LTC4449 datasheet(82/108 Pages) LINER

82 / 108 page

LTC3882-1

Rev A

For more information www.analog.com

IOUT_CAL_GAIN

The IOUT_CAL_GAIN command is used to set the resistance value of the output current sense element in milliohms.

This command has two data bytes in Linear_5s_11s format.

MFR_IOUT_CAL_GAIN_TC

The MFR_IOUT_CAL_GAIN_TC command sets the temperature coefficient of the output current sense element in

ppm/°C. Effective sense resistance, in milliohms, is computed by the LTC3882-1 as

RSENSE = IOUT_CAL_GAIN • (1 + 1E-6 • MFR_IOUT_CAL_GAIN_TC • (READ_TEMPERATURE_1 – 27))

This command has two data bytes representing a 2’s compliment integer.

IOUT_OC_FAULT_LIMIT

The IOUT_OC_FAULT_LIMIT command sets the value of the instantaneous peak output current, in amperes, which

will cause the OC supervisor to detect an output overcurrent fault. The LTC3882-1 uses the computed effective sense

resistance and the voltage across the ISENSE± inputs to determine the output current. The programmed limit voltage is

rounded to the nearest 0.4mV in a range from 0.0mV to 80.0mV. Output overcurrent faults are ignored during TON_RISE

and TOFF_FALL output sequencing.

This command has two data bytes in Linear_5s_11s format.

IOUT_OC_WARN_LIMIT

TheIOUT_OC_WARN_LIMITcommandsetsthevalueoftheoutputcurrentmeasuredbytheADC,inamperes,thatcauses

anoutputovercurrentwarning.Toprovidemeaningfulresponses,thisvalueshouldbesetbelowIOUT_OC_FAULT_LIMIT

minus 1/2 of the maximum anticipated ripple current. If the IOUT_OC_WARN_LIMIT is exceeded, the device:

• Sets the IOUT Bit in the STATUS_WORD

• Sets the IOUT Overcurrent Warning Bit in the STATUS_IOUT Command

• Notifies the Host by Asserting ALERT, Unless Masked

Output overcurrent warnings are ignored during TON_RISE and TOFF_FALL output sequencing.

This command has two data bytes in Linear_5s_11s format.

OUTPUT CURRENT AND LIMITS

COMMAND NAME

CMD

CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT UNITS NVM

DEFAULT

VALUE

IOUT_CAL_GAIN

0x38 Ratio of ISENSE± voltage to sensed current.

R/W Word

L11

mΩ

0.63mΩ

0xB285

MFR_IOUT_CAL_GAIN_TC

0xF6 Output current sense element temperature

coefficient.

R/W Word

ppm/°C

3900ppm/°C

0x0F3C

IOUT_OC_FAULT_LIMIT

0x46 Output overcurrent fault limit.

R/W Word

L11

29.75A

0xDBB8

IOUT_OC_WARN_LIMIT

0x4A Output overcurrent warning limit.

R/W Word

L11

20.0A

0xDA80

Related commands: STATUS_IOUT, SMBALERT_MASK, READ_IOUT, MFR_IOUT_PEAK, READ_POUT, IOUT_OC_FAULT_RESPONSE, MFR_VOUT_AVP

PMBus COMMAND DETAILS (Output Current and Limits)

LTC4449 Datasheet(PDF) 82 Page - Linear Technology

LTC4449 Datasheet(HTML) 82 Page - Linear Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL