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UC1637 UC2637 UC3637
Switched Mode Controller for DC Motor Drive
FEATURES
* * * Single or Dual Supply Operation 2.5V to 20V Input Supply Range 5% Initial Oscillator Accuracy; 10% Over Temperature Pulse-by-Pulse Current Limiting Under-Voltage Lockout Shutdown Input with Temperature Compensated 2.5V Threshold Uncommitted PWM Comparators for Design Flexibility Dual 100mA, Source/Sink Output Drivers
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 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. 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. The UC1637 is characterized for operation over the full military temperature range of -55C to +125C, while the UC2637 and UC3637 are characterized for -25C to +85C and 0C to +70C, respectively.
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ABSOLUTE MAXIMUM RATINGS (Note 1)
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BLOCK DIAGRAM
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 = 25C (Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000mW Power Dissipation at TC = 25C (Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2000mW Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65C to +150C Lead Temperature (Soldering, 10 Seconds). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300C 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.
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CONNECTION DIAGRAM
DIL-18 (TOP VIEW) J or N Package PLCC-20, LCC-20 (TOP VIEW) Q, L Packages
UC1637 UC2637 UC3637
PACKAGE PIN FUNCTION FUNCTION PIN
SOIC-20 (TOP VIEW) DW Package
+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
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 = -55C to +125C for the
UC1637; -25C to +85C for the UC2637; and 0C to +70C for the UC3637; +VS = +15V, -VS = - 15V, +VTH = 5V, -VTH = -5V, RT = 16.7k, CT = 1500pF, TA=TJ. PARAMETER Oscillator Initial Accuracy Voltage Stability Temperature Stability +VTH Input Bias Current -VTH Input Bias Current +VTH, -VTH Input Range Error Amplifier Input Offset Voltage Input Bias Current Input Offset Current Common Mode Range Open Loop Voltage Gain Slew Rate Unity Gain Bandwidth CMRR PSRR Over Common Mode Range VS = 2.5 to 20V 75 75 VCM = 0V VCM = 0V VCM = 0V VS = 2.5 to 20V RL = 10k -VS+2 75 100 15 2 100 110 75 75 1.5 0.5 0.1 5 5 1 +VS -VS+2 80 100 15 2 100 110 1.5 0.5 0.1 10 5 1 +VS mV A A V dB V/S MHz dB dB TJ = 25C (Note 6) VS = 5V to 20V, VPIN 1 = 3V, VPIN 3 = -3V Over Operating Range (Note 3) VPIN 2 = 6V VPIN 2 = 0V -10 -10 +VS-2 9.4 10 5 0.5 0.1 -0.5 10.6 7 2 10 -10 -10 -VS+2 +VS-2 9 10 5 0.5 0.1 -0.5 -VS+2 11 7 2 10 kHz % % A A V TEST CONDITIONS UC1637/UC2637 MIN TYP MAX MIN UC3637 TYP MAX UNITS
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UC1637 UC2637 UC3637 ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA = -55C to +125C for the
UC1637; -25C to +85C for the UC2637; and 0C to +70C for the UC3637: VS = +15V, -VS = - 15V, +VTH = 5V, -VTH = -5V, RT = 16.7k, CT = 1500pF, TA=TJ. PARAMETERS Error Amplifier (Continued) Output Sink Current Output Source Current High Level Output Voltage Low Level Output Voltage PWM Comparators Input Offset Voltage Input Bias Current Input Hysteresis Common Mode range Current Limit Input Offset Voltage Input Offset Voltage T.C. Input Bias Current Common Mode Range Shutdown Shutdown Threshold Hysteresis Input Bias Current Under-Voltage Lockout Start Threshold Hysteresis Total Standby Current Supply Current Output Section Output Low Level Output High Level Rise Time Fall Time ISINK = 20mA ISINK = 100mA ISOURCE = 20mA ISOURCE = 100mA (Note 3) CL = Inf, TJ = 25C (Note 3) CL = Inf, TJ = 25C 13 12 -14.9 -14.5 13.5 13.5 100 100 600 300 -13 -13 13 12 -14.9 -14.5 13.5 13.5 100 100 600 300 ns ns -13 -13 V V 8.5 15 8.5 15 mA (Note 5) 4.15 0.25 5.0 4.15 0.25 5.0 V mV VPIN 14 = +VS to -VS -10 (Note 4) -2.3 -2.5 40 -0.5 -10 -2.7 -2.3 -2.5 40 -0.5 -2.7 V mV A VS = 2.5V to 20V -10 -VS VCM = 0V, TJ = 25C 190 200 -0.2 -1.5 +VS-3 -10 -VS 210 180 200 -0.2 -1.5 +VS-3 220 mV mV/C A V VCM = 0V VCM = 0V VCM = 0V VS = 5V to 20V -VS+1 20 2 10 +VS-2 -VS+1 10 20 2 10 +VS-2 10 mV A mV V VPIN 17 = 0V VPIN 17 = 0V 5 13 -50 11 13.6 -14.8 -13 -20 5 13 -50 11 13.6 -14.8 -13 -20 mA mA V V TEST CONDITIONS UC1637/UC2637 MIN TYP MAX MIN UC3637 TYP MAX UNITS
Note 3: Note 4: Note 5: Note 6:
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. 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 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.
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.
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. 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. 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.
Figure 2. Comparator Biasing 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. Error Amplifier The error amplifier consists of a high slew rate (15V/s) 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. 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.
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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
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PACKAGE OPTION ADDENDUM
www.ti.com
17-Nov-2005
PACKAGING INFORMATION
Orderable Device 5962-89957012A 5962-8995701VA UC1637J UC1637J883B UC1637L UC1637L883B UC2637DW UC2637DWG4 UC2637DWTR UC2637J UC2637N UC2637NG4 UC2637Q UC2637QTR UC3637DW UC3637DWTR UC3637DWTRG4 UC3637J UC3637N UC3637NG4 UC3637Q
(1)
Status (1) ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE
Package Type LCCC CDIP CDIP CDIP LCCC LCCC SOIC SOIC SOIC CDIP PDIP PDIP PLCC PLCC SOIC SOIC SOIC CDIP PDIP PDIP PLCC
Package Drawing FK J J J FK FK DW DW DW J N N FN FN DW DW DW J N N FN
Pins Package Eco Plan (2) Qty 20 18 18 18 20 20 20 20 20 18 18 18 20 20 20 20 20 18 18 18 20 1 1 1 1 1 1 25 25 TBD TBD TBD TBD TBD TBD Green (RoHS & no Sb/Br) Green (RoHS & no Sb/Br)
Lead/Ball Finish
MSL Peak Temp (3)
POST-PLATE Level-NC-NC-NC A42 SNPB A42 SNPB A42 SNPB Level-NC-NC-NC Level-NC-NC-NC Level-NC-NC-NC
POST-PLATE Level-NC-NC-NC POST-PLATE Level-NC-NC-NC CU NIPDAU CU NIPDAU CU NIPDAU A42 SNPB CU NIPDAU CU NIPDAU CU SN CU SN CU NIPDAU CU NIPDAU CU NIPDAU A42 SNPB CU NIPDAU CU NIPDAU CU SN Level-2-260C-1 YEAR Level-2-260C-1 YEAR Level-2-260C-1 YEAR Level-NC-NC-NC Level-NC-NC-NC Level-NC-NC-NC Level-2-260C-1 YEAR Level-2-260C-1 YEAR Level-2-260C-1 YEAR Level-2-260C-1 YEAR Level-2-260C-1 YEAR Level-NC-NC-NC Level-NC-NC-NC Level-NC-NC-NC Level-2-260C-1 YEAR
2000 Green (RoHS & no Sb/Br) 1 20 20 46 TBD Green (RoHS & no Sb/Br) Green (RoHS & no Sb/Br) Green (RoHS & no Sb/Br)
1000 Green (RoHS & no Sb/Br) 25 Green (RoHS & no Sb/Br)
2000 Green (RoHS & no Sb/Br) 2000 Green (RoHS & no Sb/Br) 1 20 20 46 TBD Green (RoHS & no Sb/Br) Green (RoHS & no Sb/Br) Green (RoHS & no Sb/Br)
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) 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. 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)
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
17-Nov-2005
(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. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 2
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