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The IC enables the designer to set the operating frequency range of the converter by means of an externally programmable oscillator. This pin provides a precise 2 V reference and a resistor connected from this pin to GND defines a current that is used to set the minimum oscillator frequency.

Tie the pin to GND if the function is not used. Current return for both the low-side gate-drive current and the bias current of the IC. This input is not intended for a cycle-by-cycle control; hence the voltage signal must be filtered to get average current information.

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Layout carefully the connection of this pin to avoid too large spikes below ground. Schematic diagram Schematic diagram Figure 1. If the voltage on the pin reaches 2 V, the soft start capacitor is completely discharged so that the switching frequency daatasheet pushed to its maximum value and the ? An interface with the PFC controller is provided that enables to switch off the pre-regulator during fault conditions, such as OCP shutdown and DIS high, or during burst-mode operation.

If the current keeps on building up despite this frequency increase, a second comparator referenced at 1. The pin senses some voltage related to the feedback control, which is compared to an internal reference 1.


(PDF) L6599 Datasheet download

Bias the pin between 1. This dxtasheet is allowed for a maximum time set at pin 2. Current return for the high-side gate-drive current.

During UVLO, it is open.

Soft-start is not invoked. The comparator is provided with current hysteresis: As the voltage exceeds a 0.

High-voltage Resonant Controller

No abstract text available Text: LA datasheet, STMicroelectronics 3. In this way, under short circuit conditions, the converter will work intermittently with very low input average power.

Oscillator’s internal block diagram Linformation L Figure Oscillator’s internal block diagram. A fixed deadtime inserted between the turn-OFF of one switch and the turn-ON of the other one guarantees soft-switching and enables high-frequency operation.

This pin, normally open, is intended for stopping the PFC controller, for protection purpose or during burst-mode operation. The bootstrap capacitor connected between this pin and pin 14 OUT is fed by an internal synchronous bootstrap diode driven in-phase with the low-side gate-drive. The chip restarts switching as the voltage exceeds the reference by 50 mV. The voltage on the pin is top-limited by an internal zener. Output voltage regulation is obtained by modulating the operating frequency.

Under output short circuit, this normally results in a nearly constant peak primary current.

Functions Pin functions Name Function Soft start. As the voltage on the pin exceeds 3. ESD immunity for pins 14, 15 and 16 is guaranteed up to V 4. Activating the zener causes the IC to shut down not latched. Internally the pin connects a comparator that, when the voltage on the pin exceeds 1.


A voltage below 1. The pin senses the primary current though a sense resistor or a capacitive divider for lossless sensing. A capacitor and a resistor are connected from this pin to GND to set both the maximum duration of an overcurrent condition before the IC stops switching and the delay after which the IC restarts switching. Block Diagram and Schematic – – This Document can not be used without Samsung’s authorization – 8.

Every time the voltage on the ISEN pin exceeds 0. Schematic diagram 5 of 9. A current generator is ON as long as the voltage applied at datashewt pin is below 1.

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TRF SWRA digital power factor meter circuit diagram digital frequency meter circuit diagram microphone mixer schematic circuit diagram digital frequency meter “power factor measurement” dztasheet PIC Microcontroller Digital panel meter diagram using microcontroller SR schematic diagram of audio device c siemens MHz. This frequency shift is non linear to minimize output voltage overshoots; its duration is programmable as well.

Their combination offers complete protection against overload and short circuits. LApplication information L Figure