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NCP1910
V M +
R M I CS V LBO 2
4 V CTRL * V CTRL min
PFC Duty
V M
11
I M
R M
C M
Modulation
Figure 45. The Multiplier Voltage Pin Configuration
The multiplier voltage V M is generated according to
Equation 8.
?
V CTRL is the control voltage signal, the output
voltage of Operational Trans ? conductance Amplifier
R M I CS V LBO
2
V M + (eq. 8)
4 V CTRL * V CTRL(min)
Where:
? R M is the external multiplier resistor connected to
V M pin, which is constant.
? V LBO is the input voltage signal appearing on the
LBO pin, which is proportional to the rms input
voltage,
? I CS is the sense current proportional to the inductor
current I L as described in Equation 13.
Line Brown ? Out Protection
V in
Ac line
(OTA), as described in Equation 17.
? V CTRL(min) is not only the minimum operating
voltage of V CTRL but also the offset voltage for the
PFC current modulation.
R M directly limits the maximum input power capability.
Also, due to the V in2 feed ? forward feature, where the V LBO
is squared, the transfer function and the power delivery is
independent from the ac line level. The relationship between
V CTRL and power delivery will be depicted later on.
EMI
Filter
C in
R LBOU
LBO
V LBOT
LBO comp.
V LBOcomp
PFC_BO
R SENSE
C LBO
R LBOL
S
L BO Q
t LBO(blank)
t LBO(window)
Vdd
V LBO(clamp)
R
reset
reset
reset
I LBOH
Figure 46. The Line Brown ? Out Configuration
As shown in Figure 46, the Line Brown ? Out pin
(represented LBO pin) as receives a portion of the input
voltage (V in ). As V in is a rectified sinusoid, a capacitor must
integrate the ac line ripple so that a voltage proportional to
the average value of V in is applied to the brown ? out pin.
The main function of the LBO block is to detect too low
input voltage conditions. A 7 m A current source lowers the
LBO pin voltage when a brown ? out condition is detected.
This is for hysteresis purpose as required by this function.
In nominal operation, the voltage applied to LBO pin must
be above the internal reference voltage, V LBOT (1 V
typically). In this case, the output of the LBO comparator
V LBOcomp is low.
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