FAN6755WMY_技术文档

ON Semiconductor

Is Now

To learn more about onsemi™, please visit our website at

www.onsemi.com

onsemi andꢀꢀꢀꢀꢀꢀꢀand other names, marks, and brands are registered and/or common law trademarks of Semiconductor Components Industries, LLC dba “onsemi” or its affiliates and/or

subsidiaries in the United States and/or other countries. onsemi owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of onsemi

product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. onsemi reserves the right to make changes at any time to any products or information herein, without

notice. The information herein is provided “as-is” and onsemi makes no warranty, representation or guarantee regarding the accuracy of the information, product features, availability, functionality,

or suitability of its products for any particular purpose, nor does onsemi assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all

liability, including without limitation special, consequential or incidental damages. Buyer is responsible for its products and applications using onsemi products, including compliance with all laws,

regulations and safety requirements or standards, regardless of any support or applications information provided by onsemi. “Typical” parameters which may be provided in onsemi data sheets and/

or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application

by customer’s technical experts. onsemi does not convey any license under any of its intellectual property rights nor the rights of others. onsemi products are not designed, intended, or authorized

for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for

implantation in the human body. Should Buyer purchase or use onsemi products for any such unintended or unauthorized application, Buyer shall indemnify and holdonsemi and its officers, employees,

subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death

associated with such unintended or unauthorized use, even if such claim alleges that onsemi was negligent regarding the design or manufacture of the part. onsemi is an Equal Opportunity/Affirmative

Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. Other names and brands may be claimed as the property of others.

Is Now Part of

To learn more about ON Semiconductor, please visit our website at

www.onsemi.com

Please note: As part of the Fairchild Semiconductor integration, some of the Fairchild orderable part numbers

will need to change in order to meet ON Semiconductor’s system requirements. Since the ON Semiconductor

product management systems do not have the ability to manage part nomenclature that utilizes an underscore

(_), the underscore (_) in the Fairchild part numbers will be changed to a dash (-). This document may contain

device numbers with an underscore (_). Please check the ON Semiconductor website to verify the updated

device numbers. The most current and up-to-date ordering information can be found at www.onsemi.com. Please

email any questions regarding the system integration to Fairchild_questions@onsemi.com.

ON Semiconductor and the ON Semiconductor logo are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number

of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. ON Semiconductor reserves the right

to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability

arising out of the application or use of any product or circuit, and speciﬁcally disclaims any and all liability, including without limitation special, consequential or incidental damages. Buyer is responsible for its products and applications using ON

Semiconductor products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON

Semiconductor data sheets and/or speciﬁcations can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s

technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA

Class 3 medical devices or medical devices with a same or similar classiﬁcation in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended

or unauthorized application, Buyer shall indemnify and hold ON Semiconductor and its ofﬁcers, employees, subsidiaries, afﬁliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out

of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor

is an Equal Opportunity/Afﬁrmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.

FAN6755W / FAN6755UW

mWSaver^™PWM Controller

Features

Description

This highly integrated PWM controller provides several

features to enhance the performance of flyback

converters.

.

mWSaver^™Technology Provides Industry’s Best-

in-Class Standby Power

<100 mW at 25-mW Load for LCDM Adaptor

Internal High-Voltage JFET Startup

To minimize standby power consumption, a proprietary

adaptive green-mode function reduces switching

frequency at light-load condition. To avoid acoustic-

noise problems, the minimum PWM frequency is set

above 23 kHz. This green-mode function enables the

power supply to meet international power conservation

requirements, such as Energy Star^®. With the internal

high-voltage startup circuitry, the power loss caused by

bleeding resistors is also eliminated. To further reduce

power consumption, FAN6755W/UW uses the BiCMOS

process, which allows an operating current of only

2 mA. The standby power consumption can be under

100 mW for most of LCD monitor power supply designs.

Low Operating Current: Under 2 mA

Adaptively Decrease PWM Frequency to

23 kHz at Light-Load Condition for Better

Efficiency

Feedback Impedance Switching During

Minimum Load or No Load

.

Proprietary Asynchronous Frequency Hopping

Technique that Reduces EMI

Fixed PWM Frequency: 65 kHz (FAN6755W),

130 kHz (FAN6755UW)

FAN6755W/UW

integrates

a

frequency-hopping

.

Internal Leading-Edge Blanking

function that reduces EMI emission of a power supply

with minimum line filters. The built-in synchronized

slope compensation achieves a stable peak-current-

mode control and improves noise immunity. The

proprietary line compensation ensures constant output

power limit over a wide AC input voltage range from

Built-in Synchronized Slope Compensation

Auto-Restart Protection: Feedback Open-Loop

Protection (OLP), V_DDOver-Voltage Protection

(OVP), Over-Temperature Protection (OTP), and

Line Over-Voltage Protection

90 V_ACto 264 V_AC

.

Soft Gate Drive with Clamped Output Voltage: 18 V

V_DDUnder-Voltage Lockout (UVLO)

FAN6755W/UW provides many protection functions.

The internal feedback open-loop protection circuit

protects the power supply from open-feedback-loop

condition or output-short condition. It also has line

under-voltage protection (brownout protection) and

over-voltage protection using an input voltage sensing

pin (V_IN).

Programmable Constant Power Limit

(Full AC Input Range)

.

Internal OTP Sensor with Hysteresis

Build-in 5-ms Soft-Start Function

Input Voltage Sensing (V_INPin) for Brown-In/Out

Protection with Hysteresis and Line Over-Voltage

Protection

FAN6755W/UW is available in a 7-pin SOP package.

Applications

General-purpose switched-mode power supplies and

flyback power converters, including:

.

LCD Monitor Power Supply

Open-Frame SMPS

ENERGY STAR® is a registered trademark of the U.S. Department of Energy and the U.S. Environmental Protection Agency.

www.fairchildsemi.com

FAN6755W / FAN6755UW • Rev. 2, Feb-2020

Ordering Information

Operating

Part Number Temperature

Range

PWM

Frequency

Packing

Method

Package

7-Lead, Small Outline Integrated Circuit

(SOIC), Depopulated JEDEC MS-112, .150

Inch Body

FAN6755WMY

-40 to +105°C

65 kHz

Reel & Tape

FAN6755UWMY -40 to +105°C

130 kHz

Application Diagram

N

EMI

Filter

Vo+

Vo-

+

L

1

VIN

7

2

6

VDD

HV

FB

+

5

GATE

3

SENSE

4

FAN6755W

Figure 1.

Typical Application

FAN6755W / FAN6755UW • Rev. 2, Feb-2020

www.fairchildsemi.com

2

Internal Block Diagram

HV

7

OTP

Re-start

Protection

OVP

OLP

V_IN-OVP

V_DD

Brownout Protection

Soft

Driver

5

GATE

V_PWM

OSC

S

R

Q

VDD

6

Internal

BIAS

UVLO

V_RESET

…

Soft-Start

Comparator

Pattern

Generator

Circuit

Blanking

SENSE

Soft-Start

V_Limit

3

Current Limit

Comparator

Green

Mode

V_RESET

OVP

Debounce

PWM

V_DD-OVP

Comparator

5.3V

Max.

Duty

V_PWM

V_IN-ON/ V_IN-OFF

Slope

Compensation

3R

Brownout Protection

V_Limit

2

FB

VIN

1

High/Low

Line Compensation

R

OLP

Delay

OLP

V_IN-OVP

Debounce

V_FB-OLP

OLP

Comparator

V_IN-Protect

4

GND

Figure 2.

Internal Block Diagram

Marking Information

7

Z: Plant Code

X: 1-Digit Year Code

Y: 1-Digit Week Code

TT: 2-Digit Die Run Code

T: Package Type (M:SOP)

P: Y=Green Package

ZXYTT

6755U

WTPM

ZXYTT

6755

WTPM

M: Manufacture Flow Code

Figure 3. Top Mark

FAN6755W / FAN6755UW • Rev. 2, Feb-2020

www.fairchildsemi.com

3

Pin Configuration

SOP-7

VIN

FB

1

2

3

4

7

HV

SENSE

6

5

VDD

GND

GATE

Figure 4.

Pin Configuration (Top View)

Pin Definitions

Pin #

Name

Description

Line-voltage detection. The line-voltage detection is used for brownout protection with

hysteresis. Constant output power limit over universal AC input range is also achieved using this

VIN pin. It is suggested to add a low-pass filter to filter out line ripple on the bulk capacitor.

Pulling VIN HIGH also triggers auto-restart protection.

1

VIN

The signal from the external compensation circuit is fed into this pin. The PWM duty cycle is

determined in response to the signal on this pin and the current-sense signal on the SENSE pin.

2

3

FB

Current sense. The sensed voltage is used for peak-current-mode control and cycle-by-cycle

current limiting.

SENSE

GND

4

5

Ground

GATE The totem-pole output driver. Soft-driving waveform is implemented for improved EMI.

Power supply. The internal protection circuit disables PWM output as long as V_DDexceeds the

OVP trigger point.

6

7

VDD

HV

For startup, this pin is connected to the line input or bulk capacitor in series with resistors.

FAN6755W / FAN6755UW • Rev. 2, Feb-2020

www.fairchildsemi.com

4

Absolute Maximum Ratings

Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be

operable above the recommended operating conditions and stressing the parts to these levels is not recommended.

In addition, extended exposure to stresses above the recommended operating conditions may affect device

reliability. The absolute maximum ratings are stress ratings only.

Symbol

V_VDD

V_FB

Parameter

Min.

Max.

30

Unit

V

DC Supply Voltage^{(1, 2)}

FB Pin Input Voltage

-0.3

7.0

V

V_SENSE

V_VIN

SENSE Pin Input Voltage

VIN Pin Input Voltage

7.0

V

7.0

V

V_HV

HV Pin Input Voltage

700

400

V

Power Dissipation (T_A＜50°C)

P_D

mW

Thermal Resistance (Junction-to-Air)

Operating Junction Temperature

150

_JA

T_J

C/W

C

-40

-55

+125

+150

+260

T_STG

T_L

Storage Temperature Range

C

Lead Temperature (Wave Soldering or IR, 10 Seconds)

C

Human Body Model,

All Pins Except HV Pin

JEDEC: JESD22-A114

5.5

2.0

ESD

kV

Charged Device Model,

All Pins Except HV Pin

JEDEC: JESD22-C101

Notes:

1. All voltage values, except differential voltages, are given with respect to the network ground terminal.

2. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device.

3. ESD with HV pin: CDM=2000 V (FAN6755W) or 1500 V (FAN6755UW), and HBM=3500 V.

FAN6755W / FAN6755UW • Rev. 2, Feb-2020

www.fairchildsemi.com

5

Electrical Characteristics

V_DD=15 V, T_A=25C, unless otherwise noted.

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Unit

V_DDSection

V_OP

Continuously Operating Voltage

Full Load

22

17

11

8.8

30

2

V

V_DD-ONStart Threshold Voltage

V_DD-OFFProtection Mode

15

9

16

10

V

UVLO

I_DD-ST

Normal Mode

6.8

7.8

V

Startup Current

V_DD-ON– 0.16 V

µA

mA

µA

I_DD-OP

I_DD-OLP

Operating Supply Current

Internal Sink Current

V_DD=15 V, GATE Open

V_DD-OLP+0.1 V

30

6.5

25

75

60

7.5

26

90

Threshold Voltage on V_DDfor HV

JFET Turn-On

V_DD-OLP

8.0

27

V

V_DD-OVPV_DDOver-Voltage Protection

V_DDOver-Voltage Protection

t_D-VDDOVP

125

200

µs

Debounce Time

HV Section

V_DC=120 V, V_DD=10 µF,

V_DD=0 V

I_HV

Supply Current Drawn from HV Pin

Leakage Current after Startup

mA

µA

2.0

3.5

1

5.0

20

HV=700 V, V_DD=V_DD-

_OFF+1 V

I_HV-LC

V_DD

V_DD-ON

V_DD-OFF

UVLO

V_DD-OLP

t

Normal Mode

Protection Mode

Figure 5.

V_DDBehavior

Continued on the following page…

FAN6755W / FAN6755UW • Rev. 2, Feb-2020

www.fairchildsemi.com

6

Electrical Characteristics

V_DD=15 V, T_A=25C, unless otherwise noted.

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Unit

Oscillator Section

62

124

±4.5

±9

65

130

±5.2

±10.4

23

68

136

±5.9

±11.8

26

FAN6755W

FAN6755UW

FAN6755W

FAN6755UW

Center

Frequency

f_OSC

Frequency in Normal Mode

kHz

Hopping

Range

f_OSC-G

t_HOP

Green-Mode Frequency

Hopping Period

20

kHz

ms

10

12

14

5

Frequency Variation vs. V_DD

Deviation

f_DV

f_DT

V_DD=11 V to 22 V

%

Frequency Variation vs.

Temperature Deviation

5

T_A=-40 to 85C=T_J

V_INSection

PWM Turn-Off (Brown-out)

0.66

0.70

0.74

V_IN-OFF

V_IN-ON

V_IN-Protect

t_VIN-Protect

V

Threshold Voltage

V_IN-OFF

0.17

+

V_IN-OFF

0.20

+

V_IN-OFF

0.23

+

PWM Turn-On (Brown in)

Threshold Voltage

Threshold Voltage of V_INOver-

Voltage Protection

5.1

60

5.3

5.5

V

Debounce Time of V_INOver-

Voltage Protection

100

140

µs

Current-Sense Section

V_LIMITat

V_IN=1 V

Threshold Voltage for Current Limit V_IN=1 V

Threshold Voltage for Current Limit V_IN=3 V

0.80

0.67

0.83

0.70

0.86

0.73

V

V_LIMITat

V_IN=3 V

V

t_PD

t_LEB

t_SS

Delay to Output

100

150

290

5.5

200

175

340

7.0

ns

Soft-Start (FAN6755UW)

Steady State

125

240

4.0

Leading-Edge Blanking Time

Period During Soft-Start Time

ns

Startup Time

ms

V_Limit

=0.92V

=5.3V

V_IN-Protect

V_IN-OFF

V_SENSE=0.83V

V_SENSE=0.7V

VIN

V_IN=1V

V_IN=3V

Figure 6.

V_INvs. V_SENSE

Continued on the following page…

FAN6755W / FAN6755UW • Rev. 2, Feb-2020

www.fairchildsemi.com

7

Electrical Characteristics

V_DD=15 V, T_A=25C, unless otherwise noted.

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Unit

Feedback Input Section

A_V

Internal FB Voltage Attenuation

Input Impedance

1/4.5

10

1/4.0

15

1/3.5

19

V/V

kΩ

V

Z_FB

V_FB=4 V

V_FB-OPENThe Maximum Clamp of FB Voltage

FB Pin Open

5.1

5.3

5.5

FB Open-Loop Protection Triggering

V_FB-OLP

Level

4.4

4.6

4.8

V

Delay Time of FB Pin Open-loop

Protection

t_D-OLP

45.0

2.8

62.5

70.0

3.2

ms

V_FB-N

V_FB-G

Green-Mode Entry FB Voltage

Green-Mode Ending FB Voltage

3.0

V

V_FB-N- 0.6

FB Threshold Voltage for Zero-Duty

Recovery

V_FB-ZDCR

1.6

1.4

1.8

1.6

2.0

1.8

V

V_FB-ZDCFB Threshold Voltage for Zero-Duty

V_{FB-ZDCR -}

ZDC Hysteresis

V_FB-ZDC

0.12

0.15

0.19

V

Frequency

+ hopping range

f_OSC

PWM

Frequency

- hopping range

+1.76KHz

f_OSC-G

-1.76KHz

V

_FB-ZDCV_FB-ZDCRV

V

FB-N

V_FB

FB-G

Figure 7.

V_FBvs. PWM Frequency

Continued on the following page…

FAN6755W / FAN6755UW • Rev. 2, Feb-2020

www.fairchildsemi.com

8

Electrical Characteristics

V_DD=15 V, T_A=25C, unless otherwise noted.

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Unit

GATE Section

DCY_MAXMaximum Duty Cycle

V_GATE-LGate Low Voltage

V_GATE-HGate High Voltage

60

8

75

90

%

V

V_DD=15 V, I_O=50 mA

V_DD=12 V, I_O=50 mA

V_DD=15 V, C_L=1 nF

1.5

V

Gate Rising Time

Gate Falling Time

t_r

t_f

ns

100

30

I_GATE-

SOURCE

mA

V

Gate Source Current

V_DD=15 V, GATE=6 V

V_DD=22 V

700

V_GATE-

CLAMP

Gate Output Clamping Voltage

18

Over-Temperature Protection Section (OTP)

T_OTP

T_Restart

Notes:

Protection Junction Temperature^(4,6)

Restart Junction Temperature^(5,6)

140

°C

T_OTP-25

4. When OTP is activated, the PWM switching is shut down.

5. When junction temperature is lower than this level, IC resumes PWM switching.

6. These parameters are guaranteed by design.

www.fairchildsemi.com

FAN6755W / FAN6755UW • Rev. 2, Feb-2020

9

Typical Performance Characteristics

Figure 9. Operation Supply Current (I_DD-OP

)

Figure 8. Startup Current (I_DD-ST) vs. Temperature

vs. Temperature

Figure 10.Start Threshold Voltage (V_DD-ON

)

Figure 11.Minimum Operating Voltage (V_DD-OFF

vs. Temperature

)

vs. Temperature

Figure 12.Supply Current Drawn from HV Pin (I_HV

)

Figure 13.HV Pin Leakage Current After Startup

(I_HV-LC) vs. Temperature

vs. Temperature

Figure 14.Frequency in Normal Mode (f_OSC

)

Figure 15.Maximum Duty Cycle (DCY_MAX

)

vs. Temperature

FAN6755W / FAN6755UW • Rev. 2, Feb-2020

www.fairchildsemi.com

10

Typical Performance Characteristics

Figure 16.FB Open-Loop Trigger Level (V_FB-OLP

)

Figure 17.Delay Time of FB Pin Open-Loop Protection

(t_D-OLP) vs. Temperature

vs. Temperature

Figure 18.PWM Turn-Off Threshold Voltage

(V_IN-OFF& V_IN-ON) vs. Temperature

Figure 19.V_DDOver-Voltage Protection (V_DD-OVP

)

vs. Temperature

Figure 20.V_INvs. V_LIMIT

FAN6755W / FAN6755UW • Rev. 2, Feb-2020

www.fairchildsemi.com

11

Functional Description

Startup Current

Gate Output / Soft Driving

For startup, the HV pin is connected to the line input or

bulk capacitor in series with diodes and/or resistors. If HV

pin is connected to the line input, a 1-kV/ 1-A diode and a

100 kΩ resistor are recommended. If HV pin is connected

to the bulk capacitor, only the resistor is required. Startup

current drawn from pin HV (typically 3.5 mA) charges the

hold-up capacitor through the diode and resistor. When

the V_DDcapacitor level reaches V_DD-ON, the startup current

switches off. At this moment, only the VDD capacitor

supplies the FAN6755W/UW to maintain V_DDbefore the

auxiliary winding of the main transformer to provide the

operating current.

The BiCMOS output stage is a fast totem-pole gate

driver. Cross conduction has been avoided to minimize

heat dissipation, increase efficiency, and enhance

reliability. The output driver is clamped by an internal

18 V Zener diode to protect power MOSFET transistors

against undesirable gate over voltage. A soft-driving

circuit is implemented to minimize EMI.

Soft-Start

For many applications, it is necessary to minimize the

inrush current at startup. The built-in 5.5 ms soft-start

circuit significantly reduces the startup current spike

and output voltage overshoot.

Operating Current

Operating current is below 2 mA. The low operating

current enables better efficiency and reduces the

requirement of V_DDhold-up capacitance.

Slope Compensation

The sensed voltage across the current-sense resistor is

used for peak-current-mode control and pulse-by-pulse

current limiting. Built-in slope compensation improves

stability and prevents sub-harmonic oscillation.

FAN6755W/UW inserts a synchronized positive-going

ramp at every switching cycle as slope compensation.

Green-Mode Operation

The proprietary green-mode function provides an off-

time modulation to reduce the switching frequency in

light-load and no-load conditions. The on time is limited

for better abnormal or brownout protection. V_FB, which is

derived from the voltage feedback loop, is taken as the

reference. Once V_FBis lower than the threshold voltage,

switching frequency is continuously decreased to the

minimum green-mode frequency of around 23 kHz.

Constant Output Power Limit

For constant output power limit over universal input-

voltage range, the peak-current threshold is adjusted by

the voltage of the VIN pin. Since the VIN pin is

connected to the rectified AC input line voltage through

the resistive divider, a higher line voltage generates a

higher V_INvoltage. The threshold voltage decreases as

V_INincreases, making the maximum output power at

high-line input voltage equal to that at low-line input.

The value of R-C network should not be so large that it

affects the power limit (shown in Figure 21). R and C

should be less than 100  and 470 pF, respectively.

Current Sensing / PWM Current Limiting

Peak-current-mode control is utilized to regulate output

voltage and provide pulse-by-pulse current limiting. The

switching current is detected by the current-sensing

resistor of SENSE pin. The PWM duty cycle is

determined by this current sense signal and V_FB, the

feedback voltage. When the voltage on the SENSE pin

reaches around V_COMP=(V_FB–0.6)/4, the PWM switching

turns off immediately.

Leading-Edge Blanking (LEB)

Each time the power MOSFET is switched on, a turn-on

spike occurs on the sense resistor. To avoid premature

termination of the switching pulse, a leading-edge

blanking time is built in. During this blanking period, the

current-limit comparator is disabled and cannot switch

off the gate driver.

FAN6755W

GATE

R

Blanking

SENSE

Circuit

C

Under-Voltage Lockout (UVLO)

The turn-on and turn-off thresholds are fixed internally

at 16 V and 7.8 V in normal mode. During startup, the

hold-up capacitor must be charged to 16 V through the

startup resistor to enable the IC. The hold-up capacitor

continues to supply V_DDbefore the energy can be

delivered from auxiliary winding of the main transformer.

V_DDmust not drop below 7.8 V during startup. This

UVLO hysteresis window ensures that the hold-up

capacitor is adequate to supply V_DDduring startup.

Figure 21. Current-Sense R-C Filter

FAN6755W / FAN6755UW • Rev. 2, Feb-2020

www.fairchildsemi.com

12

R_Lower

V_DDOver-Voltage Protection

V



 V_AC2,(unit  V)

IN

(1)

R_LowerR_Upper

V_DDover-voltage protection prevents damage due to

abnormal conditions. Once the V_DDvoltage is over the

over-voltage protection voltage (V_DD-OVP), and lasts for t_D-

_VDDOVP, the PWM pulses are disabled. When the V_DD

voltage drops below the UVLO, the internal startup circuit

turns on, and V_DDis charged to V_DD-ONto restart IC.

Thermal Overload Protection

Thermal overload protection limits total power

dissipation. When the junction temperature exceeds T_J=

+140C, the thermal sensor signals the shutdown logic

and turns off most of the internal circuitry. The thermal

sensor turns internal circuitry on again after the IC’s

junction temperature drops by 25C. Thermal overload

protection is designed to protect the FAN6755W/UW in

the event of a fault condition. For continual operation,

the controller should not exceed the absolute maximum

junction temperature of T_J= +140C.

Feedback Impedance Switching

FAN6755W/UW actively varies FB-pin impedance

(Z_FB) to reduce no-load power consumption. This

technique can further reduce operating current of the

controller when FB-pin voltage drops below V_FB-ZDC

.

Figure 22 exhibits the range that Z_FBchanges. When

V_FBis lower than V_FB-ZDC, PWM switching is stopped

and Z_FBis switched from 15 kΩ to 90 kΩ. On the other

hand, Z_FBis switched from 90 kΩ to 15 kΩ when V_FBis

Limited Power Control

higher than V_FB-ZDCR

.

The FB voltage is saturated HIGH when the power

supply output voltage drops below its nominal value and

shut regulator (KA431) does not draw current through

the opto-coupler. This occurs when the output feedback

loop is open or output is short circuited. If the FB

voltage is higher than a built-in threshold for longer than

t_D-OLP, PWM output is turned off. As PWM output is

turned off, V_DDbegins decreasing since no more energy

is delivered from the auxiliary winding.

f_osc(kHz)

Proprietary

Z_FB

=90k

Z_FB

=15k

As the protection is triggered, VDD enters into UVLO

mode. This protection feature continues as long as the

over loading condition persists. This prevents the power

supply from overheating due to overloading conditions.

V_FB(V)

V^FB-ZDCVFB-ZDCR

Noise Immunity

Noise on the current sense or control signal may cause

significant pulse-width jitter, particularly in continuous-

conduction mode. Slope compensation helps alleviate

this problem. Good placement and layout practices

should be followed. Avoiding long PCB traces and

component leads, locating compensation and filter

components near the FAN6755W/UW, and increasing

the gate resistor from GATE pin to MOSFET improve

performance.

Figure 22. Z_FB-Switching Activating Range

Brownout Protection

Since the VIN pin is connected through a resistive

divider to the rectified AC input line voltage, it can also

be used for brownout protection. If V_INis less than

0.7 V, the PWM output is shut off. When V_INreaches

over 0.9 V, the PWM output is turned on again. The

hysteresis window for ON/OFF is around 0.2 V. The

brownout voltage setting is determined by the potential

divider formed with R_Upperand R_Lower. Equations to

calculate the resistors are shown below:

FAN6755W / FAN6755UW • Rev. 2, Feb-2020

www.fairchildsemi.com

13

Typical Application Circuit

R6

R7

12V1

1

12V

P1

C7

N18

L2

2

12V

C5

1

3

R8

C10

C8

C9

+

F1

2

N1

N1A

R1

N2

BD1

C1

C2

CN1

TX1

L

L1

4

1

N4

4

12

11

N17 D1

M1

1

2

3

C3

N28

R4

N21

ZD1

VIN

C4

R3

R5

C6

AC IN

R2

8

N20

7

5V1

1

5V

P2

L3

2

5V

N

N3

N5 N6

6

1

C11

+

1

3

D3

R14

2

N7

10

9

R17

2

D4

C15

C13

C14

+

C12

R13

D5

R9

N8

P3

SGND

Q1

N30

R10

R16

N10

D2

1 N9

R11

R12

N29

R15

HV

VIN

U1

VIN

1

2

3

4

7

HV

R20

FB

VDD

FB

5V1

R22

R19

6

5

N12

N13

SENSE

GND

VDD

U2

GATE

12V

5V

C16

C18

C19

FAN6755W

FAN6755

+

R28

C17

SENSE

R23

R24

R25

C20

R21

R

N14

N15

U3

N16

R18

R26

R27

Figure 23. 44 W Flyback 12 V/2 A, 5 V/4 A Application Circuit

FAN6755W / FAN6755UW • Rev. 2, Feb-2020

www.fairchildsemi.com

14

Bill of Materials

Designator

Part Type

BD 4 A/600 V

Designator

Part Type

MOS 9 A/600 V

BD1

C1

Q1

R1

R2

R3

YC 2200 pF/Y1

XC 0.33 µF/300 V

NC

R 1.5 M 1/4 W

R 10 M 1/4 W

R 47  1/4 W

NC

C2

C3

C4

R4, R5, R6, R7

C5

R8, R17, R25, R27

YC 2200 pF/Y1

CC 2200 pF/100 V

CC 1000 pF/100 V

EC 1000 µF/25 V

EC 470 µF/25 V

CC 100 pF/50 V

EC 100 µF/400 V

C 1 µF/50 V

C6

R9

R 50 K 1/4 W

R 0  1/8 W

C7

R10

R11

R12

R13

R14

R15

R16

R18

R19

R20

R21

R22

R23

R24

R26

R28

TX1

U1

C8

C9

R 47  1/8 W

R 100 K 1/8 W

R 0  1/4 W

C10

C11

C12

C13

C14

C15

C16

C17

C18

C19

C20

D1

R 10 K 1/8 W

R 1  1/8 W

EC 1000 µF/10 V

EC 470 µF/10 V

CC 100 pF/50 V

C 1 nF/50 V

R 0  1/8 W

R 100  1/8 W

R 1 K 1/8 W

R 4.7 K 1/8 W

R 7.5 K 1/8 W

R 120 K 1/8 W

R 15 K 1/8 W

R 10 K 1/8 W

R 0.43  2 W

800 µH(ERL-28)

IC FAN6755W

IC PC817

C 470 pF/50 V

EC 47 µF/50 V

C 0.01 µF/50 V

C 0.1 µF/50 V

FYP1010

D2

1N4148

D3

FR107

D4

FR103

D5

U2

FYP1010

ZD1

F1

P6KE150A

U3

IC TL431

FUSE 4A/250V

VZ 9G

M1

L1

13 mH

L2

Inductor (2 µH)

L3

FAN6755W / FAN6755UW • Rev. 2, Feb-2020

www.fairchildsemi.com

15

Physical Dimensions

5.00

4.80

A

3.81

0.65TYP

1.75TYP

3.81

6

5

7

B

6.20

5.80

4.00

3.80

3.85 7.35

3

2

1

4

PIN #1

1.27

0.25

C B A

(0.33)

1.27

TOP VIEW

LAND PATTERN RECOMMENDATION

SEE DETAIL A

0.25

0.19

0.25

0.10

C

OPTION A - BEVEL EDGE

1.75 MAX

0.10 C

0.51

0.33

FRONT VIEW

OPTION B - NO BEVEL EDGE

0.50

0.25

x 45°

NOTES:

R0.10

GAGE PLANE

A) THIS PACKAGE DOES NOT FULLY CONFORMS

TO JEDEC MS-012, VARIATION AA, ISSUE C,

DATED MAY 1990.

0.36

B) ALL DIMENSIONS ARE IN MILLIMETERS.

8°

0°

C) DIMENSIONS DO NOT INCLUDE MOLD

FLASH OR BURRS.

SEATING PLANE

0.90

(1.04)

DETAIL A

0.406

D) STANDARD LEAD FINISH:

200 MICROINCHES / 5.08 MICRONS MIN.

LEAD/TIN (SOLDER) ON COPPER.

SCALE: 2:1

E) DRAWING FILENAME : M07Arev3

Figure 24. 7-Lead, Small Outline Package (SOP)

Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any

manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative

to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and

conditions, specifically the warranty therein, which covers Fairchild products.

FAN6755W / FAN6755UW • Rev. 2, Feb-2020

www.fairchildsemi.com

16

ON Semiconductor and

are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries.

ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent

coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein.

ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability

arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.

Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards,

regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/or

specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer

application by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not

designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification

in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized

application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and

expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such

claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal 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:

Email Requests to: orderlit@onsemi.com

TECHNICAL SUPPORT

North American Technical Support:

Voice Mail: 1 800−282−9855 Toll Free USA/Canada

Phone: 011 421 33 790 2910

Europe, Middle East and Africa Technical Support:

Phone: 00421 33 790 2910

For additional information, please contact your local Sales Representative

ON Semiconductor Website: www.onsemi.com

◊

www.onsemi.com

1


型号：	FAN6755WMY
厂家：	ONSEMI
描述：	用于 65 KHz 反激式转换器的绿色模式 PWM 控制器，提供线路过压保护和通电/欠压保护控制器转换器
文件：	总19页 (文件大小：1648K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

FAN6755WMY [ONSEMI]

相关型号：

SI9130DB

SI9135LG-T1

SI9135LG-T1-E3

SI9135_11

SI9136_11

SI9130CG-T1-E3

SI9130LG-T1-E3

SI9130_11

SI9137

SI9137DB

SI9137LG

SI9122E