Datasheet FSBH0F70A, FSBH0170, FSBH0170A, FSBH0270, FSBH0270A Datasheet (Fairchild)

...

April 2010

FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 Green Mode Fairchild Power Switch (FPS™)

FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 — Green Mode Fairchild Power Switch (FPS™)

Features

 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  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  V

Under-Voltage Lockout (UVLO)

Over-Voltage Protection (OVP)

 Internal Auto-Restart Circuit (OVP, OTP)  Constant Power Limit (Full AC Input Range)  Internal OTP Sensor with Hysteresis  VIN Pin for Pull-HIGH Latch Function and Pull-

LOW Auto-Recovery Protection

Applications

General-purpose switch-mode power supplies and flyback power converters, including:

 Auxiliary Power Supply for PC and Server  SMPS for VCR, SVR, STB, DVD & DVCD Player,

Printer, Facsimile, and Scanner

 Adapter for Camcorder

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.

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 an operating current of only 2.5mA.

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

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 controller starts up again. As long as V the internal OVP circuit is triggered.

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 costeffective flyback converters, such as in PC auxiliary power supplies.

is lower than 1.6V, which allows

to 264VAC.

drops below the V

TH-OLP

, then the

exceeds 28V,

Ordering Information

FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 — Green Mode Fairchild Power Switch (FPS™)

Part Number Sense FET

Operating

Temperature Range

FSBH0F70ANY 0.5A 700V -40°C to +105°C

FSBH0170ANY 1.0A 700V -40°C to +105°C

FSBH0270ANY 2.0A 700V -40°C to +105°C

FSBH0170NY 1.0A 700V -40°C to +105°C

FSBH0370NY 3.0A 700V -40°C to +105°C

Application Diagram

Drain

VIN

GNDVDDFB

VIN Pin

(PIN #4)

Not Available

Enabled FSBH0270NY 2.0A 700V -40°C to +105°C

Package

8-Pin Dual In-Line Package (DIP)

Packing

Method

Tube

Figure 1. Typical Flyback Application

Output Power Table

Product

FSBH0F70A 7W 10W 6W 8W

FSBH0170/A 10W 15W 9W 13W

FSBH0270/A 14W 20W 11W 16W

FSBH0370 17.5W 25W 13W 19W

Notes:

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

2. 230 V

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.

or 100/115 V

(1)

Adapter

with doublers.

230V

± 15%

(3)

Open Frame

(2)

85-265VAC

(4)

Adapter

(3)

Open Frame

(4)

Internal Block Diagrams

FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 Green — Mode Fairchild Power Switch (FPS™)

Figure 2. FSBH0170, FSBH0270, FSBH0370 Internal Block Diagram

Figure 3. FSBH0F70A, FSBH0170A, FSBH0270A Internal Block Diagram

Pin Configuration

FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 — Green Mode Fairchild Power Switch (FPS™)

ZXYTT

BH0F70A

TPM

ZXYTT

BH0270A

TPM

ZXYTT

BH0270

TPM

ZXYTT

BH0170A

TPM

ZXYTT

BH0170

TPM

ZXYTT

BH0370

TPM

F – Fairchild Logo

Z – Plant Code 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

Figure 4. Pin Configuration and Top Mark Information

Pin Definitions

Pin # Name Description

1 GND

2 VDD

3 FB

5 HV

6 Drain

7 Drain

8 Drain

VIN

NC No Connection for FSBH0F70A, FSBH0170A and FSBH0270A.

Ground. SenseFET source terminal on primary side and internal controller ground. Power Supply. The internal protection circuit disables PWM output as long as V

OVP trigger point.

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.

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.

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. SenseFET Drain. High-voltage power SenseFET drain connection. SenseFET Drain. High-voltage power SenseFET drain connection.

exceeds the

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. Unit

Drain Pin Voltage

DRAIN

IDM Drain Current Pulsed

EAS Single Pulsed Avalanche Energy

VDD DC Supply Voltage 30 V

VFB FB Pin Input Voltage -0.3 7.0 V

VIN VIN Pin Input Voltage -0.3 7.0 V

VHV HV Pin Input Voltage 700 V

Power Dissipation (T

θJA Junction-to-Air Thermal Resistance 80

θJC Junction-to-Case Thermal Resistance 20

TJ Operating Junction Temperature Internally limited

Storage Temperature Range -55 +150

STG

TL Lead Temperature (Wave Soldering or IR, 10 Seconds) +260

ESD

Electrostatic Discharge Capability, All pins except HV pin

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

9. Internally Limited of T

(5,6)

FSBH0x70/A 700 V

FSBH0F70A 1.5

(7)

FSBH0170/A 4.0

FSBH0270/A 8.0

FSBH0370 12.0

FSBH0F70A 10

(8)

FSBH0170/A 50

FSBH0270/A 140

FSBH0370 230

＜50°C) 1.5 W

°C/W

(9)

°C

= 25°C.

refers to T

OTP

Human Body Model: JESD22-A114

Charged Device Model: JESD22-C101

FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 — Green Mode Fairchild Power Switch (FPS™)

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

TA Operating Ambient Temperature -40 +105 °C

FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 — Green Mode Fairchild Power Switch (FPS™)

Electrical Characteristics

VDD=15V and TA=25°C unless otherwise specified.

Symbol Parameter Condition Min. Typ. Max. Unit

SenseFET Section

DSS

DS(ON)

Input Capacitance

ISS

Output Capacitance

OSS

RSS

Turn-On Delay Time

D(ON)

tR Rise Time

Turn-Off Delay Time

D(OFF)

tF Fall Time

(10)

Drain-Source Breakdown Voltage

Zero-Gate-Voltage Drain Current

Drain-Source OnState Resistance

(11)

Reverse Transfer Capacitance

FSBH0x70/A VDS = 700V, VGS = 0V 700 V

= 700V, VGS = 0V 50

FSBH0x70/A

FSBH0F70A

FSBH0170/A 8.80 11.00

FSBH0270/A 6.00 7.20

VDS = 560V, VGS = 0V, T

= 125°C

= 10V, ID = 0.5A

200

14.00 19.00

μA

Ω

FSBH0370 4.00 4.75

FSBH0F70A

FSBH0170/A 250 325

FSBH0270/A 550 715

VGS = 0V, VDS = 25V, f = 1MHz

162 211

FSBH0370 315 410

FSBH0F70A

FSBH0170/A 25 33

FSBH0270/A 38 50

VGS = 0V, VDS = 25V, f = 1MHz

18 24

FSBH0370 47 61

FSBH0F70A

FSBH0170/A 10.0 15.0

FSBH0270/A 17.0 26.0

= 0V, VDS = 25V,

f = 1MHz

3.8 5.7

FSBH0370 9.0 24.0

FSBH0F70A

FSBH0170/A 12.0 34.0

FSBH0270/A 20.0 50.0

VDS = 350V, ID = 1.0A

9.5 29.0

FSBH0370 11.2 33.0

FSBH0F70A

FSBH0170/A 4 18

FSBH0270/A 15 40

VDS = 350V, ID = 1.0A

19 48

FSBH0370 34 78

FSBH0F70A

FSBH0170/A 30.0 70.0

FSBH0270/A 55.0 120.0

VDS = 350V, ID = 1.0A

33.0 76.0

FSBH0370 28.2 67.0

FSBH0F70A

FSBH0170/A 10 30

FSBH0270/A 25 60

VDS = 350V, ID = 1.0A

42 94

FSBH0370 32 74

Continued on the following page…

FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 — Green Mode Fairchild Power Switch (FPS™)

Electrical Characteristics (Continued)

VDD=15V and TA=25°C unless otherwise specified.

Symbol Parameter Condition Min. Typ. Max. Unit

Control Section VDD Section

Start Threshold Voltage 11 12 13 V

DD-ON

Minimum Operating Voltage 7 8 9 V

DD-OFF

FSBH0170

Startup Current

DD-ST

Operating Supply Current VDD = 15V, VFB = 3V 3.0 3.5 4.0 mA

DD-OP

Operating Current for VFB<V

DD-ZDC

Internal Sink Current

DD-OLP

TH-OLP

VDD Over-Voltage Protection 27 28 29 V

DD-OVP

D-VDD-OVP

HV Section

FSBH0270 FSBH0370

FSBH0F70A FSBH0170A FSBH0270A

FB-ZDC

Off Voltage 5 6 7 V

DD-OLP

VDD Over-Voltage Protection Debounce Time

– 0.16V 30

DD-ON

µA

– 0.16V 240 320 400

DD-ON

VDD = 12V, VFB = 1.6V 1.5 2.5 3.5 mA

TH-OLP

+0.1V

30 70 90 µA

75 130 200 µs

IHV Maximum Current Drawn from HV Pin

Leakage Current after Startup

HV-LC

HV 120VDC, V

= 0V with 10µF

HV = 700V, V

= V

DD-OFF

+1V

1.5 3.5

5.0 mA

1 20 µA

Oscillator Section

Frequency in Nominal Mode

OSC

Green-Mode Frequency 14 18 22 kHz

OSC-G

Maximum Duty Cycle 85 %

MAX

Center Frequency

94 100 106 kHz

fDV Frequency Variation vs. VDD Deviation VDD = 11V to 22V 5 %

fDT

Frequency Variation vs. Temperature Deviation

(10)

= -25 to 85°C

5 %

VIN Section (FSBH0170, FSBH0270, FSBH0370)

PWM Turn-On Threshold Voltage

IN-ON

PWM Turn-Off Threshold Voltage

IN-OFF

PWM Turn-Off Debounce Time

IN-OFF

Pull-HIGH Latch Trigger Level

IN-H

Pull-HIGH Latch Debounce Time

IN-H

IN-L

Pull-LOW Auto-Recovery Trigger Level

1.08 1.13 1.18 V

–

IN-ON

0.48

IN-ON

0.54

IN-ON

0.60

500

4.4 4.7 5.0

100

0.2 0.3 0.4

Feedback Input Section

FB Voltage to Current-Sense Attenuation

1/4.5 1/4.0 1/3.5 V/V

ZFB Input Impedance 4 7 kΩ

–

µs

Continued on the following page…

FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 — Green Mode Fairchild Power Switch (FPS™)

Electrical Characteristics (Continued)

VDD=15V and TA=25°C unless otherwise specified.

Symbol Parameter Condition Min. Typ. Max. Unit

Current-Sense Section

Constant Power Limit (FSBH0170, FSBH0270, FSBH0370)

Current Limit (FSBH0F70A, FSBH0170A, FSBH0270A)

Over-Temperature Protection Section (OTP)

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

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

Output High Voltage FB Pin Open 5.5 V

FB-OPEN

Green-Mode Entry FB Voltage 2.3 2.5 2.7 V

FB-N

Green-Mode Ending FB Voltage 1.9 2.0 2.1 V

FB-G

Zero Duty Cycle FB Voltage

FB-ZDC

FB-OLP

D-OLP

Trigger Level

FB Open-Loop Protection Delay 50 56 59 ms

(14)

FB Open-Loop

FSBH0F70A 5.2 5.4 5.6 V

FSBH0x70/A 4.4 4.6 4.8 V

FSBH0F70A V

Peak Current Limit

LIM

FSBH0170/A VIN = 1.2V / VIN Open 0.70 0.80 0.90

FSBH0270/A VIN = 1.2V / VIN Open 0.90 1.00 1.10

Open 0.63 0.73 0.83

1.6

FSBH0370 VIN = 1.2V 1.10 1.20 1.30

tSS Period During Soft-Start Time

Threshold Voltage 1 for Current Limit

LMT1

LMT2

LMT

OTP

RESTART

Threshold Voltage 2 for Current Limit VIN = 3.6V 0.56 0.63 0.70 V

Threshold Voltage for Current Limit

Protection Junction Temperature

Restart Junction Temperature

(10)

4.5 5.0 5.5 ms

VIN = 1.2V 0.73 0.80 0.87 V

FSBH0F70A 0.97 1.00 1.03 V

FSBH0170A/0270A

(10, 12)

+135 +142 +150 °C

(10, 13)

0.77 0.80 0.83 V

-25 °C

OTP

protection has been activated.

PWM Frequency

OSC

OSC-G

FB-ZDC

FB-G

FB-N

Figure 5. V

vs. PWM Frequency

Typical Characteristics (Continued)

FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 Green — Mode Fairchild Power Switch (FPS™)

(µA )

DD-ST

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature(°C)

Figure 6. I

12.4

12.2

12.0

(V)

11.8

DD-ON

11.6

11.4

11.2

-40 -25 -10 5 20 35 50 65 80 95 110 125

Figure 8. V

vs. Temperature Figure 7. I

DD-ST

Temperature(°C)

vs. Temperature Figure 9. V

DD-ON

3.02

3.00

2.98

2.96

(µA )

2.94

DD-OP

2.92

2.90

2.88

2.86

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature(°C)

vs. Temperature

DD-OP

8.3

8.2

8.1

(V)

8.0

DD-OFF

7.9

7.8

7.7

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature(°C)

vs. Temperature

DD-OFF

6.6

6.4

6.2

6.0

(V)

5.8

TH-OLP

5.6

5.4

5.2

5.0

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature(°C)

(V)

DD-OVP

28.42

28.41

28.40

28.39

28.38

28.37

28.36

28.35

Figure 10. V

4.0

3.5

3.0

2.5

(mA)

2.0

1.5

1.0

-40 -25 -10 5 20 35 50 65 80 95 110 125

vs. Temperature Figure 11. V

TH-OLP

(µA)

HV-LC

Temperature(°C)

Figure 12. IHV vs. Temperature Figure 13. I

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature(°C)

vs. Temperature

DD-OVP

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature(°C)

vs. Temperature

HV-LC

Typical Characteristics (Continued)

FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 — Green Mode Fairchild Power Switch (FPS™)

101.5

101.0

100.5

100.0

(kHz)

99.5

OSC

99.0

98.5

98.0

97.5

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature(°C)

Figure 14. f

0.64

0.63

0.62

(V)

0.61

IN-OFF

0.60

0.59

0.58

-40 -25 -10 5 20 35 50 65 80 95 110 125

Figure 16. V

vs. Temperature Figure 15. f

OSC

Temperature(°C)

vs. Temperature Figure 17. V

IN-OFF

19.2

19.1

19.0

(kHz )

18.9

OSC-G

18.8

18.7

18.6

-40 -25 -10 5 20 35 50 65 80 95 11 0 125

Temperature(°C)

vs. Temperature

OSC-G

1.17

1.16

1.15

(V)

1.14

IN-ON

1.13

1.12

1.11

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature(°C)

vs. Temperature

IN-ON

4.63

4.62

4.61

(V)

4.60

IN-H

4.59

4.58

4.57

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature(°C)

Figure 18. V

4.75

4.70

4.65

4.60

(V)

4.55

FB-OLP

4.50

4.45

4.40

4.35

-40 -25 -10 5 20 35 50 65 80 95 110 125

Figure 20. V

vs. Temperature Figure 19. V

IN-H

Temperature(°C)

vs. Temperature Figure 21. V

FB-OLP

0.34

0.33

0.32

(V)

0.31

IN-L

0.30

0.29

0.28

-40 -25 -10 5 20 35 50 65 80 95 110 125

2.60

2.55

2.50

(V)

2.45

FB-N

2.40

2.35

2.30

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature(°C)

vs. Temperature

IN-L

Temperature(°C)

vs. Temperature

FB-N

Typical Characteristics (Continued)

FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 — Green Mode Fairchild Power Switch (FPS™)

2.20

2.15

2.10

2.05

(V)

2.00

FB-G

1.95

1.90

1.85

1.80

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature(°C)

Figure 22. V

2.56

2.54

2.52

2.50

(mA)

2.48

DD-ZDC

2.46

2.44

2.42

-40 -25 -10 5 20 35 50 65 80 95 110 125

Figure 24. I

vs. Temperature Figure 23. V

FB-G

Temperature(°C)

vs. Temperature Figure 25. t

DD-ZDC

1.800

1.700

1.600

(V)

1.500

FB-ZDC

1.400

1.300

1.200

-40 -25 -10 5 20 35 50 65 80 95 110 125

55.0

54.5

54.0

53.5

(ms )

53.0

D-OLP

52.5

52.0

51.5

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature(°C)

vs. Temperature

FB-ZDC

Temperature(°C)

vs. Temperature

D-OLP

Functional Description

FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 — Green Mode Fairchild Power Switch (FPS™)

Startup Operation

The HV pin is connected to bulk voltage through an external resistor, R

, 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 exceeds the turn-on threshold voltage (V

capacitor until VDD voltage

DD-ON

). For better power consumption, the HV startup circuit shuts down during normal operation. The external V capacitor and auxiliary winding maintain the V

voltage

and provide operating current to controller.

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 a built-in, synchronized, positive slope for each switching cycle.

Brown-In/Out Funct i on

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 linevoltage 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 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:

Brownout with PFC:

RRR

ABC

20.6

⋅⋅=

AC OUT

Brownout with non-PFC:

(1)

Soft-Start

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 level slopes up like a six-step staircase. In doing so, power system can smoothly build up the rated output

level is shown in Figure 27. The V

LMT

RRR

ABC

⋅=

20.6

AC OUT

Brown-in level is determined by:

RRR

AC IN

1.1

=⋅

(2)

(3)

voltage and effectively reduce voltage stress on the PWM switch and output diode.

Figure 27. Soft-Start Function

Figure 29. V

Level According to PFC Operation

FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 — Green Mode Fairchild Power Switch (FPS™)

Brown-In Function of FSBH0x70A

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

to ground

during startup. The HV source current must be larger than I brown-in level can be determined by R

to charge the capacitor of VDD. Therefore, the

DD-ST

according to

the equation:

212

−

DD ST

−

(4)

Green-Mode Operation

The FSBH-series uses feedback voltage (V 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

decreases below V

PWM frequency starts to linearly decrease from 100kHz to 18kHz for reducing switching losses. As V decreases below V

(2.0V), the switching frequency is

FB-G

fixed at 18kHz and FSBH-series enters “deep” green mode to reduce the standby power consumption.

Figure 30. PWM Frequency

As VFB decreases below V

(1.6V), FSBH-series

FB-ZDC

enters into burst-mode operation. When V below V

, FSBH-series stops switching and the

FB-ZDC

output voltage starts to drop, which causes the feedback voltage to rise. Once V

rises above V

switching resumes. Burst mode alternately enables and disables switching, thereby reducing switching loss to improve power saving, as shown in Figure 31.

) as an

(2.5V), the

FB-N

drops

FB-ZDC

H/L Line Over-Power Compensation

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.

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 overpower compensation, the FSBH0170/0270/0370 has additional protections via the VIN pin, such as pullHIGH latch and pull-LOW auto-recovery that depends on the application. As shown in Figure 33, V higher than 4.7V, FSBH-series is latched until the V discharged. FSBH-series is auto-recovery when the V level is lower than 0.3V.

Figure 33. VIN Pin Function

level is

When the upper branch of the voltage divider for the shunt regulator (KA431 shown) is broken, as shown in

Open-Loop / Overload Protection (OLP)

FB.ZDC

(1.6V)

Drain

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.

When feedback voltage is above 4.6V for longer than 56ms, OLP is triggered. This protection is also triggered

Switching

Disabled

Switching

Disabled

Figure 31. Burst-Mode Operation

when the SMPS output drops below the nominal value longer than 56ms due to the overload condition.

Feedback Open

KA431

Loop

Figure 34. OLP Operation

4.6V

FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 — Green Mode Fairchild Power Switch (FPS™)

VDD Over-Voltage Protection (OVP)

VDD over-voltage protection prevents IC damage caused by over voltage on the VDD pin. The OVP is triggered

PWM

when V 130µs) prevents false trigger by switching noise.

Over-Temperature Protection (OTP)

The SenseFET and the control IC are integrated, making it easier to detect the temperature of the SenseFET. When the temperature exceeds approximately 142

56ms

OLP

voltage reaches 28V. Debounce time (typically

°C, thermal shutdown is activated.

Physical Dimensions

FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 Green — Mode Fairchild Power Switch (FPS™)

9.83

9.00

6.67

6.096

8.255

7.61

5.08 MAX

0.33 MIN

(0.56)

2.54

7.62

0.56

0.355

3.60

3.00

1.65

1.27

3.683

3.20

0.356

0.20

7.62

9.957

7.87

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

ES PER

ASME Y14.5M-1994

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. Pl ease note the revision and/or date on t he drawing and contact a Fairchild S emiconductor 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.

Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:

http://www.fairchildsem i.com/p ackagi ng/

FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 — Green Mode Fairchild Power Switch (FPS™)

Datasheet FSBH0F70A, FSBH0170, FSBH0170A, FSBH0270, FSBH0270A Datasheet (Fairchild)

Specifications and Main Features

Frequently Asked Questions

User Manual