NCP1631DR2G datasheet(9/24 Pages) ONSEMI

Part #	NCP1631DR2G

Description	Interleaved, 2-Phase Power Factor Controller

Download	24 Pages

Scroll/Zoom	100%

Manufacturer	ONSEMI [ON Semiconductor]

Direct Link	http://www.onsemi.com

Logo

9 / 24 page

NCP1631

www.onsemi.com

9

Detailed Operating Description

The NCP1631 integrates a dual MOSFET driver for

interleaved, 2−phase PFC applications. It drives the two

branches in so−called Frequency Clamped Critical

conduction Mode (FCCrM) where each phase operates in

Critical conduction Mode (CrM) in the most stressful

conditions and in Discontinuous Conduction Mode (DCM)

otherwise, acting as a CrM controller with a frequency

clamp (given by the oscillator). According to the

conditions, the PFC stage actually jumps from DCM to

CrM (and vice versa) with no discontinuity in operation and

without degradation of the current shape.

Furthermore, the circuit incorporates protection features

for a rugged operation together with some special circuitry

to lower the power consumed by the PFC stage in no−load

conditions. More generally, the NCP1631 is ideal in

systems where cost−effectiveness, reliability, low stand−by

power and high power factor are the key parameters:

Fully Stable FCCrM and Out−Of−Phase Operation.

Unlike master/slave controllers, the NCP1631 utilizes an

interactive−phase approach where the two branches

operate independently. Hence, the two phases necessarily

operate

in FCCrM, preventing risks of undesired

dead−times or continuous conduction mode sequences. In

addition, the circuit makes them interact so that they run

out−of−phase.

The

NCP1631

unique

interleaving

technique substantially maintains the wished 180

° phase

shift between the 2 branches, in all conditions including

start−up, fault or transient sequences.

Optimized Efficiency Over The Full Power Range.

The NCP1631 optimizes the efficiency of your PFC

stage in the whole line/load range. Its clamp frequency is

a major contributor at nominal load. For medium and light

load, the clamp frequency linearly decays as a function of

the power to maintain high efficiency levels even in very

light load. The power threshold under which frequency

reduces is programmed by the resistor placed between pin

6 and ground. To prevent any risk of regulation loss at no

load, the circuit further skips cycles when the error

amplifier reaches its low clamp level.

Fast Line / Load Transient Compensation.

Characterized by the low bandwidth of their regulation

loop, PFC stages exhibit large over and under−shoots when

abrupt load or line transients occur (e.g. at start−up). The

NCP1631 dramatically narrows the output voltage range.

First, the controller dedicates one pin to set an accurate

Over−Voltage Protection level and interrupts the power

delivery as long as the output voltage exceeds this

threshold. Also, the NCP1631 dynamic response enhancer

drastically speeds−up the regulation loop when the output

voltage is 4.5% below its desired level. As a matter of fact,

a PFC stage provides the downstream converter with a very

narrow voltage range.

A “pfcOK” signal.

The circuit detects when the PFC stage is in steady state

or if on the contrary, it is in a start−up or fault condition. In

the first case, the “pfcOK” pin (pin15) is in high state and

low otherwise. This signal is to disable the downstream

converter unless the bulk capacitor is charged and no fault

is detected. Finally, the downstream converter can be

optimally designed for the narrow voltage provided by the

PFC stage in normal operation.

Safety Protections.

The NCP1631 permanently monitors the input and

output voltages, the input current and the die temperature

to protect the system from possible over−stresses and make

the PFC stage extremely robust and reliable. In addition to

the aforementioned OVP protection, one can list:

Maximum Current Limit: the circuit permanently

senses the total input current and prevents it

from exceeding the preset current limit, still

maintaining the out−of−phase operation.

In−rush Detection: the NCP1631 prevents the

power switches turn on for the large in−rush

currents sequence that occurs during the

start−up phase.

Under−Voltage Protection: this feature is mainly to

prevent operation in case of a failure in the

OVP monitoring network (e.g., bad

connection).

Brown−Out Detection: the circuit stops operating if

the line magnitude is too low to protect the

PFC stage from the excessive stress that could

damage it in such conditions.

Thermal Shutdown: the circuit stops pulsing when

its junction temperature exceeds 150

°C

typically and resumes operation once it drops

below about 100

°C (50°C hysteresis).

NCP1631 Operating Modes

The NCP1631 drives the two branches of the interleaved

in FCCrM where each phase operates in Critical

conduction Mode (CrM) in the most stressful conditions

and in Discontinuous Conduction Mode (DCM) otherwise,

acting as a CrM controller with a frequency clamp (given

by the oscillator). According to the conditions, the PFC

stage actually jumps from DCM to CrM (and vice versa)

with no discontinuity in operation and without degradation

of the current shape.

The circuit can also transition within an ac line cycle so

that:

• CrM reduces the current stress around the sinusoid top.

• DCM limits the frequency around the line zero

crossing.

This capability offers the best of each mode without the

drawbacks. The way the circuit modulates the MOSFET

on−time allows this facility.

Similar Part No. - NCP1631DR2G

Manufacturer	Part #	Datasheet	Description
ON Semiconductor	NCP1631DR2G	604Kb / 23P	Interleaved, 2-Phase Power Factor Controller August, 2009 ??Rev. 0

More results

Similar Description - NCP1631DR2G

Manufacturer	Part #	Datasheet	Description
ON Semiconductor	NCP1631	605Kb / 23P	Interleaved, 2-Phase Power Factor Controller April, 2010 ??Rev. 2
	NCP1632	392Kb / 25P	Interleaved, 2-Phase Power Factor Controller July, 2017 ??Rev. 0
	NCP1631	604Kb / 23P	Interleaved, 2-Phase Power Factor Controller August, 2009 ??Rev. 0
	NCP1632	301Kb / 25P	Interleaved, 2-Phase Power Factor Controller January, 2018 ??Rev. 3
STMicroelectronics	L6712	626Kb / 29P	TWO-PHASE INTERLEAVED DC/DC CONTROLLER
STMicroelectronics	L6712	1Mb / 27P	TWO-PHASE INTERLEAVED DC/DC CONTROLLER
Texas Instruments	UCC28070	403Kb / 27P	[Old version datasheet] Two-Phase Interleaved CCM PFC Controller
Fairchild Semiconductor	FPAM50LH60	1Mb / 11P	Smart Power Module for 2-phase Interleaved PFC
ON Semiconductor	FPAM30LH60	538Kb / 13P	PFC SPM 2 Series for 2-Phase Interleaved PFC July 2016 Rev. 1.5
ON Semiconductor	FPAM50LH60	614Kb / 13P	PFC SPM 2 Series for 2-Phase Interleaved PFC June 2015 Rev. 1.4

More results

NCP1631DR2G Datasheet(PDF) 9 Page - ON Semiconductor

NCP1631DR2G Datasheet(HTML) 9 Page - ON Semiconductor

Similar Part No. - NCP1631DR2G

Similar Description - NCP1631DR2G

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

Datasheet Download

Link URL