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| 型号： | NCP1606BDR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 15/22页 |
| 文件大小： | 245K |
| 描述： | IC POWER FACTOR CONTROLLER 8SOIC |
| 标准包装： | 1 |
| 模式： | 临界传导（CRM） |
| 电流 - 启动： | 20µA |
| 电源电压： | 10.3 V ~ 20 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： | 标准包装 |
| 其它名称： | NCP1606BDR2GOSDKR |
NCP1606
http://onsemi.com
15
Figure 32. Startup Timing Diagram Showing the
Natural Soft Start of the Control Pin
FB
Control
2.5 V
Natural Soft Start
V
CC
I
switch
V
EAL
V
OUT
V
CC(off)
V
CC(on)
OUTPUT DRIVER
The NCP1606 includes a powerful output driver capable
of peak currents of +500 mA and 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
DD
REG
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 NCP1606 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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