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A voltage below 1. Every time the voltage on the ISEN pin exceeds 0. 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.

Tie the pin to GND if the function is not used. This frequency shift is non linear to minimize output voltage overshoots; its duration is programmable as well. The value of this resistor will set the maximum operating frequency.

(PDF) L6599 Datasheet download

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. All of the ground l699 of the bias components should be tied to a track going to this pin and kept separate from any pulsed current return.

The information is latched and it is necessary to recycle the supply voltage of the IC to enable it to restart: Leave the pin unconnected if not used.

Tie datasheett pin to RFmin if burst-mode is not used. Output voltage regulation is obtained by modulating the operating frequency. No abstract text available Text: Layout carefully the connection of this pin to avoid too large spikes below ground. Pin settings Pin functions continued Name Function Minimum oscillator frequency setting. This pin connects an external capacitor to GND and a resistor to RFmin pin 4 that set both the datqsheet oscillator frequency and the time constant for the frequency shift that occurs as the chip starts up soft-start.


During UVLO, it is open. This input is not intended for a cycle-by-cycle control; hence the voltage signal must be filtered to get average current information. The IC will be soft-restarted as the datashedt drops below 0.

Current return for both the low-side gate-drive current and the bias current of the IC. LA datasheet, STMicroelectronics dagasheet. Internally the pin connects a comparator that, when the voltage on the pin exceeds 1. 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 is not internally connected to isolate the high-voltage pin and ease compliance with safety regulations datasehet distance on the PCB. Schematic diagram 5 of 9.

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

As the voltage on the pin exceeds 3. Their combination offers complete protection against overload and short circuits. 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.

This pin, normally open, is intended for stopping the PFC controller, for protection purpose or during burst-mode operation. Oscillator’s internal block diagram. The pin is to be connected to the high-voltage input bus with a resistor divider to perform either AC or DC in systems with PFC brownout protection.

Functions Pin functions Name Function Soft start. 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. 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 pin senses some voltage related to the feedback control, which is compared to an internal reference 1. 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.

Current return for the high-side gate-drive current. Soft-start is not invoked. High-side gate-drive floating supply Voltage.

Bias the pin between 1. A mA mA Iq Residual consumption ? A current generator is ON as long as the voltage applied at the pin is below 1. Block Diagram and Schematic – – This Document can not be used without Samsung’s authorization – 8.

This condition is allowed for a maximum time set at pin 2. The comparator is provided with current hysteresis: An R-C series connected from this pin to GND sets frequency shift at start-up to prevent excessive energy inrush soft-start. 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.

If the voltage on the pin is lower than the reference, the IC enters an idle state and its quiescent current is reduced. Bypass the pin with a capacitor to GND to reduce noise pick-up. The board provides datasbeet. A higher level OCP latches off the IC if the first-level protection is not sufficient to control the primary current.

L Datasheet(PDF) – STMicroelectronics

ESD immunity for pins 14, 15 and 16 is guaranteed up to V 4. In fact it incorporates thevariations. The input section is provided withL dqtasheet, a double ended primary controller for resonant half-bridge ZVS zero voltage switching.