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| 型號(hào)： | NCP1605DR2G |
| 廠(chǎng)商： | ON Semiconductor |
| 文件頁(yè)數(shù)： | 17/32頁(yè) |
| 文件大小： | 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(kāi)關(guān)： | 250kHz |
| 電流 - 啟動(dòng)： | 12mA |
| 電源電壓： | 10 V ~ 20 V |
| 工作溫度： | 0°C ~ 125°C |
| 安裝類(lèi)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(chēng)： | NCP1605DR2GOSDKR |
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NCP1605, NCP1605A, NCP1605B
http://onsemi.com
17
DETAILED OPERATING DESCRIPTION
Introduction
The NCP1605 is a PFC driver designed to operate in fixed
frequency, Discontinuous Conduction Mode (DCM). In the
most stressful conditions, Critical Conduction Mode (CRM)
can be achieved without power factor degradation and the
circuit could be viewed as a CRM controller with a frequency
clamp (given by the oscillator). Finally, the NCP1605 tends
to give the best of both modes without their respective
drawbacks. Furthermore, the circuit incorporates protection
features for a rugged operation together with some special
circuitry to lower the power consumed by the PFC stage in no
load conditions. More generally, the NCP1605 functions
make it the ideal candidate in systems where
costeffectiveness, reliability, low standby power and high
power factor are the key parameters:
" Compactness and Flexibility: the controller requires
few external components while offering a large variety
of functions. Depending on the selected coil and
oscillator frequency you select, the circuit can:
1. Mostly operate in CRM and use the oscillator as a
frequency clamp.
2. Mostly operate in fixed frequency mode and only
run in CRM at high load and low line.
3. Permanently operate in fixed frequency mode
DCM.
In all cases, the circuit provides nearunity power factor.
Skipcycle capability for low power standby: among
other applications, the circuit targets power supply where
the PFC stage must keep alive even in standby. A
continuous flow of pulses is not compatible with noload
standby power requirements. Instead, the controller slices
the switching pattern in bunch of pulses to drastically
reduce the overall losses. The skip cycle operation is
initiated by applying to Pin 1, a signal that goes below
300 mV in standby. Typically, this signal is drawn from the
feedback of the downstream converter.
Startup Current Source and large V
CC
range:
meeting low standby power specifications represents a
difficult exercise when the controller requires an external,
lossy resistor connected to the bulk capacitor. The
controller disables the highvoltage current source after
startup which no longer hampers the consumption in
noload situations. In addition, the large V
CC
range (10 V
to 20 V after startup), highly eases the circuit biasing.
Fast Line / Load Transient Compensation: given the
low bandwidth of the regulation block, the output voltage
of PFC stages may exhibit excessive over and undershoots
because of abrupt load or input voltage variations (e.g. at
startup). If the output voltage is too far from the regulation
level:
The NCP1605 disables the drive to stop
delivering power as long as the output voltage
exceeds the Overvoltage Protection (OVP) level.
The NCP1605 drastically speeds up the
regulation loop when the output voltage is below
95.5% of its regulation level. This function is
allowed only after the PFC stage has started up
not to eliminate the softstart effect.
PFC OK: the circuit detects when the circuit is in normal
situation or if on the contrary, it is in a startup or fault
condition. In the first case, Pin 12 is in high state and low
otherwise. Pin 12 serves to control the downstream
converter operation in response to the PFC state.
Safety Protections: the NCP1605 permanently
monitors the input and output voltages, the coil current and
the die temperature to protect the system from possible
overstresses and make the PFC stage extremely robust and
reliable. In addition to the aforementioned OVP protection,
one can list:
Maximum Current Limit and Zero Current
Detection: the circuit permanently senses the
coil current and immediately turns off the
power switch if it is higher than the set current
limit. It also prevents any turn on of the power
switch as long as some current flows through
the coil, to ensure operation in DCM. This
feature also protects the MOSFET from the
excessive stress that could result from the
large inrush currents that occurs during the
startup phases.
Undervoltage Protection: the circuit turns off
when it detects that the output voltage goes
below 12% of the OVP level (typically). This
feature protects the PFC stage from starting
operation in case of too low ac line conditions
or in case of a failure in the OVP monitoring
network (e.g., bad connection).
BrownOut Detection: the circuit detects too
low ac line conditions and stop operating in
this case. This protection protects the PFC
stage from the excessive stress that could
damage it in such conditions.
Thermal Shutdown: an internal thermal
circuitry disables the circuit gate drive and then
keeps the power switch off when the junction
temperature exceeds 150癈 typically. The circuit
resumes operation once the temperature drops
below about 100癈 (50癈 hysteresis).
Output Stage Totem Pole: the NCP1605 incorporates a
0.5 A / +0.8 A gate driver to efficiently drive most TO220
or TO247 power MOSFETs.
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