L5973D datasheet(12/17 Pages) STMICROELECTRONICS

поискавой системы для электроныых деталей

L5973D датащи(PDF) 12 Page - STMicroelectronics

номер детали	L5973D

подробное описание детали	2.5 A switch step down switching regulator

PDF	17 Pages

Scroll/Zoom	100%

производитель	STMICROELECTRONICS [STMicroelectronics]

домашняя страница	http://www.st.com

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12 / 17 page

Application ideas

L5973D

12/17

When an output voltage below the internal reference (1.235 V) is required, the circuit

reported in the figure 18 can been used. In this case the minimum voltage reachable is 0.6 V

and can be easily calculated with the following formula:

VOUT = VFB - [(VREF - VFB)x(R2 / R1)]

If the load is not present, a resistor connected between VOUT and GND is required in order

to avoid that the voltage across COUT increases.

The value of this resistor has to be calculated taking into account that the current flowing

through this resistance has to be higher than the current flowing through R2.

Figure 19.

Output voltage below the 1.235 V internal voltage reference

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