ADP1048ARQZ-R7 datasheet(33/84 Pages) AD

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Data Sheet

ADP1047/ADP1048

Rev. 0 | Page 33 of 84

POWER SUPPLY SYSTEM CALIBRATION AND TRIM

The ADP1047/ADP1048 allow the entire power supply to be

calibrated and trimmed digitally in the production environ-

ment. The device can calibrate items including the output

voltage, input voltage, input current, and input power, and it

can trim for tolerance errors introduced by sense resistors,

current transformers, and resistor dividers, as well as for its

own internal circuitry.

The part comes factory trimmed at 90% of the input range at a

3.3 V supply, but it can be re-trimmed by the user to compen-

sate for the errors introduced by external components. With the

exception of the gain and offset trim registers for input power,

the trim registers must be unlocked for write access. To unlock

the trim registers, write to the TRIM_PASSWORD register

(Register 0xD6).

OUTPUT VOLTAGE (VFB) CALIBRATION AND TRIM

The voltage sense inputs are optimized for sensing signals at

90% of the input range and cannot sense signals greater than

1.6 V. In a high voltage system, a resistor divider is required to

reduce the high voltage signal to below 1.6 V. It is recommended

that the high voltage signal be reduced to 1 V for best perfor-

mance. The resistor divider can introduce errors, which must be

trimmed out as follows:

Turn on the power supply with no load attached.

The output voltage is divided down by the feedback resistor

divider to supply 1 V across the VFB and AGND pins.

Use a calibrated multimeter to perform the output voltage

reading.

Adjust the VFB ADC gain trim register (Register 0xFE41)

until the power supply outputs the exact value in the

READ_VOUT register (Register 0x8B).

INPUT VOLTAGE (VAC) GAIN AND OFFSET TRIM

The input voltage sense point on the power rail requires an

external resistor divider to bring the signal within the operating

input range of the VAC ADC (0 V to 1.6 V). The resistor divider

can introduce errors, which must be trimmed out as follows:

Apply the maximum line voltage value to the input of the

power supply.

The VAC resistor divider divides this voltage down at the VAC

pin. The VAC resistor divider is programmed in linear format

using the VIN scale monitor register (Register 0xFE3B).

Adjust the VAC ADC gain trim register (Register 0xFE40)

until the VAC value (Register 0x88, READ_VIN) equals

the input voltage reading from a calibrated multimeter.

This step trims for errors in the resistor divider network.

For VAC offset trim, adjust the value in Register 0xFE53.

CURRENT SENSE GAIN AND OFFSET TRIM

The current sense can be calibrated digitally to remove any

errors due to external components.

Apply the maximum load to the output with the low line

input voltage.

To match the input current reading at the maximum

nominal input current, adjust the CS ADC gain trim

equals the measured result of the input current from

calibrated equipment.

If the 500 mV input range is used, adjust Register 0xFE42.

If the 750 mV range is used, adjust Register 0xFE7E.

For CS offset trim, adjust the values in Register 0xFE54 (500 mV

input range) or Register 0xFE7F (750 mV input range).

INPUT POWER GAIN AND OFFSET TRIM

The input power trim has separate trim registers for high line

and low line input.

Apply the maximum load to the output with the low line

input voltage.

Adjust the power metering gain trim for low line input

the READ_PIN register (Register 0x97) equals the

measured result of the input power from calibrated

equipment.

Apply the maximum load to the output with the high line

input voltage.

Adjust the power metering gain trim for high line input

the READ_PIN register (Register 0x97) equals the

measured result of the input power from the calibrated

equipment.

For input power offset trim, adjust the values in Register 0xFE33

(for low line input) and Register 0xFE8E (for high line input).

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