NCP1607BDR2G ON Semiconductor, NCP1607BDR2G Datasheet - Page 15

• 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

Overvoltage Protection
active PFC stages very slow systems. One consequence of
this is the risk of huge overshoots in abrupt transient phases
(startup, load steps, etc.). For reliable operation, it is
critical that some form of overvoltage protection (OVP)
effectively prevents the output voltage from rising too
high. The NCP1607 detects these excessive V
V
V
The low bandwidth of the feedback network makes
CC(off)
CC(on)
V
V
Figure 32. Startup Timing Diagram Showing the
REF
EAL
V
V
Natural Soft Start of the Control Pin
FB
CC
OUT
I
M
Control
Natural Soft Start
+
+
−
UVLO
Figure 33. Output Driver Stage and Pull Down Clamps
V
DDREG
OUT
http://onsemi.com
levels
V
V
DDGD
DD
V
CC
15
DRV IN
UVLO
uV
DD
OUTPUT DRIVER
of peak currents of Source 500 mA / Sink 800 mA. This
enables the controller to efficiently drive power MOSFETs
for medium power (up to 300 W) applications.
Additionally, the driver stage is equipped with both passive
and active pull down clamps (Figure 33). The clamps are
active when V
below the threshold voltage of a power MOSFET.
and disables the driver until the output voltage returns to
nominal levels. This keeps the output voltage within an
acceptable range. The limit is adjustable so that the
overvoltage level can be optimally set. The level must not
be so low that it is triggered by the 100 or 120 Hz ripple of
the output voltage, but it must be low enough so as not to
require a larger voltage rating of the output capacitor.
Figure 34 depicts the operation of the OVP circuitry.
The NCP1607 includes a powerful output driver capable
CC
is off and force the driver output to well
GND
DRV