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The comparator is provided with current hysteresis: Supply Voltage of both datsaheet signal part of the IC and the low-side gate driver. 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. The pin senses some voltage related to the feedback control, which is compared to an internal reference 1.
L Datasheet pdf – High-voltage resonant controller – ST Microelectronics
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.
This pin, normally open, is intended for stopping the PFC controller, for protection purpose or during burst-mode operation.
Soft-start and delayed shutdown upon overcurrent timing diagram-Delay C Delay 0. Datashee voltage regulation is obtained by modulating the operating frequency.
LA datasheet, STMicroelectronics 3.
High-voltage Resonant Controller
Block Diagram and Schematic. Sometimes a small bypass capacitor 0. LApplication information L Figure Previous 1 2 The board provides one. 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 datasheet DMOS that replaces the external fast-recovery bootstrap diode.
Schematic diagram 5 of 9. L Auxiliary power supplyTracking boost operation n Voltage feed-forward n Inductor saturation detector n L The IC can be forced to datasheeg a controlled burst-mode operation at light load, so as to keep converter’s input consumption to a minimum. The voltage on the pin is top-limited by an internal zener. A capacitor and a resistor are connected from this pin to GND to set both the maximum duration of an overcurrent condition ddatasheet the IC stops switching and the delay after which the IC restarts datasneet.
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 ?
A mA mA Iq Residual consumption ? 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.
L6599 Datasheet PDF
The driver is capable of 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.
A current generator is ON as long as the voltage applied at the pin is below 1. This condition is allowed for a maximum time set at pin 2. The information is latched and it is necessary to recycle the supply voltage of the IC to enable it to restart: Every time the voltage on the ISEN pin exceeds 0.
High-side gate-drive floating ground. High-side gate-drive floating supply Datasyeet.
A higher level OCP latches off the IC if ll6599 first-level protection is not sufficient to control the primary current. TRF SWRA digital power factor meter circuit diagram digital frequency meter circuit diagram microphone mixer schematic circuit diagram digital frequency meter “power factor measurement” schematic PIC Microcontroller Digital panel meter diagram using microcontroller SR schematic diagram of audio device c siemens MHz.
Functions Pin functions Name Function Soft start. A is kept always on. This function realizes burst-mode operation dataeheet the load falls below a level that can be programmed by properly choosing the resistor connecting the optocoupler to pin RFmin see block diagram. High-side floating gate-drive output. 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.
Delayed shutdown upon overcurrent. Tie the pin to GND if the function is xatasheet used. Tie the pin to RFmin if burst-mode is not used. An R-C series ll6599 from this pin to GND sets frequency shift at start-up to prevent excessive energy inrush soft-start. The chip restarts switching as the voltage exceeds the reference by 50 mV.
Current return for the high-side gate-drive current. Layout carefully the connection of this pin to avoid too large spikes below ground. Schematic diagram Schematic diagram Figure 1. 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.