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参数资料
| 型号： | NCP1607BDR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 19/23页 |
| 文件大小： | 255K |
| 描述： | IC PFC CONTROLLER CRM 8SOIC |
| 标准包装： | 1 |
| 模式： | 临界传导（CRM） |
| 电流 - 启动： | 23.5µA |
| 电源电压： | 9.5 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： | NCP1607BDR2GOSDKR |
NCP1607
http://onsemi.com
19
Figure 38. OCP Circuitry with Optional External RC
Filter
CS
+
OCP
LEB
DRV
optional
R
S
V
CS(limit)
SHUTDOWN MODE
The NCP1607 allows for two methods to place the
controller into a standby mode of operation. The FB pin can
be pulled below the UVP level (300 mV typical) or the ZCD
pin can be pulled below the V
SDL
level (200 mV typical).
If the FB pin is used for shutdown (Figure 39(a)), care must
be taken to ensure that no significant leakage current exists
on the shutdown circuitry. This could impact the output
voltage regulation. If the ZCD pin is used for shutdown
(Figure 39(b)), then any parasitic capacitance created by
the shutdown circuitry will add to the delay in detecting the
zero inductor current event.
Figure 39. Shutting Down the PFC Stage by Pulling FB to GND (A) or Pulling ZCD to GND (B)
1
4
3
2
8
5
6
7
NCP1607
Shutdown
Shutdown
R
ZCD
R
OUT2
R
OUT1
V
OUT
C
COMP
1
4
3
2
8
5
6
7
NCP1607
Figure 39(a)
Figure 39(b)
L
BOOST
FB
Control
Ct
CS
GND
ZCD
DRV
V
CC
FB
Control
Ct
CS
GND
ZCD
DRV
V
CC
To activate the shutdown feature on ZCD, the internal
clamp must first be overcome. This clamp will draw a
maximum of I
CL(NEG)
(5.0 mA maximum) before releasing
and allowing the ZCD pin voltage to drop low enough to
shutdown the part (Figure 40). After shutdown, the
comparator includes approximately 90 mV of hysteresis to
ensure noise free operation. A small current source (70 mA
typical) is also activated to pull the unit out of the shutdown
condition when the external pull down is released.
Figure 40. Shutdown Comparator and Current Draw to Overcome Negative Clamp
Shutdown
5 mA
~1 V
V
SDL
V
SDH
I
ZCD
V
CL(NEG)
~70 mA
Controller Disabled
Controller Enabled
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