NCP1605ADR2G ON Semiconductor, NCP1605ADR2G Datasheet - Page 24

• Manufacturer Part Number: NCP1605ADR2G
• Description: IC PFC CONTROLLER CCM/DCM 16SOIC
• Manufacturer: ON Semiconductor

Specifications of NCP1605ADR2G

• Mode: Continuous Conduction (CCM), Discontinuous Conduction (DCM)
• Frequency - Switching: 250kHz
• Current - Startup: 12mA
• Voltage - Supply: 10 V ~ 20 V
• Operating Temperature: 0°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Switching Frequency: 250 KHz
• Maximum Power Dissipation: 550 mW
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

− Latched off of the circuit (when the “STDWN” pin,
voltage is properly and safely regulated. “pfcOK/REF5V”
should be used to allow operation of the downstream
converter.
Standby Management
when the power demand drops below a given level. This is
absorption of the line current necessary for matching the load
power demand. When the voltage applied to Pin 1 goes below
300 mV:
•
•
•
And “pfcOK/REF5V” is high when the PFC output
The NCP1605(A) automatically skips switching cycles
In normal operation, the circuit controls the continuous
The output pulses are blanked and Pin 3
(“V
The output of the PFC stage being not fed any more, it
drops. When the output voltage goes below 95.5% of
the regulation level, the circuit resumes operation until
“FLAG1” becomes low (what means that the output
voltage has exceeded the regulation level).
At that moment, if V
skipping phase starts.
V
Pin13
CONTROL
Standby Input
, exceeds 2.5 V).
Voltage
”) is grounded.
NCP1605
Pin1
1
2
3
4 13
5
6
7
8
16
15
14
12
10
11
Rectified
AC line
9
is still below 300 mV, a new
C
V
+
CC
Figure 63. Signal for Standby Detection
PFC stage
http://onsemi.com
downstream converter
Feed−back of the
24
+
accomplished by monitoring the Pin 1 voltage that must
receive a voltage below 300 mV in light load conditions.
Practically, a portion of the feedback signal of the
downstream converter (or some other signal able to indicate
that the power demand is low) should be applied to Pin 1.
output with a small amount of power, the circuit operates
from time to time at a higher power level. As an example
and to make it simple, instead of continuously supplying
1% of P
P
cycle mode, also named controlled burst operation. This
burst operation is much more efficient compared to a
continuous power flow as it drastically reduces the number
of pulsations and therefore the switching losses associated
to them.
MAX
In other words, instead of continuously providing the
for 10% of the time. The IC enters the so−called skip
MAX
, the circuit can provide the load with 10% of
controller
downstream converter
SMPS