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| 型号： | NCP1607BDR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 10/23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
10
input current to stay in phase with the input voltage. These
circuits operate at a higher frequency and so they are
smaller, lighter in weight, and more efficient than a passive
circuit. With proper control of an active PFC stage, almost
any complex load can be made to appear in phase with the
ac line, thus significantly reducing the harmonic current
content. Because of these advantages, active PFC circuits
have become the most popular way to meet harmonic
content requirements. Generally, they consist of inserting
a PFC preregulator between the rectifier bridge and the
bulk capacitor (Figure 22).
Figure 22. Active PFC PreConverter with the NCP1607
Rectifiers
+
AC Line
High
Frequency
Bypass
Capacitor
NCP1607
PFC Preconverter
Converter
Load
+
Bulk
Storage
Capacitor
The boost (or step up) converter is the most popular
topology for active power factor correction. With the
proper control, it produces a constant voltage while
drawing a sinusoidal current from the line. For medium
power (<300 W) applications, critical conduction mode
(also called borderline conduction mode) is the preferred
control method. Critical conduction mode (CRM) occurs at
the boundary between discontinuous conduction mode
(DCM) and continuous conduction mode (CCM). In CRM,
the next driver on time is initiated when the boost inductor
current reaches zero. CRM operation is an ideal choice for
medium power PFC boost stages because it combines the
lower peak currents of CCM operation with the zero current
switching of DCM operation. The operation and
waveforms in a PFC boost converter are illustrated in
Figure 23.
Figure 23. Schematic and Waveforms of an Ideal CRM Boost Converter
Diode Bridge
IN
+
L
Diode Bridge
IN
+
L
+
The power switch is ON
The power switch is OFF
Critical Conduction Mode:
Next current cycle starts as
soon as the core is reset.
Coil
Current
+
With the power switch voltage being about zero, the
input voltage is applied across the coil. The coil current
linearly increases with a (V
IN
/L) slope.
The coil current flows through the diode. The coil voltage is (V
OUT
V
IN
) and the coil current linearly decays with a (V
OUT
V
IN
)/L slope.
V
OUT
(V
OUT
V
IN
)/L
I
L(pk)
I
L
V
IN
V
drain
V
drain
V
IN
/L
V
OUT
V
IN
If next cycle does not start
then V
drain
rings towards V
IN
+
I
L
V
IN
V
drain
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