TA76L431FB TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic TA76L431FB 2.495 V Adjustable High-Precision Shunt Regulators These devices are adjustable high-precision shunt regulators whose output voltage (VKA) can be set arbitrarily using two external resistors. The devices have a precise internal reference voltage of 2.495 V, enabling them to operate at low voltage. In addition, they can be used as zener diodes to perform temperature compensation. Features SOP3-P-0302-0.95 • Precision reference voltage : VREF = 2.495 V ± 1.0% (Ta = 25°C) • Adjustable output voltage: VREF ≤ VOUT ≤ 19 V • Minimum cathode current for regulation: Ikmin = 0.5 mA (max) • Packages: Surface-mount S-Mini Weight: 0.012 g (typ.) Pin Assignment/Marking 3 1: Cathode (K) 2: Reference (REF) 3: Anode (A) 1F 1 2 How to Order Product No. Package TA76L431FB(TE85L,F) S-Mini Packing Type and Capacity Embossed tape: 3000 pcs/real 1 2007-01-31 TA76L431FB Functional Block Diagram Circuit Symbol Cathode (K) Cathode (K) Reference (REF) Reference (REF) 2.495 V Anode (A) Anode (A) Typical Application Circuits (1) 2.495 V Reference (VKA = VREF) (2) Shunt Regulator (VKA > VREF) VIN VIN VOUT R1 VOUT = 2.495 V R2 IREF VREF ⎛ R1 ⎞⎟ + IREF • R1 V OUT = V REF ⎜⎜1 + R2 ⎟⎠ ⎝ Precautions During Use 1. TA76L431FB These products contain MOS elements. Please take care to avoid generating static electricity when handling these devices. 2. TA76L431FB The oscillation frequency of these devices is determined by the value of the capacitor connected between the anode and the cathode. When establishing maximum operating condition parameters, please derate the absolute maximum rating values specified in these datasheets so as to allow an operational safety margin. Use of a laminated ceramic capacitor is recommended 2 2007-01-31 TA76L431FB Absolute Maximum Ratings (Ta = 25°C) Characteristics Symbol Rating Unit Cathode voltage VKA 20 V Cathode current IK 50 mA Cathode-anode reverse current −IK 50 mA Reference voltage VREF 7 V Reference current IREF 50 μA Reference-anode reverse current −IREF 10 mA Power dissipation PD 200 (Note 1) mW Thermal resistance Rth 625 (Note 1) °C/W Tjopr −40~150 °C Junction temperature Tj 150 °C Storage temperature Tstg −55~150 °C Operating junction temperature Note 1: Glass epoxy substrate mounting: 30 mm × 30 mm × 0.8 mmt (Cu pad area 35 mm2) Note 2: Using continuously under heavy loads (e.g. the application of high temperature/current/voltage and the significant change in temperature, etc.) may cause this product to decrease in the reliability significantly even if the operating conditions (i.e. operating temperature/current/voltage, etc.) are within the absolute maximum ratings and the operating ranges. Please design the appropriate reliability upon reviewing the Toshiba Semiconductor Reliability Handbook (“Handling Precautions”/Derating Concept and Methods) and individual reliability data (i.e. reliability test report and estimated failure rate, etc). Operating Ranges Characteristics Symbol Min Typ. Max Unit Cathode voltage VKA VREF ⎯ 19 V Cathode current IK 0.5 ⎯ 40 mA Electrical Characteristics (Unless otherwise specified, Ta = 25°C, IK = 10 mA) Characteristics Reference voltage Symbol VREF Deviation of reference input voltage over temperature VREF (dev) Ratio of change in reference input voltage to the change in cathode voltage ΔVREF/ΔV Reference input current Deviation of reference input current over temperature IREF IREF (dev) Test Condition Min Typ. Max Unit 2.470 2.495 2.520 V 0°C < = Ta < = 70°C, VKA = VREF ⎯ 8 18 mV VREF < = VKA < = 10 V ⎯ 0.8 2.4 10 V < = VKA < = 19 V ⎯ 0.8 2.0 VKA = VREF ⎯ 0.6 3 μA 0°C < = Ta < = 70°C, VKA = VREF, R1 = 10 kΩ, R2 = ∞ ⎯ 0.3 1.2 μA VKA = VREF mV/V Minimum cathode current for regulation IKmin VKA = VREF ⎯ 0.2 0.5 mA Off-State cathode current IKoff VKA = 19 V, VREF = 0 V ⎯ ⎯ 1.0 μA ⎪ZKA⎪ VKA = VREF, f < = 1 kHz, 0.5 mA < = IK < = 40 mA ⎯ 0.2 0.5 Ω Dynamic impedance 3 2007-01-31 TA76L431FB Precaution on Application Tj = 25°C in the measurement conditions of each item is a regulation for where a pulse test is carried out and any drift in the electrical characteristic due to a rise in the junction temperature of the chip may be disregarded. The deviation parameters VREF (dev) and IREF (dev) are defined as the maximum variation of the VREF and IREF over the rated temperature range (Ta = 0 to 70°C). The average temperature coefficient of the VREF is defined as: VREF max 6 ⎛V ⎜ REF (dev) × 10 ⎜⎜ V REF @25°C αVREF = ⎝ ΔTa VREF (dev) min ⎞ ⎟ ⎟⎟ ⎠ (ppm °C ) ΔTa Application Circuit Example Error amplification circuit for switching power supply Photocoupler VOUT GND Shunt regulator 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. 4 2007-01-31 TA76L431FB PDmax – Ta IK – VKA 50 TA76L431FB Input (mA) 0.5 IK 0.3 Single 0.2 0.1 VKA IK 30 VKA = VREF 0.4 Cathode current Allowable power dissipation PDmax (W) 0.6 10 Ta = 25°C −10 85°C −30 25°C Ta = −40°C 0 0 20 40 60 80 100 120 140 −50 160 −1 Ambient temperature Ta (°C) 0 Cathode voltage VKA = VREF VKA Reference voltage VREF (V) IK (μA) VKA 3 (V) 2.53 Input 400 VKA = VREF IK 2 VREF – Ta IK – VKA 600 Cathode current 1 Ta = 25°C IK min 200 85°C Ta = −40°C 0 85°C 25°C 25°C IK = 10 mA VKA Input VREF 2.51 IK 2.49 2.47 Ta = −40°C −200 −1 −0 1 Cathode voltage 2 VKA 2.45 −50 3 (V) 0 50 100 150 Ambient temperature Ta (°C) ΔVREF – VKA VKA = VREF IK = 10 mA −10 2.51 VKA Inpu VREF IK −20 2.49 Input VKA −30 IK R1 V 2.47 REF −40 R2 Change in reference voltage ΔVREF (mV) 2.53 0 −50 2.45 0−50 IK = 10 mA Ta = 25°C 5 0 10 50 15 Cathode voltage VKA 20 100 25 (V) 5 2007-01-31 TA76L431FB IREF – Ta ZKA – f 1.0 1.2 100 220 Ω eo 0.6 0.6 0.4 0.4 0.2 0.2 Input Input VKA IK IREF ZKA (Ω) 0.8 30 Dynamic impedance 1.0 0.8 10kΩ 10 kΩ Reference current IREF (μA) 50 5 IK eo = RS RS ＞ ZKA eo = 10 ei ・ZKA RS + ZKA ei ei ・ZKA RS e ∴ ZKA = o ・RS ei GND 3 Ta = 25°C VKA = VREF 0.5 mA < = −IK < = 50 mA 1 0.5 0.3 IK = 10 mA 0 50 100 0.1 1k 150 10 k 100 k Ambient temperature Ta (°C) Frequency f AV – f 40 VOUT Input monitor 0 GND IK = 10 mA Ta = 25°C 30 Input 5 Voltage swing (V) 10 kΩ VIN IK 220 Ω 10 kΩ 10 μF 20 10 220 Ω Output Pulse Generator f = 100 kHz GND 3 2 Output 1 0 0 1k 10 k 100 k 1M Frequency f 10 M 0 1 2 (Hz) 3 4 5 6 Time t (μs) Stability Boundaty Conditions IK 40 CL IK (mA) 50 Cathode current AV (dB) Open loop voltage gain (Hz) Pulse response 60 50 10 M 1M 50 Ω 00 −50 30 Unstable Stable Ta = 25°C VKA = VREF(2.495 V)~15 V 20 10 0 0.0001 0.001 0.01 0.1 1 10 100 Load capacitance CL (μF) 6 2007-01-31 TA76L431FB Package Dimensions SOP3-P-0302-0.95 Weight: 0.012 g (typ.) 7 2007-01-31 TA76L431FB RESTRICTIONS ON PRODUCT USE 20070701-EN • The information contained herein is subject to change without notice. • TOSHIBA is continually working to improve the quality and reliability of its products. Nevertheless, semiconductor devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to comply with the standards of safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of such TOSHIBA products could cause loss of human life, bodily injury or damage to property. In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as set forth in the most recent TOSHIBA products specifications. Also, please keep in mind the precautions and conditions set forth in the “Handling Guide for Semiconductor Devices,” or “TOSHIBA Semiconductor Reliability Handbook” etc. • The TOSHIBA products listed in this document are intended for usage in general electronics applications (computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances, etc.).These TOSHIBA products are neither intended nor warranted for usage in equipment that requires extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or bodily injury (“Unintended Usage”). Unintended Usage include atomic energy control instruments, airplane or spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments, medical instruments, all types of safety devices, etc.. Unintended Usage of TOSHIBA products listed in his document shall be made at the customer’s own risk. • The products described in this document shall not be used or embedded to any downstream products of which manufacture, use and/or sale are prohibited under any applicable laws and regulations. • The information contained herein is presented only as a guide for the applications of our products. No responsibility is assumed by TOSHIBA for any infringements of patents or other rights of the third parties which may result from its use. No license is granted by implication or otherwise under any patents or other rights of TOSHIBA or the third parties. • Please contact your sales representative for product-by-product details in this document regarding RoHS compatibility. Please use these products in this document in compliance with all applicable laws and regulations that regulate the inclusion or use of controlled substances. Toshiba assumes no liability for damage or losses occurring as a result of noncompliance with applicable laws and regulations. 8 2007-01-31