M51977P

Product Summary

Mitsubishi IC type M51977P,FP are the off-line primary PWR controller which are especially designed for SMPS to get the regulated DC voltage from AC power supply.
As the tetmpole type high power-driver-circuit is integrated in these IC,these IC can drive the MOS-FET with fast rise and fast fall output pulse.
Type M51977P,FP have the functions of not only high frequency OSC and fast output drive but also current limit with fast response an high sensibility so the true "fast switching regurator" can be realized.
They have another big features of current protection to short and over current at secondary side,owing to the integrated timer type protection-circuit,if few parts are added to the primary circuit.

Parametrics

Absolute Maximum Ratings:
(1)Supply voltage:31V;
(2)Collector voltage:31V;
(3)Output current:Peak=±2A;Continuous:0.15A;
(4)VF terminal voltage:Vcc V;
(5)ON/OFF terminal voltage:Vcc V;
(6)CLM-terminal voltage:-4.0~+4.0V;
(7)CLM+terminal voltage:-0.3~+4.0V;
(8)OVP terminal voltage:Vcc V;
(9)DET terminal voltage:6(Note1) V;
(10)DET terminal input voltage:5(Note1) V;
(11)F/B terminal voltage:0~10V;
(12)T-ON terminal input current:-1mA;
(13)T-Off terminal input current:-2mA;
(14)Power dissipation,Ta=25℃:1.5W;
(15)Thermal derating factor,Ta>25℃:12mW/℃;
(16)Operating temperature:-30~+85℃;
(17)Storage temperature:-40~+125℃;
(18)Junction temperature:150℃
Note:1.This terminal has the costant voltage characteristic of 6~8V.When current is supplied from outside.The maximum allowable voltage is 6V when the constant voltage is applied to this terminal.And maximum allowable current into this terminal is 5mA.

Features

(1)500kHz operation of MOS-FET:Output current of ±2A;Fast rise time of 60ns and fast fall time of 40ns;small through current owing to "modified to tempole driver circuit.";
(2)Compact and light-weight power supply:Small start-up current:80μA tyy;Big difference between "start-up voltage" and "stop voltage" makes the smoothing capacitor of the power input section small.Start-up threshold 16V,stop voltage 10V.;Packages with high power dissipation are used to withstand the heat generated by the gate-drive current of MOS FET;16-pin DIP,20-pin SOP 1.5W(at 25℃);
(3)Simpilified peripheral circuit with protection circuit and built-in large capacity totempole output.High speed current limiting circuit using pulse-by-pulse method(Two systems of CLM+pin,CLM-pin);Protection by intermittent operation of outout iver current:Timier protection circuit;Over-voltage protection circuit(OVP);Protection circuit for output miss action at low supply voltage (UVLO);
(4)High-performance and highly functional power supply:Triangular wave oscillator for easy dead time setting

Diagrams

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