NCP1650D Ver la hoja de datos (PDF) - ON Semiconductor

Número de pieza

componentes Descripción

Fabricante

NCP1650D

Power Factor Controller

ON Semiconductor 

NCP1650

PIN FUNCTION DESCRIPTION

Pin No.

Function

Description

1

VCC

Provides power to the device. This pin is monitored for undervoltage and the unit will not operate

if the VCC voltage is not within the UVLO range.

2

Vref

6.5 volt regulated reference output. This reference voltage is disabled when the chip is in the

shutdown mode.

3

AC

Provides pole for the ac Reference Amplifier. This amplifier compares the sum of the ac input

Compensation voltage and the low frequency component of the input current to the reference signal. The

response must be slow enough to filter out most of the high frequency content of the current

signal that is injected from the current sense amplifier, but fast enough to cause minimal

distortion to the line frequency information.

4

AC REF

This pin accommodates a capacitor to ground for filtering and stability of the ac error amplifier.

The ac error amplifier is a transconductance amplifier and is terminated with an internal high

impedance load.

5

AC Input

The rectified input ac rectified sinewave is connected to this pin. This information is used for the

reference comparator, maximum power circuit, and the average current compensation circuit.

6

Feedback/

The DC output of the converter is reduced through a resistive voltage divider, to a level of 4.0

Shutdown

volts, and connected to this pin to provide feedback for the voltage regulation loop. This pin also

provides an input undervoltage lockout feature by disabling the chip until the divided output

voltage exceeds 0.75 volts. It can also be used as a shutdown pin by shorting it to ground with

an open collector comparator, or a small signal transistor.

7

Loop

A compensation network for the voltage regulation loop, is connected to the output of the voltage

Compensation error amplifier at this pin.

8

PCOMP

A compensation network for the maximum power loop, is connected to the output of the power

error amplifier at this pin.

9

PMAX

This pin allows the output of the power multiplier to be scaled for the desired maximum power

limit level. This multiplier is a proprietary switching design and requires both a resistor and

capacitor to ground. The value of this resistor is determined in conjunction with R10.

10

Iavg

An external resistor with a low temperature coefficient is connected from this terminal to ground,

to set and stabilize the gain of the Current Sense Amplifier output that drives the Power Multiplier

and the ac error amplifier. This resistor should be of the same type as that used on pin 9. The

value of this resistor will determine the maximum average current that the unit will allow before

limiting will occur.

11

Iavgfltr

A capacitor connected to this pin filters the high frequency component from the instantaneous

current waveform, to create a waveform that resembles the average line current.

12

IS−

Negative current sense input. Designed to connect to the negative side of the current shunt.

13

Ramp

This pin biases the ramp compensation circuit, to adjust the amount of compensation that is

Compensation added to the instantaneous current and ac error amp outputs.

14

CT

Timing capacitor for the internal oscillator. This capacitor adjusts the oscillator frequency.

15

Ground

Ground reference for the circuit.

16

Output

Drive output for power FET or IGBT. Capable of driving small devices, or can be connected to an

external driver for larger transistors.

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