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MB39C602 Datasheet(Fiches technique) 12 Page - Cypress Semiconductor

Numéro de pièce MB39C602
Description  High Power Factor LED Driver IC for LED Lighting
Télécharger  40 Pages
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Fabricant  CYPRESS [Cypress Semiconductor]
Site Internet  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

MB39C602 Datasheet(HTML) 12 Page - Cypress Semiconductor

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Document Number: 002-08397 Rev. *A
Page 12 of 40
MB39C602
4. Power-Up Sequencing
When the voltage is input to VBULK, the electric charge is charged to capacitance of the VCG pin (CVCG) through starting
resistor (Rst). So, the voltage of the VCG pin rises. The voltage of the DRN pin rises by source follower when the voltage of the
VCG pin reaches the threshold voltage of the external HVMOSFET.
The DRN pin is connected with the VDD pin through the internal VDD Switch, and VDD capacitor (CVDD) is charged from the
DRN pin. When the voltage at the VDD pin reaches the threshold voltage of UVLO, the VDD Switch is turned off, and the
internal Bias circuit operates, and the switching is started.
After the switching begins, the voltage at the VDD pin is supplied from Auxiliary Winding through the external diode (DBIAS).
The voltage of an Auxiliary Winding is decided by rolling number ratio of Auxiliary Winding and Secondary Winding, and the
voltage of Secondary Winding. Therefore, the voltage at the VDD pin is not supplied, until the voltage of Auxiliary Winding rises
more than the voltage at the VDD pin. In this period, it is necessary to set the capacitor of the VDD pin to prevent the voltage of
the VDD pin from falling below the threshold voltage of UVLO.
The external Schottky diode (D1) is required between the DRN pin and VDD pin. This diode is used to prevent the current that
flows through the body diode of the VDD Switch.
Current Passing When Starting
10V/8V
VCG
Shunt
Enable
PWM
14V
2V
UVLO
DRN
6
VCG
5
Fault
8
VDD
VDD
Switch
HS
Drive
Driver
GND
7
PWM
Control
D1
DBIAS
CVDD
Rst
CVCG
VBULK
VDD Start-up Current
VDD Operating and LPM Current
HV-MOSFET
Primary
Winding
Auxiliary
Winding
Ist


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