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During UVLO, it is open. A current generator is ON as long as the voltage applied at the pin is below 1.

High-side gate-drive floating ground. The driver is capable of 0. This pin connects an external capacitor to GND and a resistor to RFmin pin 4 that set both the maximum oscillator frequency and the time constant for the frequency shift that occurs as the chip starts up soft-start. 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.

The chip restarts switching as the voltage exceeds the reference by 50 mV. Bypass the pin with a capacitor to GND to reduce noise pick-up. 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. Functions Pin functions Name Function Soft start. A voltage below 1. A higher level OCP latches off the IC if the first-level protection is not sufficient to control the primary current.

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 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. Try Findchips PRO for schematic diagram l Soft-start is not invoked.


Activating the zener causes the IC to shut down not latched. The pin senses the primary current though a sense resistor or a capacitive divider for lossless sensing. The IC enables the designer to darasheet the operating frequency range of the converter by means of an externally programmable oscillator.

Schematic diagram Schematic diagram Figure 1. ESD immunity for pins 14, 15 and 16 is guaranteed up to V 4. A is kept always on. Sometimes a small bypass capacitor 0. Supply Voltage of both the signal part of the IC and the low-side gate driver.

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.

To drive 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.

Pin settings Pin functions continued Name Datashset Minimum oscillator frequency setting. This pin, normally open, is intended for stopping the PFC controller, for protection purpose or during burst-mode operation. L Pin functions continued N.

L from STMicroelectronics

The information is latched and it is necessary to recycle the supply voltage of the IC to enable it to restart: If the current keeps on building up despite this frequency increase, a second comparator referenced at 1. The voltage on the pin is top-limited by an internal zener.

This patented structure replaces the normally used external diode. Layout carefully the connection of this pin to avoid too large spikes below ground. As the voltage on the pin exceeds 3. Leave the pin unconnected if not used. Every time the voltage on the ISEN pin exceeds 0. Current return for both the low-side gate-drive current and the bias current of the IC. A mA mA Iq Residual consumption ?


L6599 Datasheet PDF

The pin is not internally connected to isolate the high-voltage pin and ease compliance with safety regulations creepage distance on the PCB. Internally the pin connects a comparator that, when the voltage on the pin exceeds 1. As the voltage exceeds a 0.

Oscillator’s internal block diagram. The board provides one. This input is not intended for a cycle-by-cycle control; hence the voltage signal must be filtered to get average current information. 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 comparator is provided with current hysteresis: 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.

In this way, under short circuit conditions, the converter will work intermittently with very low input average power. Current return for the k6599 gate-drive current. An R-C series connected from this pin to GND sets frequency shift l659 start-up to prevent excessive energy inrush soft-start. L Auxiliary power supplyTracking boost operation n Voltage feed-forward n Inductor saturation detector n L The region on the left-hand side of the diagram in Figure 5, i.

A capacitor and a resistor are connected from l66599 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.

Bias the pin between 1. The value of this resistor will set the maximum operating frequency.