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HVLED807PFTR Datasheet(PDF) 18 Page - STMicroelectronics

Part # HVLED807PFTR
Description  Offline LED driver with primary-sensing and high power factor up to 7 W
PDF  36 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

HVLED807PFTR Datasheet(HTML) 18 Page - STMicroelectronics

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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
t
t
VIN
VStart
5.5 mA
t
t
Power-on
Power-off
Normal operation
CV mode
CC mode
Normal operation
I
CHARGE
AM13564v1
DMG
60mV
110mV
BLANKING
TIME
TURN-ON
LOGIC
STARTER
S
R
Q
LEB
Rf b
Aux
Rdmg
DMG
CLAMP
To Driv er
From CC/CV Block
From OCP



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