UM0240 datasheet(7/39 Pages) STMICROELECTRONICS

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UM0240

Power supply

7/39

Power supply

Board components require the following voltage supplies.

These supplies are all derived from an input power supply that can be taken from four

different sources:

PLM 10V: connected to the 10V line of the PLM connector

5V Motor: connected to the 5V line of the Motor connector

Phone Jack: external connector, compatible with common notebook power supply

connectors, bringing power supply in the 5V÷ 35V range

USB 5V: connected to the 5V line of the USB supply

This enhanced flexibility of source and source voltage selection coexists due to diodes D7,

D8, D10 and D12, which prevent the reverse current flowing in the supply inputs, keeping

different sources independent.

The higher voltage input will be the dominant supply.

LED D11 is turned on when the power supply is active.

Table 1.

Voltages present on board

Function

Supply

Converter

Device

Input Range

Output Value

Main Power

Supply

VDD

Switching

Converter

(Buck)

L5973D

5V ÷ 35V

MCU Flash

Programming

VPP

Regulated

Charge Pump

Converter

ST662A (pin VOUT)

Vdd

12V

OpAmp negative

supply

-5V

Non regulated

Charge Pump

ST662A (pin C1-)

Vdd

-5

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