L5973D datasheet(12/17 Pages) STMICROELECTRONICS

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L5973D Scheda tecnica(PDF) 12 Page - STMicroelectronics

Il numero della parte	L5973D

Spiegazioni elettronici	2.5 A switch step down switching regulator

PDF	17 Pages

Scroll/Zoom	100%

Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	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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