參數(shù)資料
型號(hào)： FSD1000
廠商： FAIRCHILD SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： Combo Fairchild Power Switch (FPS)
中文描述： 1.2 A SWITCHING REGULATOR, 73 kHz SWITCHING FREQ-MAX, PDIP12
封裝： HEAT SINK/SLUG, DIP-12
文件頁(yè)數(shù)： 10/20頁(yè)
文件大?。?/td> 375K
代理商： FSD1000
FSD1000
10
line under voltage lockout, FSD1000 enters into auto restart
operation. Once the fault condition occurs, switching is
terminated and the SenseFET remains off. This causes Vcc
to fall. When Vcc reaches the stop voltage (9.5V), the
internal startup circuit charges Vcc capacitor up to start
voltage (13.5V). When Vcc reaches 13.5V, the internal
startup circuit is disabled and Vcc is discharged down to
9.5V. In this manner, FSD1000 repeats charging and
discharging Vcc capacitor 4 times. After then, the protection
is reset and the FSD1000 resumes its normal operation. In
this manner, the auto-restart can alternately enable and
disable the switching of the power SenseFET until the fault
condition is eliminated as shown Figure 7. Meanwhile,
FSD1000 enters into latch mode in the case of Vcc OVP,
Line OVP and Main OLP and OTP. The fault latch is reset
only when Vcc is fully discharged below 6V by un-plugging
the AC line as shown in Figure 8.
Figure 7. Auto restart mode protection
Figure 8. Latch mode protection
3.1 Over Load Protection :
Over load means that the load
current exceeds a pre-set level due to an abnormal situation.
In this situation, protection circuit should be triggered in
order to protect the SMPS. Because of the pulse-by-pulse
current limit capability, the maximum peak current through
the SMPS is limited, and therefore the maximum input
power is restricted with a given input voltage. If the output
consumes beyond this maximum power, the output voltage
(Vo) decreases below the set voltage. This reduces opto-
coupler transistor current increasing feedback voltage (Vfb).
If the inverting input of PWM comparator reaches its
maximum value, D1 is blocked and the current source I
delay
starts to charge C
FB
slowly compared to when the current
source I
FB
charges C
FB
. In this condition, the feedback
voltage continues increasing until it reaches OLP threshold,
and the switching operation is terminated at that time. The
OLP for the auxiliary power is auto restart mode while OLP
for the main is latch mode.
3.2 Line Under voltage lockout :
The switching operation
for the main power is terminated when the voltage of LS1
drops below 1.4V and the switching operation for auxiliary
power is terminated when this voltage goes below 0.8V.
3.3 Over voltage protection :
In an abnormal situation such
as feedback loop open, the supply voltage for FSD1000
(Vcc) may rise above the breakdown voltage of the FPS. In
order to protects the FPS from the over voltage damage,
FSD1000 employs over voltage protection for Vcc. If Vcc
exceeds 21V, OVP circuit is triggered resulting in a
termination of switching operation of both main and
auxiliary powers. In order to avoid undesired triggering of
OVP during normal operation, Vcc should be properly
designed to be below 21V.
3.4 Line Over voltage protection :
When the voltage of
LS2 rises above below 4.4V, the switching operations for the
main and auxiliary powers are disabled to protect the
switching devices.
3.5 Over Temperature Protection :
The thermal shutdown
circuitry senses the junction temperature. The threshold is set
at 160
°
C.
When the junction temperature rises above this
threshold, the switching operations of main and auxiliary
powers are disabled.
4. Burst Mode Operation :
In order to minimize the power
dissipation in the standby mode, FDS1000 has burst
operation for the auxiliary power. The FPS enters into the
burst mode when the feedback voltage decreases as the load
decreases. The operation principle of the burst mode is
illustrated in Figure 9. When the feedback voltage drops
below 0.5V, the FPS stops the switching operation. Then, the
output voltage decreases below the set voltage, which
increases the feedback voltage. When the feedback voltage
rises above 0.7V, the FPS resumes the switching operation
and the feedback voltage decreases. When the feedback
voltage drops below 0.5V again, the FPS ceases the
Vcc
13.5V
9.5V
Over Load of Aux
Restart
Aux V
ds
Over Load removed
Vcc
13.5V
9.5V
OTP, Vcc OVP, Line
OVP, Main OLP
Aux V
ds
AC power Off
6V
Latch Reset
AC power On
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