參數(shù)資料
型號(hào)： NCP1607BDR2G
廠商： ON Semiconductor
文件頁(yè)數(shù)： 15/23頁(yè)
文件大?。?/td> 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： NCP1607BDR2GOSDKR
NCP1607
http://onsemi.com
15
Figure 32. Startup Timing Diagram Showing the
Natural Soft Start of the Control Pin
FB
Control
Natural Soft Start
V
CC
I
M
V
EAL
V
OUT
V
CC(off)
V
CC(on)
V
REF
OUTPUT DRIVER
The NCP1607 includes a powerful output driver capable
of peak currents of Source 500 mA / Sink 800 mA. This
enables the controller to efficiently drive power MOSFETs
for   medium   power   (up   to   300   W)   applications.
Additionally, the driver stage is equipped with both passive
and active pull down clamps (Figure 33). The clamps are
active when V
CC
 is off and force the driver output to well
below the threshold voltage of a power MOSFET.
Figure 33. Output Driver Stage and Pull Down Clamps
UVLO
DRV
GND
+

DRV IN
uV
DD
V
CC
V
DD
V
DDGD
V
DDREG
UVLO
Overvoltage Protection
The low bandwidth of the feedback network makes
active PFC stages very slow systems. One consequence of
this is the risk of huge overshoots in abrupt transient phases
(startup, load steps, etc.). For reliable operation, it is
critical that some form of overvoltage protection (OVP)
effectively prevents the output voltage from rising too
high. The NCP1607 detects these excessive V
OUT
 levels
and disables the driver until the output voltage returns to
nominal levels. This keeps the output voltage within an
acceptable range. The limit is adjustable so that the
overvoltage level can be optimally set. The level must not
be so low that it is triggered by the 100 or 120 Hz ripple of
the output voltage, but it must be low enough so as not to
require a larger voltage rating of the output capacitor.
Figure 34 depicts the operation of the OVP circuitry.
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