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Q0365R Datasheet(PDF) 12 Page - Fairchild Semiconductor

Part # Q0365R
Description  Green Mode Fairchild Power Switch (FPS) for Quasi-Resonant Operation - Low EMI and High Efficiency
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

Q0365R Datasheet(HTML) 12 Page - Fairchild Semiconductor

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© 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Rev. 1.0.0
12
4. Protection Circuits:
The FSQ-series has several
self-protective functions, such as Overload Protection
(OLP), Abnormal Over-Current protection (AOCP), Over-
Voltage Protection (OVP), and Thermal Shutdown
(TSD). All the protections are implemented as auto-
restart mode. Once the fault condition is detected,
switching is terminated and the SenseFET remains off.
This causes VCC to fall. When VCC falls down to the
Under-Voltage Lockout (UVLO) stop voltage of 8V, the
protection is reset and start-up circuit charges VCC
capacitor. When the VCC reaches the start voltage of
12V, the FSQ-series resumes normal operation. If the
fault condition is not removed, the SenseFET remains off
and VCC drops to stop voltage again. In this manner, the
auto-restart can alternately enable and disable the
switching of the power SenseFET until the fault condition
is eliminated. Because these protection circuits are fully
integrated into the IC without external components, the
reliability is improved without increasing cost.
Figure 23. Auto Restart Protection Waveforms
4.1 Overload Protection (OLP):
Overload is defined as
the load current exceeding its normal level due to an
unexpected abnormal event. In this situation, the
protection circuit should trigger to protect the SMPS.
However, even when the SMPS is in the normal
operation, the overload protection circuit can be
triggered during the load transition. To avoid this
undesired operation, the overload protection circuit is
designed to trigger only after a specified time to
determine whether it is a transient situation or a true
overload situation. Because of the pulse-by-pulse
current limit capability, the maximum peak current
through the Sense FET is limited, and therefore the
maximum input power is restricted with a given input
voltage. If the output consumes more than this maximum
power, the output voltage (VO) decreases below the set
voltage. This reduces the current through the opto-
coupler LED, which also reduces the opto-coupler
transistor current, thus increasing the feedback voltage
(VFB). If VFB exceeds 2.8V, D1 is blocked and the 5µA
current source starts to charge CB slowly up to VCC. In
this condition, VFB continues increasing until it reaches
6V, when the switching operation is terminated, as
shown in Figure 24. The delay time for shutdown is the
time required to charge CB from 2.8V to 6V with 5µA. A
20 ~ 50ms delay time is typical for most applications.
Figure 24. Overload Protection
4.2 Abnormal Over-Current Protection (AOCP):
When
the secondary rectifier diodes or the transformer pins are
shorted, a steep current with extremely high-di/dt can
flow through the SenseFET during the LEB time. Even
though the FSQ-series has OLP (Overload Protection), it
is not enough to protect the FSQ-series in that abnormal
case, since severe current stress is imposed on the
SenseFET until OLP triggers. The FSQ-series has an
internal AOCP (Abnormal Over-Current Protection)
circuit as shown in Figure 25. When the gate turn-on
signal is applied to the power SenseFET, the AOCP
block is enabled and monitors the current through the
sensing resistor. The voltage across the resistor is
compared with a preset AOCP level. If the sensing
resistor voltage is greater than the AOCP level, the set
signal is applied to the latch, resulting in the shutdown of
the SMPS.
Figure 25. Abnormal Over-Current Protection
Fault
situation
8V
12V
VCC
V
DS
t
Fault
occurs
Fault
removed
Normal
operation
Normal
operation
Power
on
FSQ0365RN Rev. 00
V
FB
t
2.8V
6.0V
Overload protection
t
12= CFB*(6.0-2.8)/Idelay
t1
t2
FSQ0365RN Rev.00
1
S
Q
Q
R
OSC
R
3R
GND
Gate
driver
LEB
200ns
PWM
V
OCP
AOCP
R
sense
FSQ0365RN Rev.00


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