1. High
temperature of chip
This
is mainly for high-voltage of the built-in power modulator driver IC. If the
current consumption of the IC is 2mA, 300V voltage is applied above the chip,
the chip's power consumption is 0.6 W. It will certainly cause the high
temperature above the chip. The maximum current of the driver chip is from
drive power consumption of the MOS tube. So think about better heat sink.
2. Power
tube high temperature
Power
consumption of the power tube is divided into two parts which are switching
loss and conduction loss. Note that most of the occasion especially LED
electric drive applications, switching damage is much larger than the
conduction loss. So try to reduce the frequency, however, you need to know that
when the frequency is reduced, in order to obtain the same load capacity, the
peak current is bound to large or inductance becomes large, which are likely to
cause the inductor into saturation region. If the inductor saturation current
is large enough, you can consider the CCM (continuous current mode) to change
into DCM (discontinuous current mode), so you need to add a load capacitance.
