Voltage Regulators Circuit Diagrams

3-A Wide-input Adjustable Switching Regulator Schematic Circuit Diagram

The PTN78060, developed by Texas Instruments (TI), belongs to a series of high-efficiency buck-boost integrated switching regulator (ISR). Enclosed in a caseless, double-sided package with outstanding thermal properties, it also meets RoHS compliance standards. Notably, the PTN78060 devices operate over an impressively wide input voltage range.

3-A Wide-input Adjustable Switching Regulator Schematic Circuit Diagram 1

Note that the —A version supplies a negative output voltage. The devices provide high-efficiency step-down voltage conversion for loads of up to 3 A.
The PTN78060 devices are suited to a wide variety of general-purpose applications that operate off 12-V, 24-V, or tightly regulated 28-V dc power, hence are ideal for running low-voltage electronics from a very high-power 24-V battery unit salvaged from an electric wheelchair and migrated into a robot.

3-A Wide-input Adjustable Switching Regulator Schematic Circuit Diagram 2

3-A Wide-input Adjustable Switching Regulator Schematic Circuit Diagram 3
The output voltage Vo can be set to any value over a wide adjustment range using a single external resistor RsET, using the equation

RSET = 54.9kL2x(1.25V/Vo-VmiN) – Rp

Setting Output Voltage and Default State

If pin 4 is left unconnected, the output voltage defaults to its minimum value. Focusing on the two positive-output regulators, the -W version requires VMIN and Rp values of 2.5 V and 6.49 kΩ, respectively. In contrast, for the -H variant, the appropriate values are 11.824 V and 6.65 kΩ. To maintain regulation, the input voltage must exceed the output voltage by a specific minimum differential voltage.

PWM Range and Operating Voltage Requirements

Consideration must be given to the pulse width modulation (PWM) range of the regulator’s internal control circuit. Stable operation necessitates a duty cycle above a certain minimum percentage, determining the maximum permissible ratio between input and output voltages. For optimal performance, the PTN78060x’s operating input voltage range must meet these criteria:

For PTN78060W devices delivering output voltages below 10 V. The minimum input voltage is (V0 + 2 V) or 7 V, whichever is higher.

Texas Instruments PTN78060 Integrated Switching Regulator

The Texas Instruments PTN78060 Integrated Switching Regulator (ISR) offers efficient step-down voltage conversion for loads up to 3A. The PTN78060W ISR can be adjusted to any value within the 2.5V to 12.6V output voltage range, while the PTN78060H can be set between 11.85V and 22V.

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