HVLED807PFTR datasheet(18/36 Pages) STMICROELECTRONICS

Teilenummer	HVLED807PFTR

Bauteilbeschribung	Offline LED driver with primary-sensing and high power factor up to 7 W

PDF	36 Pages

Scroll/Zoom	100%

Hersteller	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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18 / 36 page

Device description

HVLED807PF

18/36

Doc ID 023464 Rev 5

Figure 13.

Timing diagram: normal power-up and power-down sequences

4.4

Secondary side demagnetization detection and triggering

block

The demagnetization detection (DMG) and triggering blocks switch on the power MOSFET if

a negative-going edge falling below 50 mV is applied to the DMG pin. To do so, the

triggering block must be previously armed by a positive-going edge exceeding 100 mV.

This feature is used to detect transformer demagnetization for QR operation, where the

signal for the DMG input is obtained from the transformer's auxiliary winding used also to

supply the IC.

Figure 14.

DMG block, triggering block

AM13563v1

VCC

DRAIN

VccON

Vccrestart

VIN

VStart

5.5 mA

Power-on

Power-off

Normal operation

CV mode

CC mode

Normal operation

CHARGE

AM13564v1

DMG

60mV

110mV

BLANKING

TIME

TURN-ON

LOGIC

STARTER

LEB

Rf b

Aux

Rdmg

DMG

CLAMP

To Driv er

From CC/CV Block

From OCP

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