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FOD2741BSDV Datasheet(PDF) 3 Page - Fairchild Semiconductor |
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FOD2741BSDV Datasheet(HTML) 3 Page - Fairchild Semiconductor |
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3 / 15 page  12/9/04 Page 3 of 15 © 2003 Fairchild Semiconductor Corporation OPTICALLY ISOLATED ERROR AMPLIFIER FOD2741A FOD2741B FOD2741C 1. 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, ∆VREF, is defined as: where ∆TA is the rated operating free-air temperature range of the device. 2. 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: ELECTRICAL CHARACTERISTICS (TA = 25°C Unless otherwise specified.) INPUT CHARACTERISTICS Parameter Test Conditions Symbol Device Min. Typ. Max. Unit LED Forward Voltage (ILED = 10 mA, VCOMP = VFB) (fig.1) VF ALL 1.5 V Reference Voltage ILED = 10 mA, VCOMP = VFB VREF A 2.482 2.495 2.508 V B 2.470 2.495 2.520 V C 2.450 2.500 2.550 V Deviation of VREF over temperature TA = -25°C to +85°CVREF (DEV) ALL 4.5 17 mV Ratio of VREF variation to the output of the error amplifier ILED = 10 mA ∆VCOMP = 10V to VREF ∆VREF/ ∆VCOMP ALL -1.0 -2.7 mV/ V ∆VCOMP = 36V to 10V -0.5 -2.0 Feedback Input Current ILED = 10mA, R1 = 10kΩ (fig 3) IREF ALL 1.5 4 µA Deviation of IREF over temperature TA = -25°C to +85°CIREF (DEV) ALL 0.4 1.2 µA Minimum Drive Current VCOMP = VFB (fig.1) ILED (MIN) ALL 0.45 1.0 mA Off-state error amplifier current VLED = 37V, VFB = 0 (fig 4.) I(OFF) ALL 0.05 1.0 µA Error amplifier output impedance (see note 2) VCOMP = VREF, ILED = 1mA to 20mA, f ≥ 1.0 kHz |ZOUT| ALL 0.15 0.5 Ω ∆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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