UC3637QG3

UC1637 UC2637 UC3637 Switched Mode Controller for DC Motor Drive FEATURES DESCRIPTION • Single or Dual Supply Operation • ±2.5V to ±20V Input Supply Range • ±5% Initial Oscillator Accuracy; ± 10% Over Temperature 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 bidirectional 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. • Pulse-by-Pulse Current Limiting • Under-Voltage Lockout This monolithic device contains a sawtooth oscillator, error amplifier, and two PWM comparators with ±100mA output stages as standard features. Protection circuitry includes under-voltage lockout, pulse-by-pulse current limiting, and a shutdown port with a 2.5V temperature compensated threshold. • Shutdown Input with Temperature Compensated 2.5V Threshold The UC1637 is characterized for operation over the full military temperature range of -55°C to +125°C, while the UC2637 and UC3637 are characterized for -25°C to +85°C and 0°C to +70°C, respectively. • Uncommitted PWM Comparators for Design Flexibility ABSOLUTE MAXIMUM RATINGS (Note 1) • Dual 100mA, Source/Sink Output Drivers BLOCK DIAGRAM 6/97 Supply Voltage (±Vs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20V Output Current, Source/Sink (Pins 4, 7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500mA Analog Inputs (Pins 1, 2, 3, 8, 9, 10, 11 12, 13, 14, 15, 16) . . . . . . . . . . . . . . . . . . . . . . . ±Vs Error Amplifier Output Current (Pin 17) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20mA Oscillator Charging Current (Pin 18). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -2mA Power Dissipation at TA = 25°C (Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000mW Power Dissipation at TC = 25°C (Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2000mW Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65°C to +150°C Lead Temperature (Soldering, 10 Seconds). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300°C Note 1: Currents are positive into, negative out of the specified terminal. Note 2: Consult Packaging Section of Databook for thermal limitations and considerations of package. UC1637 UC2637 UC3637 CONNECTION DIAGRAM PLCC-20, LCC-20 (TOP VIEW) Q, L Packages DIL-18 (TOP VIEW) J or N Package PACKAGE PIN FUNCTION FUNCTION PIN +VTH CT -VTH AOUT -VS N/C +VS BOUT +BIN -BIN -AIN +AIN +C/L -C/L SHUTDOWN N/C +E/A -E/A E/A OUTPUT ISET SOIC-20 (TOP VIEW) DW Package 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA = -55°C to +125°C for the UC1637; -25°C to +85°C for the UC2637; and 0°C to +70°C for the UC3637; +VS = +15V, -VS = - 15V, +VTH = 5V, -VTH = -5V, RT = 16.7kΩ, CT = 1500pF, TA=TJ. PARAMETER TEST CONDITIONS UC1637/UC2637 UC3637 UNITS MIN TYP MAX MIN TYP MAX 9.4 10 10.6 9 10 11 kHz 5 7 5 7 % Oscillator Initial Accuracy Voltage Stability TJ = 25°C (Note 6) VS = ±5V to ±20V, VPIN 1 = 3V, VPIN 3 = -3V Temperature Stability Over Operating Range (Note 3) +VTH Input Bias Current VPIN 2 = 6V -VTH Input Bias Current VPIN 2 = 0V +VTH, -VTH Input Range 0.5 2 -10 0.1 10 -10 -0.5 +VS-2 0.5 2 % -10 0.1 10 µA -10 -0.5 -VS+2 +VS-2 µA -VS+2 V Error Amplifier Input Offset Voltage VCM = 0V 1.5 5 1.5 10 mV Input Bias Current VCM = 0V 0.5 5 0.5 5 µA Input Offset Current 0.1 1 0.1 1 µA Common Mode Range VCM = 0V VS = ±2.5 to 20V Open Loop Voltage Gain RL = 10k -VS+2 75 +VS 100 -VS+2 80 +VS 100 V dB Slew Rate 15 15 V/µS Unity Gain Bandwidth 2 2 MHz CMRR PSRR Over Common Mode Range VS = ±2.5 to ±20V 2 75 100 75 100 dB 75 110 75 110 dB UC1637 UC2637 UC3637 ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA = -55°C to +125°C for the UC1637; -25°C to +85°C for the UC2637; and 0°C to +70°C for the UC3637: VS = +15V, -VS = - 15V, +VTH = 5V, -VTH = -5V, RT = 16.7kΩ, CT = 1500pF, TA=TJ. PARAMETERS TEST CONDITIONS UC1637/UC2637 MIN TYP MAX -50 -20 UC3637 MIN UNITS TYP MAX -50 -20 Error Amplifier (Continued) Output Sink Current VPIN 17 = 0V Output Source Current VPIN 17 = 0V High Level Output Voltage mA 5 11 5 11 mA 13 13.6 13 13.6 V Low Level Output Voltage -14.8 -13 -14.8 -13 V PWM Comparators Input Offset Voltage VCM = 0V 20 Input Bias Current VCM = 0V 2 Input Hysteresis VCM = 0V VS = ±5V to ±20V 10 Common Mode range -VS+1 20 10 2 mV 10 10 +VS-2 -VS+1 µA mV +VS-2 V Current Limit Input Offset Voltage VCM = 0V, TJ = 25°C 190 Input Offset Voltage T.C. Input Bias Current Common Mode Range 200 210 180 -0.2 -10 -1.5 VS = ±2.5V to ±20V -VS (Note 4) -2.3 -2.5 VPIN 14 = +VS to -VS -10 -0.5 200 220 -0.2 -10 mV mV/°C µA -1.5 +VS-3 -VS +VS-3 V -2.7 -2.3 -2.5 -2.7 V 40 mV -10 -0.5 µA Shutdown Shutdown Threshold Hysteresis Input Bias Current 40 Under-Voltage Lockout Start Threshold (Note 5) 4.15 Hysteresis 5.0 4.15 0.25 5.0 0.25 V mV Total Standby Current Supply Current 8.5 15 8.5 15 mA -14.9 -13 -14.9 -13 V -14.5 -13 -14.5 -13 Output Section Output Low Level ISINK = 20mA ISINK = 100mA Output High Level ISOURCE = 20mA 13 13.5 ISOURCE = 100mA 12 13.5 Rise Time (Note 3) CL = Inf, TJ = 25°C 100 600 100 600 ns Fall Time (Note 3) CL = Inf, TJ = 25°C 100 300 100 300 ns Note 3: Note 4: Note 5: Note 6: 13 13.5 12 13.5 V These parameters, although guaranteed over the recommended operating conditions, are not 100% tested in production. Parameter measured with respect to +VS (Pin 6). Parameter measured at +VS (Pin 6) with respect to -VS (Pin 5). RT and CT referenced to Ground. FUNCTIONAL DESCRIPTION Following is a description of each of the functional blocks shown in the Block Diagram. minal voltage is buffered internally and also applied to the lSET 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 oscillators frequency and voltage amplitude is determined by the external components using the formulas given in Figure 1. Oscillator The oscillator consists of two comparators, a charging and discharging current source, a current source set terminal, lSET 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 ter3 UC1637 UC2637 UC3637 Figure 1. Oscillator Setup 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 Pin 10 and 8 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 Pin 9 and 11. Figure 2. Comparator Biasing MODULATION SCHEMES Case A Zero Deadtime (Equal voltage on Pin 9 and Pin 11) In this configuration, maximum holding torque or stiffness and position accuracy is achieved. However, the power input into the motor is increased. Figure 3A shows this configuration. Output Drivers Each output driver is capable of both sourcing and sinking 100mA steady state and up to 500mA on a pulsed basis for rapid switching of either POWERFET or bipolar transistors. Output levels are typically -VS + 0.2V @50mA low level and +VS - 2.0V @50mA high level. Case B Small Deadtime (Voltage on Pin 9 > Pin 11) A small differential voltage between Pin 9 and 11 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 3B. Error Amplifier The error amplifier consists of a high slew rate (15V/µs) op-amp with a typical 1MHz bandwidth and low output impedance. Depending on the ±VS supply voltage, the common mode input range and the voltage output swing is within 2V of the VS supply. Case C Increased Deadtime and Deadband Mode (Voltage on Pin 9 > Pin 11) 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 stiffness is unimportant, deadband operation can be used. This is shown in Figure 3C. Under-Voltage Lockout An under-voltage lockout circuit holds the outputs in the low state until a minimum of 4V 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. 4 UC1637 UC2637 UC3637 Figure 3. Modulation Schemes Showing (A) Zero Deadtime (B) Deadtime and (C) Deadband Configurations Shutdown Comparator The shutdown terminal may be used for implementing various shutdown and protection schemes. By pulling the terminal more than 2.5V 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. Figure 5. Delayed Start-Up -VS to within 3V of the +VS supply while providing excellent noise rejection. Figure 6 shows a typical current sense circuit. Figure 4. External Under-Voltage Lockout Current Limit A latched current limit amplifier with an internal 200mV offset is provided to allow pulse-by-pulse current limiting. Differential inputs will accept common mode signals from Figure 6. Current Limit Sensing 5 UC1637 UC2637 UC3637 Figure 7. Bi-Directional Motor Drive with Speed Control Power-Amplifier Figure 8. Single Supply Position Servo Motor Drive UNITRODE CORPORATION 7 CONTINENTAL BLVD. • MERRIMACK, NH 03054 TEL. (603) 424-2410 • FAX (603) 424-3460 6 PACKAGE OPTION ADDENDUM www.ti.com 10-Jun-2022 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) 5962-89957012A ACTIVE LCCC FK 20 1 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 596289957012A UC1637L/ 883B 5962-8995701VA ACTIVE CDIP J 18 1 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 5962-8995701VA UC1637J/883B Samples UC1637J ACTIVE CDIP J 18 1 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 UC1637J Samples UC1637J883B ACTIVE CDIP J 18 1 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 5962-8995701VA UC1637J/883B Samples UC1637L ACTIVE LCCC FK 20 1 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 UC1637L Samples UC1637L883B ACTIVE LCCC FK 20 1 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 596289957012A UC1637L/ 883B UC2637DW ACTIVE SOIC DW 20 25 RoHS & Green NIPDAU Level-2-260C-1 YEAR -25 to 85 UC2637DW Samples UC2637DWG4 ACTIVE SOIC DW 20 25 RoHS & Green NIPDAU Level-2-260C-1 YEAR -25 to 85 UC2637DW Samples UC2637DWTR ACTIVE SOIC DW 20 2000 RoHS & Green NIPDAU Level-2-260C-1 YEAR -25 to 85 UC2637DW Samples UC2637J ACTIVE CDIP J 18 1 Non-RoHS & Green SNPB N / A for Pkg Type 0 to 0 UC2637J Samples UC2637N ACTIVE PDIP N 18 20 RoHS & Green NIPDAU N / A for Pkg Type -25 to 85 UC2637N Samples UC2637NG4 ACTIVE PDIP N 18 20 RoHS & Green NIPDAU N / A for Pkg Type -25 to 85 UC2637N Samples UC3637DW ACTIVE SOIC DW 20 25 RoHS & Green NIPDAU Level-2-260C-1 YEAR 0 to 70 UC3637DW Samples UC3637DWTR ACTIVE SOIC DW 20 2000 RoHS & Green NIPDAU Level-2-260C-1 YEAR 0 to 70 UC3637DW Samples UC3637J ACTIVE CDIP J 18 1 Non-RoHS & Green SNPB N / A for Pkg Type 0 to 70 UC3637J Samples UC3637N ACTIVE PDIP N 18 20 RoHS & Green NIPDAU N / A for Pkg Type 0 to 70 UC3637N Samples Addendum-Page 1 Samples Samples PACKAGE OPTION ADDENDUM www.ti.com 10-Jun-2022 Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan (2) Lead finish/ Ball material RoHS & Green NIPDAU MSL Peak Temp Op Temp (°C) Device Marking (3) Samples (4/5) (6) UC3637NG4 ACTIVE PDIP N 18 20 N / A for Pkg Type 0 to 70 UC3637N (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) 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