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A capacitor connected from this pin to GND is charged and discharged by internal current generators programmed by the external network connected to pin 4 RFmin and determines the switching frequency of the converter.

As the voltage on the pin exceeds 3.

High-voltage Resonant Controller

Bypass the pin with a capacitor to GND to reduce noise pick-up. The information is latched and it is necessary to recycle the supply voltage of the IC to enable it to restart: Under output short circuit, this normally results in a nearly constant peak primary current.

An R-C series connected from this pin to GND sets frequency shift at start-up to prevent excessive energy inrush soft-start. The IC enables the designer to set the operating frequency range of the converter by datsaheet of an externally programmable oscillator.

The board provides one. Delayed shutdown upon overcurrent. Pin settings Pin functions continued Name Function Minimum oscillator frequency setting. Layout carefully the connection of this pin to avoid too large spikes below ground. IC’s functions include a not-latched active-low disable input with current hysteresis useful for power sequencing or for brownout protection, a current sense input for OCP with frequency shift and delayed shutdown with automatic restart. This patented structure replaces the normally used external diode.

To dtaasheet the high-side switch with the bootstrap approach, the IC incorporates a high-voltage floating structure able to withstand more than V with a synchronous-driven high-voltage DMOS that replaces the external fast-recovery bootstrap diode. Leave the pin unconnected if not used.


The comparator is provided with current hysteresis: The pin is to be connected to the high-voltage l6599 bus with a resistor divider to perform either AC or DC in systems datashee PFC brownout protection. 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.

In this way, under short circuit conditions, the converter will work intermittently with very low input average power. This frequency datasheett is non linear to minimize output voltage overshoots; its duration is programmable as well. 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. At start-up, to prevent uncontrolled inrush current, the switching frequency starts from a programmable maximum value and progressively decays until it reaches the steady-state value determined by the control loop.

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The pin senses some voltage related to the feedback control, which is compared to an internal reference 1. During UVLO, it is open.

(PDF) L6599 Datasheet download

Block Diagram and Schematic – – This Document can not be used without Samsung’s authorization – 8. Block Diagram and Schematic.

Functions Pin functions Name Function Soft start. The driver is capable of 0.

L datasheet, Pinout ,application circuits High-voltage Resonant Controller

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L Auxiliary power supplyTracking boost operation n Voltage feed-forward n Inductor saturation detector n L A current datashedt is ON as long as the voltage applied at the pin is below 1.


Soft-start and delayed shutdown upon overcurrent timing diagram-Delay C Delay 0. This pin, normally open, is intended for stopping the PFC controller, for protection purpose or during burst-mode operation.

Soft-start is not invoked. A voltage below 1. Supply Voltage of both the signal part of the IC and datsheet low-side gate driver. High-side gate-drive floating supply Voltage.

Internally the pin connects a datashet that, when the voltage on the pin exceeds 1. The region on the datashewt side of the diagram in Figure 5, i. Oscillator’s internal block diagram.

Try Findchips PRO for schematic diagram l The chip restarts switching as the voltage exceeds the reference by 50 mV. Tie the pin to RFmin if burst-mode is not used. Schematic diagram Schematic diagram Figure 1. The IC can be forced to enter a controlled burst-mode operation at light load, so as to keep converter’s input consumption to a minimum.

Activating the zener causes the IC to shut down not latched. Current return for both the low-side gate-drive current and the bias current of the IC. 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. If the voltage on the pin is lower than the reference, the IC enters an idle state and its quiescent current is reduced. Tie the pin to GND if the function is not used. 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.