A5975AD datasheet(39/50 Pages) STMICROELECTRONICS

Nome de Peças	A5975AD

Descrição Electrónicos	Voltage feed-forward

PDF	50 Pages

Scroll/Zoom	100%

Fabricante Electrônico	STMICROELECTRONICS [STMicroelectronics]

Página de início	http://www.st.com

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39 / 50 page

A5975AD

Application information

Doc ID 018761 Rev 1

39/50

Equation 40

Equation 41

An important point to take into account is that the ground pin of the device is connected to

the negative output voltage. Therefore, the device is subjected to a voltage equal to VIN-VO,

which must be lower than 36 V (the maximum operating input voltage).

Figure 27.

Negative buck-boost regulator

8.9

Floating boost current generator

The A5975AD does not support a nominal boost conversion as this topology requires a low

side switch, however, a floating boost can be useful in applications where the load can be

floating. A typical example is a current generator for LEDs driving, as the LED does not

require a connection to the ground.

Figure 28.

Floating boost topology

512

----------------

0.706

LOAD

–

---------------

0.5

10.706

–

------------------------

1.7A

AM09670v1

A5975AD

A5975AD Folha de dados(PDF) 39 Page - STMicroelectronics