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High-side gate-drive floating supply Voltage. Every time the voltage on the ISEN pin exceeds 0. Under output short circuit, this normally results in a nearly constant peak primary current.

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. Activating the zener causes the IC to shut down datasheft latched.

L6599 Datasheet PDF

Leave the pin unconnected if not used. High-side floating gate-drive output. 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.

Dxtasheet return for both the low-side gate-drive current and the bias current of the IC.

L Datasheet pdf – High-voltage resonant controller – ST Microelectronics

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. If the voltage on the pin is lower than the reference, the IC enters an idle state and its quiescent current is datashet. In adtasheet way, under short circuit conditions, the converter will work intermittently with very low input average power.


A is kept always on. Supply Voltage of both the signal part of the IC and the low-side gate driver. The information is latched and it is necessary to recycle the supply voltage of the IC to enable it to restart: 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 region on the left-hand side of the diagram in Figure 5, i.

The IC enables the designer to set the operating frequency range of the converter by means of an externally programmable oscillator.

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. As the voltage exceeds a 0. A mA mA Iq Residual consumption ? 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.

Bias the pin between 1. ESD immunity for pins 14, 15 and 16 is guaranteed up to V 4. The pin senses some voltage related to the feedback control, which is compared to an internal reference 1. During UVLO, it is open.

Sometimes a small bypass capacitor 0.

Schematic diagram 5 of 9. 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. Output voltage regulation is obtained by modulating the operating frequency.

The Datssheet can be forced to enter a controlled burst-mode operation at light load, so as to keep converter’s input consumption to a minimum. Previous 1 2 This frequency shift is non linear to minimize datasheett voltage overshoots; its duration is programmable as well.


An R-C series connected from this pin to GND sets frequency shift at start-up to prevent excessive energy inrush 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. Bypass the pin with a capacitor to GND to reduce noise pick-up. The driver is capable of 0.

LApplication information L Figure In fact it incorporates thevariations. L Auxiliary power supplyTracking boost operation n Voltage feed-forward n Inductor datasheeet detector n L Tie the pin to GND if the function is not used.

L Datasheet(PDF) – STMicroelectronics

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Internally the pin connects a comparator that, when the voltage on the pin exceeds 1. The IC will be soft-restarted as the voltage drops below 0.

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 datasgeet frequency of the converter.

Soft-start and delayed shutdown upon overcurrent timing diagram-Delay C Delay 0. Try Findchips PRO for schematic diagram l