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| 型号： | NCP1382DR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 14/25页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM OVP OTP 14SOIC |
| 标准包装： | 2,500 |
| 输出隔离： | 隔离 |
| 频率范围： | 调节 |
| 输入电压： | 9 V ~ 20 V |
| 工作温度： | 0°C ~ 125°C |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SOICN |
| 包装： | 带卷 (TR) |
NCP1381, NCP1382
3.2
3.1
3.0
4
3
2.9
2.8
2.7
2.6
Required I Pmax
2
1
2.5
200
250
300
350
400
0
0
20
40
60
80
100
? ? Vout + VF + in ?
Pnc(Vin) : = V (eq. 4)
V in , VOLTAGE (V)
Figure 16. Peak Current Evolution with Input
Voltage in a QR Converter at Constant Output
Power (100 W)
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 follower--boost 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 brown--out (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
P O
Figure 17. I P Evolution with Output Power
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:
R S L P
? 0.8 + V in ? tP ?
2
( η ? (Vin ? (Vout + VF))) N
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:
130
125
120
I P
LL
0.8 V
0.64 V
115
110
105
100
200
250
300
350
400
t
V in , VOLTAGE (V)
Figure 18. Output Power Evolution with the Input
Voltage (No Compensation)
Figure 19. A Possible Way to Compensate the
Current Excursion Lies in Offsetting the
Current Floor
http://onsemi.com
14
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