Datasheet FAN7601B Datasheet (Fairchild)

FAN7601B Green Current Mode PWM Controller

FAN7601B — Green Current Mode PWM Controller

May 2012

Features

 Green Current Mode PWM Control  Low Operating Current: Maximum 4mA  Burst Mode Operation  Internal High-Voltage Startup Switch  Under-Voltage Lockout (UVLO): 12V/8V  Latch Protection and Soft-Start Function  Over-Voltage Protection: 19V  Operating Frequency up to 300kHz  Maximum Duty Cycle: 95%

Applications

 Offline Adapter Applications  Auxiliary Power Supplies

Related Resources

 AN4129 — Green Current Mode PWM

Controller FAN7601

Description

The FAN7601B is a programmable frequency green current mode PWM controller. It is specially designed for the offline adapter applications and the auxiliary power supplies that require high efficiency at light load and no load. The internal high-voltage startup switch and burst mode reduce the power loss.

FAN7601B includes protections, such as latch protection and over-voltage protection. The latch protection can be used for over-voltage protection, thermal protection, and others. The soft-start prevents the output voltage overshoot at startup.

Ordering Information

Operating

Part Number

FAN7601BM FAN7601BMX 7601B 8-SOP Tape & Reel FAN7601BGX 7601B 10-SSOP Tape & Reel

Junction

Temperature

-40°C to +150°C

Top Mark Package Packing Method

7601B 8-SOP Rail

Block Diagram

R

t/Ct

(5)

V

REF

Latch/SS

(4)

3

OSC4

12µA

2.5V

FAN7601B — Green Current Mode PWM Controller

V

(10)

REF

5V Ref

1.5V OVP

+

−

Enable

S R

V

(1)

STR

18

V

CC

7

OVP

Startup

Circuit

UVLO

+

−

Q

Delay

Circuit

+

−

12V/8V

+

−

19V

(8)

OUT

6

(7)

+

−

1V

GND

5

(6)

Note:

1. ( ) is 10-SSOP Pin Number.

Startup

Circuit

Reset

Circuit

Figure 1. Internal Block Diagram

0.97V/0.9V

+

−

Latch/SS

−

1V

2

CS/FB

(3)

Pin Configurations

FAN7601B — Green Current Mode PWM Controller

Figure 2. 8-Pin Configuration (Top View) Figure 3. 10-Pin Configuration (Top View)

Pin Definitions

Pin # (8-Pin) Pin # (10-Pin) Name Description

1 1 V 2 3 CS/FB Current Sense and Feedback 3 4 Latch/SS Latch Protection and Soft-Start 4 5 Rt/Ct Oscillator Timing 5 6 GND Ground 6 7 Out Gate Drive Output 7 8 VCC IC Power Supply 8 10 V

Startup

STR

Voltage Reference

REF

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

VCC Supply Voltage 20 V

V

Input Voltage CS/FB -0.3 20.0 V

CS/FB

T

Storage Temperature -55 +150

STG

TJ Recommended Operating Junction Temperature -40 +150

IO Output Current 250 mA

V

STR

ESD

V

Input Voltage 500 V

STR

Electrostatic Discharge Capability

Human Body Model, JESD22-A114 2000 Charged Device Model, JESD22-C101 1500

°C °C

V

Thermal Impedance

FAN7601B — Green Current Mode PWM Controller

Symbol Parameter Value Unit

θ

JA

Thermal Resistance, Junction-to-Ambient

8-SOP 180

10-SSOP 130

°C/W

Electrical Characteristics

TA=-25°C~125°C, VCC=14V, RT=9.5kΩ, CT=2.2nF unless otherwise specified.

Symbol Parameter Conditions Min. Typ. Max. Unit

Reference Section

V

REF

ΔV

REF1

ΔV

REF2

Oscillator Section

f

OSC

ST

V

OSC

PWM Section

V

CS/FB1

D

MAX

D

MIN

Burst Mode Section

V

CS/FB2

V

CS/FB3

Soft-Start Section

ISS Soft-Start Current V

VSL Soft-Start Limit Voltage

Protection Section

V

LATCH

V

OVP

UVLO Section

V

tH

V

tL

Total Current Section

IOP Operating Supply Current 3 4 mA

Output Section

VOL Low Output Voltage

VOH High Output Voltage

tr Rising Time

tf Falling Time

Startup Section

Reference Output Voltage IO=1mA Line Regulation VCC=10V~18V Load Regulation IO=1mA ~ 10mA

4.85 5.00 5.15 V 10 20 mV 20 30 mV

Initial Accuracy 90 100 110 kHz Voltage Stability VCC=10V~18V

V

Amplitude V

pin4 peak-to-peak

1.0 1.5 %

1.25 V

CS/FB Threshold Voltage1 0.9 1.0 1.1 V Maximum Duty Cycle TA=25°C 92 95 98 % Minimum Duty Cycle 0 %

CS/FB Threshold Voltage2 CS/FB Threshold Voltage3

(2)

0.77 0.97 1.17 V

(2)

0.7 0.9 1.1 V

=GND 9 12 15

(3)

pin3

ISS=1μA

1.2 1.5 1.8 V

Latch Voltage 2.25 2.50 2.75 V Over-Voltage Protection 18 19 20 V

Start Threshold Voltage 11 12 13 V Minimum Operating Voltage 7 8 9 V

=25°C, IO=100mA

T

A

T

=25°C, IO=-100mA

(2)

A

TA=25°C, CI=1nF TA=25°C, CI=1nF

2.0 2.5 V

11.5 12.0 14.0 V 45 150 ns 35 150 ns

μA

FAN7601B — Green Current Mode PWM Controller

I

V

str

Startup Current V

STR

=30V, TA=25°C 0.5 1.0 1.5 mA

STR

Notes:

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

3. It is recommended to connect a 1MΩ resistor between the Latch/SS pin and GND to prevent abnormal operation of the latch protection by noise coupling.

Typical Performance Characteristics

c

5.05

5.03

5.01

(V)

Vref

4.99

4.97

4.95

-45 -25 -15 0 25 50 80 100 125 140

Junction Temperature(℃)

Figure 4. Trimmed Reference Voltage Figure 5. Supply Current

13

12.5

12

11.5

(V)

11

10.5

Vcc Star t Thresh old VtH

10

-45 -25 -15 0 25 50 80 100 125 140

Junction Temperature(℃)

Figure 6. VCC Start Threshold Voltage Figure 7. VCC Stop Threshold Voltage

FAN7601B — Green Current Mode PWM Controller

3

2.5

2

1.5

(mA)

1

Supply Current Icc

0.5

0

-45 -25 -15 0 25 50 80 100 125 140

Junction Temperature(℃)

9

8.5

8

(V)

7.5

Vcc Stop Threshold VtL

7

-45 -25 -15 0 25 50 80 100 125 140

Junction Temperature(℃)

110

105

100

95

(KHz)

90

Oscillator Frequency Fos

85

-45 -25 -15 0 25 50 80 100 125 140

Junction Temperature(℃)

100

98

96

94

(%)

92

90

Maximum Duty Cycle Dmax

-45 -25 -15 0 25 50 80 100 125 140

Junction Temperature(℃)

Figure 8. Oscillator Frequency Figure 9. Maximum Duty Cycle

2.7

2.6

2.5

(V)

2.4

2.3

Oscillator High Threshold VrH

-45 -25 -15 0 25 50 80 100 125 140

Junction Temperature(℃)

1.35

1.3

1.25

(V)

1.2

1.15

Oscillator Low Threshold VrL

-45 -25 -15 0 25 50 80 100 125 140

Junction Temperature(℃)

Figure 10. Oscillator High Threshold Voltage Figure 11. Oscillator Low Threshold Voltage

p

h

f

]

Typical Performance Characteristics (Continued)

FAN7601B — Green Current Mode PWM Controller

2

1.6

1.2

0.8

(mA)

0.4

Start up Current Istr

0

-45 -25 -15 0 25 50 80 100 125 140 Junction Temperature(℃)

Figure 12. Startup Current

2.8

2.7

2.6

2.5

(V)

2.4

2.3

Latch Protection Vlatc

2.2

-45 -25 -15 0 25 50 80 100 125 140 Juncti on Temperatu re(℃)

Figure 14. Latch Protection Voltage

20

19.6

19.2

(V)

18.8

18.4

18

Over Voltage Prot ection Vov

-45 -25 -15 0 25 50 80 100 125 140 Junctio n Temperature( ℃)

Figure 13. Over-Voltage Protection Level

14

13

12

11

(uA)

10

Soft Start Current Iso

9

-45 -25 -15 0 25 50 80 100 125 140 Junction Temperature(℃)

Figure 15. Soft-Start Current

1000

Ct=

10nF

100

Frequency[KHz

10

1

5K 15K 25K 35K 45K

Rt[Kohm]

8.2nF

4.7nF

3.3nF

2.2nF 1nF 820pF 680pF

Figure 16. Oscillator Frequency Characteristic

Physical Dimensions

8

5.00

4.80

3.81

FAN7601B — Green Current Mode PWM Controller

A

0.65

5

B

6.20

5.80

4.00

1.75

5.60

3.80

PIN ONE

INDICATOR

(0.33)

1

0.25

1.27

4

1.27

CMBA0.25

LAND PATTERN RECOMMENDATION

SEE DETAIL A

0.10

0.25

1.75 MAX

0.51

0.33

0.50

R0.10

0.25

R0.10

8° 0°

0.90

0.406

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.

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

http://www.fairchildsemi.com/packaging/

(1.04)

DETAIL A

SCALE: 2:1

Figure 17. 8-Lead, Small Outline Package (SOP)

.

C

0.10 C

x 45°

GAGE PLANE

0.36

SEATING PLANE

0.19

OPTION A - BEVEL EDGE

OPTION B - NO BEVEL EDGE

NOTES: UNLESS OTHERWISE SPECIFIED A) THIS PACKAGE CONFORMS TO JEDEC

MS-012, VARIATION AA, ISSUE C, B) ALL DIMENSIONS ARE IN MILLIMETERS. C) DIMENSIONS DO N OT INCLUDE MOLD FLASH OR BURRS. D) LANDPATTERN STANDARD: SOIC127P600X175-8M. E) DRAWING FILENAME: M08AREV13

Physical Dimensions

5.12

4.72

4.00

FAN7601B — Green Current Mode PWM Controller

0.65

6 10

1.75

6.30

5.70

PIN ONE INDICATOR

#1

TOP VIEW

5

(1.00)

4.15

3.75

1.80 MAX

0.25

0.10

0.506

0.306

(0.26)

SIDE VIEW END VIEW

NOTES:

A) NO DRAWING STANDARD APPLIES TO THIS PACKAGE B) ALL DIMENSIONS ARE IN MILLIMETERS. C) DIMENSIONS ARE EXCLUSIVE OF BURRS, MOLD FLASH, AND TIE BAR EXTRUSIONS. D) LAND PATTERN RECOMMENDATION IS FSC SOURCED. E) DRAWING FILE NAME AND REVISION : MKT-MSB10A,REV1

R0.15

0.70

0.30

#1

(1.00)

LAND PATTERN RECOMMENDATION

SEE DETAIL A

R0.15

8¡Æ

(2.04)

5.60

R0.20

0.30

0.15

GAGE PLANE

(0.36)

SEATING PLANE

DETAIL A

SCALE: 2:1

Figure 18. 10-Lead, Small Outline Package (SSOP)

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.

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

http://www.fairchildsemi.com/packaging/

.

FAN7601B — Green Current Mode PWM Controller

Datasheet FAN7601B Datasheet (Fairchild)

Specifications and Main Features

Frequently Asked Questions

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