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FOD2741BSDV Datasheet(PDF) 4 Page - Fairchild Semiconductor |
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FOD2741BSDV Datasheet(HTML) 4 Page - Fairchild Semiconductor |
4 / 15 page ©2004 Fairchild Semiconductor Corporation www.fairchildsemi.com FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1 4 Electrical Characteristics (T A = 25°C unless otherwise specified) Input Characteristics Output Characteristics Transfer Characteristics Notes: 4. The deviation parameters VREF(DEV) and IREF(DEV) are defined as the differences between the maximum and minimum values obtained over the rated temperature range. The average full-range temperature coefficient of the reference input voltage, ∆V REF, is defined as: where ∆T A is the rated operating free-air temperature range of the device. 5. The dynamic impedance is defined as |ZOUT| = ∆VCOMP / ∆ILED. When the device is operating with two external resistors (see Figure 2), the total dynamic impedance of the circuit is given by: Symbol Parameter Test Conditions Device Min. Typ. Max. Unit VF LED Forward Voltage ILED = 10mA, VCOMP = VFB (Fig.1) All 1.5 V VREF Reference Voltage ILED = 10mA, VCOMP = VFB FOD2741A 2.482 2.495 2.508 V FOD2741B 2.470 2.495 2.520 V FOD2741C 2.450 2.500 2.550 V VREF (DEV) (4) Deviation of VREF Over Temperature TA = -25°C to +85°C All 4.5 17 mV ∆V REF/ ∆V COMP Ratio of VREF Variation to the Output of the Error Amplifier ILED = 10mA ∆VCOMP = 10V to VREF All -1.0 -2.7 mV/V ∆V COMP = 36V to 10V -0.5 -2.0 IREF Feedback Input Current ILED = 10mA, R1 = 10kΩ (Fig. 3) All 1.5 4 µA IREF (DEV) (4) Deviation of IREF Over Temperature TA = -25°C to +85°C All 0.4 1.2 µA ILED (MIN) Minimum Drive Current VCOMP = VFB (Fig. 1) All 0.45 1.0 mA I(OFF) Off-state Error Amplifier Current VLED = 37V, VFB = 0 (Fig. 4) All 0.05 1.0 µA |ZOUT| Error Amplifier Output impedance(5) VCOMP = VREF, ILED = 1mA to 20mA, f ≥ 1.0 kHz All 0.15 0.5 Ω Symbol Parameter Test Conditions Min. Typ. Max. Unit ICEO Collector Dark Current VCE = 10V (Fig. 5) 50 nA BVECO Emitter-Collector Voltage Breakdown IE = 100µA 7 V BVCEO Collector-Emitter Voltage Breakdown IC = 1.0mA 70 V Symbol Parameter Test Conditions Min. Typ. Max. Unit CTR Current Transfer Ratio ILED = 10mA, VCOMP = VFB, VCE = 5V (Fig. 6) 100 200 % VCE (SAT) Collector-Emitter Saturation Voltage ILED = 10mA, VCOMP = VFB, IC = 2.5mA (Fig. 6) 0.4 V ∆V REF ppm/°C () V REF DEV ()/VREF TA 25°C = () {} 10 6 × ∆T A ----------------------------------------------------------------------------------------------------- = Z OUT, TOT = ∆V ∆I --------Z OUT 1 R1 R2 -------- + × ≈ |
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