SK645SLASH50SLASHSA datasheet(7/30 Pages) ONSEMI

7 / 30 page

SECO−MDK−4KW−65SPM31−GEVB

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Auxiliary Power Supplies

There are three auxiliary supplies on the power board to

provide the necessary 15 Vdc, 5 Vdc, and 3.3 Vdc rails. The

first one is a non−isolated buck converter using NCP1063.

This auxiliary supply provides the 15 Vdc, which are

necessary for the IPM drivers. The NCP1063 high−voltage

switcher serves well this purpose, featuring a built−in 700 V

MOSFET with RDS(on) of 11.4 W and 100 kHz switching

frequency. NCP1063 is fed directly from the high−voltage

DC−Link. A minimum 90 V DC−Link voltage is required

for operation. Next, the FAN8303 non−isolated buck is used

to convert the 15 Vdc to the 5 Vdc that is necessary for the

UCB controller circuitry. Last but not least, the LDO

NCP718 converts the 5 Vdc to 3.3 Vdc, necessary for the

current measuring and protection circuitry, and for the

integrated UCB NCD98011 ADC modules. The

non−isolated power supplies provides a simple and effective

solution for industrial and commercial motor control

applications. More details about the auxiliary power

supplies can be found in the corresponding ICs data sheets,

[3], [4], and [5], respectively. Last but not least, the power

rating of the auxiliary power supplies can be found in

Table 1.

EEPROM

The main power board is equipped with the CAT24C512

EEPROM unit. The CAT24C512 is an EERPOM Serial

512−Kb I2C, which is internally organized as 65,536 words

of 8−bits each. It features a 128−byte page write buffer and

supports the Standard (100 kHz), Fast (400 kHz) and

Fast−Plus (1 MHz) I2C protocol. External address pins

make it possible to address up to eight CAT24C512 devices

on the same bus. The device Serial Click and Serial Data pins

of the CAT24C512 (pins DIO_1_1, DIO_1_2) are routed to

the UCB controller B35 buss (B35_L16_N and B35_L16_P,

respectively), via CON4 (pin 13 and pin 14). The data sheet

of CAT24C512 EEPROM device can be found in [8].

SCHEMATIC AND DESIGN

To meet customer requirements and make the evaluation

board a basis for development, all necessary technical data

like schematics, layout and components are included in this

chapter. This section will also discuss the design remarks,

trade−offs and recommendations for the design.

NCP1063 15 V Auxiliary Power Supply

As mentioned earlier, there are three Auxiliary power

supplies that generate the necessary voltage rails for the

proper function of the MDK_SPM31 and UCB controller

boards. The NCP1063 is a non−isolated buck that is used as

converter from DC−Link to 15 Vdc output, to supply the

IPM board, as well as the UCB board and Op−Amp circuitry

through the FAN8303 and NCP718. The maximum power

demand is up to 4.6 W. Figure 5 depicts the schematic of the

15 Vdc auxiliary power supply. The design and sizing of the

passive components has been inspired by the applications

notes in [3]. The desired output voltage value can be set by

tuning the values of the voltage divider (R1 and R3)

connected to the FB pin. Additionally, the value of C6 on the

COMP pin is tuned empirically to reflect the desired voltage

at the converter output. It is noted that the frequency Jittering

function helps spreading out energy in conducted noise

analysis. To improve the EMI signature at low power levels,

the jittering remains active in frequency foldback mode.

Finally, the switching frequency is 100 kHz, which allows

designs with small inductor (for this design we used 560

mH,

see L2) and output capacitance requirements (for this design

we used two 220

mF, see C8 and C9) and low current ripple

output.

Figure 5. Schematic of Auxiliary 15 Vdc Power Supply

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