Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - motor controllers Pre-driver - half bridge (4) Parallel SOIC 20

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

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 -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.

Switched Mode Controller for DC Motor Drive

UC1637

UC2637

UC3637

BLOCK DIAGRAM

• 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

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) . . . . . . . . . . . . . . . . . . . . . . .

Error Amplifier Output Current (Pin 17) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

20mA

Oscillator Charging Current (Pin 18). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -2mA

Power Dissipation at T

= 25°C (Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000mW

Power Dissipation at T

= 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.

FEATURES

ABSOLUTE MAXIMUM RATINGS (Note 1)

DESCRIPTION

6/97

Summary of content (12 pages)

PAGE 1
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.
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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
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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.
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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.
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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.
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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.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 10-Jun-2014 (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line.
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PACKAGE MATERIALS INFORMATION www.ti.com 15-Jan-2014 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant UC2637DWTR SOIC DW 20 2000 330.0 24.4 10.8 13.3 2.7 12.0 24.0 Q1 UC3637DWTR SOIC DW 20 2000 330.0 24.4 10.8 13.3 2.7 12.0 24.
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PACKAGE MATERIALS INFORMATION www.ti.com 15-Jan-2014 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) UC2637DWTR SOIC DW 20 2000 367.0 367.0 45.0 UC3637DWTR SOIC DW 20 2000 367.0 367.0 45.
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