NCP1654BD133R2G datasheet(12/23 Pages) ONSEMI

Part #	NCP1654BD133R2G

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

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP1654

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Detailed Operating Description

Introduction

The NCP1654 is a PFC driver designed to operate in

fixed frequency, continuous conduction mode. The fixed

frequency operation eases the compliance with EMI

standard and the limitation of the possible radiated noise

that may pollute surrounding systems. In addition,

continuous conduction operation reduces the application

di/dt and their resulting interference. More generally, the

NCP1654 is an ideal candidate in systems where

cost−effectiveness, reliability and high power factor are the

key parameters. It incorporates all the necessary features to

build a compact and rugged PFC stage:

• Compactness and Flexibility: housed in a SO8

package, the NCP1654 requires a minimum of

external components. In particular, the circuit scheme

simplifies the PFC stage design and eliminates the

need for any input voltage sensing. In addition, the

circuit offers some functions like the Brown−Out or

the true power limiting that enable the optimizations

of the PFC design,

• Low Consumption and Shutdown Capability: the

NCP1654 is optimized to exhibit consumption as

small as possible in all operation modes. The

consumed current is particularly reduced during the

start−up phase and in shutdown mode so that the PFC

stage power losses are extremely minimized when the

circuit is disabled. This feature helps meet the more

stringent stand−by low power specifications. Just

ground the Feed−back pin to force the NCP1654 in

shutdown mode,

• Safety Protections: the NCP1654 permanently monitors

the output voltage, the coil current and the die

temperature to protect the system from possible

over−stresses. Integrated protections (Overvoltage

protection, coil current limitation, thermal shutdown...)

make the PFC stage extremely robust and reliable:

− Maximum Current Limit: the circuit permanently

senses the coil current and immediately turns off the

power switch if it is higher than the set current limit.

The NCP1654 also prevents any turn on of the

power switch as long as the coil current is not below

its maximum permissible level. This feature protects

the MOSFET from possible excessive stress that

could result from the switching of a current higher

than the one the power switch is dimensioned for. In

particular, this scheme effectively protects the PFC

stage during the start−up phase when large in−rush

currents charge the output capacitor.

− Undervoltage Protection for Open Loop Protection

or Shut−down: the circuit detects when the

feed−back voltage goes below than about 8% of the

regulation level. In this case, the circuit turns off and

its consumption drops to a very low value. This

feature protects the PFC stage from starting

operation in case of low AC line conditions or in

case of a failure in the feed−back network (i.e. bad

connection).

− Fast Transient Response: given the low bandwidth

of the regulation block, the output voltage of PFC

stages may exhibit excessive over or under−shoots

because of abrupt load or input voltage variations

(e.g. at start up). If the output voltage is too far from

the regulation level:

Overvoltage Protection: NCP1654 turns off the

power switch as soon as Vout exceeds the OVP

threshold (105% of the regulation level). Hence

a cost & size effective bulk capacitor of lower

voltage rating is suitable for this application,

Dynamic Response Enhancer:

NCP1654

drastically speeds up the regulation loop by its

internal 200

mA enhanced current source when the

output voltage is below 95% of its regulation level.

− Brown−Out Detection: the circuit detects low AC

line conditions and disables the PFC stage in this

case. This protection mainly protects the power

switch from the excessive stress that could damage it

in such conditions,

− Over−Power Limitation: the NCP1654 computes the

maximum permissible current in dependence of the

average input voltage measured by the brown−out

block. It is the second OCP with a threshold that is

line dependent. When the circuit detects an

excessive power transfer, it resets the driver output

immediately,

− Thermal Shutdown: an internal thermal circuitry

disables the circuit gate drive and then keeps the

power switch off when the junction temperature

exceeds 150

°C typically. The circuit resumes

operation once the temperature drops below about

120

°C (30°C hysteresis),

− Soft Start: Vcontrol is pulled low brown−out detection

activates, or Undervoltage protection activates, and

no drive is provided.

At start up, the “200

mA enhanced current source” is

disabled. So there is only 28

mA to charge the

compensation components, and makes Vcontrol raise

gradually. This is to obtain a slow increasing duty

cycle and hence reduce the voltage and current

stress on the MOSFET. Hence it provides a soft−start

feature.

• Output Stage Totem Pole: the NCP1654 incorporates

a

±1.5A gate driver to efficiently drive TO220 or

TO247 power MOSFETs.

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NCP1654BD133R2G Datasheet(PDF) 12 Page - ON Semiconductor

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