UC1901L883B

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 9-Dec-2023 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan (2) Lead finish/ Ball material MSL Peak Temp Op Temp (°C) Device Marking (3) Samples (4/5) (6) 5962-89441012A ACTIVE LCCC FK 20 55 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 596289441012A UC1901L/ 883B 5962-8944101CA ACTIVE CDIP J 14 25 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 5962-8944101CA UC1901J/883B 5962-8944101VCA ACTIVE CDIP J 14 25 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 5962-8944101VC A UC1901JQMLV UC1901J ACTIVE CDIP J 14 25 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 UC1901J Samples UC1901J883B ACTIVE CDIP J 14 25 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 5962-8944101CA UC1901J/883B Samples UC1901L ACTIVE LCCC FK 20 55 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 UC1901L Samples UC1901L883B ACTIVE LCCC FK 20 55 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 596289441012A UC1901L/ 883B UC2901D ACTIVE SOIC D 14 50 RoHS & Green NIPDAU Level-2-260C-1 YEAR -40 to 85 UC2901D Samples UC2901DTR ACTIVE SOIC D 14 2500 RoHS & Green NIPDAU Level-2-260C-1 YEAR -40 to 85 UC2901D Samples UC2901J ACTIVE CDIP J 14 25 Non-RoHS & Green SNPB N / A for Pkg Type -40 to 85 UC2901J Samples UC2901N ACTIVE PDIP N 14 25 RoHS & Green NIPDAU N / A for Pkg Type -40 to 85 UC2901N Samples UC3901D ACTIVE SOIC D 14 50 RoHS & Green NIPDAU Level-2-260C-1 YEAR 0 to 70 UC3901D Samples UC3901DTR LIFEBUY SOIC D 14 2500 RoHS & Green NIPDAU Level-2-260C-1 YEAR 0 to 70 UC3901D UC3901DW LIFEBUY SOIC DW 16 40 RoHS & Green NIPDAU Level-2-260C-1 YEAR 0 to 70 UC3901DW UC3901N LIFEBUY PDIP N 14 25 RoHS & Green NIPDAU N / A for Pkg Type 0 to 70 UC3901N (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. Addendum-Page 1 Samples Samples Samples Samples PACKAGE OPTION ADDENDUM www.ti.com 9-Dec-2023 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) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of