Unnecessary
Discharge current reduced
Fig.6 Resonance Condenser Discharge Current at ON
3-3
Protection Circuits
1
Load-Shorting Protection
Inclusion of a load current reduction circuit enables reduction in heating under load and
alleviates stress on the device.
2
Protection Against Malfunction at ON
The Leading Edge Blank (LEB) prevents malfunctions in the over-current detect circuit
due to discharge current in the partial resonance condenser at ON.
3
Protection Against Malfunction at OFF
Inclusion of the ON-dead timer prevents malfunctions at OFF.
This function ensures that resonant oscillation due to the leakage inductance and the
resonance condenser at OFF, are recognized as trigger signals, and trigger input is then
masked to prevent switching ON again.
4
Over-current Protection
Over-current protection for the device consists of pulse-by-pulse over-current protection
to detect primary current, and a limitation on the ON width.
Password Vol.02-06-e MR2000 Series
P
.05
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