NR301E APPLICATION NOTE NR301E Application Note Rev.1.3 Rev.1.3 SANKEN ELECTRIC CO., LTD. http://www.sanken-ele.co.jp Copy Right: SANKEN ELECTRIC CO., LTD. Page.1 NR301E APPLICATION NOTE Rev.1.3 CONTENS General Descriptions ------------------------------------------------------------------------- 3 1. Electrical Characteristics ----------------------------------------------------------------- 4 1.1 Absolute Maximum Ratings ------------------------------------------------------------ 4 1.2 Recommended Operating Conditions ----------------------------------------------- 4 1.3 Electrical Characteristics --------------------------------------------------------------- 5 2. Block Diagram & Pin Functions--------------------------------------------------------- 6 2.1 Functional Block Diagram -------------------------------------------------------------- 6 2.2 Pin Assignments & Functions --------------------------------------------------------- 6 3. Example Application Circuit ------------------------------------------------------------- 7 4. Allowable package power dissipation ------------------------------------------------- 8 5. Pattern Design ------------------------------------------------------------------------------ 8 6. Package Outline ---------------------------------------------------------------------------- 9 7. Marking of NR301E ---------------------------------------------------------------------- 10 8. Operational Descriptions --------------------------------------------------------------- 11 8.1 Constant vboltage control ------------------------------------------------------------ 11 8.2 Over current protection ---------------------------------------------------------------- 11 8.2 Thermal protection --------------------------------------------------------------------- 11 9. A precaution in design ------------------------------------------------------------------ 13 9.1 About the selection of the input and output capacitor (CIN and COUT). --- 13 9.2 About handling of the ADJ-terminal ------------------------------------------------ 13 9.3 About handling of the Vc-terminal -------------------------------------------------- 13 9.4 About reverse bias protection diode ----------------------------------------------- 13 IMPORTANT NOTICE---------------------------------------------------------------------- 14 Copy Right: SANKEN ELECTRIC CO., LTD. Page.2 NR301E APPLICATION NOTE Rev.1.3 General Descriptions Package NR301E is the low saturation voltage type Io=1.0A linear regulator IC built in the exposed SOIC8 package. The output voltage Vo is adjustable by the external resistor. ● ● ● Package Name：Exposed SOIC 8 Exposed pad is a radiator on back-side of package. Surface mount 8-pin package In this IC, start-up and shut-down are possible by the external signal input. Over-current protection and thermal protection are built in as a protection function. A low-ESR capacitor like a ceramics capacitor can be used for the output capacitor. Features & Benefits ● The output voltage is adjustable by the external resistor. ● Start-up and shut-down are possible when a VC terminal is used.( External signal input) ● Ceramics capacitor is possible to use as the output capacitor . ● Protection Functions －Over current protection(OCP) －Thermal protection with temperature hysteresis . (TSD) Pin Assign Electrical Characteristics ● ● ● ● Input voltage: Vin=2.7V to 27V（Recommeded） Reference voltage:VFB = 1.0V ±1.5% Output current: Io= 1.0A Difference in input and output:VDIF = typ. 0.6V Applications ● ● ● ● For local regulator circuit LCD-TV/STB/DVD/Blu-Ray Audio/PC USBoutput protection Series Lineup Product Name Vin(max) Io(max) Vc(on/off) VDIF NR301E 30V 1A 2V/0.6V 0.6V@1A,[email protected] Copy Right: SANKEN ELECTRIC CO., LTD. Page.3 NR301E APPLICATION NOTE Rev.1.3 1. Electrical Characteristics Refer to a product specification sheet for contents of details. Based on the IC, each current value is prescribed: polarity”－“ is the source current, “+” polarity is the sink current. 1.1 Absolute Maximum Ratings Table1 Absolute Maximum Ratings （The condition when there is no special mention: Ta=25°C） Parameter terminal Symbol Ratings Units DC input voltage 4−8 Vin 30 V Vc terminal voltage 4−5 VC 30 V 4−3 VADJ 5.0 V ― PD 1.4 W Thermal Resistance(junction to ambient Air) ― θj-a 71 °C/W Thermal Resistance（junction to Pin No.4） ― θj-L 26 °C/W ― TJ(max) −40～+125 °C ― Tstg −40～+125 °C ADJ terminal voltage Power Dissipation Junction temperature (1) (2) Strage temperature (1) (2) Conditions Vc≦Vin Glass-epoxy board mounting in a 30×30mm. (copper area in a 25×25mm) This product builds in an thermal protection circuit. When junction-temperature is more than 135℃,thermal protection often works. Limited by thermal shutdown. The temperature detection of thermal shutdown is about 155°C (Typical). 1.2 Recommended Operating Conditions Operating IC in recommended operating conditions is required for normal operating of circuit functions shown in Table 3 Electrical characteristics of NR301E. Table2 Recommended operating conditions of NR301E.(The condition when there is no special mention: Ta=25°C） Parameter terminal Symbol Ratings MIN MAX Units Input voltage range (1) 4−8 Vin 2.7 27 V Output current range (１) 4−8 IO 0 1.0 A Output voltage range ― VO 1.1 16 V Ambient operating temperature ― TOP(a) -30 85 °C Junction operating temperature (1) °C TOP(j) -30 100 ― Vin and Io are restricted by the use condition because there are relations of PD= (Vin-Vo) ×Io. Copy Right: SANKEN ELECTRIC CO., LTD. Page.4 Conditions Refer to Page7fig4. NR301E APPLICATION NOTE Rev.1.3 1.3 Electrical Characteristics Electrical characteristics indicate specific limits, which are guaranteed when IC is operated under the measurement conditions shown in the circuit diagram (fig. 1) Table3 NR301E Electrical Characterristics (The condition when there is no special mention: Vin＝VO+1V， VO＝5V(typ)：R1=10kΩ, R2=39k+1k、Ta= 25°C) Parameter Symbol Ratings Units Conditions MIN TYP MAX VADJ 0.985 1.00 1.015 V Line regulation ΔVLINE ― 25 50 mV Vin=6~15V，Io=10mA Load regulation ΔVLOAD ― 30 60 mV Io=0～1A ― 0.3 0.4 V Io=0.5A ― 0.6 0.8 V Io=1A Reference voltage Io=10mA Difference in input and output ΔVDIF Supply Current(Non-operating) Iq 0.5 0.9 1.6 mA Io=0mA，VC=2V Iq(OFF) ― 0 1 uA VC=0V ΔVo/ΔTa ― ±0.5 ― R.REJ ― 55 ― Shutdown Supply Current Output voltage temperature coefficient Power supply rejection ratio mV/°C Tj=0～100°C dB Vo=5V，Io=0.1A， ｆ=100～120Hz Output voltage Vo :ON VC(H) 2.0 ― ― V Io=10mA control terminal Vo:OFF VC(L) ― ― 0.6 V Io=10mA voltage *2 Output voltage Vo:ON VC(IH) ― 4 40 uA VC=2.0V control terminal Vo:OFF VC(IL) -2 0 0.1 uA VC=0V current *2 Over current protection IS1 1.1 ― ― A Vin=7V threshold *3 Thermal shutdown threshold TSD 135 155 °C ― ― temperature Thermal shutdown TSD(HYS) ― 50 ― °C ― restart hysteresis of temperature *2 The internal circuit of the Vc-terminal is high impedance, To avoid a un-stable condition, the Vc-terminal must surely pull-up or pull-down. Because Vc-terminal input level is equal to the LS-TTL, therefore direct-drive is possible. *3 Is1 is prescribed that the output voltage Vo descend to -5%. NR301E *V3 contains a voltmeter and an ammeter. fig.1 NR301E Measurement circuit diagram Copy Right: SANKEN ELECTRIC CO., LTD. Page.5 NR301E APPLICATION NOTE Rev.1.3 2. Block Diagram & Pin Functions 2.1 Functional Block Diagram Vin 8 1 Vout Vo OCP Drv BGRef Vc 5 2 ADJ OTA + Vadj + Vc - 2V/0.6V + + 155℃ OVP TSD - - GND 3 4 NC 6 NC 1.1Vadj Hys50℃ 7 NC NR301E Block Diagram Fig.2 NR301E Function Block Diagram 2.2 Pin Assignments & Functions fig.3 NR301E Pin assignments Table4 NR301E Pin assign & function Pin No. Symbol Description 1 VO Output voltage 2 ADJ Output voltage adjustment 3 GND Ground 4 NC No connection 5 VC Output ON/OFF control 6 NC No connection 7 NC No connection 8 Vin Back side FIN Input voltage Sub- straight (Ground) *Exposed thermal pad Copy Right: SANKEN ELECTRIC CO., LTD. Page.6 NR301E APPLICATION NOTE Rev.1.3 3. Example Application Circuit Input capacitor C1 & output capacitor C2 For stable movement,You must connect a capacitor C1 in the shortest distance between Vin-terminal and GND-terminal. In the same way, Connect a capacitor C2 between Vo-terminal and GND-terminal. Do decoupling with a low ESR capacitor such as a ceramics capacitor. A capacitor has the dispersion of the capacitance and has a temperature character. Especially, as for the ceramics capacitor , Capacity decreases by the input voltage. Especially, as for the ceramics capacitor , In that character, Capacitance decreases by the input voltage value. Please select the capacitor which has good DC-bias character,and use it on the condition of enough voltage margin. About the heat-radiation design. NR301E adopts an exposed SOIC 8 package because of the heat-radiation effect improvement. Because heat-slag on the back side of the IC becomes radiator, soldering with copper foil pattern of PCB becomes a premise. Refer to the temperature derating curve of page10 for the details. D1 1 Vo Vin 8 2 ADJ 3 GND Load R2 NR301E C2 R1 NC 7 C1 NC 6 R3 Vin Vc 5 4 NC Vo_H fig.4 NR301E example application circuit In case of the Vo=5V and Vin=6V. C1、C2 ：1uF/16V R1、R2 ：It is controlled so that ADJ-GND voltage may be 1V (typ). R1：39k+1k(A resistor for the fine tuning), R2：10k R3 ：About handling of the Vc terminal function . case1）If you don't use Vc function ( Vo normally ON ), Vc must connect to Vin directly with R3= 0Ω. case2）If you use Vc function (Vo ON/OFF) by TTL-Logic signal, R3 is unnecessary. Input a TTL-Logic signal to Vc directly. case3）If you use Vc function (Vo ON/OFF) by the condition of open-collector or open-drain, You must connect pull-up resistor R3 between Vin and Vc. * How to calculate R3 in case3 In the condition of Vc>Vc(H), the output turns on. And, calculate R3 in accordance with the following equation because internal-impedance between Vc and GND is RVC=50kΩ (Min). R3＜RVC×(VIN－Vc(H))／Vc(H) D1 And, Vc (H) =2V (Min). When the VIN is supposed to be 12V , it become the relations of "R3<250kΩ" by "R3<50kΩ× (12V-2V) /2V". Vc(IH), the maximum sink current of the Vc terminal is 40μA. In the condition of Vc=2V, the current which can be supplied from R3 is should be larger than "40μA". Therefore, if the R3 is 200kΩ, it becomes 50μA by "Vc(IH)=(12V－2V)／200kΩ". ： Diode for the reverse bias protection. When relations between the input voltage and the output voltage are reversed (Vin<Vo),this diode is necessary. Copy Right: SANKEN ELECTRIC CO., LTD. Page.7 NR301E APPLICATION NOTE Rev.1.3 4. Allowable package power dissipation Temperature derating curve 1.6 Glass-epoxy board mounting in a 30×30mm 1.4 許容損失 PD [W] Power Dissipation 1.2 1 0.8 copper area : 25×25mm 0.6 0.4 0.2 0 -25 0 25 50 周囲温度 Ta [℃ ] Ambient Temperature 75 100 125 fig.5 NR301E temperature derating curve Note: The power dissipation is calculated at the junction temperature 125 °C 5. Pattern Design VIN Vc Note: Size of the PCB is about GND R3 C1 28mm×40mm t=1.6mm (double sided board, copper foil thickness=35μm) NR301E GND C2 R1-1 Vo R2 R1-2 Adj Front side(Component Side) Back side(Ground plain) fig.6 Recommended pattern layout Note: 1) Dimension is in millimeters, dimension in bracket is in inches. 2) Drawing is not to scale. fig.7 Recommended land pattern Copy Right: SANKEN ELECTRIC CO., LTD. Page.8 NR301E APPLICATION NOTE Rev.1.3 6. Package Outline eSOIC 8 package An outside size is supplied by either Package type A or Package type B. Top View Bottom View fig.8 Package outline Outside size table. Symbol Package A Package B MIN TYP MAX MIN TYP MAX A1 0 － 0.1524 ０ 0.10 0.15 A2 1.398 1.448 1.498 1.25 1.40 1.65 ｂ 0.330 － 0.508 0.38 － 0.51 D 4.80 4.902 5.004 4.80 4.90 5.00 D1 3.053 3.18 3.307 3.10 3.30 3.50 E 5.893 － 6.918 5.80 6.00 6.20 E1 3.73 － 3.89 3.80 3.90 4.00 E2 2.033 2.16 2.287 2.20 2.40 2.60 ｅ － 1.27 － － 1.27 － Ｌ 0.508 － 0.762 0.45 0.60 0.80 Note: 1) Dimension is in millimeters. 2) Drawing is not to scale. Copy Right: SANKEN ELECTRIC CO., LTD. Page.9 NR301E APPLICATION NOTE Rev.1.3 7.Marking of NR301E Laser marking, specifications are based on the following. *1. Product number *1 *2. Lot number (three digit) 1st letter : The last digit of the year 2nd letter : Month January to September : 1 to 9 October : O November : N December : D 3rd letter : manufacturing week First week to 5th week : 1 to 5 *3. Control number (four digit) Copy Right: SANKEN ELECTRIC CO., LTD. NR301E SK *2 *3 fig.9 marking specification Page.10 NR301E APPLICATION NOTE Rev.1.3 8. Operational Descriptions The characteristic numerical value of the case without special mention writes typ value according to the specifications of NR311E. Based on the IC, each current value prescribes... "Positive : +"= sink current. "Negative : －"= source current. 8.1 Constant vboltage control A regulator IC is composed of the reference voltage, the error amplifier, the series pass element, and so on. A series pass element is Linear-controlled by the error amplifier, the internal reference voltage correspond to the ADJ terminal voltage. NR301E does stabilize the output voltage by controlling the source-drain voltage of PchMOSFET which becomes a series pass element. Therefore, enough radiation design is necessary because the multiplication of the source-drain voltage and output current becomes internal loss. And, the output-voltage is prescribed these items, the load-regulation, the line-regulation, the temperature coefficient. 8.2 Over current protection Is1 Vout [V] NR301E builds in the over-current protection of Fold-back type. Is1: The current when Over-current protection is started. Is2: The current when the load is short-circuited . Is2<<Is1 …refer to fig.10. By this characteristic, as for the loss of the IC under the condition when the load is short-circuited, (VIN×Io)loss becomes smaller than the constant-current type over-current protection. When an IC starts, and when the voltage of the output capacitor is 0V, the output voltage rises from the over-electric current protection condition. Fold-back type over-current protection is suitable for the constant-resistance load and high-impedance load. Therefore, be careful in case of the load type and the circuit composition (1)-(4), because the output voltage can't rise up normally. (1) Constant-current load. (2) Positive & negative dual output power supply. (3) Constant-voltage & constant-current power supply Composition. (4) A change of the GND-terminal voltage for the output voltage adjustment. Is2 Iout [A] fig.10 Fold-back OCP characteristic NR301E builds in an thermal protection circuit with temperature hysteresis. When junction-temperature inside of the IC gets over at 155℃(typ), then the IC is shut down by turning off the output transistor. The thermal protection function has temperature hysteresis of about 50℃. After the IC shut down, the IC restarts when the junction-temperature descends at about 100℃. And, because there is dispersion in the thermal protection circuit and the lower limit of protection start temperature is 135℃, the heat radiation design which doesn't usually begin thermal protection under the normal operation is necessary. Even a maximum condition, you must do the heat radiation design which goes into the one within Tj< 125℃. Vout [V ] 8.3 Thermal protection Junction Temprature [℃] fig.11 Examlpe characteristic of thermal protection circuit Copy Right: SANKEN ELECTRIC CO., LTD. Page.11 NR301E APPLICATION NOTE Rev.1.3 *precaution So that an IC may avoid suffering big damage due to a fever which occurs when load is short-circuited in the moment, the thermal protection is a purpose to protect an IC from thermal runaway. In the condition that is long imprudence and a continuous fever , a movement including that reliability isn't assured. Copy Right: SANKEN ELECTRIC CO., LTD. Page.12 NR301E APPLICATION NOTE Rev.1.3 9. A precaution in design 9.1 About the selection of the input and output capacitor (CIN and COUT). Power supply impedance is raised when long wiring from the input capacitor CIN to the input-terminal Vin of the IC. To plan the stable movement of the IC, it is recommended connecting an input capacitor CIN to the input-terminal Vin in shortest distance. Select the capacitor whose equivalent serial resistance (ESR) is low, because impedance of the capacitor must be lowered fully, too. For the confirmation of the movement stability, evaluation and examination are necessary with an actual circuit board. As a recommendation value of CIN, capacitance becomes the ceramics capacitor beyond 1uF or the electrolytic capacitor of about 22uF. The internal phase compensation is influenced by the capacitance of the output capacitor Cout. Because of that, more than recommendation capacitance value (with a ceramics capacitor and so on, beyond 1uF) is necessary for Cout. You must use the good kind of the DC bias character in low ESR, and connect it in the shortest distance of the IC output terminal Vo. And, in case of the capacitor whose temperature character of ESR isn't good, though it becomes stable movement in the room-temperature, a unusual oscillation may occur at a low-temperature. Because of this, we can't recommend that use of an electrolytic capacitor only. 9.2 About handling of the ADJ-terminal An ADJ terminal is the feedback signal input terminal to control the output voltage. R1 and R2 are connected between the output voltage terminal Vo and the GND terminal, and output voltage is set up. Though the current of R1 and R2 is feedback-current. Set up a feedback-current that becomes about 100μA. The ADJ terminal voltage of NR301E is 1.00V (typ). 1V/100μA=10kΩ becomes recommendation value of R2. As for the output voltage Vo, Calculate R1 by the next equation under the condition of R2=10kΩ and VADJ=1.00V (typ). Vo R1 R 2 Vo Vadj Vadj R1 R2 R2 Vadj (Calculation example) In case of a setup of Vo=5V : R1=10kΩ×(5V-1V)/1V=40kΩ ・・・If 40kΩ is used as R1, Vo becomes 5V. When there is no result of a calculation of R1 in the Exx series, Divide resistance into two like 39kΩ + 1kΩ (for the fine tuning), and adjust resistance value. And, a absolute maximum rating of ADJ-terminal is 5.5V. When the IC usually works, 1.00V (typ) is being inputted by the resistor divider of R1 and R2. Don't input voltage forcibly under such condition from the outside. If there is a condition which gets over a absolute maximum rating, Clamp the ADJ terminal voltage in less than 5.5V by use of zenner-diode. 9.3 About handling of the Vc-terminal Pin-No.5 is an output control function in the NR301E As a condition of Vc-terminal input voltage, Vc＞2V : RUN (The IC is started.) Vc＜0.6V : STOP(The IC is stopped.) Because of the reduction of consumption-current, a Vc-terminal is being done PULL-DOWN by the high impedance. Therefore a Vc-terminal must be terminated. A connection is directly possible because withstand-voltage of the Vc-terminal is the same as the Vin terminal. *Refer to CASE1-3 in the page 7 for the details. 9.4 About reverse bias protection diode As for the NR301E, because a series pass transistor is Pch-MOSFET. Therefore the parasitic diode exists between Vo and Vin. When the IC usually works, it is the condition of Vin>Vo.When the input power supply voltage is lowered rapidly, it becomes the condition of Vin<Vo. In such case, the surge-current flow to the parasitic diode. This product are not the specifications which parasitic diode is used for actively. When there is a reverse bias condition, Connect protection diode to between Vo and Vin. （Refer to fig.4-Page7:D1）. Copy Right: SANKEN ELECTRIC CO., LTD. Page.13 NR301E APPLICATION NOTE Rev.1.3 IMPORTANT NOTICE The contents in this document are subject to changes, for improvement and other purposes, without notice. Make sure that this is the latest revision of the document before use. Application and operation examples described in this document are quoted for the sole purpose of reference for the use of the products herein and Sanken can assume no responsibility for any infringement of industrial property rights, intellectual property rights or any other rights of Sanken or any third party which may result from its use. Although Sanken undertakes to enhance the quality and reliability of its products, the occurrence of failure and defect of semiconductor products at a certain rate is inevitable. Users of Sanken products are requested to take, at their own risk, preventative measures including safety design of the equipment or systems against any possible injury, death, fires or damages to the society due to device failure or malfunction. Sanken products listed in this document are designed and intended for the use as components in general purpose electronic equipment or apparatus (home appliances, office equipment, telecommunication equipment, measuring equipment, etc.). When considering the use of Sanken products in the applications where higher reliability is required (transportation equipment and its control systems, traffic signal control systems or equipment, fire/crime alarm systems, various safety devices, etc.), please contact your nearest Sanken sales representative to discuss, prior to the use of the products herein. The use of Sanken products without the written consent of Sanken in the applications where extremely high reliability is required (aerospace equipment, nuclear power control systems, life support systems, etc.) is strictly prohibited. In the case that you use Sanken semiconductor products or design your products by using Sanken semiconductor products, the reliability largely depends on the degree of derating to be made to the rated values. Derating may be interpreted as a case that an operation range is set by derating the load from each rated value or surge voltage or noise is considered for derating in order to assure or improve the reliability. In general, derating factors include electric stresses such as electric voltage, electric current, electric power etc., environmental stresses such as ambient temperature, humidity etc. and thermal stress caused due to self-heating of semiconductor products. For these stresses, instantaneous values, maximum values and minimum values must be taken into consideration. In addition, it should be noted that since power devices or IC’s including power devices have large self-heating value, the degree of derating of junction temperature affects the reliability significantly. When using the products specified herein by either (i) combining other products or materials therewith or (ii) physically, chemically or otherwise processing or treating the products, please duly consider all possible risks that may result from all such uses in advance and proceed therewith at your own responsibility. Anti radioactive ray design is not considered for the products listed herein. Sanken assumes no responsibility for any troubles, such as dropping products caused during transportation out of Sanken’s distribution network. The contents in this document must not be transcribed or copied without Sanken’s written consent. Copy Right: SANKEN ELECTRIC CO., LTD. Page.14