HVLED001A datasheet(23/30 Pages) STMICROELECTRONICS

Il numero della parte	HVLED001A

Spiegazioni elettronici	Offline controller for LED lighting with constant voltage primarysensing and high power factor

PDF	30 Pages

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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DocID029000 Rev 2

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HVLED001A

Application information

7.2.6

Gate driver

The output stage, connected to VCC potential and capable of the 300 mA source and

600 mA sink current, is suitable to drive high current MOSFETs. The resulting managed

power can be greater than 150 W.

7.3

IC supply management

The IC's voltage supply is managed by the UVLO circuitry together with the high voltage

startup unit and reference generators. These logics define also supply currents during

different operating conditions.

7.3.1

VCC supply management

The IC is designed to operate with a range of supply voltage to ensure optimum gate

driving. An active limiting device is embedded to prevent low energy fluctuations to bring the

VCC voltage above the technological constraints.

Both the active mode and the low consumption mode exhibit very low supply currents in

order to meet the energy saving regulation.

The VCC pin can be driven independently from the HVSU pin's connection, for example

when auxiliary supply voltage is present. In this case the HVSU pin will be used solely to

monitor input voltage.

A bulk capacitor, having a capacitance of around 10 µF, followed by a ceramic capacitor,

having a typical capacitance of 100 nF and connected very tight to the VCC pin, are

necessary to properly sustain the VCC voltage during all operating phases.

HVLED001A Scheda tecnica(PDF) 23 Page - STMicroelectronics