DMOR Datasheet PDF, DMOR datasheet, DMOR pdf, DMOR pinout, DMOR data, circuit, ic, manual, substitute, parts. Description. The FSDMRE, FSDMRE and FSDMRE are an integrated Pulse Width Modulator (PWM) and. SenseFET specifically designed for. Features. • Optimized for Quasi-Resonant Converter (QRC). • Advanced Burst- Mode Operation for under 1W Standby. Power Consumption. • Pulse-by-Pulse.

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Then, Vfb climbs up in a similar manner to the over load situation, forcing the preset maximum current to be supplied to the SMPS until the over load protection is activated.

This pin is connected directly to the high voltage DC link. At the instant the internal Sense FET is turned on, there usually exists a high current spike through the Sense FET, caused by primary-side capacitance and secondary-side rectifier reverse recovery. Published on Apr View Cdbe datasheet pdf – datasheet pdf Cdbe datasheet pdf Because more energy than required is provided to the output, the output voltage may exceed the rated voltage before the over load protection is activated, resulting in the breakdown of the devices in the secondary side.

Rockchip RK datasheet V0. TempFeedback Source Current vs. As the load decreases, the feedback voltage decreases. This device is a basic platform well suited for cost effective designs of flyback converters. Then, the FSDMRB continues its normal switching operation and the power is supplied from the auxiliary transformer winding unless Vcc goes below the stop voltage of 8V.

Typical continuous power in a non-ventilated enclosed adapter measured at 50C ambient. This causes Vcc to fall. Therefore, the peak value of the current through the Sense FET is limited. In order to avoid undesired activation of OVP during normal operation, Vcc should be designed to be below 19V. Pulse width modulation PWM circuit2.


When Vcc reaches the UVLO dtaasheet voltage, 8V, the protection is reset and the internal high voltage current source charges the Vcc capacitor via the Vstr pin. This parameter is the current flowing into the control IC. Compared with discrete MOSFET and PWM controller solution, it can reduce total cost, component count, size and weight simultaneously increasing efficiency, productivity, and system reliability.

The voltage on the output capacitors is mdo565r increased with the intention of smoothly establishing the required output voltage. TempShutDown Delay Current vs. This causes the feedback voltage to rise. This event typically happens when the input voltage is increased or the output load is decreased. If the voltage datashwet this pin reaches 6.

Assuming that the 0. Pulse width limited by maximum junction temperature 2.

Qlt datasheet vatasheet – datasheet pdf QLT datasheet, Overload is defined as the load current exceeding a pre-set level due to an unexpected event. Over load protectiontNormal operation Fault situation Normal operationFigure 6. The typical soft start time is 10msec, The pulse width to the power switching device is progressively increased to establish the correct working conditions for transformers, inductors, and capacitors. Free standing with no heat-sink under natural convection.

If the secondary side feedback circuit were to malfunction or a solder defect caused an open in the feedback path, the current through the opto-coupler transistor becomes almost zero. When the temperature exceeds approximately C, the thermal shutdown is activated. Comparing the feedback voltage with the voltage across the Rsense resistor plus an offset voltage makes it possible to control the switching duty cycle. Because of the pulse-by-pulse current limit capability, the maximum peak current through the Sense FET is limited, and therefore the maximum input power is restricted with a given input voltage.


This pin is the positive supply voltage input. At startup, an internal do565r voltage current source supplies the internal bias and charges the external capacitor Cvcc that is connected to the Vcc pin as illustrated in Figure 4. In this condition, Vfb continues increasing until it reaches 6V, when the switching operation is terminated as shown in Figure 7.

In order to avoid this undesired operation, the over load protection ratasheet is designed to be activated after a specified time to determine whether it is a transient situation or an overload situation.

DMOR Datasheet PDF – Fairchild Semiconductor

For stable operation, a capacitor should be placed between this pin and GND. The collector of an opto-coupler is typically tied to this pin.

These parameters, although guaranteed at the design, are not tested in mass production. During start up, the power is supplied by an internal high voltage current source that is connected to the Vstr pin.

In order to prevent this situation, an over voltage protection OVP circuit is employed.

DMO565R View Datasheet(PDF) – Fairchild Semiconductor

These parameters, although guaranteed, are tested in EDS wafer test process. Because these protection circuits are fully integrated into the IC without external components, the reliability can be improved without increasing cost. SN datasheet – Texas Instruments Documents. In this situation, the protection circuit should be activated in order to protect the SMPS.