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SG5841J Datasheet(PDF) 11 Page - Fairchild Semiconductor

Part # SG5841J
Description  Highly Integrated Green-Mode PWM Controller
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

SG5841J Datasheet(HTML) 11 Page - Fairchild Semiconductor

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© 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
SG5841J • Rev. 1.3.3
11
Thermal Protection
An NTC thermistor RNTC in series with a resistor RA can
be connected from the RT pin to ground. A constant
current IRT is output from pin RT. The voltage on the RT
pin can be expressed as VRT = IRT × (RNTC + RA), in
which IRT = 2 x (1.3V / RI). At high ambient temperature,
RNTC is smaller, such that VRT decreases. When VRT is
less than 0.62V, the PWM is completely turned off.
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.
)
(K
I
R
115
.
1
(ms)
OLP
-
D
t
Ω
×
=
(2)
When VDD goes below the turn-off threshold (e.g. 10V)
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
remains activated as long as the overloading condition
persists. This prevents the power supply from
overheating due to overloading conditions.
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 SG5841/J, and increasing
power MOS gate resistance improve performance.


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