5.8V, the control circuitry is activated and the soft-start begins. The soft-start circuit gradually increases the duty

cycle of the MOSFET from zero to the maximum value over approximately 10ms. If no external feedback/supply

current is fed into the CONTROL pin by the end of the soft-start, the high voltage current source is turned off and

the CONTROL pin will start discharging in response to the supply current drawn by the control circuitry.

Resistor R803, R807, R824 and R825 are for line over voltage shut-down (OVP) and line under-voltage

detection (UVP).Resistors R801, R805, R822, and R823 are for external current limit adjustment, and used to

reduce the current limit externally to a value close to the operating peak current of primary about 1.35A. The mean

is power will protected when the primary current over about 1.35A.

When PWM is turned off, the main current flow will be consumed through D804 and ZD802, This will prevent

MOSFET which built-in IC802 from being damaged under large current impulse and voltage spike.

D806 and C815 provide internal Auxiliary current to CONTROL pin during normal operation. In addition, error

amplifier and feedback current to the CONTROL pin are for duty cycle control.

2.1.3 DC_5V and DC_14V Output Circuit

For DC 5V, D805 is used to rectify the inducted current. R806 and C811 are used to store energy when current

is reversed. The parts including C812, C814, C822, C821, B801 and L803 are used to smooth the current waves.

For DC 14V, D803 is used to rectify the inducted current. R802 and C802 are used to store energy when

current is reversed. The parts including C808, C810 and L802 are used to smooth the current waves.

2.1.4 Feedback and OVP Protect Circuit

Pin R of IC803 is supplied 2.5V stable voltage. It is connected to 5V and 14V output through R811,

R810 and R818. R811, R810 and R818 are output sampling resistor. When the sampling voltage more

than 2.5V or less than 2.5V, feedback current of IC802 will change, this can change the voltage from

transformer T801.

Q802, R827, R828 and ZD801 make up of dummy loading circuit. For start-up sequence, during 5V

output take place high loading first, this dummy loading circuit operated to insure 14V not be increased.