DMO365R DATASHEET PDF

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Advanced Burst-Mode Operation. Related Application Notes. FET, and is specifically designed for high performance off-line. Both devices are integrated high voltage power. The inte-. When com-. Both devices pro-. Adapt- Open. Notes :. Typical continuous power in a non-ventilated enclosed. Maximum practical continuous power in an open frame. Typical Circuit. Vstr Drain. Vfb Vcc Source. Electrical Characteristics. Zero-Gate-Voltage Drain Current.

I DSS. Drain-Source On-State Resistance 1. Input Capacitance. Output Capacitance. Reverse Transfer Capacitance. Turn-On Delay Time. Rise Time. Turn-Off Delay Time. Fall Time. Switching Frequency. Switching Frequency Modulation. Switching Frequency Variation 2. Maximum Duty Cycle. Minimum Duty Cycle. Feedback Source Current.

Internal Soft Start Time. Burst Mode Voltage. Peak Current Limit. Current Limit Delay Time 3. Thermal Shutdown Temperature.

Shutdown Feedback Voltage. Over Voltage Protection. Shutdown Delay Current. Leading Edge Blanking Time. Operating Supply Current control part only.

Start-Up Charging Current. Vstr Supply Voltage. R DS ON. C ISS. C OSS. C RSS. D MAX. D MIN. V STOP. V BURH. V BURL. I LIM. V OVP. V STR. Note :. These parameters, although guaranteed, are tested in EDS wafer test process. Sense FET current after it starts up. The typical soft start. The pulse width to the power switching. The voltage on the output capacitors is progressively.

It also helps to prevent transformer. Drain current. Current limit. Figure 8. Soft Start Function. I BUR pk. Figure 9. Burst Operation Function. Burst Operation : In order to minimize power dissipation. Switching still continues but the current. The fixed current limit is larger than that. Switching continues until the feedback voltage. At this point switching stops.

This causes the feedback voltage to. The feedback voltage then falls and the process repeats. Burst mode operation alternately enables and disables. Frequency Modulation : Modulating the switching fre-. The amount of EMI reduction is. Frequency modulation allows. Figure Frequency Modulation Waveform. Both devices are integrated high voltage power switching regulators which combine an avalanche rugged Sense FET with a current mode PWM control block.

Both devices pro- vide a basic platform that is well suited for the design of cost- effective flyback converters. These parameters, although guaranteed, are tested in EDS wafer test process 3.

The typical soft start time is 15msec, as shown in Figure 8, where progressive increments of the Sense FET current are allowed during the start-up phase. The pulse width to the power switching device is progressively increased to establish the correct working conditions for transformers, inductors, and capaci- tors.

The voltage on the output capacitors is progressively increased with the intention of smoothly establishing the required output voltage. It also helps to prevent transformer saturation and reduce the stress on the secondary diode.

Drain current 2. Burst Operation Function 6. Burst Operation : In order to minimize power dissipation in standby mode, the FPS enters burst mode operation. As the load decreases, the feedback voltage decreases. Switching still continues but the current limit is set to a fixed limit internally to minimize flux density in the transformer. At this point switching stops and the output voltages start to drop at a rate dependent on the standby current load.

This causes the feedback voltage to rise. Burst mode operation alternately enables and disables switching of the power Sense FET thereby reducing switch- ing loss in Standby mode. Frequency Modulation : Modulating the switching fre- quency of a switched power supply can reduce EMI. Fre- quency modulation can reduce EMI by spreading the energy over a wider frequency range than the bandwidth measured by the EMI test equipment.

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