LT7184SRVPBF datasheet(33/52 Pages) AD

33 / 52 page

Data Sheet

LT7184S

analog.com

Rev. 0

33 of 52

Configuring Device Address with ASEL Pin

The MFR_ADDRESS command byte and ASEL pin set the 7-Bit device address on the PMBUS. Setting this command

to a value of 0x80 disables device addressing. The GLOBAL device address, 0x5A and 0x5B, cannot be deactivated. If

the ASEL pin is floating or connected to VDD18, the device uses the full MFR_ADDRESS value. If a resistor is connected

to ASEL according to Table 10, the four LSBs of the device address are determined by the ASEL resistor value.

Reading MFR_ADDRESS always returns the value loaded from EEPROM or written via PMBSus write. The value read

from the MFR_ADRESS is not affected by the ASEL pin. The LT7184S does not ignore the ASEL pin, even when

MFR_CONFIG_ALL_LT7184S is set to ignore the other resistor configuration pins. The 3 MSBs 6:4 of the device address

are always determined by 6:4 of MFR_ADDRESS.

Table 11. ASEL Configuration Resistor and LSBs of Device Address

ASEL Resistor

PMBus Device Address

Floating or VDD18

EEPROM

124kΩ

0x4F

107kΩ

0x4D

93.1kΩ

0x4D

80.6kΩ

0x4C

69.8kΩ

0x4B

60.4kΩ

0x4A

51.1kΩ

0x49

43.2kΩ

0x48

36.5kΩ

0x47

30.9kΩ

0x46

25.5kΩ

0x45

21.0kΩ

0x44

16.5kΩ

0x43

11.8kΩ

0x42

6.65kΩ

0x41

0 (grounded)

0x40

Operating Frequency Trade-Offs

The selection of the operating frequency is a trade-off between efficiency, component size, and input voltage range.

The advantage of high-frequency operation is that smaller inductor and capacitor values may be used, while the

primary disadvantage is lower efficiency and reduced maximum input voltage to avoid minimum on-time and

minimum off-time.

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