DMO565R DATASHEET PDF

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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In this condition, Vfb continues increasing until it reaches 6V, when the switching operation is terminated as shown in Figure 7.

DMOR Datasheet PDF – Fairchild Semiconductor

Burst mode operation alternately enables and disables switching of the power Sense FET thereby reducing switching loss in Standby mode. Assuming that the 0. 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.

TempShutDown Delay Current vs. If the voltage of this pin reaches 6. This causes Vcc to fall. In order to avoid undesired activation of OVP during normal operation, Vcc should be designed to be below 19V.

DMO565R 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. 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.

Ql5 datasheet pdf QL5 datasheet, It is designed to drive the transformer directly. For stable operation, a capacitor should be placed between this pin and GND. TempFeedback Source Current vs. This pin is the positive supply voltage input. This reduces the current through the opto-coupler LED, which also reduces the opto-coupler transistor current, thus increasing the feedback voltage Vfb.

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Excessive voltage across the Rsense resistor would lead to incorrect feedback operation in the current mode PWM control. This pin is internally connected to the inverting input of the PWM comparator.

When the djo565r pin voltage of the KA exceeds the internal reference voltage of 2. Cdbe datasheet pdf – datasheet pdf Cdbe datasheet pdf In order to avoid this undesired operation, the over load protection circuit is designed to be activated after a specified time to determine whether it is a transient situation or an overload situation.

This causes the feedback voltage to rise. As the load decreases, the feedback voltage decreases. If the fmo565r consumes beyond this maximum power, the output voltage Vo decreases below the set voltage. This device is a basic platform well suited for cost effective designs of flyback converters. When Vcc reaches 12V, dmi565r internal high voltage current source is disabled and dayasheet power is supplied from the auxiliary transformer winding.

Qlt datasheet pdf – datasheet pdf QLT datasheet, Once the fault condition occurs, switching is terminated and the Sense FET remains off. The feedback voltage then falls and the process repeats. Because these protection circuits are fully integrated into the IC without external components, the reliability can be improved without increasing cost.

DMOR Datasheet –

The PWM controller includes integrated fixed frequency oscillator, under voltage lockout, leading edge blanking LEBoptimized gate driver, internal soft start, temperature compensated precise current sources for a loop compensation and self dagasheet circuitry. The collector of an opto-coupler is typically tied to dxtasheet pin.

In this situation, the protection circuit should be activated in order to protect the SMPS. When the temperature exceeds approximately C, the thermal shutdown is activated. Ql5 datasheet pdf -?

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In this manner, the auto-restart can alternately enable and disable the switching of the power Sense FET until the fault condition is eliminated see Figure 6. Once Vcc reaches 12V, the internal current source is disabled. Since D1 is blocked when the feedback voltage Vfb exceeds 2. This pin is the control ground and the Sense FET source.

In order to prevent this situation, an over voltage protection OVP circuit is employed. Comparing the feedback voltage with the voltage across the Rsense resistor plus an offset voltage makes it possible to control the switching duty cycle.

Datasheet Release Date An opto-coupler such as the H11AA and shunt regulator such as the KA are typically used to implement the feedback network. At this point switching stops and the output voltages start to drop at a rate dependent on standby current load.

Therefore, the peak value of the current through the Sense FET is limited. The voltage on the output capacitors is progressively increased with the intention of smoothly establishing the required output voltage. When Vcc reaches the UVLO stop voltage, 8V, the protection is reset and the internal high voltage current source charges the Vcc capacitor via the Vstr pin.

If the secondary side datashete circuit were to malfunction or a solder defect caused an open datasehet the feedback path, the current through the opto-coupler transistor becomes almost zero. 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.