Synchronous switching regulator which employs switch voltage-dro

Details Synchronous switching regulator which employs switch voltage-dro Synchronous switching regulator which employs switch voltage-dro

1997-06-13

1998-12-08

Berhane, Adolf

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323351, G05F 1563

Patent

active

058475540

ABSTRACT:
Synchronous switching regulator circuits with voltage-drop sensing circuitry are presented in which the current sensing element typically in series with a load is eliminated, resulting in reduced dissipative losses and less costly manufacture. Voltage drops are measured across the regulator's synchronous switching element, and, in some cases, also across the regulator's main switching element. Measured voltage drops are used to derive a current analog signal indicative of the amount of current being supplied by the regulator. The current signal is then compared with a threshold value to determine whether the regulator's duty cycle should be varied.

REFERENCES:
patent: 4823070 (1989-04-01), Nelson
patent: 5414341 (1995-05-01), Brown
patent: 5479090 (1995-12-01), Schultz
patent: 5552695 (1996-09-01), Schwartz
LTC1148/LTC1148-3.3/LTC1148-5 High Efficiency Synchronous Step-Down Switching Regulators (data sheet), Linear Technology Corporation, Milpitas, CA (1993).
Si9150 Synchronous Buck Converter Controller (data sheet), Siliconix Incorporated, Santa Clara, CA (Apr. 1994).
LTC1430 High Power Step-Down Switching Regulator Controller (data sheet), Linear Technology Corporation, Milpitas, CA (1995).
MAXIM Step-Down Controllers with Synchronous Rectifier for CPU Power (data sheet), Maxim Integrated Products, Inc., Sunnyvale, CA (Apr. 1996).
LTC1435 High Efficiency Low Noise Synchronous Step-Down Switching Regulator (data sheet), Linear Technology Corporation, Milpitas, CA (1996).

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