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| 型号： | NCP1608BDR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 20/24页 |
| 文件大小： | 0K |
| 描述： | IC PFC CTLR/PRECONVERTER 8-SOIC |
| 标准包装： | 1 |
| 模式： | 临界传导（CRM） |
| 电流 - 启动： | 24µA |
| 电源电压： | 10.2 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： | NCP1608BDR2GOSDKR |
NCP1608
3. FPP Protection: The FB pin is floating. R FB
pulls down the FB voltage below V UVP . The UVP
comparator detects an UVP fault and the drive
and error amplifier are disabled.
UVP and OVP protect the system from low bulk voltages
and rapid operating point changes respectively, while FPP
protects the system against floating feedback pin
conditions. If FPP is not implemented and a manufacturing
error causes the FB pin to float, then V FB is dependent on
the coupling within the system and the surrounding
environment. The coupled V FB may be within the
regulation limits (i.e. V UVP < V FB < V REF ) and cause the
controller to deliver excessive power. The result is that V out
increases until a component fails due to the voltage stress.
+ OVP
?
?
C bulk
V out
R out1
V OVP
UVP
+
V UVP
POK
Condition 1
Condition 2
FB
Condition 3
E/A
?
+
g m
(Enable EA)
R out2
Control
C COMP
R FB
V REF
V Control
V EAH
Clamp
Fault
Figure 44. Open Feedback Loop Protection
Overcurrent Protection (OCP)
The dedicated CS pin of the NCP1608 senses the
inductor peak current and limits the driver on time if the
voltage of the CS pin exceeds V ILIM . The maximum
inductor peak current is programmed by adjusting R sense .
The inductor peak current is calculated using Equation 18:
Shutdown Mode
The NCP1608 enables the user to set the controller in a
standby mode of operation. To shutdown the controller, the
FB pin is forced to less than V UVP . When using the FB pin
for shutdown (Figure 46), the designer must ensure that no
significant leakage current exists in the shutdown circuitry.
I L(peak) +
V ILIM
R sense
(eq. 18)
Any leakage current affects the output voltage regulation.
V out
An internal LEB filter (Figure 45) reduces the
probability of switching noise inadvertently triggering the
overcurrent limit. This filter blanks out the CS signal for a
duration of t LEB . If additional filtering is necessary, a small
RC filter is connected between R sense and the CS pin.
R out1
1
2
NCP1608
8
7
DRV
CS
LEB
+
?
OCP
Shutdown
R out2
3
4
6
5
R sense
optional
V ILIM
Figure 45. OCP Circuitry with Optional
External RC Filter
http://onsemi.com
20
Figure 46. Shutting Down the PFC Stage
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