參數(shù)資料
型號： NCP1607BDR2G
廠商： ON Semiconductor
文件頁數(shù)： 16/23頁
文件大小： 255K
描述： IC PFC CONTROLLER CRM 8SOIC
標(biāo)準(zhǔn)包裝： 1
模式： 臨界傳導(dǎo)（CRM）
電流 - 啟動： 23.5µA
電源電壓： 9.5 V ~ 20 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 8-SOICN
包裝： 標(biāo)準(zhǔn)包裝
其它名稱： NCP1607BDR2GOSDKR
NCP1607
http://onsemi.com
16
Figure 34. OVP and UVP Circuit Blocks
FB
Control
+

E/A
+

Measure
UVP
Fault
Dynamic OVP
V
EAH
Clamp
Static OVP is triggered
when clamp is activated.
V
EAL
Clamp
Static OVP
Enable
(Enable EA)
R
OUT2
R
OUT1
C
COMP
V
DD
I
CONTROL
 > I
ovp
I
CONTROL
V
OUT
I
CONTROL
V
CONTROL
R
FB
I
ROUT1
I
ROUT2
V
REF
V
UVP
I
RFB
When the output voltage is in steady state equilibrium,
R
OUT1
 and R
OUT2
 regulate the FB voltage to V
REF
. During
this equilibrium state, no current flows through the
compensation capacitor (C
COMP
  shown in Figure 34).
These facts allow the following equations to be derived:
" The R
OUT1
 current is:
I
ROUT1
+
V
OUT
* V
REF
R
OUT1
(eq. 7)
" The R
EQ
 current is:
I
EQ
+
V
REF
R
EQ
+ I
ROUT2
) I
FB
(eq. 8)
" And since no current flows through C
COMP
,
I
ROUT1
+
V
OUT
* V
REF
R
OUT1
*
V
REF
R
EQ
(eq. 9)
Under stable conditions, Equations 7 through 9 are true.
Conversely, when V
OUT
 is not at the target voltage, the
output of the error amplifier sinks or sources the current
necessary to maintain V
REF
 on pin 1.
In the case of an overvoltage condition:
" The error amplifier maintains V
REF
 on pin 1, and the
R
EQ
 current remains the same as the steady state
value:
I
EQ
+
V
REF
R
EQ
(eq. 10)
" The R
OUT1
 current is increased and is calculated using
Equation 11:
I
ROUT1
+
V
OUT(OVP)
* V
REF
R
OUT1
+
V
OUT
) DV
OUT
* V
REF
R
OUT1
(eq. 11)
where DV
OUT
 is the output voltage excess.
" The error amplifier sinks:
I
Control
+ I
ROUT1
* I
EQ
+
V
OUT
) DV
OUT
* V
REF
R
OUT1
*
V
REF
R
EQ
(eq. 12)
The combination of Equations 2 and 12 yield a simple
expression of the current sunk by the error amplifier:
I
CONTROL
+
DV
OUT
R
OUT1
The current absorbed by pin 2 (I
Control
) is proportional to
the output voltage excess. The circuit senses this current
and disables the drive (pin 7) when I
Control
 exceeds I
OVP
(10.4 mA typical). The OVP threshold is calculated using
Equation 13.
V
OUT(OVP)
+ V
OUT
) R
OUT1
@ I
OVP
(eq. 13)
The OVP limit is set by adjusting R
OUT1
. R
OUT1
  is
calculated using Equation 14.
R
OUT1
+
V
OUT(OVP)
* V
OUT
I
OVP
(eq. 14)
For example, if 440 V is the maximum output voltage
and 400 V is the target output voltage, then R
OUT1
 is
calculated using Equation 14.
R
OUT1
+
440 * 400
10.4m
+ 3.846 MW
If R
OUT1
 is selected as 4 MW,, then V
OUT(OVP)
 = 442 V.
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