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NCP1654 Datasheet(PDF) 5 Page - ON Semiconductor

Part # NCP1654
Description  Power Factor Controller for Compact and Robust, Continuous Conduction Mode Pre-Converters
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1654 Datasheet(HTML) 5 Page - ON Semiconductor

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NCP1654
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5
DETAILED PIN DESCRIPTIONS
Pin
Symbol
Name
Function
1
GND
Ground
2
Vin
Multiplier
Voltage
This pin provides a voltage VM for the PFC duty cycle modulation. The input impedance of the
PFC circuits is proportional to the resistor RM externally connected to this pin. The device op-
erates in average current mode if an external capacitor CM is connected to the pin. Otherwise,
it operates in peak current mode.
3
CS
Current Sense
Input
This pin sources a current ICS which is proportional to the inductor current IL. The sense cur-
rent ICS is for overcurrent protection (OCP), overpower limitation (OPL) and PFC duty cycle
modulation. When ICS goes above 200 mA, OCP is activated and the Drive Output is disabled.
4
VBO
Brown−Out / In
Connect a resistor network among the rectified input voltage, BO pin, and ground. And connect
a capacitor between BO pin and ground. BO pin detects a voltage signal proportional to the
average input voltage.
When VBO goes below VBOL, the circuit that detects too low input voltage conditions (brown−
out), turns off the output driver and keeps it in low state until VBO exceeds VBOH.
This signal which is proportional to the RMS input voltage Vac is also for overpower limitation
(OPL) and PFC duty cycle modulation.
5
Vcontrol
Control Voltage /
Soft−Start
The voltage of this pin Vcontrol directly controls the input impedance. This pin is connected to
external type−2 compensation components to limit the Vcontrol bandwidth typically below 20 Hz
to achieve near unity power factor.
The device provides no output when Vcontrol < Vcontrol(min). When it starts operation, the power
increases slowly (soft−start).
6
VFB
Feed−Back /
Shutdown
This pin receives a feedback signal VFB that is proportional to the PFC circuits output voltage.
This information is used for both the output regulation, the overvoltage protection (OVP), and
output undervoltage protection (UVP) to protect the system from damage at feedback abnor-
mal situation.
When VFB goes above 105% VREF, OVP is activated and the Drive Output is disabled.
When VFB goes below 8% VREF, the device enters a low−consumption shutdown mode.
7
VCC
Supply Voltage
This pin is the positive supply of the IC. The circuit typically starts to operate when VCC ex-
ceeds 10.5 V and turns off when VCC goes below 9 V. After start−up, the operating range is 9 V
up to 20 V.
8
DRV
Drive Output
The high current capability of the totem pole gate drive (±1.5 A) makes it suitable to effectively
drive high gate charge power MOSFET.


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