FAN7554_技术文档

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April 2016

FAN7554

Versatile PWM Controller

Description

Features

The FAN7554 is a fixed frequency current mode PWM

controller. It is specially designed for off-line and DC to

DC converter applications with minimal external

.

Current mode control

Pulse-by-Pulse Current Limiting

Low External Components

components. These integrated circuits feature

a

trimmed oscillator for precise duty cycle control, a

temperature compensated reference, an ON/OFF

control, a high gain error amplifier, a current sensing

comparator, and a high current totem-pole output. The

FAN7554 has various protection functions such as an

overload protection, an over-current protection, and the

over-voltage protection, which include built-in auto

restart circuit. The FAN7554 is available in the 8-DIP

package.

Under-Voltage Lockout(UVLO): 9 V/15 V

Stand-by Current: Typical: 100 µA

Power Saving Mode Current: Typical: 200 µA

Operating Current: Typical. 7 mA

Soft-Start

On/Off Control

Overload Protection (OLP)

Over-Voltage Protection (OVP)

Over-Current Protection (OCP)

Over-Current Limit (OCL)

Operating Frequency up to 500 kHz

1 A Totem-Pole Output Current

Figure 1.

8-Dip Package

Applications

.

Off-Line & DC-DC Converter

Ordering Information

Operating

Temperature Range

Part Number

Package

8-Lead Dual Inline Package (DIP)

Packing Method

FAN7554

-25 to 85°C

Rail

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FAN7554 • Rev. 4.1

Block Diagram

Figure 2.

Block Diagram

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FAN7554 • Rev. 4.1

2

Pin Configuration / Marking Information

Figure 3.

Pin Assignment (Top Through View)

Pin Descriptions

Pin #

Pin Name

Description

1

2

3

4

5

6

7

8

FB

S/S

Inverting(-) Input of pwm Comparator, On/Off Control & OLP Sensing Terminal

Soft-Start

IS

Non-inverting(+) Input of PWM Comparator, OCL Sensing Terminal

Rt/Ct

GND

OUT

V_CC

Oscillator Time Constant (Rt/Ct)

Ground

Output of Gate Driver

Power Supply

V_REF

Output of 5 V Reference

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FAN7554 • Rev. 4.1

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.

Symbol

Parameter

Min.

Max.

Unit

V_CC

I_O

Supply Voltage

30

±1

V

A

Output Current

V_FB

V_IS

Input Voltage to FB Pin

Input Voltage to IS Pin

-0.3 to V_SD

-0.3 to V_OC

0.85

V

P_D

W

Power Dissipation at T_A25°C

Operating Temperature

T_OPR

T_STG

-25

-55

85

°C

°C/W

Storage Temperature

Thermal Resistance, Junction-to-Air⁽¹⁾

150

147.8

R_

JA

Note:

1. Junction -to -air thermal resistance test environments:

- JESD51-2: Integrated circuits thermal test method environmental conditions-natural convection (still air).

- JESD51-3: Low effective thermal conductivity test board for leaded surface mount packages.

Temperature Characteristics

Symbol

Parameter

Min.

Max.

±0.5

±5

Unit

%

V_REFTemperature Stability

f_OSCTemperature Stability

V_REF

f_OSC

3

%

2

www.fairchildsemi.com

FAN7554 • Rev. 4.1

4

Electrical Characteristics

Unless otherwise specified, T_A= 25C, V_CC=16 V, Rt=10 k, Ct=3.3 nF.

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Unit

Reference Section

V_REF

V_REF

I_SC

Reference Output Voltage

Line Regulation

T_J=25°C, I_REF= 1 mA

V_CC= 12 V ~ 25 V

4.90

5.00

6

5.10

20

V

mV

A

1

2

Load Regulation

I_REF= 1 mA ~ 20 mA

6

25

Short-Circuit Output Current T_J= 25°C

0.10

0.18

Oscillator Section

f_OSC

f_OSC1

V_RH

Oscillation Frequency

T_J= 25°C

Frequency Change with V_CCV_CC= 12 V ~ 25 V

Ramp High Voltage

45

50

0.05

2.8

55

kHz

%

1.00

V

V_RL

Ramp Low Voltage

1.2

V

I_disch

Discharge Current

V_RT/CT= 3.3 V

V_FB= 5 V

6.1

9.4

mA

PWM Section

V_TH(IS)

V_TH(FB)

I_FB

Sense Threshold Voltage

0.8

0.2

1.0

0.3

1.0

95

1.2

0.4

V

Feedback Threshold Voltage V_IS= 0 V

Feedback Source Current

Max. Duty Cycle

V_FB= 0 V, V_S/S= 5 V

mA

%

D_(MAX)

D_(MIN)

92

98

0

Min. Duty Cycle

%

Protection Section

I_SD

V_SD

V_OC

V_OVP

Shutdown Delay Current

Shutdown Feedback Voltage V_FB> 5 V

3.5

5.4

1.6

30

5.0

6.0

2.0

34

6.5

6.6

2.4

38

µA

V

4 V ≤V_FB≤V_SD

Over-Current Protection

Over-Voltage Protection

V_IS> 1.5 V, t_ON> 500 nS

V

ON/OFF Control Section

I_SINKOff Mode Sink Current

V_OFFOff Threshold Voltage

Soft-Start Section

V_FB< V_TH(FB), V_S/S= 5 V

V_FB< V_TH(FB)

4

mA

V

1.2

1.5

1.8

I_S/S

Soft-Start Current

Soft-Start Limit Voltage

V_FB= 5 V, V_S/S= 0 V

V_CC= 16 V

1.1

5.2

mA

V

V_LIM(S/S)

Continued on the following page…

www.fairchildsemi.com

FAN7554 • Rev. 4.1

5

Electrical Characteristics (Continued)

Unless otherwise specified, T_A= 25C, V_CC=16 V, Rt = 10 k, Ct = 3.3 nF.

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Unit

Output Section

V_OL1

V_OH1

V_OL2

V_OH2

t_R

Low Output Voltage1

High Output Voltage1

Low Output Voltage2

High Output Voltage2

Rise Time⁽²⁾

V_CC= 18 V, I_O= 50 mA

V_CC= 18 V, I_O= -50 mA

V_CC= 18 V, I_O= 200 mA

V_CC= 18 V, I_O= -200 mA

T_J= 25°C, C_L= 1 nF

0.15

15

0.40

17

V

13

12

1.5

14

2.5

16

V

80

ns

t_F

Fall Time ⁽²⁾

T_J= 25°C, C_L= 1 nF

40

UVLO Section

V_TH(ST)Start Threshold Voltage

V_OPR(M)Min. Operating Voltage

Total Standby Current Section

13.2

8.2

15.0

9.0

16.2

10.2

V

I_ST

I_OP

Startup Current

0.1

7

0.2

10

mA

Operating Supply Current

Off-State Current

I_OFF

V_FB<V_TH(FB),V_S/S<V_OFF

0.2

0.4

Note:

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

www.fairchildsemi.com

FAN7554 • Rev. 4.1

6

Typical Performance Characteristics

Figure 4.

Rt vs. Frequency

Figure 5.

Ct vs. Dead Time

Figure 6.

Ct vs. Duty

Figure 7.

Cload vs. t_R& t_F

Figure 8.

Temperature vs. Startup Current

Figure 9.

Temperature vs. Operating Supply

Current

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FAN7554 • Rev. 4.1

7

Typical Performance Characteristics

Figure 10. Temperature vs. Reference Voltage

Figure 11. Temperature vs. Oscillation Frequency

Figure 12. Temperature vs. Start Threshold Voltage Figure 13. Temperature vs. Min. Operating Voltage

www.fairchildsemi.com

FAN7554 • Rev. 4.1

8

Operation Description

The FAN7554 has all the basic features of the current

mode SMPS control IC. Its basic configuration includes

the UVLO with 6 V hysteresis, a band gap reference,

the oscillator that can oscillate up to 500 kHz according

to R_t/C_t(connected externally), a PWM logic circuit, a

gate driver, and the feedback circuit that has the current

source and soft start function. The FAN7554 has

various functions such as an overload protection, an

over current protection, and an over-voltage protection.

The overload protection forces the FAN7554 to stop its

operation if the load current is higher than the preset

value. The protection circuit can also be prevented from

operating during transient states by ensuring that a

certain amount of the time passes before the protection

circuit operates. The shutdown circuit is configured for

an auto-restart, so the FAN7554 automatically restarts

when V_CCdrops to 9 V (stop voltage).

Figure 15. Startup & Circuit Characteristics

Soft Start

The SMPS output load usually contains a capacitive

load component. During initial startup, the output

voltage increases at a fixed time constant because of

this component. If the feedback loop, which controls the

output voltage, was to start without the soft-start circuit,

the feedback loop would appear to be open during initial

startup, so, at startup, the feedback voltage applied to

the PWM comparator’s inverting input (-) reaches its

maximum value (1 V).

Startup

The startup circuit is made up of an Under-Voltage

Lockout (UVLO), the protection for low voltage

conditions, and the 5 V reference (V_REF), which supplies

bias voltage to the control circuit after startup. The start

voltage of the UVLO is 15 V, and the stop voltage after

turn on is 9 V. It has a 6 V hysteresis. The minimum

operating current for startup threshold is typically

100 µA, and this can reduce the power dissipation on

the startup resistor. The V_REFis composed of the band

gap reference circuit with its superior temperature

characteristics and supplies power to all the FAN7554

circuits and R_t/C_t, with the exceptions of the ULVO

circuit and ON/OFF control circuit.

During this time, the peak value of the drain current

would stay at the maximum value, and the maximum

power would be delivered to the secondary load side

from the start. When the maximum power is delivered to

the secondary side for this initial fixed time, the entire

circuit is seriously stressed. The use of a soft-start can

avoid such stresses. At startup, the soft-start capacitor

C_Sis charged by 1 mA and 100 µA current sources.

The voltage of the inverting terminal of the PWM

comparator increases to 1/3 of the C_Svoltage at a fixed

time constant. Subsequently, the drain peak current is

limited by the gradual increase in the C_Svoltage and

this causes the output voltage to increase smoothly.

When the C_Svoltage becomes greater than 3 V, the

diode D_Sturns off consequently, the feedback capacitor

C_FBis charged by 1 mA and 5 µA current sources. This

charge voltage determines the comparator’s inverting

voltage. Then, C_Svoltage charges to 5 V by 100 µA

current source. The soft start capacitor C_Sis discharged

when the UVLO good logic starts, so the soft start is

repeated at re-start.

Figure 14. Low Current Startup & Bandgap

Reference Circuit

Figure 16. Soft Start Circuit & Circuit Flow

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FAN7554 • Rev. 4.1

9

Oscillator

As shown in Figure 17, the oscillator frequency is

programmed by values selected for timing components

R_tand C_t. Capacitor C_tis charged to almost 2.8 V

through resistor R_tfrom the 5 V reference and

discharged to 1.2 V by an internal current source. The

oscillator generates the clock signal while the timing

capacitor C_tis discharged. The gate drive output

becomes low during the clock time. R_tand C_tselection

determine the oscillator frequency and maximum duty

cycle. Charge and discharge times can be calculated

through the equations below.

Charging Time: t_c= 0.55 x R_tx C_t

Figure 18. Sawtooth & Clock Waveform

Discharging Time: t_d= R_tx C_tx ln[(0.0063 x R_t- 2.8) /

(0.0063 x R_t- 3.8)]

Where the oscillator frequency: f_OSC= (t_c+ t_d)^-1(±10%).

Feedback

As shown in Figure 16, the internal oscillator clock turns

on the MOSFET. The feedback comparator operates to

turn it off again, when the MOSFET current reaches a

set value proportional to V_FB. The feedback capacitor

C_FBis charged by the internal current sources, 1 mA

and 5 µA, and is discharged by the secondary side

photo-coupler to control the output voltage.

When R_t> 5 kΩ, fosc = 1 / (0.55 x R_tx C_t) = 1.8 / (R_tx C_t).

Figure 17. Oscillator Circuit

Figure 19. Feedback & PWM Circuit

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FAN7554 • Rev. 4.1

10

charged by the 5 µA current source because diode D1

turns off. When the feedback voltage is less than 3 V,

the charge slope becomes an exponential function and,

when it is greater than 3 V, the charge slope becomes

linear. When the feedback voltage reaches almost 6 V,

the FAN7554 shuts down. The shut down circuit is

configured for auto-restart, so it automatically restarts

when V_CCreaches the under voltage 9 V.

Delayed Shutdown

During the normal operation, the feedback voltage is

between 0~3 V. If the output terminal overloads or an

error happens to the feedback loop, the delayed

shutdown circuit operates. When the feedback voltage

is less than 3 V, the feedback capacitor is charged by

current sources, 1 mA and 5 µA; when the feedback

voltage becomes greater than 3 V, the capacitor is

Figure 20. Delayed Shutdown & Feedback Circuit

Figure 21. Delayed Shutdown & Feedback Waveform

Gate Driver

The gate drive circuit has the totem-pole output configuration. The output has 1 A peak current and 200 mA average

current drive ability.

www.fairchildsemi.com

FAN7554 • Rev. 4.1

11

ON/OFF Control

The FAN7554 is able to use the feedback pin for

ON/OFF control by placing NPN transistor between the

cathode of the KA431 and ground as shown in Figure

23. When the transistor turns on, the current flows

through the photo diode and saturates the photo

transistor. As a result, the feedback voltage is dropped

to zero. When the feedback voltage is below 0.3 V, the

soft start voltage starts to discharge by connecting the

internal resistor 1 kΩin parallel with the external

capacitor Cs. When the soft-start voltage becomes less

than 1.5 V, all the blocks in the FAN7554 are turned off,

with the exceptions of the UVLO block and ON/OFF

control block. The operation current is about 200 µA. So

the stand-by power is reduced and SMPS efficiency is

improved. When the feedback voltage exceeds 0.3 V,

the FAN7554 normally operates by turning on V_REF

block.

Figure 22. Gate Drive Circuit

Figure 23. ON/OFF Control Circuit

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FAN7554 • Rev. 4.1

12

Figure 24. ON-OFF Control Circuit Waveform

Protection Circuits

Overload Protection

The FAN7554 has many built-in protection circuits that

do not need additional components, providing reliability

without cost increase. These protection circuits have the

auto-restart configuration. In this configuration, the

protection circuits reset when V_CCis below UVLO stop

threshold (9 V) and restarts when V_CCis above UVLO

start threshold voltage (15 V)

An overload is the state in which the load is operating

normally but in excess of the preset load. The overload

protection circuit can force the FAN7554 to stop its

operation. The protection can also operate in transient

states such as initial SMPS operation. Because the

transient state returns to the normal state after a fixed

time, the protection circuit need not to operate during

this time. That is, the FAN7554 needs the time to detect

and decide whether it is an overload condition or not.

The protection circuit can be prevented from operating

during transient states by ensuring that a certain amount

of time passes before the protection circuit operates.

The above operations are executed as follows: Since

the FAN7554 adopts a current mode, it is impossible for

current to flow above a maximum level. For a fixed input

voltage, this limits power. Therefore, if the power at the

output exceeds this maximum, V_O, shown in Figure 25,

becomes less than the set voltage, and the KA431pulls

in only the given minimum current. As a result, the

photo-coupler’s secondary side current becomes zero.

The same goes for the photo-coupler’s primary side

current. Consequently, when the full current 1 mA flows

through the internal resistor (2R + R = 3R), V_FB

becomes approximately 3 V and from that time, the 5 µA

current source begins to charge C_FBthe photo-coupler’s

secondary current is almost zero. The FAN7554 shuts

down when V_FBreaches 6 V.

Over Voltage Protection

Abnormalities may occur in the SMPS secondary side

feedback circuit. First, when the feedback pin is short to

the ground, the feedback voltage is zero and the

FAN7554 is unable to start switching. Second, when the

feedback circuit is open, the secondary voltage

generally becomes much greater than the rated voltage

as the primary side continues to switch at the maximum

current level. This may cause the blowing off the fuse

or, in serious cases, fires. It is possible that the devices

directly connected to the secondary output without a

regulator could be destroyed. Even in these cases, the

over voltage protection circuit operates. Since V_CCis

proportional to the output, in an over voltage situation, it

also will increase. In the FAN7554, the protection circuit

operates when V_CCexceeds 34 V. Therefore, in normal

operation, V_CCmust be set below 34 V.

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FAN7554 • Rev. 4.1

13

Figure 25. Delayed Shutdown

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FAN7554 • Rev. 4.1

14

FAN7554 Flyback Converter Demo Circuit (f_SW: 100 kHz)

Table 1. Part List For FAN7554 Flyback Converter Demo Board

Part

FUSE

NTC

Value

Fuse

Note

Part

Value

Note

Capacitor

100 nF/275 V

470 nF/400 WV

103/1 kV

C101

C102

C103

C104

Box Capacitor

250 2 A

NTC

Electrolytic

5D-11

Film Capacitor

Resistor

330 k

R101

R102

1 W

C105

C106

C107

C108

C109

C201

C202

C203

C301

C302

104

1 µF

Ceramic

Electrolytic

Ceramic

R103, R104

R105

101

100 k

22 k

4.7 k

12 k

10 k

1 k

122

Ceramic

R106

22 µF/50V

330 µF

104

Electrolytic

Ceramic

R107

R108

R109

R110

2 W

0.5 k

1 k

R201

R202

1 k

R203

4.7 k

Inductor

30 mH

R204

R205

LF101

L201

1.2 k

6.4 µH

MOSFET

Diode

Q101

Fairchild

D201

MBRF10100CT

UF4007

Fairchild

IC

IC101

IC201

IC301

Fairchild

D101

D103

BD

1N4148

FQP6N70

FAN7554

Opto-coupler

UF4004

G3SBA60

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FAN7554 • Rev. 4.1

15

Transformer Specification

Figure 26. Transformer Specification

Table 2. Winding Specification

No.

N_P

Pin (S→F)

Wire

Turns

44

Winding Method

0.35φ x 1

0.35φ x 4

0.35φ x 1

1 → 3

7 → 11

1 → 3

5 → 4

N_12V

V_P

12

44

N_B

14

Table 3. Electrical Characteristics

Closure

Specification

Remarks

Inductance

Leakage

1-3

400 µH ±10%

100 µH Max.

100 kHz, 1 V

2^ndAll Short

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FAN7554 • Rev. 4.1

16

FAN7554 Forward Converter Demo Circuit (f_SW: 100 kHz)

Table 4. Part List For FAN7554 Forward Converter Demo Board

Part

FUSE

RT101

Value

Fuse

Note

Part

Value

Note

Capacitor

470 nF/275 V

470 nF/400 WV

223/630 V

33 µF/35 V

104

C101

C102, C103

C104

Box Capacitor

Electrolytic

Film

250 2 A

NTC

DSC 10D-11

Resistor

330 k

C105

Film Capacitor

Ceramic

Electrolytic

Ceramic

Film

R101

R102

1 W

C106

C107

1 µF/35 V

101

R103, R104

R105, R106

R107

1 W

C108

56 k

220 k

C109

122

C110

272

10 k

R108

C111

333

Film

20 k

R109

C201,C202

C203

1000 µF/35 V

330 µF/16 V

2200 µF/16 V

104

Electrolytic

Ceramic

4.7 k

R110

1.2 k

R111

2 W

C204

0.5 0.5 0.5 

1 k

R112

C205

R113

C301, C302

332/1 kV

12 k

R201, R202

R203

10 k

Inductor

30 mH

LF101

L201

1 k

R204

330 

MOSFET

SSH8N80

IC

Diode

IN4004

Q101

Fairchild

D101

D102

D103

D201

D202

BD

FR157

IC101

IC201

IC301

Fairchild

UF4007

FAN7554

KA431

MBRF10100CT

MBR3045PT

PBS406GU

Opto-coupler

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FAN7554 • Rev. 4.1

17

Transformer Specification

Figure 27. Transformer Specification

Table 5. Winding Specification

No.

N_P

Pin (S→F)

1 → 3

Wire

Turns

32

4

0.65φ x 1

0.65φ x 4

0.65φ x 1

N_S, 5

N_S, 12

N_P

8 → 11

4 → 9

5

32

5

1 → 3

N_VCC

7 → 6

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FAN7554 • Rev. 4.1

18

9.83

9.00

8

5

6.670

6.096

1

4

8.255

7.610

TOP VIEW

1.65

1.27

(0.56)

7.62

3.683

3.200

5.08 MAX

3.60

3.00

0.33 MIN

0.356

0.200

15°

0°

0.560

0.355

2.54

9.957

7.870

7.62

FRONT VIEW

SIDE VIEW

NOTES:

A. 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 TOLERANCES PER ASME

Y14.5M-2009

E. DRAWING FILENAME: MKT-N08Frev3

ON Semiconductor and

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

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型号：	FAN7554
厂家：	ONSEMI
描述：	多功能 PWM 控制器 PC 控制器开关光电二极管
文件：	总21页 (文件大小：1093K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

FAN7554 [ONSEMI]

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