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FAN6755 Folha de dados(PDF) 7 Page - Fairchild Semiconductor

Nome de Peças FAN6755
Descrição Electrónicos  Design Guideline to Replace FAN6753 with FAN6755
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Fabricante Electrônico  FAIRCHILD [Fairchild Semiconductor]
Página de início  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN6755 Folha de dados(HTML) 7 Page - Fairchild Semiconductor

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AN-6755
APPLICATION NOTE
© 2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.2 • 1/14/11
7
Overload / Open-Loop Protection (OLP)
When output is overloaded, the drain current reaches its
pulse-by-pulse current limit level, limiting the input power.
Then, the output voltage drops and no current flows
through the opto-diode, which causes the feedback voltage
to increase above the OLP protection threshold (4.6V). This
behavior is similar to when the feedback loop is open and
no current flows through the opto-diode.
When the feedback voltage is higher than 4.6V longer than
the OLP delay time, the OLP protection is triggered, as
shown in Figure 17.
VLimit
Sense pin
signal
Cycle by cycle current limit
VFB-OLP
VFB-OPEN
tOLP
FB pin
signal
Figure 17.
OLP Behavior
VDD Over-Voltage Protection (VDD_OVP)
VDD over-voltage protection protects the VDD pin from
damage by over-voltage. The VDD voltage rises when an
open-feedback loop failure occurs. Once the VDD voltage
exceeds 26V (VDD-OVP) for longer than 125µs, the
FAN6755 stops switching until VDD is discharged below
VDD-LH.
Over-Temperature Protection (OTP)
The FAN6755 has a built-in temperature sensing circuit to
disable PWM output if the junction temperature exceeds
135°C. While PWM output is disabled, the VDD voltage
gradually drops to the UVLO voltage (around 7.8V). Then
VDD is charged up to the startup threshold voltage of 16V
through the startup resistor until PWM output is restarted.
This “hiccup” mode protection continues as long as the
temperature remains above 135°C The temperature
hysteresis window for the OTP circuit is 25°C.


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