NCP1607BDR2G ON Semiconductor, NCP1607BDR2G Datasheet - Page 18

• 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

and rapid operating point changes respectively, while the
FPP protects the system against floating feedback pin
conditions. If FPP is not implemented and a manufacturing
error causes the feedback pin to float, then the feedback
voltage is dependent on the coupling within the system and
the surrounding environment. The coupled feedback
voltage may be within the regulation limits (i.e. above the
UVP threshold, but below V
to deliver excessive power. The result is that the output
voltage rises until a component fails due to the voltage
stress.
causes an error in the output voltage. The output voltage
including the error caused by R
using Equation 16:
voltage including the error caused by R
Overcurrent Protection (OCP)
and limits the driver on time if this current exceeds
V
maximum peak current can be adjusted by changing R
according to:
CS(limit)
UVP and OVP protect the system from low bulk voltages
The tradeoff for including FPP is that the value of R
Using the values from the OVP calculation, the output
A dedicated pin on the NCP1607 senses the peak current
Condition 1
Condition 2
R
R
. This level is 0.5 V (typical). Therefore, the
OUT1
OUT2
V
V
V
OUT
OUT
OUT
Condition 3
+ 400 ) 4 M @
+ V
I
peak
C
OUT
Control
COMP
+
) R
FB
REF
V
CS(limit)
R
OUT1
) and cause the controller
S
FB
4.7 M
R
2.5
FB
(V
@
Figure 37. Open Feedback Loop Protection
V
R
OUT
FB
+ 402 V
REF
V
FB
I
CONTROL
CONTROL
+
is equal to:
) is calculated
+
V
E/A
UVP
V
+
+
-
-
REF
(eq. 16)
(eq. 20)
http://onsemi.com
SENSE
UVP
FB
Enable
18
(Enable EA)
R
an equivalent resistor R
Equation 17.
R
The compensated output voltage is calculated using
Equation 19.
V
of switching noise falsely triggering the OCP limit. This
filter blanks out the first 250 ns (typical) of the current
sense signal. If additional filtering is necessary, a small RC
filter can be added between R
OUT
OUT2
EQ
The error caused by R
An internal LEB filter (Figure 38) reduces the likelihood
I
CONTROL
V
Measure
is used to calculate R
+ V
OUT
Clamp
Clamp
V
V
. The parallel combination of R
V
EAH
EAL
DD
R
R
R
REF
R
+ 2.5 @
EQ
EQ
OUT2
OUT2
I
Static OVP
CONTROL
Static OVP is triggered
when clamp is activated
Dynamic OVP
@
+ R
+ 4 M @
R
+
+
OUT1
4 M ) 25.29 k
OUT1
R
R
4.7 M * 25.16 k
25.16 k @ 4.7 M
FB
R
> I
EQ
25.29 k
OUT2
400 * 2.5
) R
ovp
* R
@
@ R
FB
V
OUT2
2.5
OUT2
EQ
OUT
FB
EQ
is compensated by adjusting
V
SENSE
* V
REF
.
that is calculated using
) 4 M @
) R
+ 25.16 kW
REF
+ 25.29 kW
and the CS pin.
OUT1
FB
4.7 M
2.5
and R
@
V
Fault
R
REF
+ 400 V
FB
OUT2
(eq. 17)
(eq. 18)
(eq. 19)
form