FAN6862HRTY_技术文档

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FAN6862H / FAN6862HR

Highly Integrated Green-Mode PWM Controller

Features

Description

A highly integrated PWM controller, FAN6862H(HR)

provides several features to enhance the performance

of flyback converters. To minimize standby power

.

Low Startup Current: 8µA

Low Operating Current in Green Mode: 2mA

consumption,

a

proprietary Green-Mode function

Peak-Current Mode Operation with Cycle-by-Cycle

Current Limiting

provides off-time modulation to continuously decrease

the switching frequency under light-load conditions.

Under zero-load conditions, the power supply enters

Burst Mode, which completely shuts off PWM output.

Output restarts just before the supply voltage drops

below the UVLO lower limit. This Green-Mode function

enables power supplies to meet international power

conservation requirements.

.

PWM Frequency Continuously Decreasing with

Burst Mode at Light Loads

.

V_DDOver-Voltage Protection (OVP)

Constant Output Power Limit (Full AC Input Range)

Internal Latch Circuit (FAN6862H) for OVP, OTP

The FAN6862H(HR) is designed for SMPS and

integrates frequency-hopping function internally, which

helps reduce EMI emission of a power supply with

minimum line filters. The built-in synchronized slope

compensation is proprietary saw-tooth compensation for

constant output power limit over universal AC input

range. The gate output is clamped at 18V to protect the

external MOSFET from over-voltage damage.

Fixed PWM Frequency (100KHz) with Frequency

Hopping

.

Feedback Open-Loop Protection with 56ms Delay

Soft Startup Time: 5ms

Applications

Other protection functions include V_DDOver-Voltage

Protection (OVP) and Over-Temperature Protection

(OTP). For over-temperature protection, an external

NTC thermistor can be applied to sense the ambient

temperature. When V_DDOVP or OTP is activated, an

internal latch circuit latches off the controller.

General-purpose switched-mode power supplies and

flyback power converters, including:

.

Power Adapters

Open-Frame SMPS

SMPS with Surge-Current Output, such as for

Printers, Scanners, Motor Drivers

Ordering Information

Operating

Temperature

Range

Packing

Method

Part Number

OVP OLP OTP/OTP2

Package

6-Pin, Super Small Outline

Package, SuperSOT™-6

FAN6862HTY

-40 to +105°C

Latch A/R

Latch

Tape & Reel

6-Pin, Super Small Outline

Package, SuperSOT™-6

FAN6862HRTY

Auto-Restart (A/R)

www.fairchildsemi.com

FAN6862H(HR) • Rev. 2, Feb-2020

Typical Application

Figure 1. Typical Application

Block Diagram

GND

1

FAN6862H

Auto-

V_DD

OVP

Recovery

Protection

OLP

V_DD-OVP

Soft

Driver

OVP

OTP

Latch-Off

Protection

S

6

GATE

Latch-Off Release

Q

FAN6862HR

R

OLP

OVP

V_DD-LH

Auto-

Recovery

Protection

Internal

OTP

BIAS

5

VDD

V_{LIMIT_RAMP}

(Include Soft-Start)

Blanking

Circuit

4

SENSE

UVLO

OSC

Slope

Compensation

5.2V

Green

Mode

Controller

2.5R

16V/8.5V

2

FB

R

FB

OTP1

Debounce

OTP

OLP

Delay

OLP

1V

I_RT

4.6V

3

OTP2

Debounce

RT

0.7V

Figure 2. Block Diagram

FAN6862H(HR) • Rev. 2, Feb-2020

www.fairchildsemi.com

2

Marking Information

ABx:

TT:

ABO: FAN6862HTY

ABP: FAN6862HRTY

Wafer Lot Code

• • • •

ABxTT

- - -

: Year Code

Week Code

_ _ _:

Figure 3. Top Mark

Pin Configuration

Figure 4. Pin Assignments

Pin Definitions

Pin #

Name

Function

Description

1

GND

Ground

Feedback. The FB pin provides the output voltage regulation signal. It provides

feedback to the internal PWM comparator, so the PWM comparator can control

the duty cycle. This pin also provides OCP: once V_FBis larger than the trigger

level and lasts for a long time, the controller stops and restarts.

2

3

4

FB

RT

Feedback

For over-temperature protection, an external NTC thermistor is connected from

Temperature this pin to the GND pin. The impedance of the NTC thermistor decreases at high

Detection

temperatures. Once the voltage of the RT pin drops below a threshold, PWM

output is disabled.

This pin senses the voltage across a resistor. When the voltage reaches the

internal threshold, PWM output is disabled. This activates over-current

protection. This pin also provides current amplitude information for current-mode

control.

SENSE Current Sense

5

6

VDD

Power Supply Power supply

GATE

Driver Output The totem-pole output driver for driving the power MOSFET.

FAN6862H(HR) • Rev. 2, Feb-2020

www.fairchildsemi.com

3

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. All voltage values, except differential voltages, are given with

respect to GND pin.

Symbol

V_DD

V_L

Parameter

Min.

Max.

30

Unit

V

Supply Voltage

Input Voltage to FB, SENSE, RT Pins

Power Dissipation at T_A<50°C

-0.3

7.0

V

P_D

300

115

+125

+150

+260

4

mW

°C/W

°C

Θ_JC

T_J

Thermal Resistance (Junction-to-Case)

Operating Junction Temperature

-40

-55

T_STG

T_L

Storage Temperature Range

°C

Lead Temperature, Wave Soldering, 10 Seconds

Human Body Model, JESD22-A114

Charge Device Model, JESD22-C101

°C

ESD

kV

2

Recommended Operating Conditions

The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended

operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not

recommend exceeding them or designing to Absolute Maximum Ratings.

Symbol

Parameter

Min.

Max.

Unit

T_A

Operating Ambient Temperature

-40

+105

°C

FAN6862H(HR) • Rev. 2, Feb-2020

www.fairchildsemi.com

4

Electrical Characteristics

V_DD= 15V and T_A= 25°C unless otherwise noted.

Symbol

Parameter

Test Conditions Min.

Typ.

Max. Unit

V_DDSection

V_DD-OP

Continuously Operating Voltage

Turn-On Threshold Voltage

Turn-Off Voltage

24

17

9.5

5

V

V_DD-ON

15

16

8.5

4

V_DD-OFF

V_DD-LH

7.5

V

Threshold voltage for Latch-Off release

Startup Current

3

V

I_DD-ST

V_TH-ON– 0.16V

8

30

μA

With 1nF Load on

Gate, V_FB≥ V_FB-N

I_DD-OP

I_DD-BM

Normal Operating Supply Current

3

4

mA

GATE Open,

V_FB= V_FB-G

Green Mode Operating Supply Current

2.5

FAN6862H Latch,

V_DD-OVP

V_DDOver Voltage Protection

FAN6862HR Auto-

Restart

24

25

26

V

t_D-VDDOVP

I_DD-LH

V_DDOVP Debounce Time

Latch-Off Holding Current

30

40

50

65

μs

V_DD= 5V

μA

Feedback Input Section

A_V

Z_FB

Input-Voltage to Current-Sense Attenuation

1/4.0

1/3.5

6

1/3.0

V/V

kΩ

V

Input Impedance

V_FBO

V_FB-OLP

t_D-OLP

FB Pin Open Voltage

5.0

4.3

5.2

4.6

56

5.4

4.9

Threshold Voltage for Open-Loop Protection

Open-Loop Protection Delay

V

ms

Current Sense Section

t_PD

Delay to Output

100

360

0.55

0.40

5

250

ns

V

t_LEB

Leading-Edge Blanking Time

270

0.52

0.37

4

V_STHFL

V_STHVA

Flat Threshold Voltage for Current Limit

Valley Threshold Voltage for Current Limit

Duty>51%

Duty = 0%

Startup Time

0.58

0.43

6

V

t_SOFT-STARTPeriod During Startup

ms

Oscillator Section

Center Frequency

Hopping Range

Hopping Range⁽¹⁾

V

_FB> V_FB-N

95.5

100.0

±6.5

104.5

±5.9

±7.3

V_FB≥ V_FB-N

f_OSC

Normal PWM Frequency

kHz

±2.9

V_FB= V_FB-G

t_hop-1

t_hop-3

Hopping Period 1⁽¹⁾

Hopping Period 3⁽¹⁾

4.4

11.5

25

ms

V_FB≥ V_FB-N

V_FB= V_FB-G

f_OSC-G

Green Mode Minimum Frequency

23

2.4

1.9

27

2.8

2.3

kHz

FB Threshold Voltage For Frequency

Reduction

V_FB-N

2.6

V

V_FB-G

V_FB-ZDC

f_DV

FB Voltage at f_OSC-G

2.1

1.7

V

FB Threshold Voltage for Zero Duty

Frequency Variation vs. V_DDDeviation

V_DD= 11.5V to 20V

T_A= -40 to +105°C

0.02

%

Frequency Variation vs. Temperature

Deviation

f_DT

2

%

Continued on following page…

FAN6862H(HR) • Rev. 2, Feb-2020

www.fairchildsemi.com

5

Electrical Characteristics (Continued)

V_DD= 15V, T_A= 25°C, unless noted.

Symbol

Parameter

Test Conditions Min.

Typ.

Max. Unit

PWM Output Section

DCY_MAX

V_OL

Maximum Duty Cycle

Output Voltage Low

60

65

70

%

V

V_DD= 15V,

I_O= 50mA

1.5

V_DD= 8V,

I_O= 50mA

V_OH

Output Voltage High

6

V

t_R

t_F

Rising Time

GATE = 1nF

150

35

200

80

ns

V

Falling Time

V_CLAMP

Gate Output Clamping Voltage

V_DD= 20V

15.0

16.5

18.0

Over-Temperature Protection (OTP) Section

I_RT

Output Current of RT Pin

92

0.97

15

100

108

1.07

19

μA

FAN6862H Latch,

FAN6862HR Auto-

Restart

Threshold Voltage for Over-Temperature

Protection

V_OTP

1.00

V

V_FB= V_FB-N

17

51

t_DOTP

Over-Temperature Debounce Time

ms

(1)

V_FB= V_FB-G

FAN6862H Latch,

FAN6862HR Auto-

Restart

2^ndThreshold Voltage for Over-Temperature

Protection

V_OTP2

0.65

80

0.70

200

0.75

250

V

t_DOTP2

Note:

2^ndOver-Temperature Debounce Time

μs

1. Guarantee by design.

Figure 5. PWM Frequency

FAN6862H(HR) • Rev. 2, Feb-2020

www.fairchildsemi.com

6

Typical Performance Characteristics

Figure 6. Turn-On Threshold Voltage (V_DD-ON

)

Figure 7. Turn-Off Threshold Voltage (V_DD-OFF

)

vs. Temperature

Figure 8. Operating Current (I_DD-OP) vs. Temperature

Figure 9. V_DDOver-Voltage Protection (V_DD-OVP

vs. Temperature

)

Figure 10. Center Frequency (f_OSC) vs. Temperature

Figure 11. FB Threshold Voltage for Frequency

Reduction (V_FB-N) vs. Temperature

FAN6862H(HR) • Rev. 2, Feb-2020

www.fairchildsemi.com

7

Typical Performance Characteristics (Continued)

Figure 12. FB Voltage at f_OSC-G(V_FB-G) vs. Temperature

Figure 13. Threshold Voltage for Open-Loop

Protection (V_FB-OLP) vs. Temperature

Figure 14. Open-Loop Protection Delay (t_D-OLP

vs. Temperature

)

Figure 15. Flat Threshold Voltage for Current Limit

(V_STHFL) vs. Temperature

Figure 16. Valley Threshold Voltage for Current Limit Figure 17. GATE Output Clamping Voltage (V_CLAMP

(V_STHVA) vs. Temperature vs. Temperature

)

FAN6862H(HR) • Rev. 2, Feb-2020

www.fairchildsemi.com

8

Typical Performance Characteristics (Continued)

Figure 18. Maximum Duty Cycle (DCY_MAX

vs. Temperature

)

Figure 19. Rising Time (t_R) vs. Temperature

Figure 20. Falling Time (t_F) vs. Temperature

Figure 21. Output Current of RT Pin (I_RT

)

vs. Temperature

FAN6862H(HR) • Rev. 2, Feb-2020

www.fairchildsemi.com

9

Operation Description

Startup Operation

Figure 22 shows a typical startup circuit and transformer

auxiliary winding for a FAN6862H(HR) application.

Before FAN6862H(HR) begins switching, it consumes

only startup current (typically 8µA) and the current

supplied through the startup resistor charges the V_DD

capacitor (C_DD). When V_DDreaches a turn-on voltage of

16V (V_DD-ON), switching begins and the current

consumed increases to 2mA. Then, the power required

is supplied from the transformer auxiliary winding. The

large hysteresis of V_DD(8.5V) provides more holdup

time, which allows using a small capacitor for V_DD. The

startup resistor is typically connected to the AC line for a

fast reset of latch protection.

Figure 23. PWM Frequency

Figure 22. Startup Circuit

Figure 24. Burst-Mode Operation

Green-Mode Operation

The FAN6862H(HR) uses feedback voltage (V_FB) as an

indicator of the output load and modulates the PWM

frequency, as shown in Figure 23, such that the

switching frequency decreases as load decreases. In

heavy-load conditions, the switching frequency is

65KHz. Once V_FBdecreases below V_FB-N(2.6V), the

PWM frequency starts to linearly decrease from 100KHz

to 25kHz to reduce the switching losses. As V_FB

decreases below V_FB-G(2.1V), the switching frequency is

fixed at 25kHz and FAN6862H(HR) enters “deep” Green

Mode, where the operating current decreases to 2.5mA

(maximum), further reducing the standby power

consumption. As V_FBdecreases below V_FB-ZDC(1.7V),

FAN6862H(HR) enters Burst Mode. When V_FBdrops

below V_FB-ZDC, FAN6862H(HR) stops switching and the

output voltage starts to drop, which causes the feedback

voltage to rise. Once V_FBrises above V_FB-ZDC, switching

resumes. Burst Mode alternately enables and disables

switching, reducing switching loss in standby mode, as

shown in Figure 24.

Frequency Hopping

EMI reduction is accomplished by frequency hopping,

which spreads the energy over a wider frequency range

than the bandwidth measured by the EMI test

equipment. An internal frequency hopping circuit changes

the switching frequency between 93.5kHz and 106.5kHz

with a period of 4.4ms, as shown in Figure 25.

Figure 25. Frequency Hopping

FAN6862H(HR) • Rev. 2, Feb-2020

www.fairchildsemi.com

10

Protections

cycle when the sensing voltage of MOSFET drain

current reaches the threshold. The other threshold is for

the over-current protection, which shuts down the

MOSFET gate when the sensing voltage of MOSFET

drain current is above the threshold longer than the

shutdown delay (56ms).

Self-protective functions include V_DDOver-Voltage

Protection (OVP), Open-Loop / Overload Protection

(OLP), Over-Current Protection (OCP), Short-Circuit

Protection (SCP), and Over-Temperature Protection

(OTP). OLP, OCP, and SCP are Auto-Restart Mode

protections; OVP and OTP are Latch-Mode protections.

In FAN6862HR, all of these protections are applied with

Auto-Restart Mode.

Open-Loop / Overload Protection (OLP)

When the upper branch of the voltage divider for the

shunt regulator (KA431 shown in Figure 27) is broken,

no current flows through the opto-coupler transistor,

which pulls up the feedback voltage to 5.2V.

Auto-Restart Mode Protections

Once

terminated and the MOSFET remains off. This causes

_DDto fall because no more power is delivered from the

a fault condition is detected, switching is

V

When feedback voltage is above 4.6V for longer than

56ms, OLP is triggered. This protection is also triggered

when the SMPS output drops below the nominal value

for longer than 56ms due to the overload condition.

auxiliary winding. When V_DDfalls to V_DD-OFF(8.5V), the

protection is reset and the operating current reduces to

startup current, which causes V_DDto rise.

FAN6862H(HR) resumes normal operation when V_DD

reaches V_DD-ON(16V). In this manner, the auto-restart

can alternately enable and disable MOSFET switching

until the fault condition is eliminated (see Figure 26).

Figure 27. OLP Operation

V_DDOver-Voltage Protection (OVP)

V_DDover-voltage protection prevents IC damage caused

by over voltage on the VDD pin. The OVP is triggered

when V_DDreaches 25V. A debounce time (typically

30µs) prevents false triggering by switching noise.

Figure 26. Auto-Restart Operation

Latch-Mode Protections

Once this protection is triggered, switching is terminated

and the MOSFET remains off. The latch is reset only

when V_DDis discharged below 4V by unplugging the

AC power line.

Over-Temperature Protection (OTP)

The OTP circuit is composed of current source and

voltage comparators. Typically, an NTC thermistor is

connected between the RT and GND pins. If the voltage

of this pin drops below a threshold of 1.0V, PWM output

is disabled after t_DOTPdebounce time. If this pin drops

below 0.7V, it triggers the latch-off protection

immediately after t_DOTP2debounce time.

Over-Current Protection (OCP)

FAN6862H(HR) has two over-current protection

thresholds. One is for pulse-by-pulse current limit, which

turns off MOSFET for the remainder of the switching

FAN6862H(HR) • Rev. 2, Feb-2020

www.fairchildsemi.com

11

Typical Application Circuit (Netbook Adapter by Flyback)

Application

Fairchild Devices

Input Voltage Range

Output

Netbook Adapter

FAN6862H(HR)

90~265V_AC

19V / 2.1A (40W)

Features

.

High efficiency (>85.3% at full-load condition), meeting EPS regulation with enough margin

Low standby (pin<0.15W at no-load condition)

Soft-start time: 5ms

230V_AC50Hz (87% avg.)

115V_AC60Hz (87.2% avg.)

85.29% (Energy Star V2.0)

Figure 28. Measured Efficiency and Power Saving

Figure 29. Schematic of Typical Application Circuit

FAN6862H(HR) • Rev. 2, Feb-2020

www.fairchildsemi.com

12

Transformer Specification

.

Core: RM 8

Bobbin: RM 8

1

2

Primary Winding II

^ndShield

2

11

Fly+

Fly-

Secondary

Winding

1^stShield

11

2

3

Primary Winding I

10

11

Auxiliary Winding

BOBBIN

Figure 30. Transformer

Terminal

Insulation

Barrier

Primary Secondary

NO

Wire

Ts

S

11

3

F

10

2

Ts

3

N1

N2

0.37 • 1

7

22

1.2

8

1

11

Fly-

11

2

COPPER SHIELD

0.75 • 2

3

N3

N4

Fly+

1

COPPER SHIELD

0.37 • 1

1.2

22

3

4

CORE ROUNDING TAPE

3

3－1

Specification

Remark

Primary-Side Inductance

610µH ±5%

100kHz, 1V

Primary-Side Effective Leakage

15µH Maximum Short One of the Secondary Windings

FAN6862H(HR) • Rev. 2, Feb-2020

www.fairchildsemi.com

13

Physical Dimensions

Figure 31. 6-Pin, SuperSOT™6, JEDEC MO-193, 1.6mm Wide

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.

FAN6862H(HR) • Rev. 2, Feb-2020

www.fairchildsemi.com

14

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

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1


型号：	FAN6862HRTY
厂家：	ONSEMI
描述：	用于 100 KHz 反激式转换器的 6 引脚绿色模式 PWM 控制器控制器开关光电二极管转换器
文件：	总17页 (文件大小：872K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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