UC1901 UC2901 UC3901 Isolated Feedback Generator FEATURES DESCRIPTION • An Amplitude-Modulation System for Transformer Coupling an Isolated Feedback Error Signal The UC1901 family is designed to solve many of the problems associated with closing a feedback control loop across a voltage isolation boundary. As a stable and reliable alternative to an optical coupler, these devices feature an amplitude modulation system which allows a loop error signal to be coupled with a small RF transformer or capacitor. • Low-Cost Alternative to Optical Couplers • Internal 1% Reference and Error Amplifier • Internal Carrier Oscillator Usable to 5MHz • Modulator Synchronizable to an External Clock • Loop Status Monitor The programmable, high-frequency oscillator within the UC1901 series permits the use of smaller, less expensive transformers which can readily be built to meet the isolation requirements of today's line-operated power systems. As an alternative to RF operation, the external clock input to these devices allows synchronization to a system clock or to the switching frequency of a SMPS. An additional feature is a status monitoring circuit which provides an activelow output when the sensed error voltage is within ±10% of the reference. The DRIVERA output, DRIVERB output, and STATUS output are disabled until the input supply has reached a sufficient level to allow proper operation of the device. Since these devices can also be used as a DC driver for optical couplers, the benefits of 4.5 to 40V supply operation, a 1% accurate reference, and a high gain general purpose amplifier offer advantages even though an AC system may not be desired. UC1901 SIMPLIFIED SCHEMATICNovember S µ µ µ UDG-98080 SLUS279A - November 1998 - Revised January 2010 UC1901 UC2901 UC3901 CONNECTION DIAGRAMS ABSOLUTE MAXIMUM RATINGS (Note 1) Input Supply Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . 40V Reference Output Current . . . . . . . . . . . . . . . . . . . . . . . –10mA Driver Output Currents . . . . . . . . . . . . . . . . . . . . . . . . . . –35mA Status Indicator Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V Status Indicator Current . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA Ext. Clock Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V Error Amplifier Inputs . . . . . . . . . . . . . . . . . . . . . –0.5V to +35V Power Dissipation at TA = 25°C . . . . . . . . . . . . . . . . . . 1000mW Power Dissipation at TC = 25°C . . . . . . . . . . . . . . . . . 2000mW Operating Junction Temperature . . . . . . . . . . –55°C to +150°C Storage Temperature . . . . . . . . . . . . . . . . . . . –65°C to +150°C Lead Temperature (Soldering, 10 seconds) . . . . . . . . . . 300°C DIL-14, SOIC-14 (TOP VIEW) J or N Package, D Package Note 1: Voltages are referenced to ground, Pin 7. Currents are positive into, negative out of the specified terminal. Note 2: Consult Packaging section of Databook for thermal limitations and considerations of package. PLCC-20, LCC-20 (TOP VIEW) Q, L Packages SOIC-16 Wide (TOP VIEW) DW Package TEMPERATURE AND PACKAGE SELECTION GUIDE UC1901 UC2901 UC3901 TEMPERATURE RANGE –55°C to +125°C –40°C to +85°C 0°C to +70°C AVAILABLE PACKAGES J, L D, DW, J, N, Q D, DW, J, N, Q 2 UC1901 UC2901 UC3901 ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for VIN = 10V, RT = 10kΩ, CT = 820pF, TA = TJ. PARAMETER TEST CONDITIONS Reference Section Output Voltage TJ = 25°C TMIN ≤ TJ ≤ TMAX Line Regulation VIN = 4.5 to 35V Load Regulation IOUT = 0 to 5mA Short Circuit Current TJ = 25°C Error Amplifier Section (To Compensation Terminal) Input Offset Voltage VCM = 1.5V Input Bias Current VCM = 1.5V Input Offset Current VCM = 1.5V Small Signal Open Loop Gain CMRR VCM = 0.5 to 7.5V PSRR VIN = 5 to 25V Output Swing, ∆ VO Maximum Sink Current Maximum Source Current Gain Band Width Product Slew Rate Modulators/Drivers Section (From Compensation Terminal) Voltage Gain Output Swing Driver Sink Current Driver Source Current Gain Band Width Product Oscillator Section Initial Accuracy TJ = 25°C TMIN ≤ TJ ≤ TMAX Line Sensitivity VIN = 5 to 35V Maximum Frequency RT = 10k, CT = 10pF Ext. Clock Low Threshold Pin 1 (CT) = VIN Ext. Clock High Threshold Pin 1 (CT) = VIN Status Indicator Section Input Voltage Window @ E/A Inputs, VCM = 1.5V Saturation Voltage E/A ∆ Input = 0V, ISINK = 1.6mA Max. Output Current Pin 13 = 3V, E/A ∆ Input = 0.0V Leakage Current Pin 13 = 40V, E/A ∆Input = 0.2V Supply Current VIN = 35V UVLO Section Drivers Enabled Threshold At Input Supply VIN Status Output Enabled At Input Supply VIN Threshold Change in Reference Output When VIN Reaches UVLO Threshold 3 UC1901/UC2901 MIN TYP MAX MIN 1.485 1.470 1.47 1.455 1.5 1.5 2 4 –35 1.515 1.530 10 10 –55 1 –1 0.1 60 80 100 0.7 150 –3 1 0.3 4 –3 1 11 ±1.6 500 –15 12 ±2.8 700 –35 25 13 140 130 150 160 170 .35 40 60 80 0.4 90 –2 .15 5 1.5 1.5 2 4 –35 1.53 1.545 15 15 –55 1 –1 0.1 60 80 100 0.7 150 –3 1 0.3 8 –6 2 mV µA µA dB dB dB V µA mA MHz V/µS 10 ±1.6 500 –15 12 ±2.8 700 –35 25 14 dB V µA mA MHz 130 120 150 170 180 .60 kHz kHz %/V MHz V V 40 60 80 0.4 90 –2 0.5 UC3901 UNITS TYP MAX .15 5 0.5 1.6 ±135 ±150 8 15 .05 5 ±165 0.45 1.6 ±170 0.45 V mV mV mV ±130 ±150 8 1 8 15 .05 5 5 10 mV V mA µA mA 3.9 3.9 4.5 4.5 3.9 3.9 4.5 4.5 V V –2 –30 –2 –30 mV UC1901 UC2901 UC3901 µ µ Note: Transformer Data: N1 = N2 = 20TAWG 26 Core = Ferroxcube 3E2A Ferrite, 0.5" O.D. toroid Carrier Frequency = 1MHz Figure 1. Transformer Coupled Open Loop Transfer Function Figure 2. Oscillator Frequency Figure 3. Typical Driver Output Swing vs Temperature APPLICATION INFORMATION The error amplifier compensation terminal, Pin 12, is intended as a source of feedback to the amplifier's inverting input at Pin 11. For most applications, a series DC blocking capacitor should be part of the feedback network. The amplifier is internally compensated for unity feedback. With the internal oscillator the squarewave will have a fixed 50% duty cycle. If the internal oscillator is disabled by connecting Pin 1, CR, to VIN then the frequency and duty cycle of the output will be determined by the input clock waveform at Pin 2. If the oscillator remains disabled and there is not clock input at Pin 2, there will be a linear 12dB of signal gain to one or the other of the driver outputs depending on the DC state of Pin 2. The waveform at the driver outputs is a squarewave with an amplitude that is proportional to the error amplifier input signal. There is a fixed 12dB of gain from the error amplifier compensation pin to the modulator driver outputs. The frequency of the output waveform is controlled by either the internal oscillator or an external clock signal. The driver outputs are emitter followers which will source a minimum of 15mA of current. The sink current, internally limited at 700µA, can be increased by adding resistors to ground at the driver outputs. 4 UC1901 UC2901 UC3901 APPLICATION INFORMATION (continued) Figure 4. R.F. Transformer Coupled Feedback Figure 5. Feedback Coupled at Switching Frequency 5 UC1901 UC2901 UC3901 6 PACKAGE OPTION ADDENDUM www.ti.com 5-Dec-2011 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/ Ball Finish MSL Peak Temp (3) (Requires Login) 5962-89441012A ACTIVE LCCC FK 20 1 TBD Call TI Call TI 5962-8944101CA ACTIVE CDIP J 14 1 TBD Call TI Call TI 5962-8944101VCA ACTIVE CDIP J 14 1 TBD A42 N / A for Pkg Type UC1901J ACTIVE CDIP J 14 1 TBD A42 N / A for Pkg Type UC1901J883B ACTIVE CDIP J 14 1 TBD A42 N / A for Pkg Type UC1901L ACTIVE LCCC FK 20 1 TBD POST-PLATE N / A for Pkg Type UC1901L883B ACTIVE LCCC FK 20 1 TBD POST-PLATE N / A for Pkg Type UC2901D ACTIVE SOIC D 14 50 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UC2901DG4 ACTIVE SOIC D 14 50 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UC2901DTR ACTIVE SOIC D 14 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UC2901DTR/80209 OBSOLETE SOIC D 14 UC2901DTR/80209G4 OBSOLETE SOIC D 14 UC2901DTRG4 ACTIVE SOIC D 14 TBD TBD 2500 Green (RoHS & no Sb/Br) Call TI Call TI Call TI Call TI CU NIPDAU Level-2-260C-1 YEAR UC2901J ACTIVE CDIP J 14 1 TBD UC2901N ACTIVE PDIP N 14 25 Green (RoHS & no Sb/Br) CU NIPDAU N / A for Pkg Type UC2901NG4 ACTIVE PDIP N 14 25 Green (RoHS & no Sb/Br) CU NIPDAU N / A for Pkg Type UC2901Q ACTIVE PLCC FN 20 46 Green (RoHS & no Sb/Br) CU SN Level-2-260C-1 YEAR UC2901QG3 ACTIVE PLCC FN 20 46 Green (RoHS & no Sb/Br) CU SN Level-2-260C-1 YEAR UC3901D ACTIVE SOIC D 14 50 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UC3901DG4 ACTIVE SOIC D 14 50 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UC3901DTR ACTIVE SOIC D 14 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Addendum-Page 1 A42 Samples N / A for Pkg Type PACKAGE OPTION ADDENDUM www.ti.com 5-Dec-2011 Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/ Ball Finish MSL Peak Temp (3) Samples (Requires Login) UC3901DTRG4 ACTIVE SOIC D 14 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UC3901DW ACTIVE SOIC DW 16 40 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UC3901DWG4 ACTIVE SOIC DW 16 40 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UC3901DWTR ACTIVE SOIC DW 16 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UC3901DWTRG4 ACTIVE SOIC DW 16 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UC3901N ACTIVE PDIP N 14 25 Green (RoHS & no Sb/Br) CU NIPDAU N / A for Pkg Type UC3901NG4 ACTIVE PDIP N 14 25 Green (RoHS & no Sb/Br) CU NIPDAU N / A for Pkg Type UC3901Q ACTIVE PLCC FN 20 46 Green (RoHS & no Sb/Br) CU SN Level-2-260C-1 YEAR UC3901QG3 ACTIVE PLCC FN 20 46 Green (RoHS & no Sb/Br) CU SN Level-2-260C-1 YEAR UC3901QTR ACTIVE PLCC FN 20 1000 Green (RoHS & no Sb/Br) CU SN Level-2-260C-1 YEAR UC3901QTRG3 ACTIVE PLCC FN 20 1000 Green (RoHS & no Sb/Br) CU SN Level-2-260C-1 YEAR (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Addendum-Page 2 PACKAGE OPTION ADDENDUM www.ti.com 5-Dec-2011 Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. 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OTHER QUALIFIED VERSIONS OF UC1901, UC1901-SP, UC2901, UC3901 : • Catalog: UC3901, UC1901 • Enhanced Product: UC2901-EP • Military: UC1901 • Space: UC1901-SP, UC1901-SP NOTE: Qualified Version Definitions: • Catalog - TI's standard catalog product • Enhanced Product - Supports Defense, Aerospace and Medical Applications • Military - QML certified for Military and Defense Applications • Space - Radiation tolerant, ceramic packaging and qualified for use in Space-based application Addendum-Page 3 PACKAGE MATERIALS INFORMATION www.ti.com 13-Jan-2010 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing UC2901DTR SOIC SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) D 14 2500 330.0 16.4 6.5 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 9.0 2.1 8.0 16.0 Q1 UC3901DTR SOIC D 14 2500 330.0 16.4 6.5 9.0 2.1 8.0 16.0 Q1 UC3901DWTR SOIC DW 16 2000 330.0 16.4 10.85 10.8 2.7 12.0 16.0 Q1 UC3901QTR PLCC FN 20 1000 330.0 16.4 10.3 10.3 4.9 12.0 16.0 Q1 Pack Materials-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 13-Jan-2010 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) UC2901DTR SOIC D 14 2500 346.0 346.0 33.0 UC3901DTR SOIC D 14 2500 346.0 346.0 33.0 UC3901DWTR SOIC DW 16 2000 346.0 346.0 33.0 UC3901QTR PLCC FN 20 1000 346.0 346.0 33.0 Pack Materials-Page 2 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. 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