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5. Current Sensing
Current Sensing Using Resistor: FSFR2100 senses
drain current as a negative voltage, as shown in Figure
24 and Figure 25. Half-wave sensing allows low power
dissipation in the sensing resistor, while full-wave
sensing has less switching noise in the sensing signal.
Cr
Np
Ns
Ns
Control
IC
V CS
CS
R sense
SG
PG
Ids
I ds
V CS
Figure 24. Half-Wave Sensing
I ds
V sense pk
V Cr p ? p
?
C B
C sense ? C B
V sense pk
2
? V CON
V CS
T delay ? R d C d
Cr
V CS
CS
Control
IC
SG
PG
R sense
Np
Ns
Ns
Figure 26. Current Sensing Using Resonant
Capacitor Voltage
6. Protection Circuits
The FSFR2100 has several self-protective functions,
capacitor voltage (V cr ) is proportional to the resonant
Ids
Figure 25. Full-Wave Sensing
Current Sensing Using Resonant Capacitor Voltage:
For high-power applications, current sensing using a
resistor may not be available due to the severe power
dissipation in the resistor. In that case, indirect current
sensing using the resonant capacitor voltage can be a
good alternative because the amplitude of the resonant
p-p
current in the primary side (I pp-p ) as:
such as Overload Protection (OLP), Over-Current
Protection (OCP), Abnormal Over-Current Protection
(AOCP), Over-Voltage Protection (OVP), and Thermal
Shutdown (TSD). OLP, OCP, and OVP are auto-restart
mode protections; while AOCP and TSD are latch-mode
protections, as shown in Figure 27.
6.1 Auto-restart Mode Protection: Once a fault
condition is detected, switching is terminated and the
MOSFETs remain off. When LV CC falls to the LV CC stop
voltage of 11.3 V, the protection is reset. The FPS
resumes normal operation when LV CC reaches the start
voltage of 14.5 V.
V Cr p ? p ?
I p p ? p
2 ? f s C r
(6)
To minimize power dissipation, a capacitive voltage
divider is generally used for capacitor voltage sensing, as
shown in Figure 26.
? 2010 Fairchild Semiconductor Corporation
FSFR2100 ? Rev.1.1.0
11
www.fairchildsemi.com
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