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FAN7601
Green Current Mode PWM Controller
Features
Description
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The FAN7601 is a green programmable frequency current
mode PWM controller. It is specially designed for the
off-line adapter application and the auxiliary power supplies
which require high efficiency at a light load and no load.
The internal high voltage start-up switch and the burst mode
reduce the power loss. The FAN7601 includes some
protections such as latch protection and over voltage
protection. The latch protection can be used for over voltage
protection and/or thermal protection and so on. And the soft
start prevents the output voltage over shoot at start up.
Green Current Mode PWM Control
Low Operating Current: Max 4mA
Burst Mode Operation
Internal High Voltage Start-up Switch
Under Voltage Lockout (UVLO): 12V/8V
Latch Protection & Soft Start Function
Over Voltage Protection: 19V
Operating Frequency up to 300kHz
Max Duty Cycle: 95%
Typical Applications
10-SSOP
• Off-Line Adapter Applications
• Auxiliary Power Supplies
8-DIP
8-SOP
1
1
1
Internal Block Diagram
Vref (10)
8
Vstr (1)
1
5V Ref
Rt/Ct
4
(5)
Enable
OSC
UVLO
Vref
+
−
OVP
Start-up
Circuit
+
−
7 Vcc
(8)
19V
12V/8V
12uA
Latch/SS
3
(4)
1.5V
S Q
R
6
OUT
(7)
2
CS/FB
(3)
OVP
+
−
S Q
R
2.5V
1V
+
−
Start-up
Circuit
GND
5
(6)
Reset
Circuit
+
−
Delay Circuit
0.97V/0.9V
+
−
−
Latch/SS
1V
* ( ) is 10-SSOP PIN Number
Rev. 1.0.2
©2005 Fairchild Semiconductor Corporation
FAN7601
Pin Assignments
8-DIP, 8-SOP
10-SSOP
Vref
Vcc
Out
GND
Vref
NC
Vcc
Out
GND
8
7
6
5
10
9
8
7
6
FAN7601
7601
YWW
1
Vstr
2
3
CS/FB Latch/SS
YWW
4
Rt/Ct
1
Vstr
2
NC
3
4
Pin Definitions
Pin Number
Pin Name
1 (1)
Vstr
2 (3)
CS/FB
Current Sense and Feedback
3 (4)
Latch/SS
Latch Protection and Soft Start
4 (5)
Rt/Ct
5 (6)
GND
6 (7)
Out
Gate Drive Output
7 (8)
VCC
IC Power Supply
8 (10)
Vref
Voltage Reference
*( ) is 10-SSOP PIN Number
2
Pin Function Description
Start-up
Oscillator Timing
Ground
5
CS/FB Latch/SS Rt/Ct
FAN7601
Absolute Maximum Ratings
(Ta = 25°C, unless otherwise specified)
Characteristics
Symbol
Value
Unit
Supply Voltage
VCC
20
V
VCS/FB
-0.3 to 20
V
Operating Temperature
TOPR
-25 to +125
°C
Storage Temperature
TSTG
-55 to +150
°C
Junction Temperature
Tj
150
°C
Output Current
IO
250
mA
Input Voltage CS/FB
Vstr Input Voltage
Vstr
500
V
ESD Capability, HBM Model
(All pins except Vcc and Vstr)
-
2.0
kV
ESD Capability, Machine Model
-
300
V
8-DIP
Thermal Resistance, Junction to Air
8-SOP
10-SSOP
100
Rθja
180
°C/W
130
3
FAN7601
Electrical Characteristics
(Ta = -25°C ~ 125°C, Vcc = 14V, Rt = 9.5kΩ, Ct = 2.2nF unless otherwise specified)
Characteristics
Symbol
Conditions
Min.
Typ.
Max.
Unit
4.85
5.00
5.15
V
REFERENCE SECTION
Reference Output Voltage
Vref
IO = 1mA
Line Regulation
∆Vref1
VCC = 10V ~ 18V
-
10
20
mV
Load Regulation
∆Vref2
IO = 1mA ~ 10mA
-
20
30
mV
90
100
110
kHz
OSCILLATOR SECTION
-
Initial Accuracy
FOSC
Voltage Stability
STV
VCC = 10V ~ 18V
-
1.0
1.5
%
VOCS
Vpin4 peak-to-peak
-
1.25
-
V
0.9
1.0
1.1
V
92
95
98
%
Amplitude
PWM SECTION
CS/FB Threshold Voltage1
-
VCS/FB1
Ta = 25°C
Maximum Duty Cycle
DMAX
Minimum Duty Cycle
DMIN
-
-
-
0
%
CS/FB Threshold Voltage2(1)
VCS/FB2
-
0.77
0.97
1.17
V
CS/FB Threshold Voltage3(1)
VCS/FB3
-
0.7
0.9
1.1
V
9
12
15
µA
1.2
1.5
1.8
V
BURST MODE SECTION
SOFT START SECTION
Soft Start Current
Soft Start Limit Voltage
(2)
ISS
Vpin3 = GND
VSL
ISS = 1µA
PROTECTION SECTION
VLATCH
-
2.25
2.5
2.75
V
VOVP
-
18
19
20
V
Start Threshold Voltage
VtH
-
11
12
13
V
Minimum Operating Voltage
VtL
-
7
8
9
V
IOP
-
-
3
4
mA
2
2.5
V
Latch Voltage
Over Voltage Protection
UVLO SECTION
TOTAL CURRENT SECTION
Operating Supply Current
OUTPUT SECTION
Low Output Voltage
VOL
Ta =25°C, IO = 100mA
-
High Output Voltage
VOH
Ta =25°C, IO = -100mA
11.5
12
14
V
Rising Time (1)
Tr
Ta =25°C, CI = 1nF
-
45
150
ns
Falling Time (1)
Tf
Ta =25°C, CI = 1nF
-
35
150
ns
Istr
Vstr = 30V, Ta =25°C
0.5
1
1.5
mA
START UP SECTION
VSTR Start-up Current
Note:
1. These parameters, although guaranteed, are not 100% tested in production.
2. It is recommended to connect 1MΩ resistor between the Latch/SS pin and GND to prevent abnormal operation of the latch
protection by noise coupling.
4
FAN7601
Typical Performance Characteristics
5.15
3.0
Supply Current Icc (mA)
Vref (V)
5.10
5.05
5.00
4.95
4.90
2.8
2.6
2.4
2.2
2.0
4.85
-50
0
50
100
-50
150
Vcc Stop Threshold VtL (V)
Vcc Start Threshold VtH (V)
12.5
150
12.0
11.5
8.5
8.0
7.5
7.0
-50
0
50
100
150
-50
Junction Temperature (°C)
0
50
100
150
Junction Temperature (°C)
Figure 4. Vcc Stop Threshold Voltage
Figure 3. Vcc Start Threshold Voltage
100
Maximum Duty Cycle Dmax (%)
110
Oscillator Frequency Fosc (kHz)
100
9.0
13.0
105
100
95
90
50
Figure 2. Supply Current
Figure 1. Trimmed Reference Voltage
11.0
0
Junction Temperature (°C)
Junction Temperature (°C)
-50
0
50
100
Junction Temperature (°C)
Figure 5. Oscillator Frequency
150
98
96
94
92
90
-50
0
50
100
150
Junction Temperature (°C)
Figure 6. Maximum Duty Cycle
5
FAN7601
2.7
Oscillator Low Threshold VrL (V)
Oscillator High Threshold VrH (V)
Typical Performance Characteristics (Continued)
2.6
2.5
2.4
2.3
-50
0
50
100
1.35
1.30
1.25
1.20
1.15
-50
150
150
150
120
120
90
60
30
50
100
60
30
150
-50
2.0
100
150
20.0
Over Voltage Protection Vovp (V)
Start up Current Istr (mA)
50
Figure 10. Output Falling Time
Figure 9. Output Rising Time
1.6
1.2
0.8
0.4
-50
0
50
100
Junction Temperature (°C)
Figure 11. Start-up Current
6
0
Junction Temperature (°C)
Junction Temperature (°C)
0.0
150
90
0
0
100
Figure 8. Oscillator Low Threshold Voltage
Falling Time Tf (ns)
Rising Time Tr (ns)
Figure 7. Oscillator High Threshold Voltage
-50
50
Junction Temperature (°C)
Junction Temperature (°C)
0
0
150
19.6
19.2
18.8
18.4
18.0
-50
0
50
100
150
Junction Temperature (°C)
Figure 12. Over Voltage Protection Level
FAN7601
15
2.7
14
Soft Start Current Isoft (uA)
2.8
2.6
2.5
2.4
2.3
2.2
-50
0
50
100
13
12
11
10
9
150
-50
0
50
100
150
Junction Temperature (°C)
Junction Temperature (°C)
Figure 14. Soft Start Current
Figure 13. Latch Protection Voltage
1000
Frequency (kHz)
Latch Protection Vlatch (V)
Typical Performance Characteristics (Continued)
Ct=
680pF
820pF
1nF
2.2nF
3.3nF
4.7nF
8.2nF
10nF
100
10
1
0
10
20
30
40
50
Rt (kΩ)
Figure 15. Oscillator Frequency Characteristic
7
FAN7601
Mechanical Dimensions
8DIP
8
FAN7601
Mechanical Dimensions (Unit: mm) (Continued)
Package
8-SOP
MIN
#5
6.00 ±0.30
0.236 ±0.012
8°
0~
+0.10
0.15 -0.05
+0.004
0.006 -0.002
MAX0.10
MAX0.004
1.80
MAX
0.071
3.95 ±0.20
0.156 ±0.008
5.72
0.225
0.41 ±0.10
0.016 ±0.004
#4
1.27
0.050
#8
5.13
MAX
0.202
#1
4.92 ±0.20
0.194 ±0.008
(
0.56
)
0.022
1.55 ±0.20
0.061 ±0.008
0.1~0.25
0.004~0.001
0.50 ±0.20
0.020 ±0.008
9
FAN7601
Mechanical Dimensions (Unit: mm) (Continued)
Package
10-SSOP-225
10
FAN7601
Ordering Information
Device
Package
FAN7601N
8-DIP
FAN7601M
8-SOP
FAN7601G
10-SSOP
Operating Temp.
-25°C ~ 125°C
11
FAN7601
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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