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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 datxsheet.

A mA mA Iq Residual consumption ? The pin is not internally connected to isolate the high-voltage pin and ease compliance with safety regulations creepage distance on the PCB.

Current return for the high-side gate-drive current. In this way, under short circuit conditions, the converter will work intermittently with very low input average power. If the current keeps on building up despite this frequency increase, a second comparator referenced at 1. A is kept always on. At start-up, to prevent uncontrolled inrush current, the switching frequency starts from a programmable maximum value and progressively decays until dafasheet reaches the steady-state value determined by the control loop.

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

Schematic diagram 5 of 9.

This frequency shift p6599 non linear to minimize output voltage overshoots; its duration is programmable as well. The driver is capable of 0. The IC will be soft-restarted as the voltage drops below 0. Internally the pin connects a comparator that, when the voltage on the pin exceeds 1. Delayed shutdown upon overcurrent.


Bias the pin between 1. This pin connects an external catasheet 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.

Under output short circuit, this normally results in a nearly constant peak primary current. Bypass the pin with a capacitor to GND to dattasheet noise pick-up. Datashfet value of this resistor will set the maximum operating frequency. 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.

Previous 1 2 This pin, normally open, is intended for stopping the PFC controller, for protection purpose or during burst-mode operation.

No abstract text available Text: 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. Pin settings Pin functions continued Name Function Minimum oscillator frequency setting.

Activating the zener causes the IC datashewt shut down not latched. Supply Voltage of both the signal part of the IC and the low-side gate driver. The input section is provided withLa double ended primary controller for resonant half-bridge ZVS zero voltage switching. The comparator is provided with current hysteresis: Soft-start and delayed shutdown upon overcurrent timing diagram-Delay C Delay 0.

L 데이터시트(PDF) – STMicroelectronics

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.

Every time the voltage on the ISEN pin exceeds 0. In fact it incorporates thevariations. A dataasheet generator and is slowly discharged by the external resistor. Layout carefully the connection of this pin to avoid too large spikes below ground.


High-voltage Resonant Controller

The chip restarts switching as the voltage exceeds the reference by 50 mV. 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 ?

Xatasheet combination offers complete protection against overload and short circuits.

Oscillator’s internal block diagram Linformation L Figure Current return for both the low-side gate-drive current and the bias current of the IC. LApplication l659 L Figure Leave the pin unconnected if not used.

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.

As the voltage on the pin exceeds 3. Soft-start is not invoked. The information is latched and it is necessary to recycle the supply voltage of the IC to enable it to restart: 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.

Output voltage regulation is obtained by modulating the operating frequency. An R-C series connected from this pin to GND sets frequency shift at start-up to prevent excessive energy inrush soft-start. During UVLO, it is datasehet. Tie the pin to RFmin if burst-mode is not used.