LM117HVK-QML

LM117HVQML 3-Terminal Adjustable Regulator February 13, 2008 LM117HVQML 3-Terminal Adjustable Regulator General Description The LM117HV are adjustable 3-terminal positive voltage regulators capable of supplying either 0.5A or 1.5A over a 1.2V to 57V output range. They are exceptionally easy to use and require only two external resistors to set the output voltage. Further, both line and load regulation are better than standard fixed regulators. In addition to higher performance than fixed regulators, the LM117HV series offers full overload protection available only in IC's. Included on the chip are current limit, thermal overload protection and safe area protection. All overload protection circuitry remains fully functional even if the adjustment terminal is disconnected. Normally, no capacitors are needed unless the device is situated more than 6 inches from the input filter capacitors in which case an input bypass is needed. An optional output capacitor can be added to improve transient response. The adjustment terminal can be bypassed to achieve very high ripple rejections ratios which are difficult to achieve with standard 3-terminal regulators. Besides replacing fixed regulators, the LM117HV is useful in a wide variety of other applications. Since the regulator is “floating” and sees only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long as the maximum input to output differential is not exceeded, i.e. do not short the output to ground. Also, it makes an especially simple adjustable switching regulator, a programmable output regulator, or by connecting a fixed resistor between the adjustment and output, the LM117HV can be used as a precision current regulator. Supplies with electronic shutdown can be achieved by clamping the adjustment terminal to ground which programs the output to 1.2V where most loads draw little current. Features ■ Available with radiation guarantee ■ ■ ■ ■ ■ ■ ■ ■ 100 krad(Si) — Total Ionizing Dose 100 krad(Si) — Low Dose Rate Qualified Adjustable output down to 1.2V Guaranteed 0.5A or 1.5A output current Line regulation typically 0.01%/V Load regulation typically 0.1% Current limit constant with temperature Eliminates the need to stock many voltages 80 dB ripple rejection Output is short-circuit protected Ordering Information NS Part Number LM117HVH/883 LM117HVH-QML LM117HVHRQMLV (Note 7) LM117HVHRLQMLV (Note 8) Low Dose Rate Qualified LM117HVK/883 LM117HVK-QML LM117HVWG-QML LM117HVWGRQMLV (Note 7) LM117HVWGRLQMLV (Note 8) Low Dose Rate Qualified 5962-0722903QYA 5962-0722901QZA 5962R0722901VZA 100 krad(Si) 5962R0722961VZA 100 krad(Si) 5962-0722901QXA 5962R0722901VXA 100 krad(Si) 5962R0722961VXA 100 krad(Si) SMD Part Number NS Package Number H03A H03A H03A H03A K02C K02C WG16A WG16A WG16A Package Description 3LD T0–39 Metal Can 3LD T0–39 Metal Can 3LD T0–39 Metal Can 3LD T0–39 Metal Can 2LD T0–3 Low Profile Metal Can 2LD T0–3 Low Profile Metal Can 16LD Ceramic SOIC 16LD Ceramic SOIC 16LD Ceramic SOIC © 2008 National Semiconductor Corporation 201438 www.national.com LM117HVQML Connection Diagrams (See Physical Dimension section for further information) (TO-39) Metal Can Package 20143830 CASE IS OUTPUT Bottom View See NS Package Number H03A (TO-3) Metal Can Package 20143829 CASE IS OUTPUT Bottom View See NS Package Number K02C Ceramic SOIC Chip Carrier 20143804 Top View See NS Package Number WG16A (Note 4) www.national.com 2 LM117HVQML LM117HV Series Packages Part Number Suffix H K WG Package T0–39 TO-3 Ceramic SOIC Design Load Current 0.5A 1.5A 0.5A Schematic Diagram 20143808 3 www.national.com LM117HVQML Absolute Maximum Ratings (Note 1) Power Dissipation (Note 2) Input - Output Voltage Differential Maximum Junction Temperature Storage Temperature Lead Temperature (Soldering, 10 sec.) Thermal Resistance  θJA T0-3 Metal Can - Still Air T0-3 Metal Can - 500LF/Min Air flow T0-39 Metal Can - Still Air T0-39 Metal Can - 500LF/Min Air flow Ceramic SOIC - Still Air Ceramic SOIC - 500LF/Min Air flow  θJC T0-3 Metal Can T0-39 Metal Can Ceramic SOIC (Note 5) ESD Tolerance (Note 3) Internally limited +60V, −0.3V +150°C −65°C ≤ TA ≤ +150°C 300°C 39°C/W 14°C/W 186°C/W 64°C/W 115°C/W 66°C/W 1.9°C/W 21°C/W 3.4°C/W 2000V Recommended Operating Conditions Operating Temperature Range −55°C ≤ TA ≤ +125°C Quality Conformance Inspection Mil-Std-883, Method 5005 - Group A Subgroup 1 2 3 4 5 6 7 8A 8B 9 10 11 12 13 14 Description Static tests at Static tests at Static tests at Dynamic tests at Dynamic tests at Dynamic tests at Functional tests at Functional tests at Functional tests at Switching tests at Switching tests at Switching tests at Settling time at Settling time at Settling time at Temp °C 25 125 -55 25 125 -55 25 125 -55 25 125 -55 25 125 -55 www.national.com 4 LM117HVQML LM117HVH, HVWG Electrical Characteristics DC Parameters The following conditions apply, unless otherwise specified. VDiff = (VI − VO), IL = 8mA, VOUT = 1.25V (Nominal) Symbol IAdj Parameter Adjustment Pin Current VDiff = 3V VDiff = 3.3V VDiff = 40V IQ Minimum Load Current VDiff = 3V, VO = 1.7V VDiff = 3.3V, VO = 1.7V VI = 40V, VO = 1.7V VI = 60V, VO = 1.7V VRef Reference Voltage VDiff = 3V VDiff = 3.3V VDiff = 40V VRLine Line Regulation 3V ≤ VDiff ≤ 40V, VO = VRef 3.3V ≤ VDiff ≤ 40V, VO = VRef 40V ≤ VDiff ≤ 60V, IL = 60mA VRLoad Load Regulation VDiff = 3V, IL = 10mA to 500mA VDiff = 3.3V, IL = 10mA to 500mA VDiff = 40V, IL = 10mA to 150mA VDiff = 40V, IL = 10mA to 100mA Delta IAdj / Load Adjustment Pin Current Change VDiff = 3V, IL = 10mA to 500mA VDiff = 3.3V, IL = 10mA to 500mA VDiff = 40V, IL = 10mA to 150mA VDiff = 40V, IL = 10mA to 100mA Delta IAdj / Line IOS θR Adjustment Pin Current Change 3V ≤ VDiff ≤ 40V 3.3V ≤ VDiff ≤ 40V Short Circuit Current Thermal Regulation VDiff = 60V VDiff = 4.25V VDiff = 40V, IL = 150mA, t = 20mS 1.2 1.2 1.2 -8.64 -18 -25 -15 -15 -15 -15 -5.0 -5.0 -5.0 -5.0 -5.0 -5.0 0.0 0.5 Conditions Notes Min Max 100 100 100 5.0 5.0 5.0 8.2 1.3 1.3 1.3 8.64 18 25 15 15 15 15 5.0 5.0 5.0 5.0 5.0 5.0 0.4 1.8 6.0 Unit µA µA µA mA mA mA mA V V V mV mV mV mV mV mV mV µA µA µA µA µA µA A A mV Subgroups 1 2, 3 1, 2, 3 1 2, 3 1, 2, 3 1 1 2, 3 1, 2, 3 1 2, 3 1 1 2, 3 1 2, 3 1 2, 3 1 2, 3 1 2, 3 1 1 1 5 www.national.com LM117HVQML AC Parameters The following conditions apply, unless otherwise specified. VDiff = (VI − VO), IL = 8mA, VOUT = 1.25V (Nominal) Symbol RR Parameter Ripple Rejection Conditions VI = +6.25V, ƒ = 120Hz, eI = 1VRMS, IL = 125mA, VO = VRef Notes (Note 6) Min 66 Max Unit dB Subgroups 4, 5, 6 LM117HVH, HVWG Delta Electrical Characteristics DC Delta Parameters The following conditions apply, unless otherwise specified. Deltas performed on QMLV devices at Group B, Subgroup 5, only. Symbol IAdj VRef VRLine Parameter Adjust Pin Current Reference Voltage Line Regulation Conditions VDiff = 3V VDiff = 40V VDiff = 3V VDiff = 40V 3V ≤ VDiff ≤ 40V, VO = VRef 40V ≤ VDiff ≤ 60V, IL = 60mA Notes Min -10 -10 -0.01 -0.01 -4.0 -6.0 Max 10 10 0.01 0.01 4.0 6.0 Unit µA µA V V mV mV Subgroups 1 1 1 1 1 1 LM117HVH, HVWG Post Radiation Electrical Characteristics DC Parameters The following conditions apply, unless otherwise specified. VDiff = (VI − VO), IL = 8mA, VOUT = 1.25V (Nominal) Symbol VRef VRLine VRLoad Parameter Reference Voltage Line Regulation Load Regulation VDiff = 3V VDiff = 40V 3V ≤ VDiff ≤ 40V, VO = VRef VDiff = 3V, IL = 10mA to 500mA Conditions Notes Min 1.2 1.2 -40 -27 Max 1.45 1.45 40 27 Unit V V mV mV Subgroups 1 1 1 1 AC Parameters The following conditions apply, unless otherwise specified. VDiff = (VI − VO), IL = 8mA, VOUT = 1.25V (Nominal) Symbol RR Parameter Ripple Rejection Conditions VI = +6.25V, ƒ = 120Hz, eI = 1VRMS, IL = 125mA, VO = VRef Notes Min 55 Max Unit dB Subgroups 4 www.national.com 6 LM117HVQML LM117HVK Electrical Characteristics DC Parameters The following conditions apply, unless otherwise specified. VDiff =(VI − VO), IL = 10mA, VOUT = 1.25V (Nominal) Symbol IAdj Parameter Adjustment Pin Current VDiff = 3V VDiff = 3.3V VDiff = 40V IQ Minimum Load Current VDiff = 3V, VO = 1.7V VDiff = 3.3V, VO = 1.7V VI = 40V, VO = 1.7V VI = 60V, VO = 1.7V VRef Reference Voltage VDiff = 3V VDiff = 3.3V VDiff = 40V VRLine Line Regulation 3V ≤ VDiff ≤ 40V, VO = VRef 3.3V ≤ VDiff ≤ 40V, VO = VRef 40V ≤ VDiff ≤ 60V, IL = 60mA VRLoad Load Regulation VDiff = 3V, IL = 10mA to 1.5A VDiff = 3.3V, IL = 10mA to 1.5A VDiff = 40V, IL = 10mA to 300mA VDiff = 40V, IL = 10mA to 195mA Delta IAdj / Load Adjustment Pin Current Change VDiff = 3V, IL = 10mA to 1.5A VDiff = 3.3V, IL = 10mA to 1.5A VDiff = 40V, IL = 10mA to 300mA VDiff = 40V, IL = 10mA to 195mA Delta IAdj / Line IOS θR Adjustment Pin Current Change 3V ≤ VDiff ≤ 40V 3.3V ≤ VDiff ≤ 40V Short Circuit Current Thermal Regulation VDiff = 60V VDiff = 3V VDiff = 40V, IL = 300mA, t = 20mS 0.25 1.2 1.2 1.2 -8.64 -18 -25 -15 -15 -15 -15 -5.0 -5.0 -5.0 -5.0 -5.0 -5.0 0.0 1.5 Conditions Notes Min Max 100 100 100 5.0 5.0 5.0 8.2 1.3 1.3 1.3 8.64 18 25 15 15 15 15 5.0 5.0 5.0 5.0 5.0 5.0 0.4 3.5 10.5 Unit µA µA µA mA mA mA mA V V V mV mV mV mV mV mV mV µA µA µA µA µA µA A A mV Subgroups 1 2, 3 1, 2, 3 1 2, 3 1, 2, 3 1 1 2, 3 1, 2, 3 1 2, 3 1 1 2, 3 1 2, 3 1 2, 3 1 2, 3 1 2, 3 1 1 1 7 www.national.com LM117HVQML AC Parameters The following conditions apply, unless otherwise specified. VDiff = (VI − VO), IL = 10mA. Symbol RR Parameter Ripple Rejection Conditions VI = +6.25V, ƒ = 120Hz, eI = 1VRMS, IL = 0.5A, VO = VRef Notes (Note 6) Min 66 Max Unit dB Subgroups 4, 5, 6 Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. Note 2: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax (maximum junction temperature), θJA (package junction to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PDmax = (TJmax - TA) / θJA or the number given in the Absolute Maximum Ratings, whichever is lower. "Although power dissipation is internally limited, these specifications are applicable for power dissipations of 2W for the TO39 package and 20W for the TO3 package." Note 3: Human body model, 1.5 kΩ in series with 100 pF. Note 4: For the Ceramic SOIC device to function properly, the “Output” and “Output/Sense” pins must be connected on the users printed circuit board. Note 5: The package material for these devices allows much improved heat transfer over our standard ceramic packages. In order to take full advantage of this improved heat transfer, heat sinking must be provided between the package base (directly beneath the die), and either metal traces on, or thermal vias through, the printed circuit board. Without this additional heat sinking, device power dissipation must be calculated using θJA, rather than θJC, thermal resistance. It must not be assumed that the device leads will provide substantial heat transfer out the package, since the thermal resistance of the lead frame material is very poor, relative to the material of the package base. The stated θJC thermal resistance is for the package material only, and does not account for the additional thermal resistance between the package base and the printed circuit board. The user must determine the value of the additional thermal resistance and must combine this with the stated value for the package, to calculate the total allowed power dissipation for the device. Note 6: Tested @ 25°C; guaranteed, but not tested @ 125°C & −55°C Note 7: Pre and post irradiation limits are identical to those listed under AC and DC electrical characteristics, except as listed in the “LM117HVH, HVWG Post Radiation Electrical Characteristics” tables . These parts may be dose rate sensitive in a space environment and demonstrate enhanced low dose rate effect. Radiation end point limits for the noted parameters are guaranteed only for the conditions as specified in Mil-Std-883, Method 1019, Condition A. Note 8: Pre and post irradiation limits are identical to those listed under AC and DC electrical characteristics, except as listed in the “LM117HVH, HVWG Post Radiation Electrical Characteristics” tables. These parts pass all post irradiation limits under low dose rate testing at 10 mrad(Si)/s. Low dose rate qualification is performed on a wafer-by-wafer basis, per test method 1019 condition E of MIL-STD-883. www.national.com 8 LM117HVQML Typical Performance Characteristics Load Regulation Output capacitor = 0 μF unless otherwise noted. Current Limit 20143832 20143833 Adjustment Current Dropout Voltage 20143834 20143835 Temperature Stability Minimum Operating Current 20143836 20143837 9 www.national.com LM117HVQML Ripple Rejection Ripple Rejection 20143838 20143839 Ripple Rejection Output Impedance 20143840 20143841 Line Transient Response Load Transient Response 20143842 20143843 www.national.com 10 LM117HVQML Typical Radiation Characteristics Reference Voltage (Note 9) Load Regulation 20143848 20143849 Line Regulation Ripple Rejection 20143850 20143851 Note 9: Irradiation conditions: VI = 60V; low dose rate = 10 mrad(Si)/s 11 www.national.com LM117HVQML Application Hints In operation, the LM117HV develops a nominal 1.25V reference voltage, VREF, between the output and adjustment terminal. The reference voltage is impressed across program resistor R1 and, since the voltage is constant, a constant current I1 then flows through the output set resistor R2, giving an output voltage of tance can cause excessive ringing. This occurs with values between 500 pF and 5000 pF. A 1 μF solid tantalum (or 25 μF aluminum electrolytic) on the output swamps this effect and insures stability. Any increase of load capacitance larger than 10 μF will merely improve the loop stability and output impedance. LOAD REGULATION The LM117HV is capable of providing extremely good load regulation but a few precautions are needed to obtain maximum performance. The current set resistor connected between the adjustment terminal and the output terminal (usually 240Ω) should be tied directly to the output of the regulator rather than near the load. This eliminates line drops from appearing effectively in series with the reference and degrading regulation. For example, a 15V regulator with 0.05Ω resistance between the regulator and load will have a load regulation due to line resistance of 0.05 Ω × IL. If the set resistor is connected near the load the effective line resistance will be 0.05Ω (1 + R2/R1) or in this case, 11.5 times worse. Figure 2 shows the effect of resistance between the regulator and 240Ω set resistor. 20143805 FIGURE 1. Since the 100 μA current from the adjustment terminal represents an error term, the LM117HV was designed to minimize IADJ and make it very constant with line and load changes. To do this, all quiescent operating current is returned to the output establishing a minimum load current requirement. If there is insufficient load on the output, the output will rise. EXTERNAL CAPACITORS An input bypass capacitor is recommended. A 0.1 μF disc or 1 μF solid tantalum on the input is suitable input bypassing for almost all applications. The device is more sensitive to the absence of input bypassing when adjustment or output capacitors are used but the above values will eliminate the possibility of problems. The adjustment terminal can be bypassed to ground on the LM117HV to improve ripple rejection. This bypass capacitor prevents ripple from being amplified as the output voltage is increased. With a 10 μF bypass capacitor 80 dB ripple rejection is obtainable at any output level. Increases over 10 μF do not appreciably improve the ripple rejection at frequencies above 120 Hz. If the bypass capacitor is used, it is sometimes necessary to include protection diodes to prevent the capacitor from discharging through internal low current paths and damaging the device. In general, the best type of capacitors to use are solid tantalum. Solid tantalum capacitors have low impedance even at high frequencies. Depending upon capacitor construction, it takes about 25 μF in aluminum electrolytic to equal 1 μF solid tantalum at high frequencies. Ceramic capacitors are also good at high frequencies; but some types have a large decrease in capacitance at frequencies around 0.5 MHz. For this reason, 0.01 μF disc may seem to work better than a 0.1 μF disc as a bypass. Although the LM117HV is stable with no output capacitors, like any feedback circuit, certain values of external capaciwww.national.com 12 20143806 FIGURE 2. Regulator with Line Resistance in Output Lead With the TO-3 package, it is easy to minimize the resistance from the case to the set resistor, by using two separate leads to the case. However, with the TO-5 package, care should be taken to minimize the wire length of the output lead. The ground of R2 can be returned near the ground of the load to provide remote ground sensing and improve load regulation. PROTECTION DIODES When external capacitors are used with any IC regulator it is sometimes necessary to add protection diodes to prevent the capacitors from discharging through low current points into the regulator. Most 10 μF capacitors have low enough internal series resistance to deliver 20A spikes when shorted. Although the surge is short, there is enough energy to damage parts of the IC. When an output capacitor is connected to a regulator and the input is shorted, the output capacitor will discharge into the output of the regulator. The discharge current depends on the value of the capacitor, the output voltage of the regulator, and the rate of decrease of VIN. In the LM117HV, this discharge path is through a large junction that is able to sustain 15A surge with no problem. This is not true of other types of positive regulators. For output capacitors of 25 μF or less, there is no need to use diodes. The bypass capacitor on the adjustment terminal can discharge through a low current junction. Discharge occurs when LM117HVQML either the input or output is shorted. Internal to the LM117HV is a 50Ω resistor which limits the peak discharge current. No protection is needed for output voltages of 25V or less and 10 μF capacitance. Figure 3 shows an LM117HV with protection diodes included for use with outputs greater than 25V and high values of output capacitance. CURRENT LIMIT Internal current limit will be activated whenever the output current exceeds the limit indicated in the Typical Performance Characteristics. However, if during a short circuit condition the regulator's differential voltage exceeds the Absolute Maximum Rating of 60V (e.g. VIN ≥ 60V, VOUT = 0V), internal junctions in the regulator may break down and the device may be damaged or fail. Failure modes range from an apparent open or short from input to output of the regulator, to a destroyed package (most common with the TO-220 package). To protect the regulator, the user is advised to be aware of voltages that may be applied to the regulator during fault conditions, and to avoid violating the Absolute Maximum Ratings. Note: D1 protects against C1 D2 protects against C2 20143807 FIGURE 3. Regulator with Protection Diodes 13 www.national.com LM117HVQML Typical Applications 1.2V-45V Adjustable Regulator 20143801 Full output current not available at high input-output voltages †Optional—improves transient response. Output capacitors in the range of 1 μF to 1000 μF of aluminum or tantalum electrolytic are commonly used to provide improved output impedance and rejection of transients. *Needed if device is more than 6 inches from filter capacitors. Digitally Selected Outputs 5V Logic Regulator with Electronic Shutdown* *Min. output ≈ 1.2V 20143803 20143802 *Sets maximum VOUT Slow Turn-On 15V Regulator Adjustable Regulator with Improved Ripple Rejection 20143809 20143810 †Solid tantalum *Discharges C1 if output is shorted to ground www.national.com 14 LM117HVQML High Stability 10V Regulator High Current Adjustable Regulator 20143811 20143812 †Solid tantalum *Minimum load current = 30 mA ‡Optional—improves ripple rejection 0 to 30V Regulator Power Follower 20143813 Full output current not available at high input-output voltages 20143814 15 www.national.com LM117HVQML 5A Constant Voltage/Constant Current Regulator 20143815 †Solid tantalum *Lights in constant current mode 1A Current Regulator 1.2V–20V Regulator with Minimum Program Current 20143816 *Minimum load current ≈ 4 mA 20143817 www.national.com 16 LM117HVQML High Gain Amplifier Low Cost 3A Switching Regulator 20143819 20143818 †Solid tantalum *Core—Arnold A-254168-2 60 turns 4A Switching Regulator with Overload Protection 20143820 †Solid tantalum *Core—Arnold A-254168-2 60 turns Precision Current Limiter * 0.8Ω ≤ R1 ≤ 120Ω 20143821 17 www.national.com LM117HVQML Tracking Preregulator 20143822 Adjustable Multiple On-Card Regulators with Single Control* 20143823 *All outputs within ±100 mV †Minimum load—10 mA AC Voltage Regulator 12V Battery Charger 20143825 20143824 Use of RS allows low charging rates with fully charged battery. **The 1000 μF is recommended to filter out input transients www.national.com 18 LM117HVQML 50 mA Constant Current Battery Charger 20143826 Adjustable 4A Regulator Current Limited 6V Charger 20143828 *Sets peak current (0.6A for 1Ω) **The 1000 μF is recommended to filter out input transients 20143827 19 www.national.com LM117HVQML Revision History Date Released Revision 03/14/06 A Section New Release, Corporate format Originator L. Lytle Changes 2 MDS datasheets converted into one Corporate datasheet format. Corrected IL from 60mA to 8mA for RLine. Separated Delta IAdj / Line from Delta IAdj / Load for both the H & K devices. Removed drift from MNLM117HV-H electrical characteristics since not performed on 883 product. MNLM117HV-K Rev 0C1 & MNLM117HV-H Rev 2A1 will be archived. 07/06/07 B Features, Ordering Information, Connection Diagram, Absolute Maximum Ratings, Electrical's, Notes and Physical Dimensions Features, Ordering Information, Electrical's, Notes and Typical Radiation Characteristics, Physical Dimensions Drawing Larry McGee Added Radiation information and WG information to data sheet. Revision A to be Archived. Larry McGee Added ELDRS NSID information, HVH & HVWG Delta and Post Radiation Table, Typical Radiation Characteristics Plots, Note 8, 9 and WG Market Drawing. Revision B to be Archived. 02/13/08 C www.national.com 20 LM117HVQML Physical Dimensions inches (millimeters) unless otherwise noted T0-39 Metal Can Package (H) NS Package Number H03A T0-3 Metal Can Package (K) NS Package Number K02C 21 www.national.com LM117HVQML Ceramic SOIC NS Package Number WG16A www.national.com 22 LM117HVQML 23 www.national.com LM117HVQML 3-Terminal Adjustable Regulator Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers Audio Clock Conditioners Data Converters Displays Ethernet Interface LVDS Power Management Switching Regulators LDOs LED Lighting PowerWise Serial Digital Interface (SDI) Temperature Sensors Wireless (PLL/VCO) www.national.com/amplifiers www.national.com/audio www.national.com/timing www.national.com/adc www.national.com/displays www.national.com/ethernet www.national.com/interface www.national.com/lvds www.national.com/power www.national.com/switchers www.national.com/ldo www.national.com/led www.national.com/powerwise www.national.com/sdi www.national.com/tempsensors www.national.com/wireless WEBENCH Analog University App Notes Distributors Green Compliance Packaging Design Support www.national.com/webench www.national.com/AU www.national.com/appnotes www.national.com/contacts www.national.com/quality/green www.national.com/packaging www.national.com/quality www.national.com/refdesigns www.national.com/feedback Quality and Reliability Reference Designs Feedback THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. 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