8751-CA-NS GE Module card controller equipment

8751-CA-NS GE Module card controller equipment

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The A, C and E types of the S-8520/8521 Series have a built-in overload protection circuit.

If the output voltage drops under the overload status, the maximum duty status (100%) continues. If this 100% duty

status lasts longer than the overload detection time (tpro), the circuit keeps the EXT pin at “H” to protect the

switching transistor and inductor. When the overload protection circuit is functioning, the soft start works in the IC

for the reference voltage, and the reference voltage rises slowly from 0 V. The reference voltage and the feedback

voltage obtained by dividing the output voltage are compared to each other. While the reference voltage is low, the

EXT pin keeps “H” and oscillation stops. If the reference voltage rises and exceeds the feedback voltage, oscillation

restarts.

After oscillation is restarted, if a load is heavy and the EXT pin keeps the “L” level longer than the overload

detection time (tpro), the circuit operates again, and the IC enters the intermittent operation mode by repeating the

action described above. Once the overload state is off, the IC restarts the normal operation.