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HA17431PNA

HA17431PNA

  • 厂商:

    HITACHI(日立)

  • 封装:

  • 描述:

    HA17431PNA - Regarding the change of names mentioned in the document, such as Hitachi Electric and H...

  • 数据手册
  • 价格&库存
HA17431PNA 数据手册
To all our customers Regarding the change of names mentioned in the document, such as Hitachi Electric and Hitachi XX, to Renesas Technology Corp. The semiconductor operations of Mitsubishi Electric and Hitachi were transferred to Renesas Technology Corporation on April 1st 2003. These operations include microcomputer, logic, analog and discrete devices, and memory chips other than DRAMs (flash memory, SRAMs etc.) Accordingly, although Hitachi, Hitachi, Ltd., Hitachi Semiconductors, and other Hitachi brand names are mentioned in the document, these names have in fact all been changed to Renesas Technology Corp. Thank you for your understanding. Except for our corporate trademark, logo and corporate statement, no changes whatsoever have been made to the contents of the document, and these changes do not constitute any alteration to the contents of the document itself. Renesas Technology Home Page: http://www.renesas.com Renesas Technology Corp. Customer Support Dept. April 1, 2003 Cautions Keep safety first in your circuit designs! 1. Renesas Technology Corporation puts the maximum effort into making semiconductor products better and more reliable, but there is always the possibility that trouble may occur with them. Trouble with semiconductors may lead to personal injury, fire or property damage. Remember to give due consideration to safety when making your circuit designs, with appropriate measures such as (i) placement of substitutive, auxiliary circuits, (ii) use of nonflammable material or (iii) prevention against any malfunction or mishap. Notes regarding these materials 1. These materials are intended as a reference to assist our customers in the selection of the Renesas Technology Corporation product best suited to the customer's application; they do not convey any license under any intellectual property rights, or any other rights, belonging to Renesas Technology Corporation or a third party. 2. Renesas Technology Corporation assumes no responsibility for any damage, or infringement of any third-party's rights, originating in the use of any product data, diagrams, charts, programs, algorithms, or circuit application examples contained in these materials. 3. All information contained in these materials, including product data, diagrams, charts, programs and algorithms represents information on products at the time of publication of these materials, and are subject to change by Renesas Technology Corporation without notice due to product improvements or other reasons. It is therefore recommended that customers contact Renesas Technology Corporation or an authorized Renesas Technology Corporation product distributor for the latest product information before purchasing a product listed herein. The information described here may contain technical inaccuracies or typographical errors. Renesas Technology Corporation assumes no responsibility for any damage, liability, or other loss rising from these inaccuracies or errors. Please also pay attention to information published by Renesas Technology Corporation by various means, including the Renesas Technology Corporation Semiconductor home page (http://www.renesas.com). 4. When using any or all of the information contained in these materials, including product data, diagrams, charts, programs, and algorithms, please be sure to evaluate all information as a total system before making a final decision on the applicability of the information and products. Renesas Technology Corporation assumes no responsibility for any damage, liability or other loss resulting from the information contained herein. 5. Renesas Technology Corporation semiconductors are not designed or manufactured for use in a device or system that is used under circumstances in which human life is potentially at stake. Please contact Renesas Technology Corporation or an authorized Renesas Technology Corporation product distributor when considering the use of a product contained herein for any specific purposes, such as apparatus or systems for transportation, vehicular, medical, aerospace, nuclear, or undersea repeater use. 6. The prior written approval of Renesas Technology Corporation is necessary to reprint or reproduce in whole or in part these materials. 7. If these products or technologies are subject to the Japanese export control restrictions, they must be exported under a license from the Japanese government and cannot be imported into a country other than the approved destination. Any diversion or reexport contrary to the export control laws and regulations of Japan and/or the country of destination is prohibited. 8. Please contact Renesas Technology Corporation for further details on these materials or the products contained therein. HA17431 Series Shunt Regulator ADE-204-049A (Z) Rev.1 Sep. 2002 Description The HA17431 series is temperature-compensated variable shunt regulators. The main application of these products is in voltage regulators that provide a variable output voltage. The on-chip high-precision reference voltage source can provide ±1% accuracy in the V versions, which have a VKA max of 16 volts. The HA17431VLP, which is provided in the MPAK-5 package, is designed for use in switching mode power supplies. It provides a built-in photocoupler bypass resistor for the PS pin, and an error amplifier can be easily constructed on the supply side. Features • The V versions provide 2.500 V ±1% at Ta = 25°C • The HA17431VLP includes a photocoupler bypass resistor (2 kΩ) • The reference voltage has a low temperature coefficient • The MPAK-5(5-pin), MPAK(3-pin) and UPAK miniature packages are optimal for use on high mounting density circuit boards • Car use is provided Block Diagram K PS* 2kΩ REF 2.500V + − A Note: * The PS pin is only provided by the HA17431VLP. HA17431 Series Application Circuit Example Switching power supply secondary-side error amplification circuit Vout R R1 K PS 2kΩ REF A HA17431VLP R2 GND + – Ordering Information Version Item Reference voltage (at 25°C) Accuracy Max Typ Min Cathode voltage Cathode current Car use V Version ±1% 2.525 V 2.500 V 2.475 V 16 V max 50 mA max HA17431VPJ HA17431PNAJ HA17431PAJ HA17431PJ HA17431FPAJ HA17431FPJ FP-8D TO-92MOD A Version ±2.2% 2.550 V 2.495 V 2.440 V 40 V max 150 mA max Normal Version ±4% 2.595 V 2.495 V 2.395 V 40 V max 150 mA max TO-92 –40 to +85°C Package Operating Temperature Range Rev.1, Sep. 2002, page 2 of 24 HA17431 Series Ordering Information (cont.) Version Item Industrial use V Version HA17431VLTP HA17432VLTP HA17431VLP HA17431VP HA17431PNA HA17431VUP HA17431UPA HA17432VUP HA17432UPA HA17431PA HA17431P HA17431FPA HA17431FP Commercial use HA17431UA HA17432UA UPAK FP-8D TO-92MOD UPAK MPAK-5 TO-92 A Version Normal Version Package MPAK Operating Temperature Range –20 to +85°C Pin Arrangement MPAK-5 NC 5 PS 4 MPAK (HA17431VLTP) A 3 MPAK (HA17432VLTP) A 3 UPAK (HA17431UA/UPA/VUP) A UPAK (HA17432UA/UPA/VUP) A 1 2 3 REF A K 1 REF 2 K K 1 2 REF 1 REF 2 A K 3 K 1 A 2 3 REF FP-8D TO-92 TO-92MOD REF 8 NC 7 A 6 NC 5 Mark side 1 2 3 Mark side 1 2 3 1 K 2 3 4 NC NC NC REF A K REF A K Rev.1, Sep. 2002, page 3 of 24 HA17431 Series Absolute Maximum Ratings (Ta = 25°C) Item Cathode voltage PS term. voltage Continuous cathode current Reference input current Power dissipation Operating temperature range Storage temperature Symbol VKA VPS IK Iref PT Topr HA17431VLP 16 VKA to 16 –50 to +50 –0.05 to +10 150 *4 –20 to +85 HA17431VP 16 — –50 to +50 –0.05 to +10 500 *5 –20 to +85 HA17431VPJ 16 — –50 to +50 –0.05 to +10 500 *5 –40 to +85 Unit V V mA mA mW °C 4, 5 Notes 1 1,2,3 Tstg –55 to +150 –55 to +150 –55 to +150 °C Item Cathode voltage PS term. voltage Continuous cathode current Reference input current Power dissipation Operating temperature range Storage temperature Symbol VKA VPS IK Iref PT Topr HA17431VUP/HA17432VUP 16 — –50 to +50 –0.05 to +10 800 *8 –20 to +85 HA17431VLTP/HA17432VLTP 16 — –50 to +50 –0.05 to +10 150 *4 –20 to +85 Unit V V mA mA mW °C Notes 1 1,2,3 4, 8 Tstg –55 to +150 –55 to +150 °C Item Cathode voltage Continuous cathode current Reference input current Power dissipation Operating temperature range Storage temperature Symbol VKA IK Iref PT Topr HA17431PNA 40 –100 to +150 –0.05 to +10 500 *5 –20 to +85 HA17431P/PA 40 –100 to +150 –0.05 to +10 800 *6 –20 to +85 HA17431FP/FPA 40 –100 to +150 –0.05 to +10 500 *7 –20 to +85 HA17431UA/UPA/ HA17432UA/UPA Unit V mA mA mW °C Notes 1 40 –100 to +150 –0.05 to +10 800 *8 –20 to +85 5,6,7,8 Tstg –55 to +150 –55 to +150 –55 to +125 –55 to +150 °C Rev.1, Sep. 2002, page 4 of 24 HA17431 Series Absolute Maximum Ratings (cont.) (Ta = 25°C) Item Cathode voltage Continuous cathode current Reference input current Power dissipation Operating temperature range Storage temperature Symbol VKA IK Iref PT Topr HA17431PNAJ 40 –100 to +150 –0.05 to +10 500 *5 –40 to +85 HA17431PJ/PAJ 40 –100 to +150 –0.05 to +10 800 *6 –40 to +85 HA17431FPJ/FPAJ 40 –100 to +150 –0.05 to +10 500 *7 –40 to +85 Unit V mA mA mW °C 5,6,7 Notes 1 Tstg –55 to +150 –55 to +150 –55 to +125 °C Notes: 1. Voltages are referenced to anode. 2. The PS pin is only provided by the HA17431VLP. 3. The PS pin voltage must not fall below the cathode voltage. If the PS pin is not used, the PS pin is recommended to be connected with the cathode. 4. Ta ≤ 25°C. If Ta > 25°C, derate by 1.2 mW/°C. 5. Ta ≤ 25°C. If Ta > 25°C, derate by 4.0 mW/°C. 6. Ta ≤ 25°C. If Ta > 25°C, derate by 6.4 mW/°C. 7. 50 mm × 50 mm × 1.5mmt glass epoxy board(5% wiring density), Ta ≤ 25°C. If Ta > 25°C, derate by 5 mW/°C. 8. 15 mm × 25 mm × 0.7mmt alumina ceramic board,Ta ≤ 25°C. If Ta > 25°C, derate by 6.4 mW/°C. Rev.1, Sep. 2002, page 5 of 24 HA17431 Series Electrical Characteristics HA17431VLP/VP/VPJ/VUP/VLTP, HA17432VUP/VLTP (Ta = 25°C, IK = 10 mA) Item Reference voltage Reference voltage temperature deviation Reference voltage temperature coefficient Reference voltage regulation Reference input current Reference current temperature deviation Minimum cathode current Off state cathode current Dynamic impedance Bypass resistance Bypass resistance temperature coefficient Symbol Vref Vref(dev) Min 2.475 — Typ 2.500 10 Max 2.525 — Unit V mV Test Conditions VKA = Vref VKA = Vref, Ta = –20°C to +85°C VKA = Vref, 0°C to 50°C gradient VKA = Vref to 16 V R1 = 10 kΩ, R2 = ∞ R1 = 10 kΩ, R2 = ∞, Ta = –20°C to +85°C VKA = Vref VKA = 16 V, Vref = 0 V VKA = Vref, IK = 1 mA to 50 mA IPS = 1 mA IPS = 1 mA, 0°C to 50°C gradient 3 3 2 1 Notes ∆Vref/∆Ta — ±30 — ppm/°C ∆Vref/∆VKA Iref Iref(dev) — — — 2.0 2 0.5 3.7 6 — mV/V µA µA Imin Ioff ZKA RPS ∆RPS/∆Ta — — — 1.6 — 0.4 0.001 0.2 2.0 +2000 1.0 1.0 0.5 2.4 — mA µA Ω kΩ ppm/°C Rev.1, Sep. 2002, page 6 of 24 HA17431 Series Electrical Characteristics (cont.) HA17431PJ/PAJ/FPJ/FPAJ/P/PA/UA/UPA/FP/FPA/PNA/PNAJ, HA17432UA/UPA (Ta = 25°C, IK = 10 mA) Item Reference voltage Symbol Vref Min 2.440 2.395 Reference voltage temperature deviation Vref(dev) — Typ 2.495 2.495 11 Max 2.550 2.595 (30) mV VKA = Vref Ta = –20°C to +85°C Ta = 0°C to +70°C mV/V µA µA VKA = Vref to 10 V VKA = 10 V to 40 V R1 = 10 kΩ, R2 = ∞ R1 = 10 kΩ, R2 = ∞, Ta = 0°C to +70°C VKA = Vref VKA = 40 V, Vref = 0 V VKA = Vref, IK = 1 mA to 100 mA 4 Unit V Test Conditions VKA = Vref Notes A Normal 1, 4 — Reference voltage regulation Reference input current Reference current temperature deviation Minimum cathode current Off state cathode current Dynamic impedance ∆Vref/∆VKA Iref Iref(dev) — — — — 5 1.4 1 3.8 0.5 (17) 3.7 2.2 6 (2.5) 1, 4 Imin Ioff ZKA — — — 0.4 0.001 0.2 1.0 1.0 0.5 mA µA Ω 2 Notes: 1. Vref(dev) = Vref(max) – Vref(min) Vref(max) Vref(dev) Vref(min) Ta Min Ta Max 2. Imin is given by the cathode current at Vref = Vref(IK=10mA) – 15 mV. 3. RPS is only provided in HA17431VLP. 4. The maximum value is a design value (not measured). Rev.1, Sep. 2002, page 7 of 24 HA17431 Series MPAK-5(5-pin), MPAK(3-pin) and UPAK Marking Patterns The marking patterns shown below are used on MPAK-5, MPAK and UPAK products. Note that the product code and mark pattern are different. The pattern is laser-printed. HA17431VLP NC (1) (2) HA17431VLTP A (1) (2) (4) HA17432VLTP A REF (1) (2) (4) HA17431UA 4 (1) HA17431UPA REF PS (4) A (2) 4 (1) B (2) 4 (a) P (b) (c) 3 (a) A (b) (c) 3 (a) B (b) (c) A Band mark K (3) (4) (5) A A Band mark K (3) (4) (5) A REF A K REF K K REF HA17432UA K HA17432UPA K HA17431VUP REF HA17432VUP K 4 (1) C (2) 4 (1) F (2) 4 (1) R (2) 4 (1) S (2) A Band mark REF (3) (4) (5) A A Band mark REF (3) (4) (5) A A Band mark K (3) (4) (5) A A Band mark REF (3) (4) (5) A Notes: 1. Boxes (1) to (5) in the figures show the position of the letters or numerals, and are not actually marked on the package. 2. The letters (1) and (2) show the product specific mark pattern. Product HA17431VLP HA17431VUP HA17432VUP HA17431VLTP HA17432VLTP HA17431UA HA17431UPA HA17432UA HA17432UPA (1) 4 4 4 3 3 4 4 4 4 (2) P R S A B A B C F 3. The letter (3) shows the production year code (the last digit of the year) for UPAK products. 4. The bars (a), (b) and (c) show a production year code for MPAK-5 and MPAK products as shown below. After 2010 the code is repeated every 8 years. Year (a) (b) (c) 2002 None None Bar 2003 None Bar None 2004 None Bar Bar 2005 Bar None None 2006 Bar None Bar 2007 Bar Bar None 2008 Bar Bar Bar 2009 None None None 5. The letter (4) shows the production month code (see table below). Production month Marked code Jan. A Feb. B Mar. C Apr. D May. E Jun. F Jul. G Aug. H Sep. J Oct. K Nov. L Dec. M 6. The letter (5) shows manufacturing code. For UPAK products. Rev.1, Sep. 2002, page 8 of 24 HA17431 Series Characteristics Curves HA17431VLP/VP/VPJ/VUP/VLTP, HA17432VUP/VLTP Reference Voltage Temperature Characteristics 2.575 Reference voltage Vref (V) 2.550 2.525 VK=Vref IK=10mA K 2.500 2.475 2.450 2.425 –20 REF A IK V Vref 0 20 40 60 80 85 Ambient temperature Ta (˚C) Cathode Current vs. Cathode Voltage Characteristics 1 1.0 VK=Vref Cathode Current vs. Cathode Voltage Characteristics 2 50 VK=Vref Cathode current IK (mA) 0.5 Cathode current IK (mA) 0 0 0 1 2 3 4 Cathode voltage VK (V) 5 1V/DIV –50 –5 0 Cathode voltage VK (V) 5 1V/DIV Rev.1, Sep. 2002, page 9 of 24 HA17431 Series Dynamic Impedance vs. Frequency Characteristics 100 Dynamic impedance ZKA (Ω) 10 K V VK 1 REF A IK io 0.1 iO = 2 mAP-P ZKA= VK (Ω) iO 0.01 100 1k 10k 100k 1M Frequency f (Hz) Open Loop Voltage Gain, Phase vs. Frequency Characteristics Open loop voltage gain GVOL (dB) 0 50 Phase delay ∅ (degrees) ∅ Vo 15kΩ 10µF –+ REF Vi A 8.2kΩ K 220Ω IK=10mA GVOL –180 0 –360 G = 20log 100 1k 10k 100k 1M 10M Vo (dB) Vi Frequency f (Hz) Rev.1, Sep. 2002, page 10 of 24 HA17431 Series HA17431PJ/PAJ/FPJ/FPAJ/P/PA/UA/UPA/FP/FPA/PNA/PNAJ, HA17432UA/UPA Oscillation Stability vs. Load Capacitance between Anode and Cathode 1.5 150 Cathode current IK (mA) 100 Stable region Oscillation region 50 CL VCC 0 0.0001 0.001 0.01 0.1 1.0 2.0 Load capacitance CL (µF) Open Loop Voltage Gain, Phase vs. Frequency Characteristics (1) (With no feedback capacitance) 60 GV IK = 10 mA 50 0 40 30 20 10 0 10 φ 90 220 Ω 15 kΩ 10 µF Vin 8.2 kΩ Open loop voltage gain GVOL (dB) Vout GND 180 100 1k 10 k 100 k Frequency f (Hz) Open Loop Voltage Gain, Phase vs. Frequency Characteristics (2) (When a feedback capacitance (Cf) is provided) IK = 5 mA Gυ Gυ 180 Cf = 0.022 µF 5 Cf = 0.22 µF 7.5 kΩ Open loop voltage gain GVOL (dB) 10 8 φ 270 0 Cf 200 µF 2k + Vout – 20 V 2.4 kΩ Vin 50 Ω 360 GND –4 10 100 1k 10 k Frequency f (Hz) Rev.1, Sep. 2002, page 11 of 24 Phase φ (degrees) Phase φ (degrees) HA17431 Series Reference Voltage Pin Input Current vs. Cathode Voltage Characteristics 2.5 2.0 1.5 1.0 IK = 10 mA 0.5 Reference voltage pin Input current Iref (µA) 0 5 10 15 20 25 30 35 40 Cathode voltage VK (V) Pulse Response 5 INPUT (P.G) Reference Voltage Temperature Characteristics 2.50 VKA = Vref IK = 10 mA 2.49 Input/Output voltage VI (V) 4 Reference voltage Vref (V) 5 6 2.48 2.47 2.46 2.45 2.44 –20 3 OUTPUT (Vout) 2 50 Ω 220 Ω Vout GND P.G f = 100 kHz 1 0 1 2 3 4 0 20 40 60 80 85 Time t (µs) Ambient temperature Ta (˚C) Rev.1, Sep. 2002, page 12 of 24 HA17431 Series Reference Voltage Pin Input Current Temperature Characteristics R1 = 10 kΩ R2 = ∞ IK = 10 mA Cathode Current vs. Cathode Voltage Characteristics (1) 150 120 Cathode current IK (mA) Reference voltage pin input current Iref (µA) 3 2.5 2 1.5 1 0.5 100 80 60 40 20 0 –20 –40 –60 –80 –100 –2 –1 0 1 2 3 Cathode voltage VK (V) VK = Vref Ta = 25˚C 0 –20 0 20 40 60 80 85 Ambient temperature Ta (˚C) Cathode Current vs. Cathode Voltage Characteristics (2) 1.2 Cathode current when off state Ioff (nA) Cathode Current Temperature Characteristics when Off State 2 VKA = 40 V Vref = 0 1.5 1.0 Cathode current IK (mA) VKA = Vref Ta = 25˚C 0.8 0.6 0.4 0.2 Imin 1 0 1 2 3 0.5 –20 0 20 40 60 80 85 Cathode voltage VK (V) Ambient temperature Ta (˚C) Rev.1, Sep. 2002, page 13 of 24 HA17431 Series Application Examples As shown in the figure on the right, this IC operates as an inverting amplifier, with the REF pin as input pin. The open-loop voltage gain is given by the reciprocal of “reference voltage deviation by cathode voltage change” in the electrical specifications, and is approximately 50 to 60 dB. The REF pin has a high input impedance, with an input current Iref of 3.8 µA Typ (V version: Iref = 2 µA Typ). The output impedance of the output pin K (cathode) is defined as dynamic impedance ZKA, and ZKA is low (0.2 Ω) over a wide cathode current range. A (anode) is used at the minimum potential, such as ground. K REF – + VCC OUT VEE VZ ≅ 2.5V A Figure 1 Operation Diagram Application Hints No. 1 Application Example Reference voltage generation circuit Vin R REF GND K CL A GND Vout Description This is the simplest reference voltage circuit. The value of the resistance R is set so that cathode current IK ≥ 1 mA. Output is fixed at Vout ≅ 2.5 V. The external capacitor CL (CL ≥ 3.3 µF) is used to prevent oscillation in normal applications. This is circuit 1 above with variable output provided. Here, Vout ≅ 2.5 V × (R1 + R2) R2 2 Variable output shunt regulator circuit Vin R R1 REF Iref Vout K CL A GND R2 GND Since the reference input current Iref = 3.8 µA Typ (V version: Iref = 2 µA Typ) flows through R1, resistance values are chosen to allow the resultant voltage drop to be ignored. Rev.1, Sep. 2002, page 14 of 24 HA17431 Series Application Hints (cont.) No. 3 Application Example Single power supply inverting comparator circuit VCC RL Rin Vin REF A GND GND K Vout Description This is an inverting type comparator with an input threshold voltage of approximately 2.5 V. Rin is the REF pin protection resistance, with a value of several kΩ to several tens of kΩ. RL is the load resistance, selected so that the cathode current IK • 1 mA when Vout is low. Condition Vin C1 Less then 2.5 V C2 2.5 V or more Vout IC VCC (VOH) OFF Approx. 2 V (VOL) ON 4 AC amplifier circuit VCC Cf R1 Vout Vin Cin R3 REF R2 GND R1 Gain G = (DC gain) R2 // R3 Cutoff frequency fc = 1 2π Cf (R1 // R2 // R3) K A RL This is an AC amplifier with voltage gain G = –R1 / (R2//R3). The input is cut by capacitance Cin, so that the REF pin is driven by the AC input signal, centered on 2.5 VDC. R2 also functions as a resistance that determines the DC cathode potential when there is no input, but if the input level is low and there is no risk of Vout clipping to VCC, this can be omitted. To change the frequency characteristic, Cf should be connected as indicated by the dotted line. 5 Switching power supply error amplification circuit R4 + – R1 (Note) Secondary side GND Cf R2 LED R3 V + This circuit performs control on the secondary side of a transformer, and is often used with a switching power supply that employs a photocoupler for offlining. The output voltage (between V+ and V–) is given by the following formula: Vout ≅ 2.5 V × (R1 + R2) R2 In this circuit, the gain with respect to the Vout error is as follows: G= R2 × HA17431 open × photocoupler loop gain total gain (R1 + R2) – V Note: LED : Light emitting diode in photocoupler R3 : Bypass resistor to feed IK(>Imin) when LED current vanishes R4 : LED protection resistance As stated earlier, the HA17431 open-loop gain is 50 to 60 dB. Rev.1, Sep. 2002, page 15 of 24 HA17431 Series Application Hints (cont.) No. 6 Application Example Constant voltage regulator circuit VCC R1 Q Vout R2 Cf GND R3 GND Description This is a 3-pin regulator with a discrete configuration, in which the output voltage Vout = 2.5 V × (R2 + R3) R3 R1 is a bias resistance for supplying the HA17431 cathode current and the output transistor Q base current. 7 Discharge type constant current circuit VCC R Q This circuit supplies a constant current of IL ≅ 2.5 V RS [A] into the load. Caution is required since the HA17431 cathode current is also superimposed on IL. The requirement in this circuit is that the cathode current must be greater than Imin = 1 mA. The IL setting therefore must be on the order of several mA or more. IL 2.5 V + Load RS GND – 8 Induction type constant current circuit VCC R + IL – Q In this circuit, the load is connected on the collector side of transistor Q in circuit 7 above. In this case, the load floats from GND, but the HA17431 cathode current is not superimposed on IL, so that IL can be kept small (1 mA or less is possible). The constant current value is the same as for circuit 7 above: IL ≅ 2.5 V RS [A] Load RS 2.5 V GND Rev.1, Sep. 2002, page 16 of 24 HA17431 Series Design Guide for AC-DC SMPS (Switching Mode Power Supply) Use of Shunt Regulator in Transformer Secondary Side Control This example is applicable to both forward transformers and flyback transformers. A shunt regulator is used on the secondary side as an error amplifier, and feedback to the primary side is provided via a photocoupler. Transformer R1 PWM IC HA17384 HA17385 SBD IF IB VF Phototransistor Photocoupler Light emitting diode HA17431 R2 R3 (+) Output V0 (–) VK C1 K A Vref R5 REF R4 GND Figure 2 Typical Shunt Regulator/Error Amplifier Determination of External Constants for the Shunt Regulator DC characteristic determination: In figure 2, R1 and R2 are protection resistor for the light emitting diode in the photocoupler, and R2 is a bypass resistor to feed IK minimum, and these are determined as shown below. The photocoupler specification should be obtained separately from the manufacturer. Using the parameters in figure 2, the following formulas are obtained: R1 = V0 – VF – VK V , R2 = F IF + IB IB VK is the HA17431 operating voltage, and is set at around 3 V, taking into account a margin for fluctuation. R2 is the current shunt resistance for the light emitting diode, in which a bias current IB of around 1/5 IF flows. Next, the output voltage can be determined by R3 and R4, and the following formula is obtained: V0 = R3 + R4 × Vref, Vref = 2.5 V Typ R4 The absolute values of R3 and R4 are determined by the HA17431 reference input current Iref and the AC characteristics described in the next section. The Iref value is around 3.8 µA Typ. (V version: 2 µA Typ) Rev.1, Sep. 2002, page 17 of 24 HA17431 Series AC characteristic determination: This refers to the determination of the gain frequency characteristic of the shunt regulator as an error amplifier. Taking the configuration in figure 2, the error amplifier characteristic is as shown in figure 3. G1 Gain G (dB) G2 When R5 ≠ 0 When R5 = 0 fOSC Frequency f (Hz) f1 fAC f2 * fOSC : PWM switching frequency Figure 3 HA17431 Error Amplification Characteristic In Figure 3, the following formulas are obtained: Gain G1 = G0 ≈ 50 dB to 60 dB (determined by shunt regulator) G2 = R5 R3 Corner frequencies f1 = 1/(2π C1 G0 R3) f2 = 1/(2π C1 R5) G0 is the shunt regulator open-loop gain; this is given by the reciprocal of the reference voltage fluctuation ∆Vref/∆VKA, and is approximately 50 dB. Rev.1, Sep. 2002, page 18 of 24 HA17431 Series Practical Example Consider the example of a photocoupler, with an internal light emitting diode VF = 1.05 V and IF = 2.5 mA, power supply output voltage V2 = 5 V, and bias resistance R2 current of approximately 1/5 IF at 0.5 mA. If the shunt regulator VK = 3 V, the following values are found. R1 = R2 = 5V – 1.05V – 3V = 316(Ω) (330Ω from E24 series) 2.5mA + 0.5mA 1.05V = 2.1(kΩ) (2.2kΩ from E24 series) 0.5mA Next, assume that R3 = R4 = 10 kΩ. This gives a 5 V output. If R5 = 3.3 kΩ and C1 = 0.022 µF, the following values are found. G2 = 3.3 kΩ / 10 kΩ = 0.33 times (–10 dB) f1 = 1 / (2 × π × 0.022 µF × 316 × 10 kΩ) = 2.3 (Hz) f2 = 1 / (2 × π × 0.022 µF × 3.3 kΩ) = 2.2 (kHz) Rev.1, Sep. 2002, page 19 of 24 HA17431 Series Package Dimensions As of January, 2002 Unit: mm 0.65 0.10 0.4 + 0.05 – 0.16 – 0.06 + 0.10 1.5 ± 0.15 + 0.2 – 0.6 0 – 0.1 0.95 0.95 1.9 ± 0.2 2.95 ± 0.2 0.3 + 0.2 1.1 – 0.1 0.65 2.8 Hitachi Code JEDEC JEITA Mass (reference value) MPAK — Conforms 0.011 g As of January, 2002 Unit: mm 1.9 ± 0.2 0.95 0.95 0.16 + 0.1 – 0.05 0.6 + 0.2 0.6 1.6 – 0.1 5 – 0.4 – 0.05 2.9 ± 0.2 0.3 + 0.1 + 0.2 1.1 – 0.1 0.2 2.8 + 0.3 – 0 – 0.1 Hitachi Code JEDEC JEITA Mass (reference value) MPAK-5 — — 0.015 g Rev.1, Sep. 2002, page 20 of 24 HA17431 Series As of January, 2002 Unit: mm 4.5 ± 0.1 0.4 1.8 Max φ1 1.5 ± 0.1 0.44 Max (2.5) (1.5) 1.5 1.5 3.0 0.8 Min 0.44 Max Hitachi Code JEDEC JEITA Mass (reference value) (0.4) 0.53 Max 0.48 Max 2.5 ± 0.1 4.25 Max UPAK — Conforms 0.050 g As of January, 2002 4.85 5.25 Max 5 8 (0.2) Unit: mm 1 4 4.4 *0.22 ± 0.05 0.20 ± 0.04 2.03 Max 0.75 Max 0.25 6.50 + 0.15 – 1.05 0˚ – 8˚ 0.10 ± 0.10 1.27 *0.42 ± 0.08 0.40 ± 0.06 0.25 0.60 + 0.18 – 0.15 0.12 M *Dimension including the plating thickness Base material dimension Hitachi Code JEDEC JEITA Mass (reference value) FP-8D — Conforms 0.10 g Rev.1, Sep. 2002, page 21 of 24 HA17431 Series As of January, 2002 Unit: mm 4.8 ± 0.3 3.8 ± 0.3 2.3 Max 0.55 Max 0.7 0.60 Max 12.7 Min 5.0 ± 0.2 0.5 Max 1.27 2.54 Hitachi Code JEDEC JEITA Mass (reference value) TO-92 (1) Conforms Conforms 0.25 g Rev.1, Sep. 2002, page 22 of 24 HA17431 Series As of January, 2002 Unit: mm 4.8 ± 0.4 3.8 ± 0.4 0.65 ± 0.1 0.75 Max 0.55 Max 0.60 Max 2.3 Max 0.7 10.1 Min 8.0 ± 0.5 0.5 Max 1.27 2.54 Hitachi Code JEDEC JEITA Mass (reference value) TO-92 Mod — Conforms 0.35 g Rev.1, Sep. 2002, page 23 of 24 HA17431 Series Disclaimer 1. Hitachi neither warrants nor grants licenses of any rights of Hitachi’s or any third party’s patent, copyright, trademark, or other intellectual property rights for information contained in this document. Hitachi bears no responsibility for problems that may arise with third party’s rights, including intellectual property rights, in connection with use of the information contained in this document. 2. Products and product specifications may be subject to change without notice. Confirm that you have received the latest product standards or specifications before final design, purchase or use. 3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. However, contact Hitachi’s sales office before using the product in an application that demands especially high quality and reliability or where its failure or malfunction may directly threaten human life or cause risk of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation, traffic, safety equipment or medical equipment for life support. 4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly for maximum rating, operating supply voltage range, heat radiation characteristics, installation conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable failure rates or failure modes in semiconductor devices and employ systemic measures such as failsafes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other consequential damage due to operation of the Hitachi product. 5. This product is not designed to be radiation resistant. 6. No one is permitted to reproduce or duplicate, in any form, the whole or part of this document without written approval from Hitachi. 7. Contact Hitachi’s sales office for any questions regarding this document or Hitachi semiconductor products. Sales Offices Hitachi, Ltd. Semiconductor & Integrated Circuits Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan Tel: (03) 3270-2111 Fax: (03) 3270-5109 URL http://www.hitachisemiconductor.com/ For further information write to: Hitachi Semiconductor (America) Inc. 179 East Tasman Drive San Jose,CA 95134 Tel: (408) 433-1990 Fax: (408) 433-0223 Hitachi Europe Ltd. Electronic Components Group Whitebrook Park Lower Cookham Road Maidenhead Berkshire SL6 8YA, United Kingdom Tel: (1628) 585000 Fax: (1628) 585200 Hitachi Europe GmbH Electronic Components Group Dornacher Straße 3 D-85622 Feldkirchen Postfach 201, D-85619 Feldkirchen Germany Tel: (89) 9 9180-0 Fax: (89) 9 29 30 00 Hitachi Asia Ltd. Hitachi Tower 16 Collyer Quay #20-00 Singapore 049318 Tel : -6538-6533/6538-8577 Fax : -6538-6933/6538-3877 URL : http://semiconductor.hitachi.com.sg Hitachi Asia Ltd. (Taipei Branch Office) 4/F, No. 167, Tun Hwa North Road Hung-Kuo Building Taipei (105), Taiwan Tel : -(2)-2718-3666 Fax : -(2)-2718-8180 Telex : 23222 HAS-TP URL : http://www.hitachi.com.tw Hitachi Asia (Hong Kong) Ltd. Group III (Electronic Components) 7/F., North Tower World Finance Centre, Harbour City, Canton Road Tsim Sha Tsui, Kowloon Hong Kong Tel : -2735-9218 Fax : -2730-0281 URL : http://semiconductor.hitachi.com.hk Copyright © Hitachi, Ltd., 2002. All rights reserved. Printed in Japan. Colophon 6.0 Rev.1, Sep. 2002, page 24 of 24
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