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The board provides one. Delayed shutdown upon overcurrent. In this way, under short circuit conditions, the converter will work intermittently with very low input average power. As the voltage exceeds a 0. 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.

The IC enables the designer to set the operating frequency range of the converter by means of an externally programmable oscillator. Leave the pin unconnected if not used. This condition is allowed for a maximum time set at pin 2. The pin is not internally connected to isolate the high-voltage pin and ease compliance with safety regulations creepage datasheeg on the PCB. The pin is to be connected to the high-voltage input bus with a resistor divider to perform either AC or DC dqtasheet systems with PFC brownout protection.

L6599 Datasheet PDF

LA datasheet, STMicroelectronics 3. Soft-start and delayed shutdown upon overcurrent timing diagram-Delay C Delay 0. LApplication datawheet L Figure 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. Oscillator’s internal block diagram. ESD immunity for pins 14, 15 and 16 is guaranteed up to V 4. An R-C series connected from this pin to GND sets frequency shift at start-up to prevent excessive energy inrush soft-start.


Activating the zener causes the IC to shut down not latched. 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 voltage on the pin is top-limited by an internal zener. Under output short circuit, this normally results in a nearly constant peak primary current.

The chip restarts switching as the voltage exceeds the reference by 50 mV. If the current keeps on building up despite this frequency increase, a second comparator referenced at 1.

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

Supply Voltage of both the signal part of the IC and the low-side gate driver. Every time the voltage on the ISEN pin exceeds 0. Tie the pin to K6599 if the function is not used. Tie the pin to RFmin if burst-mode is not used. The comparator is provided with current hysteresis: An interface with the PFC controller is provided that enables to switch off the pre-regulator during fault conditions, datxsheet as OCP shutdown and DIS high, or during burst-mode operation.

(PDF) L6599 Datasheet download

A voltage below 1. Block Diagram and Schematic – – This Document can not be used without Samsung’s authorization – 8. 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 ?

This pin, normally open, l599 intended for stopping the PFC datashheet, for protection purpose or during burst-mode operation. High-side gate-drive floating supply Voltage. A is kept always on.

Block Diagram and Schematic. Output voltage regulation is obtained by modulating the operating frequency. 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.


The information is latched and it is necessary to recycle the supply voltage of the IC to enable it to restart: The IC will be soft-restarted as the voltage drops below 0. A fixed deadtime inserted between the turn-OFF of one switch and the turn-ON datashret 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. The pin senses the primary current though a sense resistor or a capacitive divider for lossless sensing.

This 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.

Oscillator’s internal block diagram Linformation L Figure A current generator is ON as long as the voltage applied at the pin is below 1. Dataheet diagram Schematic diagram Figure 1.

A higher level OCP latches off the IC if the first-level protection is not sufficient to control the primary current. Schematic diagram 5 of 9. Pin settings Pin functions continued Name Function Minimum oscillator frequency setting. High-side gate-drive floating ground. Their combination offers complete protection against overload and short circuits.