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FAN4800IN Folha de dados(PDF) 5 Page - Fairchild Semiconductor |
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FAN4800IN Folha de dados(HTML) 5 Page - Fairchild Semiconductor |
5 / 20 page © 2005 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN4800 Rev. 1.0.5 5 Electrical Characteristics Unless otherwise stated, these specifications apply: VCC = 15V, RT = 52.3KΩ, CT = 470pF, TA = -40°C to 125°C. Symbol Parameter Condition Min. Typ. Max. Unit VOLTAGE ERROR AMPLIFIER VFB Input Voltage Range(1) 0 6 V gm1 Transconductance 50 70 90 µmho Vref(PFC) Feedback Reference Voltage TA = 25°C 2.45 2.50 2.55 V Ib(VEAO) Input Bias Current(2) -1.00 -0.05 mA VEAO(H) Output High-Voltage 5.8 6.0 V VEAO(L) Output Low-Voltage 0.1 0.4 V Isink(V) Sink Current TA = 25°C, VFB = 3V VEAO = 6.0V -35 -20 µA Isource(V) Source Current TA = 25°C, VFB = 1.5V VEAO = 1.5V 30 40 µA GV Open Loop Gain(1)(3) 50 60 dB PSRR1 Power Supply Rejection Ratio(1) 11V < VCC < 16.5V 50 60 dB CURRENT ERROR AMPLIFIER VIEAO Input Voltage Range(1) -1.5 0.7 V gm2 Transconductance 50 85 100 µmho Voffset Input Offset Voltage TA = 25°C 25 mV Ibeao Input Bias Current(1) -1 µA IEAO(H) Output High-Voltage 4.00 4.25 V IEAO(L) Output Low-Voltage 1.0 1.2 V Isink(I) Sink Current ISENSE = +0.5, IEAO = 4.0V -65 -35 µA Isource(I) Source Current ISENSE = -0.5, IEAO = 1.5V 35 75 µA Gi Open Loop Gain(1) 60 70 dB PSRR2 Power Supply Rejection Ratio(1) 11V < VCC < 16.5V 60 75 dB PFC OVP COMPARATOR Vovp Threshold Voltage TA = 25°C 2.70 2.78 2.90 V HY(ovp) Hysteresis TA = 25°C 230 350 mV LOW-POWER DETECT COMPARATOR Vth(lp) Threshold Voltage TA = 25°C 0.15 0.30 0.40 V VCC OVP COMPARATOR VCC_OVP Threshold Voltage TA = 25°C 17.5 17.9 18.5 V HY(VCC_OVP) Hysteresis TA = 25°C 1.40 1.50 1.65 V TRI-FAULT DETECT td(F) Time to Fault Detect HIGH(1) VFB = VFault Detect LOW to VFB = Open. 470pF from VFB to GND 2 4 ms F(L) Fault Detect LOW 0.4 0.5 0.6 V |
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