JVC I'Art AV-27MF36, Тренировка по блоку питания, Страница: 25 / 110

Startup: When we apply approximately 12V to pin4, the IC’s internal circuit functions and
turns ON the FET
Drive: When the internal circuit is turned on, the driver circuit turns ON the power FET
Power FET: This is what we previously called the Switch. We use this to allow current to flow
through the transformer.
Oscillator: The IC has an Oscillator for timing control. This oscillator decides its natural on/off
time. This means, after applying the startup DC, after a pre-determined time it will come on.
OCP/FB: This is the control input to override the oscillator’s timing. By applying a 0.7V to this
input, we can turn OFF the internal circuit and FET. By applying a 2.0V pulse, we can turn it
back ON.
TSD: Thermal Shut Down: This is for the thermal protection. When the IC overheats, this
circuit turns off the IC and latches it. We have to unplug the power to restart.
OVP: The OVP circuit monitors the startup DC. If the voltage exceeds the specified level, it
turns off the IC and latches it. We need to unplug the power to restart.
Latch: This is the latch circuit that latches and holds the shut down circuit outputs.