LR645 High-Input Voltage SMPS, Start-up/Linear Regulator Features Description • Accepts inputs from 15 to 450V • Output currents: up to 3.0mA continuous, 30mA peak • Supply current typically 50µA • Line regulation typically 0.1mV/V • Output can be trimmed from 8.0 to 12V • Output current can be increased to 150mA with external FET LR645 is a high-input voltage, low-output current, linear regulator that is available in two versions. A 3-terminal, fixed-output voltage version is available in TO-92, TO220 and SOT-89 packages, as well as an adjustable voltage version available in an 8-lead SOIC package. Applications • Off-line SMPS startup circuits (pulse loads) • Low power off-line regulators • Regulators for noisy inputs The 3-terminal version of LR645 functions like any other low-voltage, 3-terminal regulator except it allows the use of much higher-input voltages. When used in a Switched-mode Power Supply (SMPS), start-up circuit, LR645 eliminates the need for large power resistors. In this application, current is drawn from the high voltage line only during start-up. Only leakage current flows after start-up, thereby reducing the continuous power dissipation to a few milliwatts. The adjustable-voltage version allows trimming of the output voltage from 8.0 to 12V. This version can also be connected to an external depletion mode metal–oxide– semiconductor field-effect transistor (MOSFET) for increased output current. When used in conjunction with depletion mode MOSFET DN2540N5, an output current of up to 150mA is achieved. WARNING The LR645 does NOT provide galvanic isolation. When operated from an AC line, potentially lethal voltages can be present on the IC. Adequate means of protecting the end user from such voltages must be provided by the circuit developer. 2015 Microchip Technology Inc. DS20005384A-page 1 LR645 Package Type TRIM NC GATE NC VOUT VIN VOUT GND NC +VIN GND TO-92 8-Lead SOIC GND GND VOUT GND VIN TO-243AA (SOT-89) VOUT +VIN GND TO-220 See Table 2-1 for pin information DS20005384A-page 2 2015 Microchip Technology Inc. LR645 1.0 ELECTRICAL CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS Input Voltage .................................................................................................................................................................................. 450V Output voltage............................................................................................................................................................................... 15.5V Operating and storage temperature ............................................................................................................................. -55°C to +150°C Note: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions, above those indicated in the operational listings of this specification, is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. 1.1 ELECTRICAL SPECIFICATIONS TABLE 1-1: Symbol VOUT ∆VOUT ELECTRICAL CHARACTERISTICS 1 Parameter Min Typ Max Output voltage 9.3 10 10.7 V No load Output voltage over temperature2 9.0 10 11.5 V TJ = - 40 to +125°C, No load - 40 200 mV VIN = 15 to 400V, No load VIN = 50V, IOUT = 0 to 3.0mA Line regulation Load regulation Units Conditions - 150 400 mV 15 - 450 V Input quiescent current - 50 150 µA No Load IOFF VIN off-state leakage current - 0.1 10 µA VAUX ≥ VOUT +1V applied to VOUT pin IAUX Input current to VOUT VIN Operating input voltage range IINQ - - 200 µA VAUX ≥ VOUT +1V applied to VOUT pin 50 60 - dB 120 Hz, No Load voltage2 - 25 - µV 0.01 to 100 KHz IPEAK Output peak current3 - 30 - mA COUT = 10 µF, VIN = 400V VAUX External voltage applied to VOUT - - 13.2 V ∆VOUT/∆VIN Ripple rejection ratio2 en Noise 8-lead, adjustable voltage version only VOUT ∆VOUT 1 2 3 8 - 12 V Load regulation at 8V trim2 - 200 400 mV VIN = 15V, IOUT = 0 to 1.0 mA Load regulation at 12V trim2 - 100 400 mV VIN = 50V, IOUT = 0 to 3.0 mA No load Test Conditions unless otherwise specified: TA = 25°C, VIN = 15V-450V, COUT = 0.01 µF Guaranteed by design Pulse test duration <1.0 msec, duty cycle <2% TABLE 1-2: 1 Output regulation trim range2 THERMAL CHARACTERISTICS1 Package θja Power Dissipation @TA=25°C 8-lead SOIC 101°C/W 0.31 0.74 TO-92 132°C/W TO-220 29°C/W 1.8 TO-243AA (SOT-89) 133°C/W 1.6 Mounted on FR5 board; 25mm x 25mm x 1.57mm. Significant PD increase possible on ceramic substrate. 2015 Microchip Technology Inc. DS20005384A-page 3 LR645 2.0 PIN DESCRIPTION The locations of the pins are listed in Package Type. TABLE 2-1: Function PIN DESCRIPTION Description VIN Regulator input. 8 - 450V. GND Ground return for all internal circuitry. This pin must be electrically connected to circuit common. GATE Output GATE driver for an external N-channel depletion. TRIM A voltage divider from VOUT to this pin adjusts the output voltage. VOUT Regulator output. NC No connection. DS20005384A-page 4 2015 Microchip Technology Inc. LR645 3.0 FUNCTIONAL DESCRIPTION 3.1 SMPS Start-Up Circuit through a diode to the VOUT pin of LR645 will start to increase. When the auxiliary voltage becomes larger than the output voltage LR645 turns OFF both its internal high voltage input line and output voltage, allowing the auxiliary voltage to power the VCC line of the PWM IC. After startup, LR645 doesn’t draw any input current from the high-voltage line other than the leakage current of the internal MOSFET switch, which is typically 0.1µA. One of the main applications for LR645 is a start-up circuit for off-line, switch-mode power supplies (SMPS), as shown in Figure 3-1. A minimum output capacitance of 10 nF is recommended for stability. The wide operating, input voltage range of LR645 allows the SMPS to operate and start-up from rectified AC, or a DC voltage of 15 to 450V, without adjustment. The 3-terminal version shown in Figure 3-1 has load regulation guaranteed from 0 to 3.0mA at a fixed nominal output voltage of 10V. Applications requiring higher output current and/or a different output voltage can use the 8 pin adjustable version. During start-up, the LR645 powers the VCC line of the Pulse-Width Modulation (PWM) IC with a nominal output voltage of 10V. The auxiliary voltage connected FIGURE 3-1: SMPS START-UP CIRCUIT + + 5.0V VAUX = 12V 15 - 450V VCC VIN LR6 CIN PWM IC COUT GND - 3.2 High-Current SMPS Start-Up Circuit breakdown voltage of the external MOSFET, but cannot exceed the 450V rating of LR645. The 8-lead version of LR645 has connections for an external depletion-mode MOSFET for higher-output current and external resistors for adjustable-output voltage. As shown in Figure 3-2, the output current is increased to 150mA by using the DN2540, a 400V depletion-mode MOSFET. The maximum operating input voltage will be limited by the drain-to-source, The output voltage can be adjusted from 8 to 12V with two external resistors: R1 and R2. The ratio of R2/R1 determines the output voltage. R2 is connected between the VOUT and TRIM pins; R1 is connected between TRIM and GND pins. Figure 3-3 is a curve showing output voltage versus resistor ratio R2/R1. The optimum range for R1 + R2 is 200KΩ to 300KΩ. This minimizes loading and optimizes accuracy of the output voltage. Figure 3-3 uses an R1 + R2 of 250KΩ. FIGURE 3-2: HIGH-CURRENT SMPS START-UP CIRCUIT + + 5.0V DN2540 – VAUX = 12V GATE 15V to 400V VCC VOUT LR645 CIN R2 TRIM GND COUT PWM IC R1 – Note: When used with the DN25, +VIN is not connected on the LR6. 2015 Microchip Technology Inc. DS20005384A-page 5 LR645 FIGURE 3-3: TYPICAL OUTPUT VOLTAGE VS RESISTOR RATIO Figure 3-4 shows the LR645 as a pre-regulator to a precision regulator for high precision regulation. Higher output current is also possible by using an external depletion-mode MOSFET DN2540N5 as shown in Figure 3-5. 12 Output Voltage (V) FIGURE 3-4: Max 875 ACSA LR6 10 AC Line 24V - 277V R1 + R2 = 250kΩ 3.4 8 2.5 3.0 3.5 Off Line Linear Regulator COUT 0.1μF Power Dissipation Considerations P DISS = V IN – V OUT I OUT + I MAXQuiescent = 400V – 10V 3.0mA + 150A = 1.23Watts Circuits that require low voltages to operate logic and analog circuits benefit from LR645. The conventional use of step-down transformers can be eliminated, thereby saving space and cost. Some examples of lowvoltage applications are: proximity controlled light switches, street lamp controls, and low-voltage power supplies for appliances such as washing machines, dishwashers, and refrigerators. The 1.23 watts is for continuous operation. This is within the dissipation capabilities of the TO-220 and SOT-89 packages. See Table 1-2 on Page 3 for deratings. For SMPS start-up applications, the output current is usually required only during start-up. This duration depends upon the auxiliary supply output capacitor and COUT, but is typically a few hundred milliseconds. All package types of the LR645 have been characterized for use with a COUT of at least 10µF, and an AC line of 277V. The wide operating-input voltage range of 15 to 450V, as well as the ripple rejection ratio of 50dB minimum, allows the use of a small, high-voltage input capacitor. The input AC line can be either full-wave or half-wave rectified. A minimum output capacitance of 0.01µF is recommended for output stability. FIGURE 3-5: CIN 1.0μF 5.000V ± 0.002V @ 0 to 3mA LR645 is a true linear regulator. Its power dissipation is therefore a function of input voltage and output load current. For example, if the LR645 provides a continuous load current of 3mA at 10V, while its input voltage is 400V, total dissipation in the LR645 will be: 4.0 Resistor Ratio (R2/R1) 3.3 CASCADING FOR PRECISION HIGH-CURRENT REGULATION DN2540N5 AC Line 24 - 277V GATE CIN LR645 VOUT COUT 5.0V REG 5.0V + 0 - 150mA - GND DS20005384A-page 6 2015 Microchip Technology Inc. LR645 FIGURE 3-6: BLOCK DIAGRAM VIN LR645 VOUT TRIM – + GATE GND 2015 Microchip Technology Inc. DS20005384A-page 7 LR645 4.0 PACKAGING INFORMATION 4.1 Package Marking Information Example 8-lead SOIC XXXXXXXX XX e3 YYWW NNN LR645LG e3 1508 343 Example 3-lead TO-220 XXXYYWW NNN 3-lead TO-92 XXXXXX XXXX e3 YWWNNN Legend: XX...X Y YY WW NNN e3 * DS20005384A-page 8 LR6508 343 Example LR645 N3 e3 508343 LR645N5 e3 1508343 XXXXXXXXX XXXXXXX e3 YYWWNNN Note: Example 3-lead TO-243AA * (SOT-89) Product Code or Customer-specific information Year code (last digit of calendar year) Year code (last 2 digits of calendar year) Week code (week of January 1 is week ‘01’) Alphanumeric traceability code Pb-free JEDEC® designator for Matte Tin (Sn) This package is Pb-free. The Pb-free JEDEC designator ( e3 ) can be found on the outer packaging for this package. In the event the full Microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for product code or customer-specific information. Package may or not include the corporate logo. 2015 Microchip Technology Inc. LR645 Note: For the most current package drawings, see the Microchip Packaging Specification at www.microchip.com/packaging. 2015 Microchip Technology Inc. DS20005384A-page 9 LR645 3-Lead TO-243AA (SOT-89) Package Outline (N8) D D1 C E H 1 2 E1 3 L b b1 A e e1 Side View Top View Note: For the most current package drawings, see the Microchip Packaging Specification at www.microchip.com/packaging. Symbol Dimensions (mm) A b b1 C D D1 E E1 MIN 1.40 0.44 0.36 0.35 4.40 1.62 2.29 2.00† NOM - - - - - - - - MAX 1.60 0.56 0.48 0.44 4.60 1.83 2.60 2.29 e 1.50 BSC e1 3.00 BSC H L 3.94 0.73† - - 4.25 1.20 JEDEC Registration TO-243, Variation AA, Issue C, July 1986. † This dimension differs from the JEDEC drawing Drawings not to scale. DS20005384A-page 10 2015 Microchip Technology Inc. LR645 3-Lead TO-220 Package Outline (N5) A E ΦP E2 Seating Plane A1 A Thermal Pad E Q H1 4 D2 D D1 Chamfer Optional 1 2 3 E1 L View B A2 c e Front View A Side View 1 View A - A 3 2 L1 b b2 View B Note: For the most current package drawings, see the Microchip Packaging Specification at www.microchip.com/packaging. Symbol Dimension (inches) A A1 A2 b b2 c D D1 D2 E E1 E2 MIN .140 .020 .080 .015 .045 .012† .560 .326† .474† .380 .270 0.20* NOM - - - .027 .057 - - - - - - - MAX .190 .055 .120† .040 .070 .024 .650 .361† .507 .420 .350 .030 e .100 BSC H1 L L1 Q ĭP .230 .500 .200* .100 .139 - - - - - .270 .580 .250 .135 .161 JEDEC Registration TO-220, Variation AB, Issue K, April 2002. 7KLVGLPHQVLRQLVQRWVSHFL¿HGLQWKH-('(&GUDZLQJ 7KLVGLPHQVLRQGLIIHUVIURPWKH-('(&GUDZLQJ Drawings not to scale. 2015 Microchip Technology Inc. DS20005384A-page 11 LR645 Note: For the most current package drawings, see the Microchip Packaging Specification at www.microchip.com/packaging. DS20005384A-page 12 2015 Microchip Technology Inc. LR645 APPENDIX A: REVISION HISTORY Revision A (April 2015) • Update file to new format 2015 Microchip Technology Inc. DS20005384A-page 13 LR645 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. PART NO. Device - XX X - Package Environmental Options Device: Package: LR645 X Media Type = High-Input, Voltage SMPS, Start-up/Linear Regulator LG N3 N5 N8 = = = = Environmental G = Lead (Pb)-free/ROHS-compliant package Media Type: (blank) = = = = DS20005384A-page 14 8-lead SOIC (adjustable voltage) TO-92 (fixed voltage) TO-220(fixed voltage) TO-243AA (SOT-89) (fixed voltage) Examples: a) LR645LG-G: b) LR645N3-G c) LR645N3-G-P003: d) LR645N3-G-P013: e) LR645N5-G f) LR645N8-G 8-lead SOIC package, 3300/reel. TO-92 package, 1000/bag TO-92 package, 2000/reel. TO-92 package, 2000/ammo pack. TO-220 package, 50/tube TO-243AA package, 2000/reel 3300/Reel for LG packages 1000/Bag for N3 packages 50/Tube for TO-220 packages 2000/Reel for TO-243AA packages P003 = 2000/Reel for N3 package P013 = 2000/Ammo Pack for N3 package 2015 Microchip Technology Inc. Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property. • Microchip is willing to work with the customer who is concerned about the integrity of their code. • Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as “unbreakable.” Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act. Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. 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Trademarks The Microchip name and logo, the Microchip logo, dsPIC, FlashFlex, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART, PIC32 logo, rfPIC, SST, SST Logo, SuperFlash and UNI/O are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. FilterLab, Hampshire, HI-TECH C, Linear Active Thermistor, MTP, SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. Silicon Storage Technology is a registered trademark of Microchip Technology Inc. in other countries. Analog-for-the-Digital Age, Application Maestro, BodyCom, chipKIT, chipKIT logo, CodeGuard, dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN, ECONOMONITOR, FanSense, HI-TIDE, In-Circuit Serial Programming, ICSP, Mindi, MiWi, MPASM, MPF, MPLAB Certified logo, MPLIB, MPLINK, mTouch, Omniscient Code Generation, PICC, PICC-18, PICDEM, PICDEM.net, PICkit, PICtail, REAL ICE, rfLAB, Select Mode, SQI, Serial Quad I/O, Total Endurance, TSHARC, UniWinDriver, WiperLock, ZENA and Z-Scale are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. GestIC and ULPP are registered trademarks of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in other countries. All other trademarks mentioned herein are property of their respective companies. © 2015, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. ISBN: 978-1-63277-244-2 QUALITYMANAGEMENTSYSTEM CERTIFIEDBYDNV == ISO/TS16949== 2015 Microchip Technology Inc. Microchip received ISO/TS-16949:2009 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona; Gresham, Oregon and design centers in California and India. The Company’s quality system processes and procedures are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping devices, Serial EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001:2000 certified. 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