NCP1351ADAPGEVB ON Semiconductor, NCP1351ADAPGEVB Datasheet

NCP1351ADAPGEVB

Manufacturer Part Number

NCP1351ADAPGEVB

Description

EVAL BOARD FOR NCP1351ADAPG

Manufacturer

ON Semiconductor

Datasheets

1.NCP1351APG.pdf (27 pages)

2.NCP1351ADAPGEVB.pdf (10 pages)

3.NCP1351ADAPGEVB.pdf (1 pages)

Specifications of NCP1351ADAPGEVB

Design Resources

NCP1351 Adapter EVB BOM NCP1351ADAPGEVB Gerber Files NCP1351 Adapter EVB Schematic

Main Purpose

AC/DC, Primary Side

Outputs And Type

1, Isolated

Power - Output

57W

Voltage - Output

19V

Current - Output

Voltage - Input

90 ~ 265VAC

Regulator Topology

Flyback

Frequency - Switching

65kHz

Board Type

Fully Populated

Utilized Ic / Part

NCP1351

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Other names

NCP1351ADAPGEVBOS

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AND8263/D

NCP1351 Evaluation Board,

a 19 V − 3 A Adapter

Prepared by: Nicolas Cyr, Christophe Basso

ON Semiconductor

The NCP1351 at a Glance

implementing a fixed peak current mode control (hence the

more appropriate term “quasi−fixed” t

modulates the off time duration according to the output

power demand. In high power conditions, the switching

frequency increases until a maximum is hit. This upper limit

depends on an external capacitor selected by the designer. In

light load conditions, the off time expands and the NCP1351

operates at a lower frequency. As the frequency reduces, the

contribution of all frequency−dependent losses accordingly

goes down (driver current, drain capacitive losses, switching

losses), naturally improving the efficiency at various load

levels.

the frequency will certainly force the converter to operate

into the audible region. To prevent the transformer

mechanical resonance, the NCP1351 gradually reduces –

compresses – the peak current setpoint as the load becomes

lighter. When the current reaches 30% of the nominal value,

the compression stops and the off duration keeps expanding

towards low frequencies.

offers an excellent solution for designers looking for low

standby power converters. Also, compared to the skip−cycle

method, the smooth off time expansion does not bring

additional ripple in no−load conditions: the output voltage

remains quiet.

of operation improves the EMI signature since the switching

frequency varies with the natural bulk ripple voltage.

proprietary circuitry, the NCP1351 startup section does not

consumme more than 10 mA during the startup sequence.

The designer can thus easily combine startup time and

standby consumption.

designer knows the pain of building converters where a

precise over current limit must be obtained. When the fault

detection relies on the auxiliary V

increases. Here, the NCP1351 observes the lack of feedback

current starts a timer to countdown. At the end of its charge,

October, 2006 − Rev. 1

Fixed

Peak Current Compression at Light Loads: Reducing

Low Standby−power: the frequency reduction technique

Natural Frequency Dithering: the quasi−fixed t

Extremely Low Start−up Current: built on a

Overload Protection Based on Fault Timer: every

variable

off

current−mode

, the pain even

), the NCP1351

control:

mode

the timer either triggers an auto−recovery sequence

(auto−restart, B version) or permanently latches−off (A).

externally trigger the latch to build additional protections

such as over−voltage (OVP) or over−temperature (OTP).

The Schematic

Input voltage: 90 – 265 Vac

Output voltage: 19 V @ 3 A

Over voltage protection

Over power protection

Auto−recovery short−circuit protection

switching frequency has become an industry standard for the

vast majority of power supplies connected on the mains.

With the NCP1351, selecting a C

the upper limit to 65 kHz. As a result, when the controller

detects a need for a higher frequency, implying an overload

condition, it will start to charge the timer capacitor: if the

overload disappears, the timer capacitor goes back to zero.

If the fault remains, the timer capacitor voltage reaches 5 V

and starts the auto−recovery process.

recommendations described in the NCP1351 data−sheet.

We came−up to the following values:

from the ON Semiconductor website which also gives

transformer parameters. The core is a PQ26x25 made of a

3F3 material and has been manufactured by Delta

Electronics (reference 86H−6232). The leakage inductance

is kept around 1%, leading to a good efficiency and reduced

losses in no−load conditions. The schematic appears on

Figure 2. The converter operates in CCM with a 40%

duty−cycle at low mains and stays CCM at high line. Despite

the frequency variation, it is possible to evaluate the input

voltage point at which the converter leaves CCM:

Latch Fault Input: a dedicated input lets the designer

The design must fullfil the following specifications:

Offering a good EMI signature, the 65 kHz maximum

The transformer has been derived using the design

It is also possible to use the Excel

= 770 mH

aux

= 1:0.25

= 1:0.18

APPLICATION NOTE

http://onsemi.com

capacitor of 270 pF fixes

Publication Order Number:

spreadsheet available

AND8263/D

Related parts for NCP1351ADAPGEVB

NCP1351ADAPGEVB Summary of contents

Page 1

... It is also possible to use the Excel from the ON Semiconductor website which also gives transformer parameters. The core is a PQ26x25 made of a 3F3 material and has been manufactured by Delta Electronics (reference 86H−6232). The leakage inductance is kept around 1%, leading to a good efficiency and reduced losses in no− ...

Page 2

V in, crit + I peak V out h * 2NP out Where the selected peak current in the inductor peak V , the output voltage out η, the converter efficiency P , the delivered power out N, ...

Page 3

The overvoltage protection uses zener diode (D connected to the auxiliary V . When the voltage on this rail CC exceeds 15 V plus the NCP1351 5 V latch trip point (total is thus 20 V), the ...

Page 4

OUT 0.5 Output Power 0.5 W No−load Power No−load Overpower Protection Level OUT Overpower Start−up Time OUT Start−up Duration On the above arrays, we can see ...

Page 5

pin8 pin8 Figure 7. Startup Sequence to Test the Margin on the 100 ms Timer Vac the above picture, a short−circuit has been made at the highest line ...

Page 6

Figure 10. The Drain−source Waveform at Different Output Currents ( and 1 A). The Input Voltage is 230 Vac Figure 11. Short−circuit on the Optocoupler LED The output voltage increases and then the controller ...

Page 7

V V out out Figure 12. Load Step from 0 with Slew−rate from a 90 Vac V V out out Figure 13. Load Step from 0 with ...

Page 8

... Panasonic 5% SMD 0805 PHYCOMP 5% SOT23 ON Semiconductor 0% axial ON Semiconductor 0% axial ON Semiconductor 0% TO220 ON Semiconductor 0% axial Semiconductor 0% SOD−123 ON Semiconductor 6.2 °C/W 0% radial 2% TO92 ON Semiconductor 0% radial Multicomp 230 Vac/ 0% radial 2/” 0% rad5.08mm Weidmuller 0% radial Schaffner 0% radial Wurth Elektronik 0% TO220 0% TO92 ON Semiconductor 1% SOT23 5% axial 2% SMD 1206 ...

Page 9

... NC SMD 1206 2% SMD 1206 2% SMD 1206 2% SMD 1206 2% SMD 1206 2% SMD 1206 2% SMD 1206 FIX 4 H radial sfh6156/ SMD SO−8 ON Semiconductor http://onsemi.com 9 Sub- Manufacturer Part stitution Number Allowed yes Welwyn WCR12063K92% yes Welwyn WCR120610R2% yes Welwyn WCR12061K52% yes Welwyn WCR120647K2% ...

Page 10

... Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada Fax: 303− ...

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