NCP1631DR2G ON Semiconductor, NCP1631DR2G Datasheet - Page 16

• Manufacturer Part Number: NCP1631DR2G
• Description: IC CTLR PFC INTERLEAVED 16SOIC
• Manufacturer: ON Semiconductor

Specifications of NCP1631DR2G

• Mode: Critical Conduction (CRM), Discontinuous Conduction (DCM)
• Frequency - Switching: 130kHz
• Current - Startup: 100µA
• Voltage - Supply: 10 V ~ 15 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

− However, the coil current can possibly be non
R
C
FFOLD
FF
OSC
OS C
zero when the clock signal turns high. The
circuit would enter Continuous Conduction
Mode (CCM) if the MOSFET turned on in that
moment. In order to avoid CCM operation, the
clock is prevented from setting the PWM latch
until the core is reset (that is as low as “V
of Figure 8 is low). The clock signal remains
high during this waiting phase (refer to
Figure 12). Hence the next MOSFET
conduction time occurs as soon as the coil
I
I
OSC(CH)
OSC(DISCH)
V
REGUL
= I
FF
V
= I
V
pfcOK
OSC(high)
I
OSC(low)
FF
FF
Q_ph1
I
Q_ph2
OSC(clamp)
Co mp _OSC
/
Figure 16. Oscillator Block
I
FF
http://onsemi.com
ZCD
Current
Mirror
”
SYNC
divider
by tw o
SYNCbar
16
following equation:
where C
4 parasitic capacitance (about 10 pF).
The clamp frequency can be computed using the
DRV 1
105 mA
OSC
DRV 2
current has totally vanished. In other words,
critical conduction mode (CrM) operation is
obtained.
is the pin 4 external capacitor and C
Circuitry for
Frequency Foldback
f
osc
^
Ge nera tion
Ge nera tion
R
S
S
R
SYNCbar
C
CLK1
CLK2
latch
latch
OSC
V
60 m
REGUL
) 10 p
Q
Q
SYNCbar
Q_ph2
Q_ph1
CL K1
CL K2
pin
(eq. 17)
the pin