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SG6741SY Datasheet(PDF) 9 Page - Fairchild Semiconductor

Part # SG6741SY
Description  Highly Integrated Green-Mode PWM Controller
Download  12 Pages
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

SG6741SY Datasheet(HTML) 9 Page - Fairchild Semiconductor

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© 2008 Fairchild Semiconductor Corporation
www.fairchildsemi.com
SG6741 • Rev. 1.3.3
9
Functional Description (Continued)
VDD Over-Voltage Protection (OVP)
VDD over-voltage protection has been built in to prevent
damage due to abnormal conditions. Once the VDD
voltage is over the VDD over-voltage protection voltage
(VDD-OVP), and lasts for tD-VDDOVP, the PWM pulses is
disabled until the VDD voltage drops below the UVLO,
then starts up again. Over-voltage conditions are
usually caused by open feedback loops.
Limited Power Control
The FB voltage increases every time the output of the
power supply is shorted or overloaded. If the FB voltage
remains higher than a built-in threshold for longer than
tD-OLP, PWM output is turned off. As PWM output is
turned off, the supply voltage VDD begins decreasing.
When VDD goes below the turn-off threshold (eg, 10.5V)
the controller totally shuts down. VDD is charged up to
the turn-on threshold voltage of 16V through the startup
resistor until PWM output is restarted. This protection is
activated as long as the overloading condition persists.
This prevents the power supply from overheating.
Noise Immunity
Noise on the current sense or control signal may cause
significant pulse width jitter, particularly in the
continuous-conduction mode. Slope compensation
helps alleviate this problem. Good placement and
layout practices should be followed. Avoiding long PCB
traces and component leads, locating compensation
and filter components near to the SG6741, and
increasing the power MO gate resistance improves
performance.


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