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| UC1543 UC1544 UC2543 UC2544 UC3543 UC3544 Power Supply Supervisory Circuit * FEATURES Includes Over-voltage, Under-voltage, And Current Sensing Circuits Internal 1% Accurate Reference Programmable Time Delays SCR "Crowbar" Drive Of 300mA Remote Activation Capability Optional Over-voltage Latch Uncommitted Comparator Inputs For Low Voltage Sensing (UC1544 Series Only) DESCRIPTION The monolithic integrated circuits contain all the functions necessary to monitor and control the output of a sophisticated power supply system. Over-voltage (O.V.) sensing with provision to trigger an external SCR "crowbar" shutdown; an undervoltage (U.V.) circuit which can be used to monitor either the output or to sample the input line voltage; and a third op amp/comparator usable for current sensing (C.L.) are all included in this IC, together with an independent, accurate reference generator. Both over- and under-voltage sensing circuits can be externally programmed for minimum time duration of fault before triggering. All functions contain open collector outputs which can be used independently or wire-or'ed together, and although the SCR trigger is directly connected only to the over-voltage sensing circuit, it may be optionally activated by any of the other outputs, or from an external signal. The O.V. circuit also includes an optional latch and external reset capability. The UC1544/2544/3544 devices have the added versatility of completely uncommitted inputs to the voltage sensing comparators so that levels less than 2.5V may be monitored by dividing down the internal reference voltage. The current sense circuit may be used with external compensation as a linear amplifier or as a highgain comparator. Although nominally set for zero input offset, a fixed threshold may be added with an external resistor. Instead of current limiting, this circuit may also be used as an additional voltage monitor. The reference generator circuit is internally trimmed to eliminate the need for external potentiometers and the entire circuit may be powered directly from either the output being monitored or from a separate bias voltage. * * * * * * BLOCK DIAGRAM Note: For each terminal, first number refers to 1543 series, second to 1544 series. * On 1543 series, this function is internally connected to VREF. 4/97 Powered by ICminer.com Electronic-Library Service CopyRight 2003 UC1543 UC1544 UC2543 UC2544 UC3543 UC3544 ABSOLUTE MAXIMUM RATINGS Input Supply Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V Sense Inputs, Voltage Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to VIN SCR Trigger Current (Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -600mA Indicator Output Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V Indicator Output Sink Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50mA Power Dissipation (Package Limitation). . . . . . . . . . . . . . . . . . . . . . . 1000mW Operating Temperature Range UC1543, UC1544 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55C to +125C UC2543, UC2544 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -25C to +85C UC3543, UC3544 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0C to +70C Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . -65C to +150C Note 1: At higher input voltages, a dissipation limiting resistor, RG, is required. Note 2: Currents are positive-into, negative-out of the specified terminal. Consult Packaging section of Databook for thermal limitations and considerations of package. CONNECTION DIAGRAMS DIL-16, SOIC-16 (TOP VIEW) J or N, DW Package UC 1543 UC 2543 UC 3543 DIL-18, SOIC-18 (TOP VIEW) J or N, DW Package UC 1544 UC 2544 UC 3544 PLCC-20, LCC-20 (TOP VIEW) Q or L Package PACKAGE PIN FUNCTION FUNCTION PIN N/C SCR Trigger Remote Activate Reset O.V. Indicate N/C O.V. Delay O.V. Input N/C N/C U.V. Input U.V. Delay U.V. Indicate C.L. INV. Input C.L. N.I. Input Offset/Comp C.L. Output Ground VREF VIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 PLCC-20, LCC-20 (TOP VIEW) Q or L Package PACKAGE PIN FUNCTION FUNCTION PIN N/C SCR Trigger Remote Activate Reset O.V. Indicate N/C O.V. Delay O.V. N.I. Input O.V. INV. Input U.V. N.I. Input U.V. INV. Input U.V. Delay U.V. Indicate C.L. INV. Input C.L. N.I. Input Offset/Comp C.L. Output Ground VREF VIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Powered by ICminer.com Electronic-Library Service CopyRight 2003 2 UC1543 UC1544 UC2543 UC2544 UC3543 UC3544 ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA = -55C to +125C for the UC1543 and UC1544; -25C to +85C for the UC2543 and UC2544; and 0C to +70C for the UC3543 and UC3544. Electrical tests are performed with VIN = 10V and 2k pull-up resistors on all indicator outputs. All electrical specifications for the UC1544, UC2544, and UC3544 devices are tested with the inverting over-voltage input and the non-inverting under-voltage input externally connected to the 2.5V reference. TA = TJ. PARAMETER Input Voltage Range Supply Current Reference Section Output Voltage Output Voltage Line Regulation Load Regulation Short Circuit Current Temperature Stability SCR Trigger Section Peak Output Current Peak Output Voltage Output Off Voltage Remote Activate Current Remote Activate Voltage Reset Current Reset Voltage Output Current Rise Time Prop. Delay from R/A Prop. Delay from O/V input Comparator Section Input Threshold (Input voltage rising on O.V. and falling on U.V.) Input Hysteresis Input Bias Current Delay Saturation Delay High Level Delay Charging Current Indicate Saturation Indicate Leakage Propagation Delay Current Limit Section Input Voltage Range Input Bias Current Input Offset Voltage CMRR AVOL Output Saturation Output Leakage Small Signal Bandwidth Propagation Delay TEST CONDITIONS TJ = 25C to TMAX TMIN to TMAX VIN = 40V, Output Open, TJ = 25C TMIN TJ TMAX TJ = 25C Over Temperature Range VIN = 5 to 30V IREF = 0 to 10mA VREF = 0 UC1543/UC1544 UC2543/UC2544 MIN TYP MAX 4.5 40 4.7 40 7 10 15 2.48 2.45 2.50 1 1 -20 50 -300 13 0 -0.4 2 -0.4 2 400 300 500 2.50 2.52 2.55 5 10 -40 UC3543/UC3544 MIN 4.5 4.7 TYP MAX 40 40 10 15 2.55 2.60 5 10 -40 UNITS 7 V V mA mA V V mV mV mA ppm/C mA V V mA V mA V mA/s ns ns V V mV A V V A V A ns ms V A mV mV dB dB V A MHz ns 2.45 2.40 2.50 1 1 -20 50 -300 13 0 -0.4 2 -0.4 2 400 300 500 2.50 -10 -12 VIN = 5V, RG = 0, VO = 0 VIN = 15V, IO = -100mA VIN = 40V R/A Pin = Gnd R/A Pin Open Reset = Gnd, R/A = Gnd Reset open, R/A = Gnd RL = 50, TJ = 25C, CD = 0 RL = 50, TJ = 25C, CD = 0 RL = 50, TJ = 25C, CD = 0 TJ = 25C Over Temperature Range -100 12 -600 0.1 -0.8 6 -0.8 6 -100 12 -600 0.1 -0.8 6 -0.8 6 2.45 2.40 2.55 2.60 2.40 2.35 2.60 2.65 Sense Input = 0V VO = 0 IL = 10mA VIND = 40V Input Over Drive = 200mV, TJ = 25C, CD = 0 Input Over Drive = 200mV, TJ = 25C, CD = 1F -200 25 -0.3 0.2 6 -250 0.2 .01 400 10 -1.0 0.5 7 -300 0.5 1.0 -200 25 -0.3 0.2 6 -250 0.2 .01 400 10 -1.0 0.5 7 -300 0.5 1.0 0 Offset Pin Open, VCM = 0 Offset Pin Open, VCM = 0 10k from Offset Pin to Gnd 0 VCM 12V, VIN = 15V Offset Pin Open, VCM = 0V, RL = 10k to 15k, VOUT = 1 to 6V IL = 10mA VIND = 40V AV = 0dB, TJ = 25C VOVERDRIVE = 100mV, TJ = 25C -0.3 0 100 70 80 0.2 .01 5 200 80 60 72 VIN -3V -1.0 10 120 0 -0.3 0 100 70 80 0.2 .01 5 200 80 60 72 VIN -3V -1.0 10 120 0.5 1.0 0.5 1.0 Powered by ICminer.com Electronic-Library Service CopyRight 2003 3 UC1543 UC1544 UC2543 UC2544 UC3543 UC3544 SCR Trigger Power Limiting Comparator Input Hysteresis Activation Delay vs Capacitor Value Current Limit Input Threshold Current Limit Amplifier Gain Current Limit Amplifier Frequency Response Note: RT is connected from Offset Pin to Gnd. Values of RT below 5.0k may cause Amplifier Cutoff at -55C. Powered by ICminer.com Electronic-Library Service CopyRight 2003 4 UC1543 UC1544 UC2543 UC2544 UC3543 UC3544 APPLICATIONS (Pin numbers given for UC1543 series devices) Typical Application The values for the external components are determined as follows: 1000 Current limit input threshold, VTH = R1 CS is determined by the current loop dynamics VTH VO R 2 + Peak current to load, IP RSC RSC R2 + R 3 VTH Short Circuit Current, ISC = RSC 2.5 (R4 + R5 + R6) Low output voltage limit, VO (Low) = R5 + R6 2.5 (R4 + R5 + R6) High output voltage limit, VO (High) = R6 Voltage sensing delay, tD = 10,000Cd VIN - 5 SCR trigger power limiting resistor, RG > 0.2 Sensing Multiple Supply Voltages Input Line Monitor Overcurrent Shutdown UNITRODE CORPORATION 7 CONTINENTAL BLVD. * MERRIMACK, NH 03054 TEL. (603) 424-2410 * FAX 603-424-3460 Powered by ICminer.com Electronic-Library Service CopyRight 2003 5 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE ("CRITICAL APPLICATIONS"). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER'S RISK. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI's publication of information regarding any third party's products or services does not constitute TI's approval, warranty or endorsement thereof. Copyright (c) 1999, Texas Instruments Incorporated Powered by ICminer.com Electronic-Library Service CopyRight 2003 |
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