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| 型号： | NCP1601ADR2 |
| 厂商： | ON Semiconductor |
| 文件页数： | 10/19页 |
| 文件大小： | 257K |
| 描述： | IC CTRLR PFC FREQ DCM/CRM 8SOIC |
| 产品变化通告： | Discontinuation 30/Jun/2006 |
| 标准包装： | 1 |
| 模式： | 临界传导（CRM），间歇式（转换） |
| 频率 - 开关： | 58kHz |
| 电流 - 启动： | 17µA |
| 电源电压： | 12.5 V ~ 18 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 剪切带 (CT) |
| 其它名称： | NCP1601ADR2OSCT |
NCP1601A, NCP1601B
http://onsemi.com
10
FUNCTIONAL DESCRIPTION
Introduction
The NCP1601 is a Power Factor Correction (PFC) boost
controller designed to operate in Discontinuous
Conduction Mode (DCM) and Critical Conduction Mode
(CRM). The fixed- -frequency nature of DCM limits the
maximum switching frequency. It limits the possible
conducted and radiated EMI noise that may pollute
surroundingsystems.NCP1601offersthesimplestsolution
to PFC including fewer external circuit components and
simple voltage- -mode feedback. The diode turn- -off
switching loss is negligible and hence there is no need to
use a low reverse- -recovery time t
rr
diode. On the other
hand, the CRM feature is added to limit the maximum
currentstresstotwiceoftheaveragecurrent.TheNCP1601
incorporates high safety protection features and combines
the advantages of DCM and CRM so that the NCP1601 is
suitable for robust and compact PFC stages.
The NCP1601 provides the following protection features:
1. Overvoltage Protection (OVP) is activated and
the output drive goes low when the output voltage
exceeds 107% of the nominal regulation level
which is a user- -defined value. The circuit
automatically resumes operation when the output
voltage becomes lower than 107%.
2. Undervoltage Protection (UVP) is activated and
the device is shut down when the output voltage
goes below 8% of the nominal regulation level.
The circuit automatically resumes operation when
the output voltage goes above 8% of the nominal
regulation level. This feature also provides output
open- -loop protection and external shutdown
feature.
3. Overcurrent Protection (OCP) is activated and
the output device goes low when the inductor
current exceeds a user- -defined value. The
operation automatically resumes when the
inductor current becomes lower than this
user- -defined value at the next clock cycle.
4. Thermal Shutdown (TSD) is activated and the
output drive is disabled when the junction
temperature exceeds 140癈. The operation
resumes when the junction temperature falls
down by typical 45癈.
The NCP1601 is available in two versions. The
NCP1601A has a typical 4.75 V undervoltage lockout
(UVLO) hysteresis, while NCP1601B has a typical 1.5 V
UVLOhysteresis.ItallowstheuseofdifferentV
CC
biasing
schemes.
Operating Modes of NCP1601
The NCP1601 is a PFC driver primarily designed to
operate in fixed- -frequency DCM. In the most stressful
conditions, CRM can be an alternative option which is
without power factor degradation. On the other hand, the
NCP1601 can be viewed as a CRM controller with a
frequency clamp (maximum switching frequency limit)
alternative option which is also without power factor
degradation. In summary, the NCP1601 can cover both
CRM and DCM without power factor degradation. Based
on the selections of the boost inductor and the oscillator
frequency, the circuit is capable of the following three
applications.
1. Mostly in CRM with a frequency clamp set by
the oscillator or synchronization frequency.
2. Mostly in fixed- -frequency mode DCM and
only run in CRM at high load and low line.
3. Fixed- -frequency DCM only.
Figure 25. Operating Modes
Inductor current, I
L
Input current, I
in
time
Current
DCM
DCM
Critical Mode
DCM needs higher peak inductor current comparing to
CRM in the same averaged input current. Hence, CRM is
generallypreferredat aroundthe sinusoidalpeak forlower
the maximum current stress but DCM is also preferred at
the non- -peak region to avoid excessive switching
frequencies. Because of the variable- -frequency feature of
the CRM and constant- -frequency feature of DCM,
switching frequency is the maximum in the DCM region
andhence the minimumswitchingfrequencywillbefound
at the moment of the sinusoidal peak.
DCM PFC Circuit
A DCM/CRM PFC boost converter is shown in Figure 26.
Input voltage is a rectified 50 or60 Hz sinusoidal signal. The
MOSFET is switching at a high frequency (typically around
100 kHz) so that the inductor current I
L
basically consists of
high- -frequency and low- -frequency components.
FiltercapacitorC
filter
isanessentialandverysmallvalue
capacitor in order to eliminate the high- -frequency content
oftheDCMinductorcurrentI
L
.Thisfiltercapacitorcannot
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