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ViewSonic Corporation
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16
4. Circuit Description
4.1 Switching Mode Power Supply
4.1.1 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.
4.1.2High 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.
4.1.3DC_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.
4.1.4Feedback 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.
For 5V
DC
output OVP, ZD803 is a zener diode, when 5V output voltage becomes up to 5.6V, the
VA702-2_VA721-3_VA721b-3