NCP1654BD133R2G datasheet(5/23 Pages) ONSEMI

Il numero della parte	NCP1654BD133R2G

Spiegazioni elettronici	Power Factor Controller for Compact and Robust, Continuous Conduction Mode Pre-Converters

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DETAILED PIN DESCRIPTIONS

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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