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All of the ground connections of the bias components should be tied to a track going to this pin and kept separate from any pulsed current return. This patented structure replaces the normally used external diode.

In this way, under short circuit conditions, the converter will work intermittently with very low input average power.

schematic diagram l datasheet & applicatoin notes – Datasheet Archive

A is kept always on. Ratasheet input is not intended for a cycle-by-cycle control; hence the voltage signal must be filtered to get average current information. This function realizes burst-mode operation when the load falls below a level that can be programmed by properly choosing the resistor connecting the optocoupler to pin RFmin see block diagram.

The pin senses the primary current though a sense resistor or a capacitive divider for lossless sensing. The information is latched and it is necessary to recycle the supply voltage of the IC to enable it to restart: L Pin functions continued N.


Output voltage regulation is obtained by modulating the operating frequency. No abstract text available Text: Tie the pin to GND if the function is not used.

L6599 Datasheet PDF

Activating the zener causes the IC to shut down not latched. If the voltage on the pin reaches 2 V, the soft start capacitor is completely discharged so that the switching frequency is pushed to its maximum value and the ? High-side floating gate-drive output. Current return for the high-side gate-drive current. A voltage below satasheet.

Current return for both the low-side gate-drive current and the bias current of the IC. The board provides one. Delayed shutdown upon overcurrent.

This frequency shift is non linear to minimize output voltage overshoots; its duration is programmable as well. A higher level OCP latches off the Catasheet if the first-level protection is not sufficient to control the primary current. The region on the left-hand side of the diagram in Figure 5, i. Schematic diagram 5 of 9. If the current keeps on building ddatasheet despite this frequency increase, a second comparator referenced at 1. Try Findchips PRO for schematic diagram l The pin is not internally connected to isolate the high-voltage pin and ease compliance with safety regulations creepage distance on the PCB.

The driver is capable of 0. Under output short circuit, this normally results in a nearly constant peak primary current.


The IC will be soft-restarted as the voltage drops below 0. Bypass the pin with a capacitor to GND to reduce noise pick-up.

High-voltage Resonant Controller

A current generator and is slowly discharged by the external resistor. A fixed deadtime inserted between the turn-OFF of one switch ratasheet the turn-ON of the other one guarantees soft-switching and enables high-frequency operation.

The IC enables the designer to set the operating frequency range of the converter by means of an externally programmable oscillator.

The bootstrap capacitor connected between this pin and pin 14 OUT is fed by an internal synchronous bootstrap diode driven in-phase with the datasbeet gate-drive. The input section is provided withLa double ended primary controller for resonant half-bridge ZVS zero voltage switching.

L Datasheet(PDF) – STMicroelectronics

To close the feedback loop that regulates the converter output voltage by modulating the oscillator frequency, the phototransistor of an optocoupler will be connected to this pin through a resistor. 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.

High-side gate-drive floating supply Voltage.