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L Datasheet pdf – High-voltage resonant controller – ST Microelectronics
Soft-start is not invoked. Schematic diagram 5 of 9. Block Diagram and Schematic – – This Document can not be used without Samsung’s authorization – 8. The IC will be soft-restarted as the voltage drops below 0.
High-voltage Resonant Controller
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. Output voltage regulation is obtained by modulating the operating frequency.
In this way, under short circuit conditions, the converter will work intermittently with very low input average power. 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.
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.
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 ? Oscillator’s internal block diagram.
(PDF) L6599 Datasheet download
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. An R-C series connected from this pin to GND sets frequency shift at start-up to prevent excessive energy inrush soft-start.
The region on the left-hand side of the diagram in Figure 5, i. This input is not intended for a cycle-by-cycle control; hence the voltage signal must be filtered to get average current information. A current generator and is slowly discharged by the external dataheet.
Tie the pin to GND if the function is not used. Activating the zener causes the IC to shut down not latched. 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 datsaheet.
L from STMicroelectronics
Bias the pin between 1. No abstract text available Text: In fact it incorporates thevariations. Try Findchips PRO for schematic diagram l LA datasheet, STMicroelectronics 3.
High-side gate-drive floating supply Voltage. L Auxiliary power supplyTracking boost operation n Voltage feed-forward n Inductor saturation detector n L As the voltage on the pin exceeds 3.
Leave the pin unconnected if not used. Pin settings Pin functions continued Name Function Minimum oscillator frequency setting. Sometimes a small bypass capacitor 0. 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. Oscillator’s internal dahasheet diagram Linformation L Figure This pin, normally open, is intended for stopping the PFC controller, for protection purpose or during burst-mode operation.