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| 型號(hào)： | NCP1607BDR2G |
| 廠商： | ON Semiconductor |
| 文件頁(yè)數(shù)： | 9/23頁(yè) |
| 文件大小： | 255K |
| 描述： | IC PFC CONTROLLER CRM 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 模式： | 臨界傳導(dǎo)（CRM） |
| 電流 - 啟動(dòng)： | 23.5µA |
| 電源電壓： | 9.5 V ~ 20 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOICN |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱(chēng)： | NCP1607BDR2GOSDKR |
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NCP1607
http://onsemi.com
9
Introduction
The NCP1607 is a voltage mode power factor correction
(PFC) controller designed to drive cost effective
preconverters to meet input line harmonic regulations.
This controller operates in critical conduction mode
(CRM) for optimal performance in applications up to
250 W. Its voltage mode scheme enables it to obtain unity
power factor without the need for a line sensing network.
The output voltage is accurately controlled by a high
precision error amplifier. The controller also implements a
comprehensive array of safety features for robust designs.
The key features of the NCP1607 are as follows:
" Constant on time (Voltage Mode) CRM operation.
High power factor ratios are easily obtained without
the need for input voltage sensing. This allows for
optimal standby power consumption.
" Accurate and Programmable On Time Limitation. The
NCP1607 uses an accurate current source and an
external capacitor to generate the on time.
" High Precision Voltage Reference. The error amplifier
reference voltage is guaranteed at 2.5 V ?.6% over
process, temperature, and voltage supply levels. This
results in very accurate output voltages.
" Very Low Startup Current Consumption. The circuit
consumption is reduced to a minimum (< 40 mA)
during the startup phase, allowing fast, low loss,
charging of V
CC
. The architecture of the NCP1607
gives a controlled undervoltage lockout level and
provides ample V
CC
hysteresis during startup.
" Powerful Output Driver. A Source 500 mA / Sink
800 mA totem pole gate driver is used to provide rapid
turn on and turn off times. This allows for improved
efficiencies and the ability to drive higher power
MOSFETs. Additionally, a combination of active and
passive circuitry is used to ensure that the driver
output voltage does not float high while V
CC
is below
its turn on level.
" Programmable Overvoltage Protection (OVP). The
adjustable OVP feature protects the PFC stage against
excessive output overshoots that could damage the
application. These events can typically occur during
the startup phase or when the load is abruptly
removed.
" Protection against Open Feedback Loop
(Undervoltage Protection). Undervoltage protection
(UVP) disables the PFC stage when the output voltage
is excessively low. This also protects the circuit in
case of a failure in the feedback network: if no voltage
is applied to FB because of a poor connection or if the
FB pin is floating, UVP is activated shutting down the
converter.
" Overcurrent Limitation. The peak current is accurately
limited on a pulse by pulse basis. The level is
adjustable by modifying the current sense resistor. An
integrated LEB filter reduces the chance of noise
prematurely triggering the overcurrent limit.
" Shutdown Features. The PFC preconverter is placed
in a shutdown mode by grounding the FB pin or the
ZCD pin. During this mode, the I
CC
current
consumption is reduced and the error amplifier is
disabled.
Application information
Most electronic ballasts and switching power supplies
use a diode bridge rectifier and a bulk storage capacitor to
produce a dc voltage from the utility ac line (Figure 20).
This DC voltage is then processed by additional circuitry
to drive the desired output.
Figure 20. Typical Circuit without PFC
Load
Converter
Rectifiers
Bulk
Storage
Capacitor
+
AC
Line
This simple rectifying circuit draws power from the line
when the instantaneous ac voltage exceeds the capacitor
voltage. Since this occurs near the line voltage peak, the
resulting current draw is non sinusoidal and contains a very
high harmonic content. This results in a poor power factor
(typically < 0.6) and consequently, the apparent input
power is much higher than the real power delivered to the
load. Additionally, if multiple devices are tied to the same
input line, the effect is magnified and a line sag effect can
be produced (see Figure 21).
Figure 21. Typical Line Waveforms without PFC
Line
Sag
Rectified DC
AC Line Voltage
AC Line Current
0
0
V
pk
Increasingly, government regulations and utility
requirements necessitate control over the line current
harmonic content. To meet this need, power factor
correction is implemented with either a passive or active
circuit. Passive circuits usually contain a combination of
large capacitors, inductors, and rectifiers that operate at the
ac line frequency. Active circuits incorporate some form of
a high frequency switching converter that regulates the
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