NCP1608_10 datasheet(17/24 Pages) ONSEMI

Part #	NCP1608

Description	Critical Conduction Mode PFC Controller Utilizing a Transconductance Error Amplifier

Download	24 Pages

Scroll/Zoom	100%

Manufacturer	ONSEMI [ON Semiconductor]

Direct Link	http://www.onsemi.com

Logo

17 / 24 page

NCP1608

http://onsemi.com

17

Figure 37. Ct Pin Noise Induced On Time

Reduction and Pulse Skipping

Noise Induced Voltage Spike

DRV Remains Off

DRV

is Not Exceeded

0 V

ton

tstart

ton(loop)

VCL(NEG)

VZCD(TRIG)

VZCD

VZCD(ARM)

VCt(off)

VCt

VControl

Ct(offset)

Low VControl Voltage

Low VCt(off) Voltage

VControl − Ct(offset)

The wide control range of the NCP1608 increases

VControl and VCt(off) in comparison to devices with less

control range. Figure 38 compares VCt(off) of the NCP1608

to a device with a 3 V control range for an application with

the following parameters:

Pout = 250 W

L = 200

mH

h = 92%

VacLL = 85 Vac

VacHL = 265 Vac

Figure 38 shows that VCt(off) of the NCP1608 is 50%

larger than the 3 V control range device. The 50% increase

enables the NCP1608 to prevent inadvertent skipping at

high input voltages and high output power.

Pout, OUTPUT POWER (W)

0

0.05

0.10

0.15

0.20

0.25

0.30

0.35

0.40

0.45

0.50

0.55

25

75

125

175

225

275

Figure 38. Comparison of Ct Charging Threshold

vs. Output Power

NCP1608

Vin = 265 Vac

3 V Control

Range

Startup

Generally, a resistor connected between the rectified ac

line and VCC charges the VCC capacitor to VCC(on). The low

startup current consumption (< 35

mA) enables minimized

standby power dissipation and reduced startup durations.

When VCC exceeds VCC(on), the internal references and

logic of the NCP1608 are enabled. The controller includes

an undervoltage lockout (UVLO) feature that ensures that

the NCP1608 is enabled until VCC decreases to less than

VCC(off). This hysteresis ensures sufficient time for the

auxiliary winding to supply VCC (Figure 39).

Figure 39. Typical VCC Startup Waveform

VCC

VCC(on)

VCC(off)

When the PFC pre-converter is loaded by a switch−mode

power supply (SMPS), it is generally preferable for the

SMPS controller to startup first. The SMPS then supplies

the NCP1608 VCC. Advanced controllers, such as the

NCP1230 or NCP1381, control the enabling of the PFC

stage (see Figure 40) and achieve optimal system

performance. This sequence eliminates the startup resistors

and improves the standby power dissipation of the system.

Similar Part No. - NCP1608_10

Manufacturer	Part #	Datasheet	Description
ON Semiconductor	NCP1608	229Kb / 24P	Critical Conduction Mode PFC Controller Utilizing a Transconductance Error Amplifier July, 2015 ??Rev. 5

More results

Similar Description - NCP1608_10

Manufacturer	Part #	Datasheet	Description
Fairchild Semiconductor	FAN7529	1Mb / 20P	Critical Conduction Mode PFC Controller
	FAN7529	1Mb / 20P	Critical Conduction Mode PFC Controller
	FAN7530	1Mb / 20P	Critical Conduction Mode PFC Controller
ON Semiconductor	NCP1608	251Kb / 24P	Critical Conduction Mode PFC Controller Utilizing OTA April, 2009 ??Rev. 0
Fairchild Semiconductor	AN-6961	434Kb / 8P	Critical Conduction Mode PFC Controller
	FAN7930B	944Kb / 22P	Critical Conduction Mode PFC Controller
	FAN7930C	916Kb / 22P	Critical Conduction Mode PFC Controller
ON Semiconductor	NCP1608	229Kb / 24P	Critical Conduction Mode PFC Controller Utilizing a Transconductance Error Amplifier July, 2015 ??Rev. 5
	NCP1608BOOSTGEVB	229Kb / 24P	Critical Conduction Mode PFC Controller Utilizing a Transconductance Error Amplifier July, 2015 ??Rev. 5
	FAN7930B	1Mb / 22P	Critical Conduction Mode PFC Controller September-2017, Rev. 2

More results

NCP1608 Datasheet(PDF) 17 Page - ON Semiconductor

NCP1608 Datasheet(HTML) 17 Page - ON Semiconductor

Similar Part No. - NCP1608_10

Similar Description - NCP1608_10

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