NCP1607BDR2G ON Semiconductor, NCP1607BDR2G Datasheet - Page 16

• Manufacturer Part Number: NCP1607BDR2G
• Description: IC PFC CONTROLLER CRM 8SOIC
• Manufacturer: ON Semiconductor

Specifications of NCP1607BDR2G

• Mode: Critical Conduction (CRM)
• Current - Startup: 23.5µA
• Voltage - Supply: 9.5 V ~ 20 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Switching Frequency: 70 KHz
• Maximum Power Dissipation: 450 mW
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Frequency - Switching: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

R
this equilibrium state, no current flows through the
compensation capacitor (C
These facts allow the following equations to be derived:
•
•
•
Conversely, when V
output of the error amplifier sinks or sources the current
necessary to maintain V
In the case of an overvoltage condition:
•
•
I
I
ROUT1
ROUT2
OUT1
When the output voltage is in steady state equilibrium,
Under stable conditions, Equations 7 through 9 are true.
The R
The R
And since no current flows through C
The error amplifier maintains V
R
value:
The R
Equation 11:
EQ
and R
current remains the same as the steady state
R
OUT1
EQ
OUT1
R
OUT1
OUT2
V
current is:
OUT2
I
OUT
ROUT1
current is:
I
current is increased and is calculated using
EQ
I
ROUT1
+
regulate the FB voltage to V
Control
+
V
OUT
R
C
I
REF
RFB
EQ
V
COMP
I
FB
EQ
+
REF
OUT
is not at the target voltage, the
+ I
R
V
+
OUT1
COMP
on pin 1.
OUT
* V
ROUT2
V
R
R
REF
EQ
OUT1
* V
REF
R
REF
shown in Figure 34).
FB
) I
*
REF
on pin 1, and the
FB
V
R
Figure 34. OVP and UVP Circuit Blocks
COMP
I
V
REF
CONTROL
+
EQ
CONTROL
+
,
REF
V
E/A
UVP
V
+
+
−
−
REF
. During
(eq. 10)
http://onsemi.com
(eq. 7)
(eq. 8)
(eq. 9)
UVP
Enable
16
(Enable EA)
•
I
expression of the current sunk by the error amplifier:
the output voltage excess. The circuit senses this current
and disables the drive (pin 7) when I
(10.4 mA typical). The OVP threshold is calculated using
Equation 13.
calculated using Equation 14.
and 400 V is the target output voltage, then R
calculated using Equation 14.
I
ROUT1
Control
where DV
The combination of Equations 2 and 12 yield a simple
The current absorbed by pin 2 (I
The OVP limit is set by adjusting R
For example, if 440 V is the maximum output voltage
If R
The error amplifier sinks:
I
Measure
CONTROL
OUT1
+ I
Clamp
Clamp
+
V
V
V
EAL
EAH
DD
V
ROUT1
V
OUT(OVP)
is selected as 4 MW,, then V
R
OUT
OUT(OVP)
OUT1
Static OVP
I
Static OVP is triggered
when clamp is activated.
R
CONTROL
Dynamic OVP
R
OUT1
* I
is the output voltage excess.
OUT1
+ 440 * 400
I
CONTROL
EQ
* V
+
+ V
+
> I
10.4m
V
REF
ovp
V
OUT(OVP)
OUT
OUT
+
+
) R
I
V
) DV
DV
R
OVP
+ 3.846 MW
OUT
OUT1
Control
R
OUT
OUT1
* V
OUT1
) DV
OUT
Control
OUT
) is proportional to
OUT(OVP)
@ I
R
OUT1
* V
OUT1
OVP
OUT
exceeds I
REF
. R
Fault
* V
= 442 V.
*
OUT1
OUT1
(eq. 12)
(eq. 13)
(eq. 14)
(eq. 11)
REF
V
R
OVP
REF
EQ
is
is