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TA76432S Fiches technique(PDF) 4 Page - Toshiba Semiconductor |
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TA76432S Fiches technique(HTML) 4 Page - Toshiba Semiconductor |
4 / 12 page TA76432FT/FC/F/FR/S 2002-07-12 4 Recommended Operating Conditions Characteristics Symbol Min Typ. Max Unit Cathode voltage VKA VREF ¾ 19 V Cathode current IK 0.5 ¾ 15 mA Operating temperature Topr -40 ¾ 85 °C Electrical Characteristics (Unless otherwise specified, Ta ==== 25°C, IK ==== 5 mA) Characteristics Symbol Test Condition Min Typ. Max Unit Reference voltage VREF VKA = VREF 1.242 1.26 1.278 V Deviation of reference input voltage over temperature VREF (dev) 0°C < = Ta <= 85°C, VKA = VREF ¾ 3 15 mV VREF < = VKA <= 5 V ¾ 0.5 2.5 Ratio of change in reference input voltage to the change in cathode voltage DVREF/DV 5 V < = VKA <= 19 V ¾ 0.3 2.0 mV/V Reference Input current IREF VKA = VREF ¾ 2 4 mA Deviation of reference input current over temperature IREF (dev) 0°C < = Ta <= 85°C, VKA = VREF, R1 = 10 kW, R2 = ¥ ¾ 0.3 1.2 mA Minimum cathode current for regulation IKmin VKA = VREF ¾ 0.2 0.5 mA Off-State cathode current IKoff VKA = 19 V, VREF = 0 V ¾ ¾ 1.0 mA Dynamic impedance ïZKAï VKA = VREF, f < = 1 kHz, 0.5 mA < = IK <= 15 mA ¾ 0.2 0.5 W The deviation parameters VREF (dev) and IREF (dev) are defined as the maximum variation of the VREF and IREF over the rated temperature range. The average temperature coefficient of the VREF is defined as: Application Circuit Example Error amplification circuit for switching power supply This circuit amplifies the difference between the switching power supply’s secondary output voltage and the shunt regulator’s reference voltage. It then feeds the amplified voltage back to the primary input voltage via the photocoupler. C ppm Ta C @25 V 10 V V REF 6 (dev) REF REF ° D ÷÷ ÷ ø ö çç ç è æ ° ´ = a min max VREF (dev) DTa VREF Photo- coupler VOUT GND Shunt regulator |
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