PM6686 datasheet(25/50 Pages) STMICROELECTRONICS

部件名	PM6686

功能描述	Constant ON-time control

PDF	50 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

25 / 50 page

PM6686

Device description

Doc ID 15281 Rev 4

25/50

Figure 45.

Resistor divider to configure the output voltage

Where R1, R2 are the resistors of the FB1 pin divider, as shown in Figure 2.

OUT2 output voltage is programmed with REFIN2 pin. Fixed output voltage is selected

connecting REFIN2 to VREF3 (OUT2 = 1.05 V) or to VCC (OUT2 = 3.3 V).

When the REFIN2 voltage is between 0.7 V and 2.5 V, OUT2 output voltage tracks REFIN2

voltage. When REFIN2 is lower than 0.5 V the section is turned OFF.

Table 7.

Switching output voltages configuration

Output

control pin

Control pin

connected to

Operation mode

Output voltage

OUT1

FB1

GND

Fixed

5 V

VCC

Fixed

1.5 V

Resistor divider

Adj

OUT2

REFIN2

VCC

Fixed

3.3 V

VREF3

Fixed

1.05 V

Ext source

Tracking

=REFIN2

FB1

PHASE

COUT

VOUT

⎟

⎠

⎞

⎜

⎝

⎛

⋅

OUT

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