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| 型号： | NCP1608BDR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 12/24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
When the switch is closed, the inductor current increases
linearly to the peak value. When the switch opens, the
inductor current linearly decreases to zero. When the
inductor current decreases to zero, the drain voltage of the
switch (V drain ) is floating and begins to decrease. If the next
switching cycle does not begin, then V drain rings towards
V in . A derivation of equations found in AND8123 leads to
the result that high power factor in CrM operation is
V in(peak)
I L(peak)
I in(peak)
V in (t)
I L (t)
I in (t)
ton + (eq. 1)
achieved when the on time (t on ) of the switch is constant
during an ac cycle and is calculated using Equation 1.
2 @ P out @ L
h @ Vac 2
MOSFET
ON
OFF
Where P out is the output power, L is the inductor value, h
is the efficiency, and Vac is the rms input voltage.
A description of the switching over an ac line cycle is
illustrated in Figure 28. The on time is constant, but the off
time varies and is dependent on the instantaneous line
voltage. The constant on time causes the peak inductor
current (I L(peak) ) to scale with the ac line voltage. The
NCP1608 represents an ideal method to implement a
constant on time CrM control in a cost ? effective and robust
solution by incorporating an accurate regulation circuit, a
low current consumption startup circuit, and advanced
protection features.
Figure 28. Inductor Waveform During CrM Operation
Error Amplifier Regulation
The NCP1608 regulates the boost output voltage using
an internal error amplifier (EA). The negative terminal of
the EA is pinned out to FB, the positive terminal is
connected to a 2.5 V ± 1.6% reference (V REF ), and the EA
output is pinned out to Control (Figure 29).
A feature of using a transconductance error amplifier is
that the FB pin voltage is only determined by the resistor
divider network connected to the output voltage, not the
operation of the amplifier. This enables the FB pin to be
used for sensing overvoltage or undervoltage conditions
independently of the error amplifier.
+ OVP
?
OVP Fault
V out
V OVP
? UVP
+
POK
UVP Fault
R out1
R out2
FB
R FB
V UVP
EA
?
+
gm
V REF
(Enable EA)
t on(MAX)
PWM BLOCK
Slope +
Ct
I charge
Control
C COMP
V Control
t on
t PWM
Ct (offset)
V EAH
V Control
Figure 29. Error Amplifier and On Time Regulation Circuits
http://onsemi.com
12
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