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參數(shù)資料
| 型號： | NCP1651DR2G |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 26/32頁 |
| 文件大小： | 779K |
| 描述： | IC PFC CONTROLLER CCM/DCM 16SOIC |
| 標準包裝： | 1 |
| 模式： | 連續(xù)導(dǎo)電（CCM），間歇導(dǎo)電（DCM） |
| 頻率 - 開關(guān)： | 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(yīng)商設(shè)備封裝： | 16-SOIC |
| 包裝： | 標準包裝 |
| 其它名稱： | NCP1651DR2GOSDKR |
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NCP1651
http://onsemi.com
26
Error Amplifier
The error amplifier resides on the secondary side of the
circuit, and therefore is not part of the chip. A minimal
solution would include either a discrete amplifier and
reference, or an integrated circuit that combines both, such
as the TL431 series of regulators.
Figure 41. Error Amplifier Circuit
--
+
FB/SD
Error
Amp
R
fb
C
fb
R
dc2
R
dc1
R
opto
V?/DIV>
V
out
V
ref2
This configuration for the error amplifier will result in a
low cost regulator, however, due to the slow loop response
of a PFC regulator it will not protect against overvoltage
conditions (e.g. load removal) or droop when a transient
load is added.
The primary side circuit has been designed such that the
PFCcontrollerwilloperateatmaximumdutycyclewiththe
optocouple in a non- -conducting state. This is necessary to
allow the unit to bring up the output when the system is
initially energized. At this time there is not output voltage
available to drive the LED in the optocoupler.
In the circuit of Figure 41, the amplifier and reference
needtoberatedatthemaximumvoltagethattheoutputwill
experience, including transient conditions. Resistors R
dc1
and R
dc2
need to be chosen such that the voltage at V?is
equal to V
ref2
when V
out
is at its regulated voltage. R
opto
is
acurrentlimitingresistorthatprotectstheoptocouplerfrom
current transients due to output surges.
This design also includes inherent compensation from
transients.Sincethebandwidthoftheerroramplifierisvery
low, its output can not respond rapidly to changes in the
outputvoltage.Atransientchangeintheoutputvoltagewill
change the current through R
opto
. Since the output of the
error amplifier does not change immediately, if the output
voltage increases, the voltage across R
opto
will increase.
This drives more current through the optocoupler, which in
turn reduces the output of the converter.
An alternate regulator is recommended, which is only
slightly more expensive, and offers excellent protection
from positive transients, and quick recovery from negative
transients.
Figure 42. Error Amp with Over/Undershoot
Protection
--
+
--
+
--
+
12 V
7.5 k
R
bias
0.01 mF
4.02 k
5.23 k
9.31 k
R
out
453
422
5.23 k
R
tn
Undervoltage
Capacitor
3.6 k
R
opto
C
out
Error Amplifier
MC3303
Overvoltage
Comparator
TL431
The configuration shown in Figure 42, incorporates an
error amplifier with slow loop response, plus overvoltage
andundervoltagecomparators.Undernormaloperationthe
outputs of the Undervoltage and Overvoltage Comparators
are high. The Undervoltage Comparator provides drive for
theoptocoupler,whiletheOvervoltageComparatorreverse
biases the diode on its output and is out of the loop.
Thiscircuitisdesignedwith8%trippointsbothaboveand
below the regulation limit. If an overvoltage condition
exists, the Overvoltage comparator will respond very
quickly.Whenitsoutputgoeslow,itwillprovidemaximum
drivetotheoptocoupler,whichwillshutofftheoutputofthe
converter.
Iftheoutputvoltagedrops8%ormorebelowitsregulated
level, the Undervoltage Comparator will go low. This will
removethedrivefromtheoptocoupler,whichwillallowthe
regulator to increase the duty cycle and return the output to
its regulation range much faster than the error amplifier
could.
Thisconfigurationwillworkoverarangeof5to30volts,
with the appropriate changes in R
out
, R
bias
and R
opto
.
R
out
(k? = (V
out
- - 4.753) / 0.7785
R
bias
(k? = (V
out
- - 4.4)
R
opto
(k? = (V
out
- - 3) / 2
The value for R
opto
will allow a maximum of 2 mA to
drivetheoptocoupler.Ifadditionalcurrentisneeded,change
the 2 in the denominator of that equation to the current
(in mA) that is desired.
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