NCP1654BD65R2G ON Semiconductor, NCP1654BD65R2G Datasheet - Page 17

• Manufacturer Part Number: NCP1654BD65R2G
• Description: IC PFC CONTROLLER CCM 8SOIC
• Manufacturer: ON Semiconductor

Specifications of NCP1654BD65R2G

• 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: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Switching Frequency: 72 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
• Other names: NCP1654BD65R2GOSTR

V
Overvoltage protection (OVP), fast transient response, and
Undervoltage protection (UVP)
Output Voltage Regulation
conductance Amplifier (OTA) as error amplifier. Refer to
Figure 38, the output of OTA V
from V
•
•
out
The feedback signal V
NCP1654 uses a high gain Operational Trans−
Overvoltage Protection: When V
105% of V
voltage), the Driver output of the device goes low for
protection. The circuit automatically resumes
operation when V
V
maximum output voltage is 105% of 390 V = 410 V.
Hence a cost & size effective bulk capacitor of lower
voltage rating is suitable for this application,
Dynamic response enhancer: NCP1654 drastically
speeds up the regulation loop by its internal 200 mA
enhanced current source when the output voltage is
below 95% of its regulation level. Under normal
REF
and will be used in the output voltage regulation,
CONTROL(min)
. If the nominal V
REF
(i.e. V
fb
to V
becomes lower than 105% of
out
out
fb
CONTROL(max)
> 105% of nominal output
represents the output voltage
is set at 390 V, then the
C
Figure 41. V
FB
−100
−150
−200
−250
−50
control
50
0
R
fb
fbU
2
Figure 40. OVP and Fast Transient Response
is higher than
200 mA raises
V
when V
95% V
operating range is
control
.
R
V
V
fbL
fb
control
REF
6
5
fb
fb
rapidly
2.2
vs. Current Flowing in/out from V
is below
105%
V
http://onsemi.com
95%
REF
V
V
2.4
REF
REF
Vfb
17
-
+
-
+
-
+
Fast Transient Response
output voltage of PFC stages may exhibit excessive over or
under−shoots because of abrupt load or input voltage
variations (such as start−up duration). As shown in
Figure 40, if the output voltage is out of regulation,
NCP1654 has 2 functions to maintain the output voltage
regulation.
decoupling capacitor next to feedback pin to prevent from
noise impact.
OTA
2.6
V
±20 mA
Given the low bandwidth of the regulation block, the
It is recommended to add a typical 100 pF capacitor C
condition, the maximum sink and source of output
current capability of OTA is around 28 mA. Thanks to
the “V
95% V
V
dropping too low and improve the transient response
performance. The relationship between current
flowing in/out V
Figure 41.
out
control
OVP
Low Detect
No DRV when
V
105% V
fb
out
REF
is above
rapidly. Hence prevent the PFC output from
2.8
low detect” block, when the V
+
, an extra 200 mA current source will raise
REF
200 mA
control
V
control
out
Vdd
3
Pin
pin and V
fb
is as shown in
fb
is below
FB