NST45011 [ONSEMI]

IC SWITCHING CONTROLLER, Switching Regulator or Controller;


型号：	NST45011
厂家：	ONSEMI
描述：	IC SWITCHING CONTROLLER, Switching Regulator or Controller 开关
文件：	总10页 (文件大小：196K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

DN05038/D

Design Note – DN05038/D

Non-Isolated, 8 Watt Dual Output, Off-line Power Supply

Device

Application

Input Voltage Output Power

Topology

I/O Isolation

NCP1075

NST45011

White Goods,

Industrial Equipment

Non-Isolated

No isolation from

180 to 270 Vac

8 Watts Nominal

Flyback

mains

Other Specification

Output 1

Output 2

8.5 Vdc +/- 5%

200 mV p/p

200 mA

Output 3

N/A

Output 4

N/A

5.0 Vdc +/- 2%

200 mV p/p

1 A

Output Voltage

N/A

Ripple

Nominal Current

Max Current

Min Current

1.25 A

300 mA

N/A

PFC (Yes/No)

Efficiency

Inrush Limiting / Fuse

Operating Temp. Range

76% at 8 watts output

Yes – limiting resistor and fuse

0 – 50 C

Convection

Cooling Method /

Supply Orientation

68 mW @ 230 Vac

No Load Standby Power

Optional high regulation sense circuit using NCP431

Others

circuitry. Other 2^ndchannel voltages are possible by

changing the turns of the slave secondary winding.

Circuit Description

This Design Note features an 8 watt, off-line, dual output,

flyback power supply intended for powering white goods or

industrial equipment circuitry which does not require output

isolation from the AC mains. The flyback converter is

designed around ON Semiconductor’s 100 kHz NCP1075

monolithic switching controller. A simple voltage sensing

and feedback scheme utilizing a current mirror transistor

pair (Q1), and zener diode (Z1) is utilized for low cost yet

effective output regulation for most typical applications.

For situations requiring more precise regulation on the

primary 5 volt channel (<1%), an alternate circuit using a

NCP431 programmable zener as an error amplifier is

shown within the dotted box in the schematic.

Logic power (Vcc) for the control chip is derived via diode

D9 directly from the slave output. Since the control IC

needs a minimum of about 8 volts to maintain efficient

operation, Schottky D6 is provided as an optional logic Vcc

source instead of D9 in the event it is required that the

second output is somewhat less than 8 volts. At Vcc

voltages less than about 8 volts, the controller will operate

in DSS mode and there will be some degradation in overall

circuit efficiency.

Although this design is for European mains voltage, a

transformer design for a universal AC input version is

available on request. A 5V/12V transformer design is also

included in the information below.

This particular design example provides output voltages of

5V and 8.5V but these can be tailored to other voltages to

accommodate the specific requirements by appropriate

transformer turns ratio changes and alterations to voltage

setting zener Z1 and resistor R6.

Key Features

 Schottky diodes (D6, D7) on both outputs for high

efficiency

The regulation loop is closed around the 5 volt main output

while the 8.5 volt output is configured using a “slave”

secondary winding on the transformer. The slave

secondary is tightly coupled to the main 5V winding via

bifilar winding techniques which assures reasonable load

and cross regulation without requiring dedicated regulation

 Dual sensing options depending on desired regulation

accuracy

 Input EMI filter for conducted emission compliance

 Input fuse and inrush limiting resistor (R1)

 Good load and cross regulation on 8.5Vout due to

secondary winding technique on transformer

October 2012, Rev. 0

www.onsemi.com

DN05038/D

Schematic¹

BAT54

MMSD

4148A

VS2

+8.5V

L1A

C11

MBRS240

C10

1000uF

16V

1 mH

0.1uF

50V

D1-D4

MRA4007

X 4

68K

1/2W

VS1

+5V

C9A

C9B

1nF

1kV

R2A

3.3M

AC Input

0.1uF

"X"

0.1uF

"X"

L1B

1N4937

10uF

400V

R2B

3.3M

Com

1500uF, 6.3V

0.1uF

50V

MBRS240

1 mH

6.8 ohms

(wire wound)

Primary

Ground

Plane

NCP1075

(100 kHz)

100

Vtrim

10nF

MMSZ

5229B

(4.3V)

NST45011

0.1uF

22uF

25V

120

10K

NOTES:

1. Crossed schematic lines are not connected.

2. R4 value dependent on VS2 nominal output voltage.

3. R1 is optional inrush limiting resistor.

C12

0.1

4. U1 tab (pin 4) should have heatsinking clad pours and be

part of a ground plane area for best noise immunity.

5. Heavy lines indicate recommended ground plane areas.

6. L1A/L1B are Wurth 7447728102.

MMSZ

5223B

(2.7V)

NCP431

R10

10K

R11

4.7K

7. Z1 sets nominal 5Vout. R6 can trim Vout upward.

8. Dotted area is optional sense/error amp circuit. If selected

omit Q1, Z1, R5, and R6.

Optional Sense Amp

Non-Isolated, 8 Watt, Dual Output NCP1075 PSU

with Universal AC Input (Rev 7B)

October 2012, Rev. 0

www.onsemi.com

DN05038/D

MAGNETICS DESIGN DATA SHEET

Project / Customer: ON Semiconductor - NCP1014/1075, 8W dual output PSU

Part Description: 8 watt flyback transformer, 100kHz, 5V/9V outputs (Rev 5 - Euro version)

Schematic ID: T1

Wurth Electronics Part # 750313309 Rev 02

Core Type: EF16 (E16/8/5); 3C90 material or similar

Core Gap: Gap for 5.5 mH +/- 5% inductance across primary (pins 1 - 4)

Inductance: 5 to 6 mH when measuring from pin 1 to pin 4

Bobbin Type: 8 pin horizontal mount for EF16

Windings (in order):

Winding # / type

Turns / Material / Gauge / Insulation Data

Primary A (4 - 2)

78 turns of #38 mag wire wound over 1 layer.

Insulate with Mylar tape for at least 1kV breakdown.

5V/8.5V Secondaries (8,5 - 7,6)

7 turns of two pieces of #26 magnet wire (different

colors) spiral wound bifilar over one layer. Remove two

turns so winding terminating to pins 7/6 has only

5 turns. Triple Insulated wire can also be used if

desired. Self-leads to pins.

Primary B (2 - 1)

Same as primary A.

Varnish assembly

1 kV from primary to secondary - no agency primary/secondary insulation requirements

Hipot:

Lead Breakout / Pinout

Schematic

(Bottom View - facing pins)

Pri B

Pri A

5 turns

7 turns

(5Vout)

(8Vstack)

October 2012, Rev. 0

www.onsemi.com

DN05038/D

MAGNETICS DESIGN DATA SHEET

Project / Customer: ON Semiconductor - NCP1014/1075, 8W dual output PSU

Part Description: 8 watt flyback transformer, 100kHz, 5V/12V outputs (Rev 1 - Euro version)

Schematic ID: T1

Core Type: EF16 (E16/8/5); 3C90 material or similar

Core Gap: Gap for 5.5 mH +/- 5% inductance across primary (pins 1 - 4)

Inductance: 5 to 6 mH when measuring from pin 1 to pin 4

Bobbin Type: 8 pin horizontal mount for EF16

Windings (in order):

Winding # / type

Turns / Material / Gauge / Insulation Data

Primary A (4 - 2)

78 turns of #38 mag wire wound over 1 layer.

Insulate with Mylar tape for at least 1kV breakdown.

5V/12V Secondaries (8,5 - 7,6)

7 turns of two pieces of #26 magnet wire (different

colors) spiral wound bifilar over one layer. Add two

more turns so the winding terminating to pins 7/6 has

9 turns total (12V stack). Triple Insulated wire can also

be used if desired. Self-leads to pins.

Primary B (2 - 1)

Same as primary A.

Varnish assembly

1 kV from primary to secondary - no agency primary/secondary insulation requirements

Hipot:

Lead Breakout / Pinout

Schematic

(Bottom View - facing pins)

Pri B

Pri A

9 turns

7 turns

(5Vout)

(12Vstack)

October 2012, Rev. 0

www.onsemi.com

DN05038/D

Efficiency versus Pout (5V:8.5V = 2:1 Loading Ratio Respectively)

8.5 Vout Load Regulation (5 Vout set to 1A Load)

October 2012, Rev. 0

www.onsemi.com

DN05038/D

Cross Regulation (8.5Vout loaded at 100mA)

Output Ripple – 5 Vout at 1 Amp

Output Ripple – 8.5 Vout at 350 mA

October 2012, Rev. 0

www.onsemi.com

DN05038/D

Mosfet Drain Voltage at 150 Vac Input and 8 Watt Load

Mosfet Drain Voltage at 265 Vac Input and 8 Watt Load

Mosfet Drain Voltage at 260 Vac Input and 1 Watt Load

October 2012, Rev. 0

www.onsemi.com

DN05038/D

Conducted EMI Scan with 8 Watt Load (EN55022, Level B; Average)

dBuV

1075 Dual

240Vac 60Hz Input

EN 55022; Class B Conducted, Average

Average

-10

-20

(Start = 0.15, Stop = 30.00) MHz

10/15/2012 11:24:00 AM

PC Board Layout / Photo

October 2012, Rev. 0

www.onsemi.com

DN05038/D

Substitution Lead

Designator Qty Description

Value

Tolerance

Footprint

Manufacturer

Manufacturer Part Number

Allowed

Free Comments

D7, D8

D1, 2, 3, 4

Schottky diode

Diode - 60 Hz,

Diode - fast recov

Schottky diode

Signal diode

Zener diode

Dual NPN matched xstr

Programmable zener

Switcher IC - NCP1075

3A, 40V

1A, 800V

1A, 600V

200mA, 30V

100mA, 100V

4.3V, 500 mA

2.7V, 500 mA

45V, 100 mA

2.5V

SMB

SMA

ON Semi

MBRS240L (or MBRS2040L)

MRA4007

axial lead

SOD-123

SOT-363

SOIC8 / SOT23

SOT223

1N4937

BAT54

MMSD4148A

MMSZ5229B

MMSZ5223B

NST45011

For 12Vout and higher

NCP431A

NCP1075ST100

100 kHz

C1, C2

C7, 8, 11

C12

C10

C9A, C9B

"X" cap, box type

Ceramic cap, disc

Ceramic cap, monolythic

Electrolytic cap

100nF, X2

1 nF, 1kV

1 nF, 50V

100nF, 50V

10uF, 400/450V

1000uF, 16V

22uF, 25V

LS = 15 mm

LS = 7.5 mm

Rifa, Wima

AVX, Murata

UCC, Panasonic

TBD

Yes

10%

1206

LS=7.5mm, D=16mm

LS=5 mm, D=12.5mm

LS=2.5mm, D=6.3mm

LS=5mm, D=12.5mm

Yes

1,500uF, 6.3V

Yes

12V version

R2A,R2B

R9, R10

R11

Resistor, 2W, Wire wound

Resistor, 0.5W, metal film

Resistor, 1/4W SMD

6.8 ohm, 2W

68K, 0.5W

3.3 Meg

120 ohms

2.0K

10K

100 ohms

1 Meg

4.7K

10%

LS=7.5mm, D=7mm

Axial lead; LS=12.5mm

SMD 1206

Ohmite, Dale

TBD

Yes

AVX, Vishay, Dale

SMD 1206

Yes

L1A/B

T1 (5/8.5Vout

Fuse, TR-5 style

Inductor (EMI choke)

Transformer

TR-5, LS=5mm

See Wurth Drawing

See Mag Drawing

LS = 0.2"

Minifuse

LS=5mm, D=8mm

Wurth Magnetics

DigiKey

Yes

1 mH, 500 mA

E20/10/6 core

7447728102

750313309 Rev 02

# 281-1435-ND

Screw Terminal

Yellow indicates parts for standard Vout sense scheme

Green indicates parts for alternate Vout sense scheme.

October 2012, Rev. 0

www.onsemi.com

DN05038/D

References:

NCP1075 data sheet: http://www.onsemi.com/pub_link/Collateral/NCP1072-D.PDF

NCP1075 Design Note: http://www.onsemi.com/pub_link/Collateral/DN05018-D.PDF

NCP1072 EVAL Board Documents:

http://www.onsemi.com/PowerSolutions/supportDoc.do?type=boards&rpn=NCP1072

Disclaimer: ON Semiconductor is providing this design note “AS IS” and does not assume any liability arising from its use; nor

does ON Semiconductor convey any license to its or any third party’s intellectual property rights. This document is provided only to

assist customers in evaluation of the referenced circuit implementation and the recipient assumes all liability and risk associated

with its use, including, but not limited to, compliance with all regulatory standards. ON Semiconductor may change any of its

products at any time, without notice.

Design note created by Frank Cathell, e-mail: f.cathell@onsemi.com

October 2012, Rev. 0

www.onsemi.com

NST45011 [ONSEMI]

相关型号：

NST45011MW6T1G

NST4617MX2T5G

NST489AMT1

NST489AMT1-D

NST489AMT1G

NST520

NST520

NST520R

NST520R

NST530

NST530

NST530R