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SB3100 Datasheet(PDF) 7 Page - Fairchild Semiconductor

No. de pieza SB3100
Descripción Electrónicos  Power Switch (FPSTM) FSBH-series to Standby Auxiliary Power Supply
Download  10 Pages
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Fabricante Electrónico  FAIRCHILD [Fairchild Semiconductor]
Página de inicio  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

SB3100 Datasheet(HTML) 7 Page - Fairchild Semiconductor

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AN-8024
APPLICATION NOTE
© 2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.1 • 9/18/09
7
changing the system transfer functions as the load current
decreases and/or input voltage increases.
One simple and practical way to address this problem is
designing the feedback loop for low input voltage and full
load condition with enough phase and gain margin. When
the converter operates in CCM, the RHP zero is lowest in
low input voltage and full load condition. The gain increases
only about 6dB as the operating condition is changed from
the lowest input voltage to the highest input voltage
condition under universal input condition. When the
operating mode changes from CCM to DCM, the RHP zero
disappears, making the system stable. Therefore, by
designing the feedback loop with more than 45 degrees
phase margin in low input voltage and full load condition,
the stability over all the operating ranges can be guaranteed.
Figure 9 is a typical feedback circuit mainly consisting of a
shunt regulator and a photo-coupler. R1 and R2 form a
voltage divider for output voltage regulation. RF and CF are
adjusted for control-loop compensation. The maximum
source current of the FB pin is about 1mA. The
phototransistor must be capable of sinking this current to
pull the FB level down at no load. The value of RD, is
determined as:
−−
⋅>
OOPD
KA
FB
D
VV
V
CTR I
R
(22)
where VOPD is the drop voltage of the photodiode, about 1.2V;
VKA is the minimum cathode to anode voltage of KA431 (2.5V);
and CTR is the current transfer rate of the opto-coupler.
Figure 9. Feedback Circuit
The feedback compensation network transfer function of
Figure 9 is obtained as:
ˆ
1/
ˆ
1/
ZC
FB
I
oPC
s
v
vs
s
ω
ω
ω
+
=−
+
(23)
where
1
ω =
FB
I
D
F
R
R RC
,
1
1
()
ZC
F
F
R
RC
ω =
+
, and
1
ω =
PC
FBFB
R C
.
and RFB is the equivalent feedback bias resistor of FSBH-
series (5k
Ω); and R1, RD, RF, CF and CFB are shown in Figure
10.
(Design Example)
Assuming CTR is 100%,
3
33
110
51.2
2.5
1.3
110
1 10
−−
⋅> ×
−−
−−
<
==
Ω
×
×
OOPD
KA
D
OOPD
KA
D
VV
V
CTR
R
VV
V
R
k
The minimum cathode current for KA431 is 1mA.
3
1.2
110
<
×
OPD
BIAS
V
R
k
1k
Ω resistor is selected for RBIAS.
The voltage divider resistors R1 and R2 for VO sensing
are selected as 20k
Ω and 20kΩ.
[STEP-11] Design Input Voltage Sensing Circuit
Figure 10 shows a resistive voltage divider with low-pass
filter for line-voltage detection of the VIN pin. The VIN
voltage is used for brownout protection, which triggers when
the VIN voltage drops below 0.6V. A 500ms debounce time
is introduced for brownout protection to prevent false
triggering by the voltage ripple on the input capacitor.
FSBH-series devices start up when the VIN voltage reaches
1.1V. It is typical to use 100:1 voltage divider for VIN level.
Figure 10.Input Voltage Sensing


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