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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
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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 in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended
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is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
FAN7601B
Green Current Mode PWM Controller
Features
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.
Green Current Mode PWM Control
Low Operating Current: Maximum 4 mA
Burst Mode Operation
Internal High-Voltage Startup Switch
Under-Voltage Lockout (UVLO): 12 V / 8 V
Latch Protection and Soft-Start Function
Over-Voltage Protection: 19 V
Operating Frequency up to 300 kHz
Maximum Duty Cycle: 95%
Applications
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.
Offline Adapter Applications
Auxiliary Power Supplies
Related Resources
AN4129 — Green Current Mode PWM
Controller FAN7601
Ordering Information
Part Number
Operating Junction Temperature
Top Mark
Package
Packing Method
FAN7601BMX
-40C to +150C
7601B
8-SOP
Tape & Reel
© 2008 Fairchild Semiconductor Corporation
FAN7601B • Rev. 1.0.4
www.fairchildsemi.com
FAN7601B — Green Current Mode PWM Controller
December 2013
VREF
8
VSTR
1
7 VCC
Enable
5V Ref
Rt/Ct 4
OVP
Startup
Circuit
19V
OSC
UVLO
VREF
12V/8V
12µA
S
Q
R
1.5V
Latch/SS 3
6 OUT
OVP
S
Q
R
1V
Reset
Circuit
Startup
Circuit
Delay
Circuit
2.5V
0.97V/0.9V
GND 5
2 CS/FB
Latch/SS
1V
Figure 1. Internal Block Diagram
Pin Configuration
VREF
VCC
Out
8
7
6
GND
5
7601B
1
VSTR
2
CS/FB
3
Latch/SS
4
Rt/Ct
Figure 2. Pin Assignments (Top View)
Pin Definitions
Pin # (8-Pin)
Name
1
VSTR
2
CS/FB
3
Latch/SS
4
Rt/Ct
Oscillator Timing
5
GND
Ground
6
Out
Gate Drive Output
7
VCC
IC Power Supply
8
VREF
Voltage Reference
© 2008 Fairchild Semiconductor Corporation
FAN7601B • Rev.1.0.4
Description
Startup
Current Sense and Feedback
Latch Protection and Soft-Start
www.fairchildsemi.com
2
FAN7601B — Green Current Mode PWM Controller
Block Diagram
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
VCC
Parameter
Min.
Max.
Unit
20
V
VCS/FB
Supply Voltage
Input Voltage CS/FB
-0.3
20.0
V
TSTG
Storage Temperature
-55
+150
C
TJ
Recommended Operating Junction Temperature
-40
+150
C
IO
Output Current
250
mA
VSTR
VSTR Input Voltage
500
V
ESD
Electrostatic Discharge
Capability
Human Body Model, JESD22-A114
2000
Charged Device Model, JESD22-C101
1500
V
Thermal Impedance
Symbol
JA
Parameter
Thermal Resistance, Junction-to-Ambient
© 2008 Fairchild Semiconductor Corporation
FAN7601B • Rev.1.0.4
Value
Unit
180
°C/W
www.fairchildsemi.com
3
FAN7601B — Green Current Mode PWM Controller
Absolute Maximum Ratings
TA=-25C~125C, VCC=14 V, RT=9.5 k, CT=2.2 nF unless otherwise specified.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Unit
4.85
5.00
5.15
V
Reference Section
VREF
Reference Output Voltage
IO=1 mA
VREF1
Line Regulation
VCC=10 V~18 V
10
20
mV
VREF2
Load Regulation
IO=1 mA ~ 10 mA
20
30
mV
100
110
kHz
1.5
%
Oscillator Section
fOSC
Initial Accuracy
90
STV
Voltage Stability
VCC=10 V~18 V
1.0
VOSC
Amplitude
Vpin4 peak-to-peak
1.25
V
PWM Section
VCS/FB1
CS/FB Threshold Voltage1
DMAX
Maximum Duty Cycle
DMIN
Minimum Duty Cycle
TA=25°C
0.9
1.0
1.1
V
92
95
98
%
0
%
Burst Mode Section
VCS/FB2
CS/FB Threshold Voltage2(1)
VCS/FB3
(1)
CS/FB Threshold Voltage3
0.77
0.97
1.17
V
0.7
0.9
1.1
V
9
12
15
A
1.2
1.5
1.8
V
2.25
2.50
2.75
V
18
19
20
V
Soft-Start Section
ISS
VSL
Soft-Start Current
Vpin3=GND
(2)
Soft-Start Limit Voltage
ISS=1 A
Protection Section
VLATCH
VOVP
Latch Voltage
Over-Voltage Protection
UVLO Section
VtH
Start Threshold Voltage
11
12
13
V
VtL
Minimum Operating Voltage
7
8
9
V
3
4
mA
2.0
2.5
V
12.0
14.0
V
TA=25C, CI=1 nF
45
150
ns
TA=25C, CI=1 nF
35
150
ns
1.0
1.5
mA
Total Current Section
IOP
Operating Supply Current
Output Section
VOL
Low Output Voltage
TA=25C, IO=100 mA
VOH
High Output Voltage
TA=25C, IO=-100 mA
(1)
tr
Rising Time
tf
Falling Time(1)
11.5
Startup Section
Istr
VSTR Startup Current
VSTR=30V, TA=25°C
0.5
Notes:
1. These parameters, although guaranteed, are not 100% tested in production.
2. It is recommended to connect a 1 Mresistor between the Latch/SS pin and GND to prevent abnormal operation
of the latch protection by noise coupling.
© 2008 Fairchild Semiconductor Corporation
FAN7601B • Rev.1.0.4
www.fairchildsemi.com
4
FAN7601B — Green Current Mode PWM Controller
Electrical Characteristics
3
5.03
2.5
Supply Cur r ent Icc
(mA)
Vref
(V)
5.05
5.01
2
1.5
4.99
4.97
1
0.5
0
4.95
-45 -25 -15
0
25
50
-45 -25 -15
80 100 125 140
Figure 3. Trimmed Reference Voltage
Vcc Stop Thr eshold VtL
(V)
Vcc Star t Thr eshold VtH
(V)
50
80
100 125 140
9
12.5
12
11.5
11
10.5
10
-45 -25 -15
0
25
50
8.5
8
7.5
7
-45 -25 -15
80 100 125 140
0
25
50
80 100 125 140
Junction Temperature(℃)
Junction Temperature(℃)
Figure 5. VCC Start Threshold Voltage
Figure 6. VCC Stop Threshold Voltage
110
100
Maximum Duty Cycle Dmax
(%)
Oscillator Frequency Fosc
(KHz)
25
Figure 4. Supply Current
13
105
100
95
90
85
-45 -25 -15
0
25
50
80
98
96
94
92
90
-45 -25 -15
100 125 140
0
25
50
80 100 125 140
Junction Temperature(℃)
Junction Temperature(℃)
Figure 7. Oscillator Frequency
Figure 8. Maximum Duty Cycle
1.35
O scillator L ow Thr eshold Vr L
(V)
2.7
O scillator High Thr eshold Vr H
(V)
0
Junction Temperature(℃)
Junction Temperature(℃)
2.6
2.5
2.4
2.3
-45 -25 -15
0
25
50
80
1.25
1.2
1.15
-45 -25 -15
100 125 140
0
25
50
80
100 125 140
Junction Temperature(℃)
Junction Temperature(℃)
Figure 9. Oscillator High Threshold Voltage
© 2008 Fairchild Semiconductor Corporation
FAN7601B • Rev.1.0.4
1.3
Figure 10. Oscillator Low Threshold Voltage
www.fairchildsemi.com
5
FAN7601B — Green Current Mode PWM Controller
Typical Performance Characteristics
20
Over Voltage Protection Vovp
(V)
Star t up Cur r ent Istr
(mA)
2
1.6
1.2
0.8
0.4
0
-45 -25 -15 0
25 50 80 100 125 140
Junction Temperature(℃)
19.2
18.8
18.4
18
-45 -25 -15 0
25 50 80 100 125 140
Junction Temperature(℃)
Figure 11. Startup Current
Figure 12. Over-Voltage Protection Level
2.8
14
2.7
Soft Start Current Isoft
(uA)
Latch Protection Vlatch
(V)
19.6
2.6
2.5
2.4
2.3
13
12
11
10
9
2.2
-45 -25 -15 0
25 50 80 100 125 140
Junction Temperature(℃)
-45 -25 -15 0
25 50 80 100 125 140
Junction Temperature(℃)
Figure 13. Latch Protection Voltage
Figure 14. Soft-Start Current
1000
Ct=
Frequency[KHz]
10nF
8.2nF
100
4.7nF
3.3nF
2.2nF
1nF
820pF
10
680pF
1
5K
15K
25K
Rt[Kohm]
35K
45K
Figure 15. Oscillator Frequency Characteristic
© 2008 Fairchild Semiconductor Corporation
FAN7601B • Rev.1.0.4
www.fairchildsemi.com
6
FAN7601B — Green Current Mode PWM Controller
Typical Performance Characteristics (Continued)
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
in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized
application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and
expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such
claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This
literature is subject to all applicable copyright laws and is not for resale in any manner.
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