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In this way, under short circuit conditions, the converter will work intermittently with very low input average power.

Previous 1 2 If the voltage on the pin is lower than the reference, the IC enters an idle state and its quiescent current is reduced. Current return for both the low-side gate-drive current and the bias current of the IC. During UVLO, it is datzsheet.

schematic diagram l datasheet & applicatoin notes – Datasheet Archive

The IC dayasheet be forced to enter a controlled burst-mode operation at light load, so as to keep converter’s input consumption to a minimum. 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 not latched. As the voltage exceeds a 0.

This function realizes burst-mode operation when the load falls below datqsheet level that can be programmed by properly choosing the resistor connecting the optocoupler to pin RFmin see block diagram.

Current return for the high-side gate-drive current. 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.

ESD immunity for pins 14, 15 and 16 is guaranteed up to L6599 4. Tie the pin to GND if the function is not used.


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.

This input is not intended for a cycle-by-cycle control; hence the voltage signal must be filtered to get average current information. 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 switching frequency of the converter.

This patented structure replaces the normally used external diode. The IC will be soft-restarted as the voltage drops below 0. A is kept always on.

Functions Pin functions Name Function Soft start. In fact it incorporates thevariations.

High-voltage Resonant Controller

L Pin functions continued N. 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 IC enables the designer to set the operating frequency range of the converter by means of an externally programmable oscillator. 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. 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.

The value of this resistor will set the maximum operating frequency. Soft-start is not invoked.

Pin settings Pin functions continued Name Function Minimum oscillator frequency setting. Schematic diagram Schematic diagram Figure 1. High-side gate-drive floating ground. High-side gate-drive floating supply Voltage. The pin senses the primary current though a sense resistor or a capacitive divider for lossless sensing.

Try Findchips PRO for schematic diagram l A mA mA Iq Residual consumption ? Output voltage regulation is obtained by modulating the operating frequency.


Schematic diagram 5 of 9. Block Diagram and Schematic. Soft-start and delayed shutdown upon overcurrent timing diagram-Delay C Delay 0. The board provides one. Tie the pin to RFmin if burst-mode is not used. Oscillator’s internal block diagram Linformation L Figure The comparator is provided with current hysteresis: A current generator and is slowly discharged by the external resistor. Every time the voltage on the ISEN pin exceeds 0.

Block Diagram and Schematic – – This Document can not be used without Samsung’s authorization – 8. The driver is capable of 0. 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.

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. Oscillator’s internal block diagram.

The input section is provided withLa double ended primary controller for dztasheet half-bridge ZVS zero voltage switching. The information is latched and it is necessary to recycle the supply voltage of the IC to enable it to restart: This condition datasheef allowed for a maximum time set at pin 2. 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.

L Auxiliary power supplyTracking boost operation n Voltage feed-forward n Inductor saturation detector dwtasheet L