FSBH0370NY_技术文档

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FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370

Green Mode Fairchild Power Switch (FPS™)

Features

Description

The highly integrated FSBH-series consists of an

integrated current-mode Pulse Width Modulator (PWM)

and an avalanche-rugged 700V SenseFET. It is

specifically designed for high-performance offline

Switch Mode Power Supplies (SMPS) with minimal

external components.

Brownout Protection with Hysteresis

Built-In 5ms Soft-Start Function

Internal Avalanche-Rugged 700V SenseFET

No Acoustic Noise During Light-Load Operation

High-Voltage Startup

The integrated PWM controller features include a

proprietary green-mode function that provides off-time

modulation to linearly decrease the switching frequency

at light-load conditions to minimize standby power

consumption. To avoid acoustic-noise problems, the

minimum PWM frequency is set above 18kHz. This

green-mode function enables the power supply to meet

international power conservation requirements. The

PWM controller is manufactured using the BiCMOS

process to further reduce power consumption. The

FSBH-series turns off some internal circuits to improve

power saving when V_FBis lower than 1.6V, which allows

an operating current of only 2.5mA.

Linearly Decreasing PWM Frequency to 18KHz

Peak-Current-Mode Control

Cycle-by-Cycle Current Limiting

Leading-Edge Blanking (LEB)

Synchronized Slope Compensation

Internal Open-Loop Protection

V_DDUnder-Voltage Lockout (UVLO)

V_DDOver-Voltage Protection (OVP)

Internal Auto-Restart Circuit (OVP, OTP)

Constant Power Limit (Full AC Input Range)

Internal OTP Sensor with Hysteresis

The FSBH-series has built-in synchronized slope

compensation to achieve stable peak-current-mode

control. The proprietary external line compensation

ensures constant output power limit over a wide AC

input voltage range, from 90V_ACto 264V_AC

.

VIN Pin for Pull-HIGH Latch Function and Pull-

LOW Auto-Recovery Protection

The FSBH-series provides many protection functions. In

addition to cycle-by-cycle current limiting, the internal

open-loop protection circuit ensures safety when an

open-loop or output short occurs. PWM output is

disabled until V_DDdrops below the V_TH-OLP, then the

controller starts up again. As long as V_DDexceeds 28V,

the internal OVP circuit is triggered.

Applications

General-purpose switch-mode power supplies and

flyback power converters, including:

Auxiliary Power Supply for PC and Server

Compared with a discrete MOSFET and controller or

RCC switching converter solution, the FSBH-series

reduces total component count, design size, and

weight; while increasing efficiency, productivity, and

system reliability. These devices provide a basic

platform that is well suited for the design of cost-

effective flyback converters, such as in PC auxiliary

power supplies.

SMPS for VCR, SVR, STB, DVD & DVCD Player,

Printer, Facsimile, and Scanner

Adapter for Camcorder

www.fairchildsemi.com

FSBH0270 • Rev. 2, Feb-2020

Ordering Information

Operating

Temperature Range

VIN Pin

(PIN #4)

Packing

Method

Part Number

Sense FET

Package

FSBH0F70ANY

FSBH0170ANY

FSBH0270ANY

FSBH0170NY

FSBH0270NY

FSBH0370NY

0.5A 700V

1.0A 700V

2.0A 700V

1.0A 700V

2.0A 700V

3.0A 700V

-40°C to +105°C

Not Available

Enabled

8-Pin Dual In-Line

Package (DIP)

Tube

Application Diagram

HV

Drain

VIN

FB

VDD

GND

Figure 1. Typical Flyback Application

230V_AC± 15%⁽²⁾

Output Power Table⁽¹⁾

85-265V_AC

Product

Adapter⁽³⁾

Open Frame⁽⁴⁾

Adapter⁽³⁾

Open Frame⁽⁴⁾

FSBH0F70A

FSBH0170/A

FSBH0270/A

7W

10W

15W

20W

25W

6W

9W

8W

13W

16W

19W

14W

11W

13W

FSBH0370

17.5W

Notes:

1. The maximum output power can be limited by junction temperature.

2. 230 V_ACor 100/115 V_ACwith doublers.

3. Typical continuous power in a non-ventilated enclosed adapter with sufficient drain pattern as a heat sink at

50°C ambient.

4. Maximum practical continuous power in an open-frame design with sufficient drain pattern as a heat sink at

50°C ambient.

FSBH0270 • Rev. 2, Feb-2020

www.fairchildsemi.com

2

Internal Block Diagrams

Figure 2. FSBH0170, FSBH0270, FSBH0370 Internal Block Diagram

Figure 3. FSBH0F70A, FSBH0170A, FSBH0270A Internal Block Diagram

FSBH0270 • Rev. 2, Feb-2020

www.fairchildsemi.com

3

Pin Configuration

8

F – Fairchild Logo

Z – Plant Code

ZXYTT

BH0F70A

TPM

ZXYTT

BH0170A

TPM

X – 1-Digit Year Code

Y – 1-Digit Week Code

TT – 2-Digit Die Run Code

T – Package Type (N:DIP)

P – Y: Green Package

M – Manufacture Flow Code

1

8

1

8

ZXYTT

BH0270A

TPM

ZXYTT

BH0170

TPM

1

8

1

8

ZXYTT

BH0270

TPM

ZXYTT

BH0370

TPM

1

Figure 4. Pin Configuration and Top Mark Information

Pin Definitions

Pin #

Name Description

1

GND

Ground. SenseFET source terminal on primary side and internal controller ground.

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

OVP trigger point.

2

3

VDD

Feedback. 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 internal current-sense signal.

FB

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

hysteresis and constant output power limit over universal AC input range. This pin has additional

protections that are pull-HIGH latch and pull-LOW auto recovery, depending on the application.

VIN

4

NC

HV

No Connection for FSBH0F70A, FSBH0170A and FSBH0270A.

5

6

7

8

Startup. For startup, this pin is pulled HIGH to the line input or bulk capacitor via resistors.

SenseFET Drain. High-voltage power SenseFET drain connection.

Drain

FSBH0270 • 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

Parameter

Min.

Max.

700

1.5

4.0

8.0

12.0

10

Unit

V_DRAIN

Drain Pin Voltage^(5,6)

FSBH0x70/A

FSBH0F70A

FSBH0170/A

FSBH0270/A

FSBH0370

V

I_DM

Drain Current Pulsed⁽⁷⁾

A

FSBH0F70A

FSBH0170/A

FSBH0270/A

FSBH0370

50

E_AS

Single Pulsed Avalanche Energy⁽⁸⁾

mJ

140

230

30

V_DD

V_FB

V_IN

V_HV

P_D

DC Supply Voltage

V

FB Pin Input Voltage

-0.3

7.0

700

1.5

80

VIN Pin Input Voltage

V

HV Pin Input Voltage

V

Power Dissipation (T_A＜50°C)

Junction-to-Air Thermal Resistance

Junction-to-Case Thermal Resistance

Operating Junction Temperature

Storage Temperature Range

W

θ_JA

θ_JC

T_J

°C/W

°C

20

Internally limited⁽⁹⁾

T_STG

T_L

-55

+150

+260

°C

Lead Temperature (Wave Soldering or IR, 10 Seconds)

Human Body Model:

°C

3

1

JESD22-A114

Electrostatic Discharge Capability,

All pins except HV pin

ESD

kV

Charged Device Model:

JESD22-C101

Notes:

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

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

7. Non-repetitive rating: pulse width is limited by maximum junction temperature.

8. L = 51mH, starting T_J= 25°C.

9. Internally Limited of T_Jrefers to T_OTP

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

Conditions

Min.

Typ.

Max.

Unit

T_A

Operating Ambient Temperature

-40

+105

°C

FSBH0270 • Rev. 2, Feb-2020

www.fairchildsemi.com

5

Electrical Characteristics

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

Symbol

Parameter

Condition

Min.

Typ.

Max.

Unit

SenseFET Section⁽¹⁰⁾

Drain-Source

Breakdown Voltage

BV_DSS

FSBH0x70/A

V_DS= 700V, V_GS= 0V

700

V

V_DS= 700V, V_GS= 0V

50

Zero-Gate-Voltage

Drain Current

I_DSS

μA

V_DS= 560V, V_GS= 0V,

T_C= 125°C

200

FSBH0F70A

FSBH0170/A

FSBH0270/A

FSBH0370

14.00

8.80

6.00

4.00

162

250

550

315

18

19.00

11.00

7.20

4.75

211

325

715

410

24

Drain-Source On-

R_DS(ON)

C_ISS

C_OSS

C_RSS

t_D(ON)

t_R

V

_GS= 10V, I_D= 0.5A

Ω

State Resistance⁽¹¹⁾

FSBH0F70A

FSBH0170/A

FSBH0270/A

FSBH0370

V_GS= 0V, V_DS= 25V,

f = 1MHz

Input Capacitance

Output Capacitance

pF

ns

FSBH0F70A

FSBH0170/A

FSBH0270/A

FSBH0370

25

33

V_GS= 0V, V_DS= 25V,

f = 1MHz

38

50

47

61

FSBH0F70A

FSBH0170/A

FSBH0270/A

FSBH0370

3.8

5.7

10.0

17.0

9.0

15.0

26.0

24.0

29.0

34.0

50.0

33.0

48

Reverse Transfer

Capacitance

V_GS= 0V, V_DS= 25V,

f = 1MHz

FSBH0F70A

FSBH0170/A

FSBH0270/A

FSBH0370

9.5

12.0

20.0

11.2

19

Turn-On Delay Time

Rise Time

V_DS= 350V, I_D= 1.0A

FSBH0F70A

FSBH0170/A

FSBH0270/A

FSBH0370

4

18

V_DS= 350V, I_D= 1.0A

15

40

34

78

FSBH0F70A

FSBH0170/A

FSBH0270/A

FSBH0370

33.0

30.0

55.0

28.2

42

76.0

70.0

120.0

67.0

94

t_D(OFF)

Turn-Off Delay Time

V_DS= 350V, I_D= 1.0A

FSBH0F70A

FSBH0170/A

FSBH0270/A

FSBH0370

10

30

t_F

Fall Time

25

60

32

74

Continued on the following page…

FSBH0270 • Rev. 2, Feb-2020

www.fairchildsemi.com

6

Electrical Characteristics (Continued)

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

Symbol

Parameter

Condition

Min.

Typ.

Max.

Unit

Control Section

V_DDSection

V_DD-ON

Start Threshold Voltage

11

7

12

8

13

9

V

V_DD-OFF

Minimum Operating Voltage

FSBH0170

FSBH0270

FSBH0370

V

_DD-ON– 0.16V

30

I_DD-ST

Startup Current

µA

FSBH0F70A

FSBH0170A

FSBH0270A

V_DD-ON– 0.16V

240

320

400

I_DD-OP

I_DD-ZDC

I_DD-OLP

V_TH-OLP

V_DD-OVP

Operating Supply Current

Operating Current for V_FB<V_FB-ZDC

Internal Sink Current

V_DD= 15V, V_FB= 3V

V_DD= 12V, V_FB= 1.6V

V_TH-OLP+0.1V

3.0

1.5

30

5

3.5

2.5

70

6

4.0

3.5

90

7

mA

µA

V

I_DD-OLPOff Voltage

V_DDOver-Voltage Protection

27

28

29

V

V_DDOver-Voltage Protection

Debounce Time

t_D-VDD-OVP

75

130

200

µs

HV Section

HV 120V_DC

,

I_HV

Maximum Current Drawn from HV Pin

Leakage Current after Startup

5.0

20

mA

µA

1.5

3.5

1

V_DD= 0V with 10µF

HV = 700V,

_DD= V_DD-OFF+1V

I_HV-LC

V

Oscillator Section

f_OSC

f_OSC-G

D_MAX

f_DV

Frequency in Nominal Mode

94

14

100

18

106

22

kHz

%

Center Frequency

Green-Mode Frequency

Maximum Duty Cycle

85

Frequency Variation vs. V_DDDeviation V_DD= 11V to 22V

5

%

Frequency Variation vs. Temperature

T_A= -25 to 85°C

f_DT

%

Deviation⁽¹⁰⁾

V_INSection (FSBH0170, FSBH0270, FSBH0370)

V_IN-ON

PWM Turn-On Threshold Voltage

PWM Turn-Off Threshold Voltage

1.08

1.13

1.18

V

V_IN-ON

0.48

–

V_IN-ON

0.54

500

–

V_IN-ON

0.60

–

V_IN-OFF

t_IN-OFF

V_IN-H

t_IN-H

PWM Turn-Off Debounce Time

Pull-HIGH Latch Trigger Level

Pull-HIGH Latch Debounce Time

ms

V

4.4

0.2

4.7

100

0.3

5.0

0.4

µs

Pull-LOW Auto-Recovery Trigger

Level

V_IN-L

V

Feedback Input Section

FB Voltage to Current-Sense

Attenuation

A_V

1/4.5

4

1/4.0

1/3.5

7

V/V

Z_FB

Input Impedance

kΩ

Continued on the following page…

FSBH0270 • Rev. 2, Feb-2020

www.fairchildsemi.com

7

Electrical Characteristics (Continued)

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

Symbol

V_FB-OPEN

V_FB-N

Parameter

Output High Voltage

Condition

FB Pin Open

Min.

5.5

Typ.

Max.

Unit

V

Green-Mode Entry FB Voltage

Green-Mode Ending FB Voltage

Zero Duty Cycle FB Voltage

2.3

2.5

2.0

1.6

5.4

4.6

56

2.7

2.1

V

V_FB-G

1.9

V

V_FB-ZDC

V

FSBH0F70A

FSBH0x70/A

5.2

4.4

50

5.6

4.8

59

V

FB Open-Loop

Trigger Level

V_FB-OLP

V

t_D-OLP

FB Open-Loop Protection Delay

ms

Current-Sense Section⁽¹⁴⁾

FSBH0F70A

FSBH0170/A

FSBH0270/A

FSBH0370

V_INOpen

0.63

0.70

0.90

1.10

4.5

0.73

0.80

1.00

1.20

5.0

0.83

0.90

1.10

1.30

5.5

V_IN= 1.2V / V_INOpen

V_IN= 1.2V

I_LIM

Peak Current Limit

A

t_SS

Constant Power Limit (FSBH0170, FSBH0270, FSBH0370)

Period During Soft-Start Time⁽¹⁰⁾

ms

V_LMT1

V_LMT2

Threshold Voltage 1 for Current Limit

Threshold Voltage 2 for Current Limit

V

_IN= 1.2V

0.73

0.56

0.80

0.63

0.87

0.70

V

V_IN= 3.6V

Current Limit (FSBH0F70A, FSBH0170A, FSBH0270A)

FSBH0F70A

0.97

0.77

1.00

0.80

1.03

0.83

V

V_LMT

Threshold Voltage for Current Limit

FSBH0170A/0270A

Over-Temperature Protection Section (OTP)

T_OTP

Protection Junction Temperature^{(10, 12)}

Restart Junction Temperature^{(10, 13)}

+135

+142

+150

°C

T_RESTART

T_OTP-25

Notes:

10. These parameters, although guaranteed, are not 100% tested in production.

11. Pulse test: pulse width ≤ 300ìs, duty ≤ 2%.

12. When activated, the output is disabled and the latch is turned off.

13. The threshold temperature for enabling the output again and resetting the latch after over-temperature

protection has been activated.

14. These parameters, although guaranteed, are tested in wafer process.

PWM Frequency

f_OSC

f_OSC-G

V

_FB-ZDCV_FB-G

V_FB-N

V_FB

Figure 5. V_FBvs. PWM Frequency

FSBH0270 • Rev. 2, Feb-2020

www.fairchildsemi.com

8

Typical Characteristics (Continued)

14

12

10

8

3.02

3.00

2.98

2.96

2.94

2.92

2.90

2.88

2.86

6

4

2

0

-40

-25 -10

5

20

35

50

65

80

95

110 125

-40 -25 -10

5

20

35

50

65

80

95 110 125

Temperature(°C)

Figure 6. I_DD-STvs. Temperature

Figure 7. I_DD-OPvs. Temperature

12.4

8.3

12.2

12.0

11.8

11.6

11.4

11.2

8.2

8.1

8.0

7.9

7.8

7.7

-40 -25 -10

5

20

35

50

65

80

-40

-25

-10

5

20

35

50

65

80

95

110 125

Temperature(°C)

Figure 8. V_DD-ONvs. Temperature

Figure 9. V_DD-OFFvs. Temperature

6.6

6.4

6.2

6.0

5.8

5.6

5.4

5.2

5.0

28.42

28.41

28.40

28.39

28.38

28.37

28.36

28.35

-40

-25 -10

5

20

35

50

65

80

-40 -25 -10

5

20

35

50

65

80

95

110 125

Temperature(°C)

Figure 10. V_TH-OLPvs. Temperature

Figure 11. V_DD-OVPvs. Temperature

4.0

3.5

3.0

2.5

2.0

1.5

1.0

7

6

5

4

3

2

1

0

-40 -25

-10

5

20

35

50

65

80

95

110 125

-40

-25

-10

5

20

35

50

65

80

95

110 125

Temperature(°C)

Figure 12. I_HVvs. Temperature

Figure 13. I_HV-LCvs. Temperature

FSBH0270 • Rev. 2, Feb-2020

www.fairchildsemi.com

9

Typical Characteristics (Continued)

101.5

101.0

100.5

100.0

99.5

19.2

19.1

19.0

18.9

18.8

18.7

18.6

99.0

98.5

98.0

97.5

-40 -25 -10

5

20

35

50

65

80

95

110 125

-40

-25 -10

5

20

35

50

65

80

95

110 125

Temperature(°C)

Figure 14. f_OSCvs. Temperature

Figure 15. f_OSC-Gvs. Temperature

0.64

0.63

0.62

0.61

0.60

0.59

0.58

1.17

1.16

1.15

1.14

1.13

1.12

1.11

-40

-25 -10

5

20

35

50

65

80

95

110 125

-40

-25 -10

5

20

35

50

65

80

95

110 125

Temperature(°C)

Figure 16. V_IN-OFFvs. Temperature

Figure 17. V_IN-ONvs. Temperature

4.63

4.62

4.61

4.60

4.59

4.58

4.57

0.34

0.33

0.32

0.31

0.30

0.29

0.28

-40

-25 -10

5

20

35

50

65

80

95

-40

-25 -10

5

20

35

50

65

80

95

Temperature(°C)

Figure 18. V_IN-Hvs. Temperature

Figure 19. V_IN-Lvs. Temperature

4.75

4.70

4.65

4.60

4.55

4.50

4.45

4.40

4.35

2.60

2.55

2.50

2.45

2.40

2.35

2.30

-40

-25 -10

5

20

35

50

65

80

95

-40 -25

-10

5

20

35

50

65

80

95

Temperature(°C)

Figure 20. V_FB-OLPvs. Temperature

Figure 21. V_FB-Nvs. Temperature

FSBH0270 • Rev. 2, Feb-2020

www.fairchildsemi.com

10

Typical Characteristics (Continued)

2.20

2.15

2.10

2.05

2.00

1.95

1.90

1.85

1.80

1.800

1.700

1.600

1.500

1.400

1.300

1.200

-40

-25 -10

5

20

35

50

65

80

95

110 125

-40 -25 -10

5

20

35

50

65

80

95

110 125

Temperature(°C)

Figure 22. V_FB-Gvs. Temperature

Figure 23. V_FB-ZDCvs. Temperature

2.56

2.54

2.52

2.50

2.48

2.46

2.44

2.42

55.0

54.5

54.0

53.5

53.0

52.5

52.0

51.5

-40

-25 -10

5

20

35

50

65

80

95

110 125

-40

-25 -10

5

20

35

50

65

80

95

110 125

Temperature(°C)

Figure 24. I_DD-ZDCvs. Temperature

Figure 25. t_D-OLPvs. Temperature

FSBH0270 • Rev. 2, Feb-2020

www.fairchildsemi.com

11

Functional Description

Startup Operation

Brown-In/Out Function

The HV pin is connected to bulk voltage through an

external resistor, R_HV, as shown in Figure 26. When AC

voltage is applied to power system, an internal HV

startup circuit provides a high current (around 3.5mA) to

charge an external V_DDcapacitor until V_DDvoltage

exceeds the turn-on threshold voltage (V_DD-ON). For

better power consumption, the HV startup circuit shuts

down during normal operation. The external V_DD

capacitor and auxiliary winding maintain the V_DDvoltage

and provide operating current to controller.

FSBH0x70 has a built-in internal brown-in/out protection

comparator monitoring voltage of VIN pin. Figure 28

shows a resistive divider with low-pass filtering for line-

voltage detection on the VIN pin.

Figure 28. Brown-In/Out Function on VIN Pin

Once the VIN pin voltage is lower than 0.6V and lasts

for 500ms, the PWM gate is disabled to protect the

system from over current. FSBH0x70 starts up as V_IN

increases above 1.1V. Because the divider resistors of

the VIN pin are connected behind the bridge, the ratio

calculation for brownout in PFC and non-PFC system

are different, as shown in Figure 29. The formulas are

provided in the following equations:

Figure 26. Startup Circuit

Slope Compensation

The FSBH-series is designed for flyback power

converters. The peak-current-mode control is used to

optimize system performance. Slope compensation is

added to reduce current loop gain and improve power

system stability. The FSBH-series has

synchronized, positive slope for each switching cycle.

Brownout with PFC:

R_C

2

⋅ 2V_{AC _OUT}

⋅

= 0.6

(1)

(2)

(3)

R_A+ R_B+ R_C

π

a built-in,

Brownout with non-PFC:

R_C

Soft-Start

⋅ 2V_{AC _OUT}= 0.6

R_A+ R_B+ R_C

The FSBH-series has an internal soft-start circuit that

reduces the SenseFET switching current during power

system startup. The characteristic curve of soft-start

time versus V_LMTlevel is shown in Figure 27. The V_LMT

level slopes up like a six-step staircase. In doing so,

power system can smoothly build up the rated output

voltage and effectively reduce voltage stress on the

PWM switch and output diode.

Brown-in level is determined by:

1.1 R_A+ R_B+ R_C

V_{AC _IN}

=

⋅

R_C

2

Figure 27. Soft-Start Function

Figure 29. V_INLevel According to PFC Operation

FSBH0270 • Rev. 2, Feb-2020

www.fairchildsemi.com

12

Brown-In Function of FSBH0x70A

H/L Line Over-Power Compensation

The VIN pin functions are disabled from FSBH0x70A,

but FSBH0x70A has brown-in protection in the VDD pin.

There is a discharge current internal from V_DDto ground

during startup. The HV source current must be larger

than I_DD-STto charge the capacitor of V_DD. Therefore, the

brown-in level can be determined by R_HVaccording to

the equation:

To limit the output power of the converter constantly,

high/low line over-power compensation is included.

Sensing the converter input voltage through the VIN pin,

the high/low line compensation function generates a

relative peak-current-limit threshold voltage for constant

power control, as shown in Figure 32.

2V_AC−12

I_DD−ST

R_HV

=

(4)

Green-Mode Operation

The FSBH-series uses feedback voltage (V_FB) as an

indicator of the output load and modulates the PWM

frequency, as shown in Figure 30, such that the

switching frequency decreases as load decreases. In

heavy load conditions, the switching frequency is

100kHz. Once V_FBdecreases below V_FB-N(2.5V), the

PWM frequency starts to linearly decrease from 100kHz

to 18kHz for reducing switching losses. As V_FB

decreases below V_FB-G(2.0V), the switching frequency is

fixed at 18kHz and FSBH-series enters “deep” green

mode to reduce the standby power consumption.

Figure 32. Constant Power Control

Protections

The FSBH-series provides full protection functions to

prevent the power supply and the load from being

damaged. The protection features include:

Latch/Auto-Recovery Function

Besides the brownout protection and high/low line over-

power compensation, the FSBH0170/0270/0370 has

additional protections via the VIN pin, such as pull-

HIGH latch and pull-LOW auto-recovery that depends

on the application. As shown in Figure 33, V_INlevel is

higher than 4.7V, FSBH-series is latched until the V_DDis

discharged. FSBH-series is auto-recovery when the V_IN

level is lower than 0.3V.

Figure 30. PWM Frequency

As V_FBdecreases below V_FB-ZDC(1.6V), FSBH-series

enters into burst-mode operation. When V_FBdrops

below V_FB-ZDC, FSBH-series 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, thereby reducing switching loss to

improve power saving, as shown in Figure 31.

V_O

Figure 33. VIN Pin Function

Open-Loop / Overload Protection (OLP)

V_FB

When the upper branch of the voltage divider for the

shunt regulator (KA431 shown) is broken, as shown in

Figure 34, or over current or output short occurs, there

is no current flowing through the opto-coupler transistor,

which pulls the feedback voltage up to 6V.

V_FB.ZDC

(1.6V)

I_Drain

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

longer than 56ms due to the overload condition.

Switching

Disabled

Switching

Disabled

Figure 31. Burst-Mode Operation

FSBH0270 • Rev. 2, Feb-2020

www.fairchildsemi.com

13

6V

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_DDvoltage reaches 28V. Debounce time (typically

130µs) prevents false trigger by switching noise.

V_FB

Vo

PWM

3R

R

Over-Temperature Protection (OTP)

The SenseFET and the control IC are integrated,

making it easier to detect the temperature of the

KA431

SenseFET.

When

the

temperature

exceeds

approximately 142°C, thermal shutdown is activated.

56ms

OLP

Feedback Open

Loop

4.6V

Figure 34. OLP Operation

FSBH0270 • Rev. 2, Feb-2020

www.fairchildsemi.com

14

Physical Dimensions

9.83

9.00

6.67

6.096

8.255

7.61

3.683

3.20

7.62

5.08 MAX

0.33 MIN

3.60

3.00

(0.56)

2.54

0.356

0.20

0.56

0.355

9.957

7.87

1.65

1.27

7.62

NOTES: UNLESS OTHERWISE SPECIFIED

A) THIS PACKAGE CONFORMS TO

JEDEC MS-001 VARIATION BA

B) ALL DIMENSIONS ARE IN MILLIMETERS.

C) DIMENSIONS ARE EXCLUSIVE OF BURRS,

MOLD FLASH, AND TIE BAR EXTRUSIONS.

D) DIMENSIONS AND TOLERANC

ASME Y14.5M-1994

ES PER

E) DRAWING FILENAME AND REVSION: MKT-N08FREV2.

Figure 35. 8-Pin Dual In-Line Package (DIP)

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.

FSBH0270 • Rev. 2, Feb-2020

www.fairchildsemi.com

15

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1


型号：	FSBH0370NY
厂家：	ONSEMI
描述：	用于 19 W 离线反激式转换器的 700 V 集成电源开关，100 kHz，提供通电/欠压保护开关信息通信管理电源开关光电二极管转换器
文件：	总18页 (文件大小：1216K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

FSBH0370NY [ONSEMI]

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