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Activating the zener causes the IC to shut down not latched.

L6599 Datasheet PDF

The voltage on the pin is top-limited by an internal zener. 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. 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.

In fact it incorporates thevariations. Current return for both the low-side gate-drive current and the dataasheet current of the IC. 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.



Output voltage regulation is obtained by modulating the operating frequency. A is kept always on. Tie the pin to GND if the function is not used. 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 low-side gate-drive. The value of this resistor will set the maximum operating frequency.

L Datasheet(PDF) – STMicroelectronics

Tie the pin to RFmin if burst-mode is not used. The region on the left-hand side of the diagram in Figure 5, i. ESD immunity for pins 14, 15 and 16 is guaranteed up to V 4. This condition is allowed for a maximum time set at pin 2. Bias the pin between 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 ? The comparator is provided with current hysteresis: This pin, normally open, is intended for stopping the PFC controller, for protection purpose or during burst-mode operation.


A current generator and is slowly discharged by the external resistor. This input is not intended for a cycle-by-cycle control; hence the voltage signal must be filtered to get average current information.

In this way, under short circuit conditions, the converter will work intermittently with very low input average power. Soft-start and delayed shutdown upon overcurrent timing diagram-Delay C Delay 0. Dtasheet IC will be soft-restarted as the voltage drops below 0.

High-voltage Resonant Controller

Soft-start is not invoked. A higher level OCP latches off the IC if the first-level protection is not sufficient to control the primary current. 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 datxsheet determined by the control loop.

Schematic diagram 5 of 9. If the voltage on the pin is lower than the reference, the IC enters an idle state and its quiescent current is reduced. Try Findchips PRO for schematic diagram l As the voltage on the pin exceeds 3. Leave the pin unconnected if not used.

The driver is capable of 0.