NCP1608BDR2G ON Semiconductor, NCP1608BDR2G Datasheet - Page 11

• Manufacturer Part Number: NCP1608BDR2G
• Description: IC PFC CTLR/PRECONVERTER 8-SOIC
• Manufacturer: ON Semiconductor

Specifications of NCP1608BDR2G

• Mode: Critical Conduction (CRM)
• Frequency - Switching: Adjustable
• Current - Startup: 24µA
• Voltage - Supply: 8.8 V ~ 12.5 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

high frequency switching converter to regulate the input
current harmonics. Active circuits operate at a higher
frequency, which enables them to be physically smaller,
weigh less, and operate more efficiently than a passive
circuit. With proper control of an active PFC stage, almost
any complex load emulates a linear resistance, which
topology for active power factor correction. With the
proper control, it produces a constant voltage while
consuming a sinusoidal current from the line. For medium
power (<350 W) applications, CrM is the preferred control
method.
discontinuous conduction mode (DCM) and continuous
AC Line
AC Line
The boost (or step up) converter is the most popular
With the power switch voltage being about zero, the
input voltage is applied across the inductor. The inductor
current linearly increases with a (V
CrM
Diode Bridge
V
Inductor
Current
drain
The power switch is ON
Rectifiers
occurs
Figure 27. Schematic and Waveforms of an Ideal CrM Boost Converter
+
−
at
V
in
+
Figure 26. Active PFC Pre−Converter with the NCP1608
the
+
in
/L) slope.
V
High
Frequency
Bypass
Capacitor
in
boundary
/L
L
V
out
I
L(peak)
V
I
L
drain
between
http://onsemi.com
NCP1608
PFC Pre−Converter
AC Line
11
The inductor current flows through the diode. The inductor
voltage is (V
with a (V
significantly reduces the harmonic current content. Active
PFC circuits are the most popular way to meet harmonic
content requirements because of the aforementioned
benefits. Generally, active PFC circuits consist of inserting
a PFC pre−converter between the rectifier bridge and the
bulk capacitor (Figure 26).
conduction mode (CCM). In CrM, the driver on time begins
when the boost inductor current reaches zero. CrM
operation is an ideal choice for medium power PFC boost
stages because it combines the reduced peak currents of
CCM operation with the zero current switching of DCM
operation. The operation and waveforms in a PFC boost
converter are illustrated in Figure 27.
Diode Bridge
If next cycle does not start
then V
out
(V
− V
out
out
drain
in
− V
− V
)/L slope.
in
rings towards V
The power switch is OFF
in
) and the inductor current linearly decays
+
−
)/L
+
V
Bulk
Storage
Capacitor
in
+
Critical Conduction Mode:
Next current cycle starts
when the core is reset.
V
in
in
L
Converter
V
drain
I
L
+
Load
V
out