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FAN7601
Green Current Mode PWM Controller
Features
•••••••••
Green Current Mode PWM ControlLow Operating Current: Max 4mABurst Mode Operation
Internal High Voltage Start-up SwitchUnder Voltage Lockout (UVLO): 12V/8VLatch Protection & Soft Start FunctionOver Voltage Protection: 19V
Operating Frequency up to 300kHzMax Duty Cycle: 95%
Description
The FAN7601 is a green programmable frequency currentmode PWM controller. It is specially designed for the
off-line adapter application and the auxiliary power supplieswhich require high efficiency at a light load and no load. The internal high voltage start-up switch and the burst modereduce the power loss. The FAN7601 includes some protections such as latch protection and over voltage
protection. The latch protection can be used for over voltageprotection and/or thermal protection and so on. And the softstart prevents the output voltage over shoot at start up.
10-SSOP8-SOP8-DIPTypical Applications
•Off-Line Adapter Applications•Auxiliary Power Supplies
111
Internal Block DiagramVref (10)8Vstr (1)17Vcc(8)5V RefRt/Ct4(5)OSCVref12uALatch/SS3(4)EnableStart-upCircuitUVLOOVP+−19V+−12V/8V1.5VOVPSQR6OUT(7)+−2.5VSQRDelay Circuit+−0.97V/0.9V2CS/FB(3)1VGND5(6)+−Start-upCircuitResetCircuit+−−Latch/SS1V* ( ) is 10-SSOP PIN NumberRev. 1.0.2©2005 Fairchild Semiconductor Corporation
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FAN7601
Pin Assignments
8-DIP, 8-SOP
VrefVccOutGNDVrefNC10-SSOP
VccOutGND8765109876FAN7601YWW1Vstr7601YWW1Vstr234Rt/Ct2NC345CS/FBLatch/SSCS/FBLatch/SSRt/CtPin Definitions
Pin Number
1 (1)2 (3)3 (4)4 (5)5 (6)6 (7)7 (8)8 (10)
*( ) is 10-SSOP PIN Number
Pin NameVstrCS/FBLatch/SSRt/CtGNDOutVCCVref
Start-up
Pin Function Description
Current Sense and FeedbackLatch Protection and Soft StartOscillator TimingGround
Gate Drive OutputIC Power SupplyVoltage Reference
2
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FAN7601
Absolute Maximum Ratings
(Ta = 25°C, unless otherwise specified)CharacteristicsSupply VoltageInput Voltage CS/FBOperating Temperature Storage TemperatureJunction TemperatureOutput CurrentVstr Input Voltage
ESD Capability, HBM Model (All pins except Vcc and Vstr)ESD Capability, Machine Model
8-DIP
Thermal Resistance, Junction to Air
8-SOP10-SSOP
RθjaSymbolVCCVCS/FBTOPRTSTGTjIOVstr--Value20-0.3 to 20-25 to +125-55 to +150
1502505002.0300100180130
°C/WUnitVV°C°C°CmAVkVV
3
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FAN7601
Electrical Characteristics
(Ta = -25°C ~ 125°C, Vcc = 14V, Rt = 9.5kΩ, Ct = 2.2nF unless otherwise specified)CharacteristicsREFERENCE SECTION Reference Output VoltageLine RegulationLoad Regulation
OSCILLATOR SECTION Initial AccuracyVoltage StabilityAmplitudePWM SECTION
CS/FB Threshold Voltage1Maximum Duty CycleMinimum Duty CycleBURST MODE SECTION CS/FB Threshold Voltage2(1)CS/FB Threshold Voltage3(1)SOFT START SECTION Soft Start CurrentSoft Start Limit Voltage(2)PROTECTION SECTION Latch Voltage
Over Voltage ProtectionUVLO SECTION Start Threshold VoltageMinimum Operating VoltageTOTAL CURRENT SECTION Operating Supply CurrentOUTPUT SECTION Low Output VoltageHigh Output VoltageRising Time (1)Falling Time (1)START UP SECTION VSTR Start-up Current
Istr
Vstr = 30V, Ta =25°C
0.5
1
1.5
mA
VOLVOHTrTf
Ta =25°C, IO = 100mATa =25°C, IO = -100mATa =25°C, CI = 1nFTa =25°C, CI = 1nF
-11.5--2124535
2.514150150
VVnsns
IOP
--3
4
mA
VtHVtL
--117
128
139
VV
VLATCHVOVP
--2.2518
2.519
2.7520
VV
ISSVSL
Vpin3 = GNDISS = 1µA
91.2
121.5
151.8
µAV
VCS/FB2VCS/FB3
--0.770.7
0.970.9
1.171.1
VV
VCS/FB1DMAXDMIN
Ta = 25°C
--0.992-1.095-1.1980
V%%
FOSCSTVVOCS
-VCC = 10V ~ 18VVpin4 peak-to-peak
90--1001.01.25
1101.5-kHz%V
Vref∆Vref1∆Vref2
IO = 1mAVCC = 10V ~ 18VIO = 1mA ~ 10mA
4.85--5.001020
5.152030
VmVmV
Symbol
Conditions
Min.
Typ.
Max.
Unit
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
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FAN7601
Typical Performance Characteristics
5.153.0 5.10Vref (V)5.05Supply Current Icc (mA)2.82.65.00 2.44.954.902.24.85-500501001502.0-50050100150Junction Temperature (°C)Junction Temperature (°C)Figure 1. Trimmed Reference Voltage
13.09.0Figure 2. Supply Current
Vcc Start Threshold VtH (V) Vcc Stop Threshold VtL (V)12.58.5 11.57.511.07.0-50050100150-50050100150 Junction Temperature (°C) Junction Temperature (°C)Figure 3. Vcc Start Threshold Voltage
110Figure 4. Vcc Stop Threshold Voltage
100Oscillator Frequency Fosc (kHz)Maximum Duty Cycle Dmax (%)9810596100 94959290-5005010015090-50050100150Junction Temperature (°C)Junction Temperature (°C)Figure 5. Oscillator FrequencyFigure 6. Maximum Duty Cycle
12.08.0 5
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FAN7601
Typical Performance Characteristics (Continued)
Oscillator High Threshold VrH (V)Oscillator Low Threshold VrL (V)2.71.35 2.61.302.51.25 2.41.202.3-500501001501.15-50050100150Junction Temperature (°C)Junction Temperature (°C)Figure 7. Oscillator High Threshold Voltage
150Figure 8. Oscillator Low Threshold Voltage
150120120Rising Time Tr (ns)Falling Time Tf (ns)9090 606030300-500501001500-50050100150Junction Temperature (°C)Junction Temperature (°C)Figure 9. Output Rising Time
Figure 10. Output Falling Time
20.02.0Start up Current Istr (mA)1.6Over Voltage Protection Vovp (V)19.61.2 19.20.818.80.418.40.0-5005010015018.0-50050100150Junction Temperature (°C)Junction Temperature (°C)Figure 11. Start-up Current
Figure 12. Over Voltage Protection Level
6
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FAN7601
Typical Performance Characteristics (Continued)
2.8 15Soft Start Current Isoft (uA)Latch Protection Vlatch (V)2.7142.6132.512 2.4112.3102.2-500501001509-50050100150Junction Temperature (°C)Junction Temperature (°C)Figure 13. Latch Protection VoltageFigure 14. Soft Start Current
1000Ct= 680pF 820pF 1nF 2.2nF 3.3nF 4.7nF 8.2nF 10nFFrequency (kHz)10010101020304050Rt (kΩ)Figure 15. Oscillator Frequency Characteristic
7
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FAN7601
Mechanical Dimensions
8DIP
8
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FAN7601
Mechanical Dimensions (Unit: mm) (Continued)
Package
8-SOP
MIN1.55 ±0.200.061 ±0.0080.1~0.250.004~0.001#1#84.92 ±0.200.194 ±0.0085.13MAX0.202(#4#56.00 ±0.300.236 ±0.012+0.100.15-0.05+0.0040.006-0.0020.56)0.0221.80MAX0.071MAX0.10MAX0.0043.95 ±0.200.156 ±0.0085.720.2250.50 ±0.200.020 ±0.0080~8°1.270.0500.41 ±0.100.016 ±0.0049
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FAN7601
Mechanical Dimensions (Unit: mm) (Continued)
Package
10-SSOP-225
10
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FAN7601
Ordering Information
DeviceFAN7601NFAN7601MFAN7601G
Package8-DIP8-SOP10-SSOP
-25°C ~ 125°COperating Temp.
11
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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.
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4/11/05 0.0m 001Stock#DSxxxxxxxx
2005 Fairchild Semiconductor Corporation
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.
