MP6002 – MONOLITHIC FLYBACK/FORWARD DC-DC CONVERTER

MP6002 Rev. 1.0

www.MonolithicPower.com

9

12/4/2013

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© 2013 MPS. All Rights Reserved.

Limiting the duty cycle at high line voltage

protects against magnetic saturation and

minimizes

the

output

sensitivity

to

line

transients.

Auto-Restart

and an open loop condition occurs, the voltage

crosses the threshold voltage, the auto-restart

circuit turns off the power switch and puts the

turns off and the standby current discharges

cycles between the two threshold voltages 15

times, the auto-restart circuit is disabled and the

controller begins soft-start.

Over Current Protection

The MP6002 has cycle-by-cycle over current

limit when the internal switch current peak value

exceeds the set current limit threshold.

Meanwhile, the output voltage starts to drop

until FB is below the Under-Voltage (UV)

threshold, typically 33% below the FB reference.

Once a UV is triggered, the MP6002 enters

hiccup mode to periodically restart the part (the

MP6002 turns off the switch until Vcc repeats

the ramp cycles between 4.5V to 6V for 15

times). This protection mode is especially useful

when the output is dead-short to ground. The

average short circuit input current is greatly

reduced to alleviate the thermal issue and

protect the regulator. The MP6002 exits the

hiccup mode once the over current condition is

removed.