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参数资料
| 型号： | NCP1608BDR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 18/24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
D
1
2
8
7
PFC(Vcc)
+
1
2
8
7
+
C bulk
3
4
6
5
3
4
6
5
V CC
+
+
+
+
NCP1608
NCP1230
?
Figure 40. NCP1608 Supplied by a Downstream SMPS Controller (NCP1230)
Soft Start
When V CC exceeds V CC(on) , t start begins counting. When
t start expires, the error amplifier is enabled and begins
charging the compensation network. The drive is enabled
when V Control exceeds Ct (offset) . The charging of the
compensation network slowly increases the drive on time
from the minimum time (t PWM ) to the steady state on time.
This creates a natural soft start mode that reduces the stress
of the power components (Figure 41).
Output Driver
The NCP1608 includes a powerful output driver capable
of sourcing 500 mA and sinking 800 mA. This enables the
controller to drive power MOSFETs efficiently for medium
power ( ≤ 350 W) applications. Additionally, the driver
stage provides both passive and active pull ? down circuits
(Figure 42). The pull ? down circuits force the driver output
to a voltage less than the turn ? on threshold voltage of a
V CC
I switch
FB
V REF
Control
Ct (offset)
V out
V CC(on)
V CC(off)
Natural Soft Start
power MOSFET when V CC(on) is not reached.
t start
Figure 41. Startup Timing Diagram Showing the
Natural Soft Start of the Control Pin
V CC
+
?
UVLO
V DD
V ddGD
UVLO
DRV IN
DRV
V DD REG
m V DD
GND
Figure 42. Output Driver Stage and Pull ? Down Circuits
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