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Fully compatible with the standard version, it has a superior performant multiplier making the device capable of working in wide input voltage range applications from 85V to V with an excellent THD. Furthermore the start up current has been reduced at few tens of? A and a disable function has been implemented on the ZCD pin, guaranteeing lower current consumption in stand by mode.

A resistive divider is connected between the output regulated voltage and this point, to provide voltage feedback. Output of error amplifier. A feedback compensation network is placed between this pin and the INV pin. Input of the multiplier stage. A resistive divider connects to this pin the rectified mains. A voltage signal, proportional to the rectified mains, appears on this pin.

Input to the comparator of the control loop. The current is sensed by a resistor and the resulting voltage is applied to this pin. Zero current detection input. If it is connected to GND, the device is disabled. Current return for driver and control circuits. Gate driver output. Supply voltage of driver and control circuits.

A mA mA mV? This is set by the ratio of the two external resistors R1 and R2 see fig. IR1 R1 Since the current through R2 does not change,? IR1 must flow through the capacitor C comp and enter the error amplifier.

This current is monitored inside the L and when reaches about 37? A the output voltage of the multiplier is forced to decrease, thus reducing the energy drawn from the mains. If the current exceeds 40? A, the OVP protection is triggered Dynamic OVP , and the external power transistor is switched off until the current falls approximately below 10? However, if the overvoltage persists, an internal comparator Static OVP confirms the OVP condition keeping the external power switch turned off see fig.

Finally, the overvoltage that triggers the OVP function is:? Typical values for R1, R2 and C are shown in the application circuits. The overvoltage can be set independently from the average output voltage. By grounding the ZCD voltage the device is disabled reducing the supply current consumption at 1. Releasing the ZCD pin the internal start-up timer will restart the device.

Overvoltage Protection Circuit Ccomp. F 25V C7 10nF 6 C5 47? Board and Components Layout of the Figg. OVP Current Threshold vs. Undervoltage Lockout Threshold vs. Supply Current vs. Voltage Feedback Input Threshold vs. Output Saturation Voltage vs. Mold flash or potrusions shall not exceed 0. Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use.

No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.

STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.


L6561 STMicroelectronics, L6561 Datasheet






LBN 002-01 PDF


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