NCP1631DR2G ON Semiconductor, NCP1631DR2G Datasheet - Page 13

• 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

Current Sense
proportional to total input current, i.e., the current drawn by
the two interleaved branches (I
Figure 13, a current sense resistor (R
inserted within the return path to generate a negative
voltage (V
detect when I
do so, the circuit incorporates an operational amplifier that
sources the current necessary to maintain the CS pin
voltage null (refer to Figure 13). By inserting a resistor
R
that is sourced by the CS pin (I
Which leads to:
the coil current.
negative voltage that can be applied to the pin. This
protection is permanently active (even if the circuit off).
The clamp is designed to sustain 5 mA. It is recommended
OCP
The NCP1631 is designed to monitor a negative voltage
In other words, the pin 9 current (I
A negative clamp protects the circuit from the possible
between the CS pin and R
* [R
I
CS
CS
+
CS
) proportional to I
in
R
R
I
exceeds its maximum permissible level. To
COIL
OCP
CS
] ) [R
I
COIL
OCP
I
CS
in
CS
] + 0
. The circuit uses V
CS
) as follows:
(V
Figure 12. Zero Current Detection Timing Diagram
in
, we adjust the current
AUX
). As portrayed by
CS
) is proportional to
CS
is the Voltage Provided by the ZCD Winding)
) is practically
(eq. 10)
(eq. 11)
http://onsemi.com
CS
to
13
not to sink more than 5 mA from the CS pin for a proper
operation.
the in−rush current detection.
Over−Current Protection (OCP)
is detected and the on−time is decreased proportionally to
the difference between the sensed current I
210 mA OCP threshold.
in the negative input of the “V
OPAMP. (See Figure 7)
This current is injected each time the OCP signal is high.
The maximum coil current is:
In−rush Current Detection
capacitor is abruptly charged to the line voltage. The
charge current (named in−rush current) can be very huge
Two functions use I
If I
The on−time reduction is done by injecting a current I
When the PFC stage is plugged to the mains, the bulk
CS
I
I
neg
COIL(max)
exceeds I
+ 0.5(I
+
ILIM1
CS
R
R
* 210 m)
OCP
CS
CS
(210 mA typical), an over−current
: the over current protection and
I
ILIM1
TON
processing circuit”
IN
and the
(eq. 12)
(eq. 13)
neg