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參數資料
| 型號： | NCP1651DR2G |
| 廠商： | ON Semiconductor |
| 文件頁數： | 25/32頁 |
| 文件大?。?/td> | 779K |
| 描述： | IC PFC CONTROLLER CCM/DCM 16SOIC |
| 標準包裝： | 1 |
| 模式： | 連續導電（CCM），間歇導電（DCM） |
| 頻率 - 開關： | 25kHz ~ 250kHz |
| 電流 - 啟動： | 8.5mA |
| 電源電壓： | 10 V ~ 18 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 16-SOIC |
| 包裝： | 標準包裝 |
| 其它名稱： | NCP1651DR2GOSDKR |
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NCP1651
http://onsemi.com
25
Basic Specifications
Thedesignofanypowerconverterbeginswithabasicset
of specifications. The following parameters should be
known before you begin:
Po
max
(Maximum rated output power)
Vrms
min
(Minimum operational line voltage)
Vrms
max
(Maximum operational line voltage)
f
switch
(Nominal switching frequency)
V
out
(Nominal regulated output voltage)
Most of these parameters will be dictated by system
requirements.
Transformer
For an average current mode, fixed frequency PFC
converter, there is no magic formula to determine the
optimum value of the transformers primary inductance.
There are several trade- -offs that should be considered.
These include peak current vs. average current, switching
losses vs. core losses and range of duty cycles over the
operational line and load range. All of these are a function
of inductance, line and load. These parameters determine
when the converter is operating in the continuous
conduction mode and when it is operating in the
discontinuous conduction mode.
If you are designing your own transformer, the
ON Semiconductor spreadsheet (NCP1651_Design.xls)
that is available as a design aid for this part can be of help.
Enter various values of inductance as well asthe turnsratio
and observe the variation in duty cycle and peak current vs.
average current.
The transformers duty cycle is an important parameter.
There are two main limitations for the duty cycle. The first
is the output voltage reflected back to the primary, which is
scaled by the turns ratio. This means that with a 10:1
(pri:sec) turns ratio, and a 12 volt output, the power switch
willseetheinputvoltage plus120 volts(10 x12 volts) plus
leakageinductancespike.Thisreflectedvoltagedetermines
the maximum voltage rating of the power switch.
The second, there are practical limits to the turns ratio.
Given the flyback converter transfer function, continuous
conduction mode,
V
O
= V
in
n (D1 D)
Itisevidentthatthereisadirectrelationshipbetweenduty
cycle and the turns ratio. In general, 10:1 is about the
maximum,althoughsome transformer manufacturersgoas
highas12:1oreven15:1.Turnsratiosof20:1andaboveare
not normally practical as they result in very high values of
leakageinductance,whichcreateslargespikesonthepower
switch. They also have a very large reflectovoltage
associated with them.
Theotheroptionistocontactatransformermanufacturer
such as Coiltronics (www.cooperet.com/
) or Coilcraft
(www.coilcraft.com/
). These companies will design and
manufacture transformers to your requirements.
Using the available spreadsheet, with the following
parameters,aprimaryinductanceof330mHandaturnsratio
of 10:1 would be a good choice.
Limits
Po
max
= 100 W
Vin
max
= 265 V
rms
Vin
min
= 85 V
rms
V
O
= 12 V
L
P
= 330 mH
f
switch
= 100 kHz
N
p
/N
s
= 10
Figure 39. Switching Current versus Phase Angle
PHASE ANGLE (?
0
45
90
135
180
6
5
4
3
2
1
0
PEAK CURRENT
PEDESTAL
CURRENT
Figure 40. Continuous/Discontinuous and Duty Cycle
DEGREES (?
0
45
90
135
180
100
75
50
25
0
100% = Discontinuous
50% = Continuous
DUTY CYCLE
MODE
Ifanauxiliarywindingisdesiredtoprovideabiassupply,
it should provide a minimum of 12.1 volts (to exceed the
UVLO spec) and a maximum of 18 volts. The auxiliary
windingshouldbeconnectedsuchthatitconductswhenthe
power switch is off. Near the zero crossings of the line
frequency, the voltage will have a peak voltage equal to the
regulatedoutputvoltagedividedbytheturnsratio.Thefilter
cap on the V
CC
pin needs to be of sufficient size to hold the
voltage up over between the zero crossings.
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