參數(shù)資料
型號(hào)： NCP1381
廠商： ON SEMICONDUCTOR
英文描述： Low−Standby High Performance PWM Controller
文件頁(yè)數(shù)： 14/26頁(yè)
文件大?。?/td> 559K
代理商： NCP1381
NCP1381
http://onsemi.com
14
Figure 16. Peak Current Evolution with Input
Voltage in a QR Converter at Constant Output
Power (100 W)
Figure 17. I
P
Evolution with Output Power
3.2
3.1
3.0
2.9
2.8
2.7
2.6
2.5200
250
300
350
400
V
in
, VOLTAGE (V)
P
O
0
20
40
60
80
100
4
3
2
1
0
I
P
I
P
Required I
Pmax
As a result, we will probably calculate our sense resistor
to let the converter bring the peak current up to 3.15 A at low
mains (200 VDC in followerboost configuration).
Unfortunately, in high mains conditions, where the PFC
delivers up to 400 VDC, the controller will also allow the
same 3.15 A maximum peak current (even a little more with
the propagation delay) and the power will dramatically
increase. In these conditions, the maximum power shall
absolutely be clamped in order to avoid lethal runaways in
presence of a fault. If overpower compensation via a resistor
to the bulk capacitor offers a possible way, it suffers from the
lack of precision and good repeatability in production. It also
degrades the standby consumption.
Since our controller integrates a brownout (BO)
protection that permanently senses the bulk capacitor, we
naturally have a voltage image of the bulk voltage. By
converting the BO level into a current, then routing this
current in the current sense (CS) pin, we can easily create a
variable offset that will compensate the maximum output
power. This would result in a variable I
Pmax
as exemplified
by the dashed line on Figure 16.
From the peak current definition, we can extract the output
power variation, with a fixed peak current (the maximum
peak the controller will authorize is 0.8 / R
sense
) and thus
quantify the difference between low and high line:
Pnc(Vin) :
0.8
RS
Vin
LP
tP
2
(
(Vin(Vout
VF)))
Vout
VF
Vin
N
(eq. 4)
where
t
P
is the propagation delay (100 ns typically).
If we enter our previous parameters into the
noncompensated output power definition and plot the result
versus the input voltage, then we obtain the following graph,
Figure 18:
Figure 18. Output Power Evolution with the Input
Voltage (No Compensation)
V
in
, VOLTAGE (V)
I
P
130
125
120
115
110
105
100
200
250
300
350
400
Figure 19. A Possible Way to Compensate the
Current Excursion Lies in Offsetting the
Current Floor
0.8 V
0.64 V
t
I
P
LL
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