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参数资料
| 型号： | NCP1608BDR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 17/24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
V Control
0.55
Ct (offset)
Low V Control Voltage
0.50
0.45
0.40
V in = 265 Vac
NCP1608
V Ct
Noise Induced Voltage Spike
0.35
0.30
V Ct(off)
V Control ? Ct (offset)
Low V Ct(off) Voltage
0.25
0.20
0.15
3 V Control
Range
0.10
DRV
0.05
0
25
75 125 175
225
275
V ZCD
V ZCD(ARM)
V ZCD(TRIG)
V ZCD(ARM)
is Not Exceeded
P out , OUTPUT POWER (W)
Figure 38. Comparison of Ct Charging Threshold
vs. Output Power
Startup
V CL(NEG)
t on(loop)
DRV Remains Off
0V
Generally, a resistor connected between the rectified ac
line and V CC charges the V CC capacitor to V CC(on) . The low
startup current consumption (< 35 m A) enables minimized
standby power dissipation and reduced startup durations.
When V CC exceeds V CC(on) , the internal references and
logic of the NCP1608 are enabled. The controller includes
t on t start
Figure 37. Ct Pin Noise Induced On Time
Reduction and Pulse Skipping
The wide control range of the NCP1608 increases
an undervoltage lockout (UVLO) feature that ensures that
the NCP1608 is enabled until V CC decreases to less than
V CC(off) . This hysteresis ensures sufficient time for the
auxiliary winding to supply V CC (Figure 39).
V Control and V Ct(off) in comparison to devices with less
control range. Figure 38 compares V Ct(off) of the NCP1608
to a device with a 3 V control range for an application with
the following parameters:
V CC
V CC(on)
V CC(off)
P out = 250 W
L = 200 m H
h = 92%
Vac LL = 85 Vac
Vac HL = 265 Vac
Figure 38 shows that V Ct(off) of the NCP1608 is 50%
larger than the 3 V control range device. The 50% increase
enables the NCP1608 to prevent inadvertent skipping at
high input voltages and high output power.
Figure 39. Typical V CC Startup Waveform
When the PFC pre-converter is loaded by a switch ? mode
power supply (SMPS), it is generally preferable for the
SMPS controller to startup first. The SMPS then supplies
the NCP1608 V CC . Advanced controllers, such as the
NCP1230 or NCP1381, control the enabling of the PFC
stage (see Figure 40) and achieve optimal system
performance. This sequence eliminates the startup resistors
and improves the standby power dissipation of the system.
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