NCP1605ADR2G ON Semiconductor, NCP1605ADR2G Datasheet - Page 6

• 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

PIN FUNCTION DESCRIPTION
Number
Pin
10
12
13
14
15
16
11
1
2
3
4
5
6
7
8
9
synchronization
PfcOK / REF5V
Current Sense
Current Sense
Brown−Out /
V
OVP / UVP
Oscillator /
Soft−Start
Feedback
Inhibition
CONTROL
STDWN
(Ramp)
Output
Name
STBY
Drive
GND
Input
V
NC
HV
Ct
CC
/
An external signal (typically, a portion of the feedback signal of the downstream converter or a filtered
portion of the SMPS drive pulses) should be applied to Pin 1. When the Pin 3 voltage goes below
300 mV, the circuit enters a burst mode operation where the bulk voltage varies between the regulation
voltage and 95.5% of this level.
Apply a portion of the averaged input voltage to detect brown−out conditions. If V
0.5 V, the circuit stops pulsing until V
Ground Pin 6 to disable the part.
The error amplifier output is available on this Pin. The capacitor connected between this pin and ground
adjusts the regulation loop bandwidth that is typically set below 20 Hz to achieve high Power Factor
ratios.
Pin 3 is grounded when the circuit is off so that when it starts operation, the power increases slowly
(soft−start).
This pin receives a portion of the pre−converter output voltage. This information is used for the
regulation and the “output low” detection (V
output voltage drops below 95.5% of the wished level.
This pin monitors a negative voltage proportional to the coil current. This signal is sensed to limit the
maximum coil current and detect the core reset (coil demagnetization).
This pin sources the Pin 5 current. Place a resistor between Pin 6 and ground to build the voltage
proportional to the coil current and detect the core reset. The impedance between Pin 6 and ground
should not exceed 3 times that of the Pin 5 to ground. You can further apply the voltage from an
auxiliary winding to improve the valley detection of the MOSFET drain source voltage.
The circuit controls the power switch on−time by comparing the Pin 7 ramp to an internal voltage
(“V
over the corresponding switching period).
Pin 7 sources a current proportional to the squared output voltage to allow the Follower Boost operation
(optional) where the PFC output voltage stabilizes at a level that varies linearly versus the ac line
amplitude. This technique reduces the difference between the output and input voltages, to optimize the
boost efficiency and minimize the size and cost of the PFC stage
Connect a capacitor or apply a synchronization signal to this pin to set the switching frequency. If the
coil current cycle is longer than the selected switching period, the circuit delays the next cycle until the
core is reset. Hence, the PFC stage can operate in CRM in the most stressful conditions.
Connect this pin to the pre−converter ground.
The high current capability of the totem pole gate drive (+0.5/−0.8 A) makes it suitable to effectively
drive high gate charge power MOSFETs.
This pin is the positive supply of the IC. The circuit starts to operate when V
for NCP1605A) and turns off when V
range is 10 V up to 20 V.
The Pin 12 voltage is high (5 V) when the PFC stage is in a normal, steady state situation and low
otherwise. This signal serves to “inform” the downstream converter that the PFC stage is ready and
that hence, it can start operation.
Apply a voltage higher than 2.5 V on Pin 13 to permanently shutdown the circuit. This pin can be used
to monitor the voltage across a thermistor in order to protect the application from an excessive heating
and/or to detect an overvoltage condition.
To resume operation, it is necessary to decrease the circuit V
instance, unplugging the PFC stage and replugging it after V
The circuit turns off when V
voltage exceeds 2.5 V (OVP).
Creepage distance.
Connect Pin 16 to the bulk capacitor. The internal startup current source placed between Pin 16 and the
V
CC
ton
terminal, charges the V
”) derived from the regulation block and the sensed “dcycle” (relative duration of the current cycle
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Pin14
CC
capacitor at startup.
goes below 480 mV (UVP) and disables the drive as long as the pin
6
CC
Pin2
goes below 9 V (typical values). After startup, the operating
exceeds 1 V (0.5 V hysteresis).
OUT
Function
L) that drastically speed up the loop response when the
CC
CC
is discharged.
below V
CC
RST (4 V typically) by for
CC
exceeds 15 V (10.5 V
Pin2
is lower than