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| 型號： | NCP1605DR2G |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 24/32頁 |
| 文件大?。?/td> | 745K |
| 描述： | IC PFC CONTROLLER CCM/DCM 16SOIC |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | Soft-Skip™ |
| 模式： | 臨界傳導(dǎo)（CRM），間歇導(dǎo)電（DCM） |
| 頻率 - 開關(guān)： | 250kHz |
| 電流 - 啟動： | 12mA |
| 電源電壓： | 10 V ~ 20 V |
| 工作溫度： | 0°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(biāo)準(zhǔn)包裝 |
| 其它名稱： | NCP1605DR2GOSDKR |
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NCP1605, NCP1605A, NCP1605B
http://onsemi.com
24
And pfcOK/REF5V is high when the PFC output
voltage is properly and safely regulated. pfcOK/REF5V
should be used to allow operation of the downstream
converter.
Standby Management
The NCP1605 automatically skips switching cycles when
the power demand drops below a given level. This is
accomplished by monitoring the Pin 1 voltage that must
receive a voltage below 300 mV in light load conditions.
Practically, a portion of the feedback signal of the
downstream converter (or some other signal able to indicate
that the power demand is low) should be applied to Pin 1.
Figure 63. Signal for Standby Detection
Rectified
AC line
NCP1605
PFC stage
Feedback of the
downstream converter
Standby Input
Voltage
C
SMPS
controller
downstream converter
+
V
CC
+
1
2
3
4
13
16
14
15
5
6
7
8 9
12
10
11
In normal operation, the circuit controls the continuous
absorption of the line current necessary for matching the load
power demand. When the voltage applied to Pin 1 goes below
300 mV:
" The output pulses are blanked and Pin 3
( V
CONTROL
) is grounded.
" The output of the PFC stage being not fed any more, it
drops. When the output voltage goes below 95.5% of
the regulation level, the circuit resumes operation until
FLAG1 becomes low (what means that the output
voltage has exceeded the regulation level).
" At that moment, if V
Pin1
is still below 300 mV, a new
skipping phase starts.
In other words, instead of continuously providing the
output with a small amount of power, the circuit operates
from time to time at a higher power level. As an example
and to make it simple, instead of continuously supplying
1% of P
MAX
, the circuit can provide the load with 10% of
P
MAX
for 10% of the time. The IC enters the socalled skip
cycle mode, also named controlled burst operation. This
burst operation is much more efficient compared to a
continuous power flow as it drastically reduces the number
of pulsations and therefore the switching losses associated
to them.
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