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參數資料
| 型號： | NCP1603D100R2G |
| 廠商： | ON Semiconductor |
| 文件頁數： | 25/30頁 |
| 文件大小： | 302K |
| 描述： | IC CTLR PFC/PWM COMBO 16-SOIC |
| 產品變化通告： | Product Discontinuation 21/Jun/2007 |
| 標準包裝： | 2,500 |
| 模式： | 臨界傳導（CRM），間歇導電（DCM） |
| 頻率 - 開關： | 58kHz |
| 電流 - 啟動： | 17µA |
| 電源電壓： | 9 V ~ 18 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 16-SOIC |
| 包裝： | 帶卷 (TR) |
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NCP1603
http://onsemi.com
25
It is obvious that the I
L(ZCD)
is not always zero. In order
to make it reasonably close to zero, the setting of R
S1
and
R
CS1
are crucial.
Figure 65. CS Pin Characteristic when I
L
= 0
I
S(ZCD)
V
S(ZCD)
R
S1
> R
S(ZCD)
R
S1
= R
S(ZCD)
V
S
Operating ZCD point
Ideal ZCD point
I
S
Based on the CS pin (Pin 4) characteristics in Figure 35,
Figure 65 is studied here. When the inductor current is
exactly zero (i.e., I
L(ZCD)
= 0), the ideal ZCD point in the
Figure 65 is reached where R
S1
is R
S(ZCD)
(536 W typical).
Considering the tolerance, the actual sense resistor R
S1
is
needed to be higher than the ideal value of R
S(ZCD)
to
ensure that zero current signal is generated when sense
current is smaller than the ZCD threshold (i.e., I
S
<
I
S(ZCD)
). That is,
R
S
u R
S(ZCD)
+
V
S(ZCD)
I
S(ZCD)
(eq. 22)
The higher value of R
S1
makes the bigger distance
between the operating and ideal ZCD points in Figure 65.
Hence, R
S1
has to be as low value as possible. The best
recommended value of R
S1
is therefore the maximum of
R
S(ZCD)
that is 1.0 kW.
Now that the R
S1
is set at a particular value that is greater
than R
S(ZCD)
. From Equation 20, the operating lines in
Equation 23 with different inductor currents I
L
of
Equation 20 are studied.
V
S
+ R
S1
I
S
* R
CS1
I
L
(eq. 23)
These operating lines are added in Figure 65 to formulate
Figure 66. When the inductor current I
L
is smaller than
I
L(ZCD)
, the sense current I
S
is smaller than I
S(ZCD)
and
hence the zero current signal is generated.
Figure 66. CS Pin Characteristic with Different
Inductor Current
I
S(ZCD)
V
S(ZCD)
V
S
Operating
ZCD point
I
S
Best
ZCD
point
I
L
= I
L(ZCD)
I
L
> I
L(ZCD)
I
L
= 0
It is noted in Figure 66 and Equation 23 that when the
(R
CS1
I
L
) term is smaller the error or distance between the
lines to the line I
L
= 0 is smaller. Therefore, the value of the
current sense resistor R
CS1
is also recommended to be as
small as possible to minimize the error in the zero current
detection.
Overcurrent Protection (OCP) in PFC Section
Overcurrent protection is reached when I
S
is larger than
I
S(OCP)
(200 mA typical). The offset voltage of the CS pin
is V
S(OCP)
(3.2 mV typical) in this condition. That is:
I
L(OCP)
+
R
S1
I
S(OCP)
* V
S(OCP)
R
CS1
(eq. 24)
When overcurrent protection threshold is reached, the
Drive Output of the device goes low.
Oscillator/Synchronization Block in PFC Section
Figure 67. Oscillator / Synchronization Block
in PFC Section
Oscillator Clock
S
R
Q
Zero Current
Turn on
MOSFET
+
5 V/3.5 V
Osc
delay
0
5
1
45 mA
94 mA
&
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