FAN7554 Fairchild Semiconductor, FAN7554 Datasheet
FAN7554
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FAN7554_NL
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FAN7554 Summary of contents
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... The FAN7554 has various protection functions such as an over load 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 as well as the 8-SOP package. 8-DIP 1 ...
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... FAN7554 Internal Block Diagram 3.5V 3.5V Vref Vref 100 uA 100 S/S S 0.3V 0. Vcc Vcc Vcc 5uA 5uA 5uA + + Absolute Maximum Ratings ( unless otherwise specified ) Parameter Supply voltage Output current Input voltage to FB pin Input voltage to IS pin Power dissipation 8-DIP 8-SOP ...
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... Pin Function Description Inverting(-) input of pwm comparator, on/off control & OLP sensing terminal. Soft start Non-inverting(+) input of PWM comparator, OCL sensing terminal Oscillator time constant(Rt/Ct) Ground Output of gate driver Power supply Output of 5V reference Value Unit ±0.5 ±5 GND Rt/Ct FAN7554 % % 3 ...
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... FAN7554 Electrical Characteristics ( Vcc=16V, Rt=10k , Ct=3.3nF unless otherwise specified) Parameter < REFERENCE SECTION > Reference output voltage Line regulation Load regulation Short circuit output current < OSCILLATOR SECTION > Oscillation frequency Frequency change with Vcc Ramp high voltage Ramp low voltage Discharge current < PWM SECTION > ...
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... C, Vcc=16V, Rt =10k , Ct = 3.3nF unless otherwise specified) Parameter <TOTAL STAND-BY CURRENT SECTION> Start-up current Operating supply current Off State current Note: 1. These parameters, although guaranteed, are not 100% tested in production. (Continued) Symbol Conditions <V ,V <V OFF FB TH(FB) S/S Min. Typ 0.2 OFF FAN7554 Max. Unit 0 0 ...
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... FAN7554 Typical Perfomance Characteristics [ Rt vs. Freqency ] [ Rt vs. Freqency ] [ Rt vs. Freqency ] [ Rt vs. Freqency ] 10000.0 1000.0 100.0 10.0 1.0 0 Rt[Kohm] Figure 1. Rt vs. Frequency [ Ct vs Duty ] [ Ct vs Duty ] [ Ct vs Duty ] [ Ct vs Duty ] 95.0 85.0 75.0 65.0 55.0 45.0 35.0 25.0 15.0 0 [nF] Figure 3. Ct vs. Duty 6 0 ...
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... FAN7554 Typical Performance Characteristics Figure 5. Temperature vs. Start-up Current Figure 7. Temperature vs. Reference Voltage Figure 9. Temperature vs. Start Threshold Voltage 7 (Continued) Figure 6. Temperature vs. Operating Supply Current Figure 8. Temperature vs. Oscillation frequency Figure 10. Temperature vs. Min. Operating Voltage ...
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... R 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 over load protection, an over current protection, and an over voltage protection. The over load protection forces the FAN7554 to stop its operation if the load current is higher than the preset value ...
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... Gate Drive Gate Drive Internal clock Internal clock Vhigh(2.8V) Vhigh(2.8V) Sawtooth waveform Sawtooth waveform Vlow(1.2V) Vlow(1.2V) FAN7554 FAN7554 Internal clock Internal clock FAN7554 FAN7554 - 2.8) / (0.0063 R - 3.8 (±10 1 Figure 15. Sawtooth & Clock Waveform FAN7554 Output drive Output drive . Capacitor > > < < ...
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... D1 turns off. When the feedback voltage is less than 3V, the charge slope becomes an expo- nential function and, when it is greater than 3V, the charge slope becomes linear. When the feedback voltage reaches almost 6V, the FAN7554 shuts down. The shut down circuit is configured for auto-restart automatically restarts when Vcc reaches the under voltage 9V. ...
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... Cs. When the soft start voltage becomes less than 1.5V, 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 200uA. So the stand-by power is reduced and SMPS efficiency is improved ...
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... OFF State Figure 20. ON-OFF Control Circuit Waveforms UVLO UVLO OFF OFF PWR PWR Vref Vref SAVE SAVE Good logic Good logic Internal bias Internal bias Normal State Normal State VCC VCC 7 7 15V/9V 15V/9V FAN7554 FAN7554 Icc Icc 4.5mA 4.5mA 0.2mA 0.2mA ...
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... 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 ...
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... FAN7554 FAN7554 Flyback Converter Demo Circuit (Fsw:100kHz NTC NTC C102 C102 R101 R101 C103 C103 C301 C302 C301 C302 LF101 LF101 C101 C101 TNR TNR FUSE FUSE 8 8 Vref Vcc OUT GND Vref Vcc OUT GND FAN7554 FAN7554 R107 R107 Input:85 ~ 265V ...
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... Part List For FAN7554 Flyback Converter Demo Board Part Value FUSE FUSE 250 2A NTC NTC 5D-11 RESISTOR R101 330k R102 - R103, R104 100k R105 22 R106 4.7k R107 12k R108 10 R109 1k R110 0.5 R201 1k R202 1k R203 4.7k R204 1.2k R205 - MOSFET Q101 ...
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... FAN7554 Transformer Specification Schematic Diagram (Top view Winding Specification No. Pin 12V Electrical Characteristic Closure Inductance Leakagel 16 3mm 3mm 3mm 12V 12V bottom bottom bottom Wire 0.35 1 0.35 4 0.35 1 0.35 1 Pin Spec 400uH ±10 10uH MAX . 12V 12V 12V Turns Winding Method ...
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... FAN7554 forward converter demo circuit ( fsw:100kHz R105 R105 C102 C102 C301 C302 C301 C302 L101 L101 C103 C103 R106 R106 C101 C101 R101 R101 R102 R102 FUSE FUSE D101 D101 C106 C106 RT101 RT101 Input 265V Input 265V AC AC IC301 IC301 ...
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... FAN7554 Part List For FAN7554 Forward Converter Demo Board Part Value FUSE FUSE 250 2A NTC RT101 DSC 10D-11 RESISTOR R101 330k R102 - R103, R104 56k R105, R106 220k R107 10 R108 20 R109 4.7k R110 1.2k R111 0.5 //0.5 //0.5 R112 1k R113 12k ...
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... Winding Specification No. Pin VCC Core : Powder 27 pi 16grade 12T ( 1 12V : 27T ( 0.65 Nvcc ; 6turn Nvcc ; 6turn Nvcc ; 6turn Np ; 32turn Np ; 32turn Np ; 32turn Ns,12 ; 5turn Ns,12 ; 5turn Ns,12 ; 5turn Ns,5 ; 4turn Ns,5 ; 4turn Ns,5 ; 4turn Np ; 32turn Np ; 32turn Np ; 32turn Wire FAN7554 Turns ...
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... FAN7554 Mechanical Dimensions Package Symbol Min 0.10 A2 1.25 B 0.35 C 0.19 D 4. 5.79 h 0. aaa - bbb - 20 8-SOP Nom Max - 1.75 0.15 0.25 1.45 1.50 0.37 0.51 0.20 0.25 4.90 5.00 3.90 4.00 1.27BSC 5.99 6.20 - 0.50 0.70 0.90 0.36 BSC ...
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... Mechanical Dimensions Package (Continued) 8-DIP Dimensions in millimeters FAN7554 21 ...
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... FAN7554 Ordering Information Product Number FAN7554 FAN7554D 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 ...