NCP1654BP65G ON Semiconductor, NCP1654BP65G Datasheet - Page 19

• Manufacturer Part Number: NCP1654BP65G
• Description: IC PFC CCM STEP UP 8-PDIP
• Manufacturer: ON Semiconductor

Specifications of NCP1654BP65G

• Mode: Continuous Conduction (CCM)
• Frequency - Switching: 65kHz
• Current - Startup: 75µA
• Voltage - Supply: 10.5 V ~ 20 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: NCP1654BP65GOS

Undervoltage Protection (UVP) for Open Loop
Protection or Shutdown
the device is shut down and consumes less than 400 mA.
The device automatically starts operation when the output
voltage goes above 12% of V
boost converter configuration, the output voltage V
always greater than the input voltage V
signal V
enable NCP1654 to operate.
•
•
Current Sense
sense scheme in Figure 37. The device maintains the
voltage at CS pin to be zero voltage (i.e., V
(Equation 11),
can be formulated.
of components for current sensing. The sense current I
represents the inductor current I
As shown in Figure 44, when V
This Undervoltage Protection function has 2 purposes.
The device senses the inductor current I
This scheme has the advantage of the minimum number
Open Loop Protection − Protect the power stage from
damage at feedback loop abnormal, such as V
shorted to ground or the feedback resistor R
open.
Shutdown mode − Disables the PFC stage and forces a
low consumption mode. This feature helps to meet
stringent stand−by specifications. Power Factor being
not necessary in stand−by, the PFC stage is generally
inhibited to save the pre−converter losses. To further
improve the stand−by performance, the PFC controller
should consume minimum current in this mode.
I
STDN
I
CC2
fb
Figure 44. Undervoltage Protection
is always greater than 8% and 12% of V
8% V
I
cs
REF
Shutdown
+
R
SENSE
R
CS
REF
fb
L
. In normal situation of
I
12% V
and will be used in the
is less than 8% of V
L
,
in
REF
Operating
and the feedback
L
cs
by the current
≈ 0 V) so that
V
fbU
fb
fb
is
is
http://onsemi.com
REF
out
REF
to
is
cs
,
19
PFC duty modulation to generate the multiplier voltage
V
Protection. (Equation 11) would insist in the fact that it
provides the flexibility in the R
allows to detect in−rush currents.
Over−Current Protection (OCP)
than I
pin is typical 10 mV and it is neglected in the calculation.
Hence, the maximum OCP inductor current threshold
I
Drive Output of the device goes low. The device
automatically resumes operation when the inductor current
goes below the threshold.
Input Voltage Sense
sensing scheme in Figure 45. V
rectified input voltage V
external capacitor C
value of V
duty modulation and over−power limitation (OPL).
Brown−Out Protection
from operating as the input voltage is lower than expected.
Re−formulate (Equation 9) to get (Equation 21). Refer to
Figure 45, V
operating.
•
•
L(OCP)
m
V
Over−Current Protection is reached when I
When over−current protection threshold is reached, the
The device senses the rms input voltage V
The device uses the V
Before the device operates, V
value of rms input voltage, V
described in (Equation 21).
After device operates, V
input voltage. Thanks to C
rectified input voltage. Hence V
peak value of rms input voltage V
(Equation 22).
, Over−Power Limitation (OPL), and Over−Current
bo
S(OCP)
+
I
is obtained in (Equation 20).
L(OCP)
R
in
boL
. V
(200 mA typical). The offset voltage of the CS
R
in
) R
+
boL
V
bo
is different before and after the device
bo
R
is used for Brown−Out Protection, PFC
boU
+
CS
R
BO
SENSE
I
R
(V
S(OCP)
boL
is to maintain the V
in
bo
) +
R
in
) R
in
signal to protect the PFC stage
boL
+
via the resistor divider. An
is the rectified sinusoidal
BO
R
boU
boL
R
ac
, V
in
SENSE
R
SENSE
. Hence V
R
is equal to the peak
2 2
) R
bo
CS
bo
bo
boL
p
ac
decays to 2/p of the
is the average of
senses the average
boU
as described in
@ 200 mA
V
choice and that it
ac
bo
bo
2 V
the average
is as
cs
ac
ac
is larger
(eq. 20)
(eq. 21)
(eq. 22)
by the