UC1637-SP www.ti.com SLUS950 – FEBRUARY 2010 RAD-TOLERANT CLASS-V, SWITCHED MODE CONTROLLER FOR DC MOTOR DRIVE Check for Samples: UC1637-SP FEATURES 1 • • • • • • • • • (1) QML-V Qualified, SMD 5962-89957 Rad Tolerant: 30 kRad(Si) TID (1) – TID Dose Rate = 10 mRad/sec Single or Dual Supply Operation ±2.5-V to ±20-V Input Supply Range ±5% Initial Oscillator Accuracy; ±10% Over Temperature Pulse-by-Pulse Current Limiting Under-Voltage Lockout Shutdown Input with Temperature Compensated 2.5-V Threshold Uncommitted PWM Comparators for Design • Flexibility Dual 100-mA Source/Sink Output Drivers W PACKAGE (TOP VIEW) Radiation tolerance is a typical value based upon initial device qualification. Radiation Lot Acceptance Testing is available contact factory for details. DESCRIPTION The UC1637 is a pulse width modulator circuit intended to be used for a variety of PWM motor drive and amplifier applications requiring either uni-directional or bi-directional drive circuits. When used to replace conventional drivers, this circuit can increase efficiency and reduce component costs for many applications. All necessary circuitry is included to generate an analog error signal and modulate two bi-directional pulse train outputs in proportion to the error signal magnitude and polarity. This monolithic device contains a sawtooth oscillator, error amplifier, and two PWM comparators with ±100-mA output stages as standard features. Protection circuitry includes under-voltage lockout, pulse-by-pulse current limiting, and a shutdown port with a 2.5-V temperature compensated threshold. The UC1637 is characterized for operation over the full space temperature range of –55°C to 125°C. ORDERING INFORMATION TA PACKAGE ORDERABLE PART NUMBER TOP-SIDE MARKING –55°C to 125°C CFP-20 5962-8995701VSA UC1637W-SP 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2010, Texas Instruments Incorporated UC1637-SP SLUS950 – FEBRUARY 2010 www.ti.com FUNCTIONAL BLOCK DIAGRAM -AIN 13 12 20 16 18 15 17 14 19 ABSOLUTE MAXIMUM RATINGS (1) (2) over operating free-air temperature range (unless otherwise noted) VS IO Supply voltage Output current, source/sink (AOUT, BOUT) V 500 Steady-state 100 mA V Error amplifier output current (E/AOUTPUT) ±20 mA Oscillator charging current (ISET) –2 mA Junction temperature Storage temperature range Lead temperature (soldering, 10 seconds) 2 ±20 Peak ±VS Tstg (2) UNIT Analog inputs (+VTH, CT, -VTH, +BIN, -BIN, -AIN, +AIN, +C/L, -C/L, SHUTDOWN, +E/A, -E/A ) TJ (1) VALUE 150 °C –65 to 150 °C 300 °C Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. Currents are positive into, negative out of the specified terminal. Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): UC1637-SP UC1637-SP www.ti.com SLUS950 – FEBRUARY 2010 ELECTRICAL CHARACTERISTICS over operating free-air temperature range, VS = 15 V, –VS = –15 V, +VTH = 5 V, –VTH = –5 V, RT = 16.7 kΩ, CT = 1500 pF, TA = –55°C to 125°C = TJ (unless otherwise noted). PARAMETER TEST CONDITIONS MIN TYP MAX TJ = 25°C 9.4 10 10.6 TJ = –55°C to 125°C 9.2 UNIT OSCILLATOR Initial accuracy (1) VS = ±5 V to ±20 V, +VTH = 3 V, -VTH = –3 V Voltage stability Temperature stability Input bias current 5 Over operating range 7 % 0.5 +VTH CT = 6 V –10 0.1 –VTH CT = 0 V –10 –0.5 Input range (+VTH, –VTH) kHz 10.8 –VS+2 % 10 mA +VS-2 V ERROR AMPLIFIER Input offset voltage VCM = 0 V 1.5 ±5 mV Input bias current VCM = 0 V 0.5 5 mA Input offset current VCM = 0 V 0.1 ±1 mA Common mode range VS = ±2.5 V to ±20 V +VS V Open loop volage gain RL = 10k –VS+2 75 Slew rate Unity gain bandwidth 100 dB 15 V/ms 1 MHz CMRR Over common mode range 75 100 PSRR VS = ±2.5 V to ±20 V 75 110 dB Output sink current E/AOUTPUT = 0 V 20 50 mA Output source current E/AOUTPUT = 0 V 13 13.6 High level output voltage –11 Low level output voltage dB –5 mA V –14.8 –13 V mV PWM COMPARATORS Input offset voltage VCM = 0 V 20 50 Input bias current VCM = 0 V –10 2 10 mA Input Hysteresis VCM = 0 V 10 30 mV Common mode range VS = ±5 V to ±20 V –VS+1 +VS-2 V CURRENT LIMIT Input offset voltage VCM = 0 V, TJ = 25°C 190 VCM = 0 V, TJ = –55°C to 125°C 160 Input offset voltage T.C. 210 –10 VS = ±2.5 V to ±20 V mV 370 –0.2 Input bias current Common mode range 200 mV/°C –1.5 –VS mA +VS-3 V SHUTDOWN Shutdown threshold (2) –2.7 Hysteresis Input bias current SHUTDOWN = +VS to –VS –10 –2.5 –2.3 V 40 mV –0.5 mA UNDER-VOLTAGE LOCKOUT Start threshold (3) Hysteresis 75 4.15 5 V 250 500 mV 8.5 15 mA TOTAL STANDBY CURRENT Supply current (1) (2) (3) RT and CT referenced to ground. Parameter measured with respect to +VS (Pin 6). Parameter measured at +VS (Pin 6) with respect to -VS (Pin 5). Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): UC1637-SP 3 UC1637-SP SLUS950 – FEBRUARY 2010 www.ti.com ELECTRICAL CHARACTERISTICS (continued) over operating free-air temperature range, VS = 15 V, –VS = –15 V, +VTH = 5 V, –VTH = –5 V, RT = 16.7 kΩ, CT = 1500 pF, TA = –55°C to 125°C = TJ (unless otherwise noted). PARAMETER TEST CONDITIONS MIN TYP MAX ISINK = 20 mA –14.9 –13 ISINK = 100 mA –14.5 –13 UNIT OUTPUT SECTION Output low level Output high level ISOURCE = 20 mA 13 13.5 ISOURCE = 100 mA 12 13.5 V V Rise time CL = 1 nF, TJ = 25°C (4) 100 600 ns Fall time CL = 1 nF, TJ = 25°C (4) 100 300 ns (4) Parameters ensured by design and/or characterization, if not production tested. FUNCTIONAL DESCRIPTION The following is a description of each of the functional blocks shown in the Functional Block Diagram. Oscillator The oscillator consists of two comparators, a charging and discharging current source, a current source set terminal, ISET, and a flip-flop. The upper and lower threshold of the oscillator waveform is set externally by applying a voltage at pins +VTH and -VTH respectively. The +VTH terminal voltage is buffered internally and also applied to the ISET terminal to develop the capacitor charging current through RT. If RT is referenced to -VS as shown in Figure 1, both the threshold voltage and charging current will vary proportionally to the supply differential, and the oscillator frequency will remain constant. The triangle waveform oscillator's frequency and voltage amplitude are determined by the exernal components using the formulas given in Figure 1. 20 Figure 1. Oscillator Setup 4 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): UC1637-SP UC1637-SP www.ti.com SLUS950 – FEBRUARY 2010 PWM Comparators Two comparators are provided to perform pulse width modulation for each of the output drivers. Inputs are uncommitted to allow maximum flexibility. The pulse width of the outputs A and B is a function of the sign and amplitude of the error signal. A negative signal at -AIN and +BIN will lengthen the high state of output A and shorten the high state of output B. Likewise, a positive error signal reverses the procedure. Typically, the oscillator waveform is compared against the summation of the error signal and the level set on -BIN and +AIN. 9 13 12 Figure 2. Comparator Biasing MODULATION SCHEMES Case A Zero Deadtime (Equal voltage on -BIN and +AIN) In this configuration, maximum holding torque or stiffness and position accuracy is achieved. However, the power input into the motor is increased. Figure 3 (A) shows this configuration. Case B Small Deadtime (Voltage on -BIN > +AIN) A small differential voltage between -BIN and +AIN provides the necessary time delay to reduce the chances of momentary short circuit in the output stage during transitions, especially where power-amplifiers are used. Refer to Figure 3 (B). Case C Increased Deadtime and Deadband Mode (Voltage on -BIN > +AIN) With the reduction of stiffness and position accuracy, the power input into the motor around the null point of the servo loop can be reduced or eliminated by widening the window of the comparator circuit to a degree of acceptance. Where position accuracy and mechanical siffness is unimportant, deadband operation can be used. This is shown in Figure 3 (C). Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): UC1637-SP 5 UC1637-SP SLUS950 – FEBRUARY 2010 www.ti.com (+BIN, -AIN) (-BIN) (-BIN, +AIN) (+AIN) (-BIN) (-BIN) (-BIN) (+AIN) (+AIN) (+AIN) Figure 3. Modulation Schemes Showing (A) Zero Deadtime, (B) Deadtime and (C) Deadband Configurations Ouput Drivers Each output driver is capable of both sourcing and sinking 100 mA steady state and up to 500 mA on a pulsed basis for rapid switching of either POWERFET or bipolar transistors. Output levels are typically -VS+0.2 V at 50 mA low level and +VS-2 V at 50 mA high level. Error Amplifier The error amplifier consists of a high slew rate (15 V/ms) op-amp with a typical 1-MHz bandwidth and low output impedance. Depending on the ±VS supply voltage, the common mode range and the voltage output swing is within 2 V of the VS supply. Under-Voltage Lockout An under-voltage lockout circuit holds the outputs in the low state until a minimum of 4 V is reached. At this point, all internal circuitry is functional and the output drivers are enabled. If external circuitry requires a higher starting voltage, an over-riding voltage can be programmed through the shutdown terminal as shown in Figure 4. Shutdown Comparator The shutdown terminal may be used for implementing various shutdown and protection schemes. By pulling the terminal more than 2.5 V below VIN, the output drivers will be enabled. This can be realized using an open collector gate or NPN transistor biased to either ground or the negative supply. Since the threshold is temperature stabilized, the comparator can be used as an accurate low voltage lockout (Figure 4) and/or delayed start as in Figure 5. In the shutdown mode the outputs are held in the low state. 6 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): UC1637-SP UC1637-SP www.ti.com SLUS950 – FEBRUARY 2010 16 Figure 4. External Under-Voltage Lockout 16 Figure 5. Delayed Start-up Current Limit A latched current limit amplifier with an internal 200-mV offset is provided to allow pulse-by-pulse current limiting. Differential inputs will accept common mode signals from -VS to within 3 V of the +VS supply while providing excelent noise rejection. Figure 6 shows a typical current sense circuit. 14 15 Figure 6. Current Limit Sensing Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): UC1637-SP 7 UC1637-SP SLUS950 – FEBRUARY 2010 www.ti.com 16 20 ISET 18 15 17 14 19 12 13 Figure 7. Bi-Directional Motor Drive With Speed Control Power-Amplifier 16 20 ISET 18 15 17 14 19 12 13 Figure 8. Single Supply Position Servo Motor Drive 8 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): UC1637-SP PACKAGE OPTION ADDENDUM www.ti.com 28-Aug-2012 PACKAGING INFORMATION Orderable Device 5962-8995701VSA Status (1) Package Type Package Drawing ACTIVE CFP W Pins Package Qty 20 1 Eco Plan TBD (2) Lead/ Ball Finish Call TI MSL Peak Temp (3) Samples (Requires Login) N / A for Pkg Type (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. 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. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. 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