David M Baldwin

US Patent:

6373343, Apr 16, 2002

Filed:

Aug 28, 2000

Appl. No.:

09/649367

Inventors:

David J. Baldwin - Allen TX
Christopher M. Cooper - Denison TX
Joseph A. Devore - Richardson TX
Ross E. Teggatz - McKinney TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H03B 524

US Classification:

331 76, 331 60, 331 74, 331111, 331143

Abstract:

An integrated circuit ( ) is disclosed comprising a fundamental frequency oscillator comprising a reference node ( ) whose voltage varies between a high threshold and a low threshold. The fundamental frequency oscillator is operable to generate a first output at the fundamental frequency on a first output node ( ). The integrated circuit ( ) also comprises a circuit (C ) coupled to the reference node. The circuit (C ) is operable to sense the voltage at the reference node ( ), to determine when the voltage exceeds an intermediate threshold between the high threshold and the low threshold, and to generate a second output in response to the determination. The integrated circuit ( ) also comprises logic ( ) coupled to the circuit (C ) and load circuitry ( ) coupled to the logic ( ). The logic ( ) is operable to generate an output signal at an output frequency greater than the fundamental frequency in response to the second output and the first output.

US Patent:

6486740, Nov 26, 2002

Filed:

Aug 28, 2000

Appl. No.:

09/651568

Inventors:

David J. Baldwin - Allen TX
Ross E. Teggatz - McKinney TX
Joseph A. Devore - Richardson TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H03F 114

US Classification:

330292, 330107, 330294

Abstract:

One aspect of the invention is an integrated circuit ( or ) comprising an amplifier ( or ) having at least two poles in its frequency response and an output impedance compensation circuit (M A, M M AC or M A, M M M AC ) coupled to an output node ( ) of the amplifier ( or ). The output impedance compensation circuit (M A, M M AC or M A, M M M AC ) is operable to create a feedback signal proportional to the impedance of an output load ( ) coupled to the output node ( ), and create a zero in the frequency response of the amplifier ( or ) in response to the feedback signal between the at least two poles.

US Patent:

6563284, May 13, 2003

Filed:

Nov 21, 2001

Appl. No.:

09/989065

Inventors:

Alexander Noam Teutsch - Dallas TX
Zbigniew Jan Lata - Dallas TX
David John Baldwin - Allen TX
Ross E. Teggatz - McKinney TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

G05B 1128

US Classification:

318599, 318716, 318798, 318811

Abstract:

The present invention relates to a motor drive system which comprises a fan controller circuit operable to generate a PWM control signal for control of a motor speed. The fan controller circuit comprises a current detection circuit and a motor speed determination circuit. The system further comprises a fan driver circuit operable to drive a motor at a duty cycle based on the PWM control signal from the fan controller circuit. The fan driver circuit comprises a current sink circuit operable to draw current from the PWM control signal when the PWM control signal is high and when the motor reaches a predetermined position. In the addition, the current detection circuit is operable to detect the current draw on the PWM control signal and provide an indication signal to the fan speed determination circuit associated with such detection. Further, the motor speed determination circuit is operable to determine the speed of the motor based upon a timing associated with successive current draw detections. The present invention also relates to a method of determining a motor speed which comprises driving a motor at a duty cycle dictated by a PWM control signal and detecting a predetermined rotor position of the motor.

US Patent:

6608521, Aug 19, 2003

Filed:

May 14, 2002

Appl. No.:

10/145417

Inventors:

David J. Baldwin - Allen TX
Timothy J. Legat - Allen TX
Sanmukh Patel - Richardson TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H03F 338

US Classification:

330 10, 323268

Abstract:

A control circuit ( ) for a switch mode power converter having precise control of amplitude and frequency that does not exhibit overshoot error nor undershoot error during a fast charge cycle nor a fast discharge cycle, respectively. In a first embodiment, the control circuit ( ) does not exhibit undershoot error during a fast discharge cycle. The control circuit ( ) comprises an oscillator ( ) for providing a periodic carrier signal comprising a sawtooth wave output signal (V ). The oscillator ( ) includes a capacitor (C ) charged and discharged to the power supply voltage (V ) to provide the sawtooth wave output signal (V ). In addition, the oscillator ( ) includes a switching circuit ( ) coupled to the reference voltage level (V ). The control circuit ( ) further includes a gain circuit ( ) having a reference voltage input (V ), voltage input (V ) and an output (Out). The reference voltage input (V ) receives the reference voltage(V ).

US Patent:

6650100, Nov 18, 2003

Filed:

Sep 3, 2002

Appl. No.:

10/233811

Inventors:

James A. Kohout - Dallas TX
David J. Baldwin - Allen TX
Ross E. Teggatz - McKinney TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

G05F 1563

US Classification:

323282

Abstract:

A multiple mode switching regulator with a bootstrap technique includes an inductor ; a high side input switch coupled to a first end of the inductor ; a low side input switch coupled to the first end of the inductor ; a high side driver coupled to a control node of the high side input switch ; a low side driver coupled to a control node of the low side input switch ; a high side output switch coupled to a second end of the inductor ; a low side output switch coupled to the second end of the inductor ; a first bootstrap capacitor coupled between the first end of the inductor and a voltage supply node of the high side driver ; a second bootstrap capacitor coupled between the second end of the inductor and a voltage supply node of the low side driver ; and a first diode coupled between the voltage supply node of the high side driver and the voltage supply node of the low side driver. The two bootstrap capacitors and are employed on both sides of inductor to provide gate voltage to high side input switch through high side driver in any mode of operation. This allows the regulator to work in three modes of operation without different external components or configurations depending on the mode.

US Patent:

6674621, Jan 6, 2004

Filed:

Nov 21, 2001

Appl. No.:

09/989066

Inventors:

Alexander Noam Teutsch - Dallas TX
Zbigniew Jan Lata - Dallas TX
David John Baldwin - Allen TX
Ross E. Teggatz - McKinney TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

F21V 704

US Classification:

361 31, 361 87, 361 915

Abstract:

The present invention relates to a reverse bias protection structure which comprises a PMOS transistor structure having a drain portion, a gate portion, a source portion and a backgate portion, wherein the gate portion is coupled to a first voltage potential, the source portion is selectively coupleable to a power supply, and the drain portion is selectively coupleable to a circuit needing power to be supplied thereto from the power supply. The reverse bias protection structure further comprises a Schottky diode structure having an anode coupled to the source portion of the PMOS transistor structure, and a cathode coupled to the backgate portion of the PMOS structure. Under forward bias conditions, the PMOS transistor conducts and exhibits a small voltage drop thereacross. Under reverse bias conditions, the PMOS transistor is off and the Schottky structure is reverse biased, thus preventing current through the protection structure.

US Patent:

6678829, Jan 13, 2004

Filed:

Jun 19, 2000

Appl. No.:

09/596451

Inventors:

Ross E. Teggatz - McKinney TX
David J. Baldwin - Allen TX
Sanmukh M. Patel - Addison TX
Juan F. Alvarez - Richardson TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

G06F 128

US Classification:

713300, 361103

Abstract:

An integrated solution to power management and distribution on a power bus, such as needed for an IEEE 1394 compliant expansion board. The integrated circuit includes a uni-directional switch on the input and one or more bi-directional switches on one or more outputs. Current can flow from the system power supply to any connected peripherals via the uni-directional switch and bi-directional switches, or can flow from the peripheral having the highest voltage power supply to the other peripherals via the bi-directional switches, but current will not flow back to the main system because of the unidirectional switch connected to the system power supply. Over-current conditions are quickly detected and the bi-directional switch is opened to prevent damage or over-heating. The switches are preferably fabricated as power FETs using NMOS technology. Several integrated circuits can be cascaded together to accommodate multiple peripherals.

US Patent:

6696861, Feb 24, 2004

Filed:

Nov 1, 2002

Appl. No.:

10/285900

Inventors:

David J. Baldwin - Allen TX
Zbigniew J. Lata - Plano TX
Sanmukh M. Patel - Richardson TX
Ross E. Teggatz - McKinney TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H03K 1716

US Classification:

326 83, 326 86, 326 27

Abstract:

A switch mode controller circuit includes: a hysteretic comparator HYST_COMP for monitoring an output of a switch mode circuit; a standard comparator PHASE_COMP for monitoring a phase of the switch mode circuit; a logic block having a first input coupled to a clock signal generator Oscillator, a second input coupled to an output of the hysteretic comparator HYST_COMP, and a third input coupled to an output of the standard comparator PHASE_COMP, wherein the logic block generates switching cycles based on a fixed ON/OFF time during a first part of a cycle and based on a hysteretic control during a second part of the cycle.

Address:

1209 Shady Oaks Cir, McKinney, TX 75070

Phone:

8176773578

VIN:

1G1YY26U475115725

Make:

CHEVROLET

Model:

CORVETTE

Year:

2007