ADP1055ACPZ-R7 datasheet(24/140 Pages) AD

24 / 140 page

ADP1055

Data Sheet

Rev. A | Page 24 of 140

An additional range of 480 mV (single-ended input only) can

be used for high-side sensing or simply as an input with a

higher range (see Figure 31). The high input range is used for

operation in single-ended mode, where external circuitry must

be provided for level shifting of the current signal.

Figure 31. Single-Ended High-Side Sensing

The READ_IOUT command reports the average output current;

this reading is updated every 2.6 ms.

ADCs FOR VOLTAGE SENSING

VFF ADC for Input Voltage

The VFF pin is typically used for the monitoring and protection

of the primary side voltage. Figure 32 shows a typical configuration

for the feedforward circuit.

Figure 32. Feedforward Configuration

The input voltage signal can be sensed at the secondary winding

of the isolation transformer before the output inductor and must

be filtered by an RCD network to eliminate the voltage spike at

the switch node (see Figure 32).

In nonisolated topologies, the VFF ADC is connected directly

to the primary voltage via a resistive divider with some filtering

to eliminate voltage spikes on the bulk capacitor when the power

switch is turned on or off. The READ_VIN command reports

the average input voltage; this reading is updated every 10.5 ms.

VS ADC for Output Voltage

The VS± pins of the ADP1055 are used for the monitoring,

control, and protection of the power supply output. Typically,

the output voltage is divided down using a resistive divider such

that at the rated output, there is 1.0 V on the VS± pins. The

READ_VOUT command reports the average output voltage;

this reading is updated every 10.5 ms.

ADCs FOR TEMPERATURE SENSING

For information about the temperature sensing ADCs, see the

Temperature Sensing section.

CS2–

CS2+

AGND

CS2+ RANGE: 0mV TO 480mV

CS2 FAST OCP

0mV TO 600mV/7 BITS

(STEP SIZE 9.52mV)

CS2 ADC

IOUT_OC_LIMIT

IOUT_UC_LIMIT

CS2 IREV LIMIT

0mV TO –30mV

(STEP SIZE 0.4762mV)

ILOAD

RSNS

VOUT

ADP1055

DIGITAL

FILTER

1/x

DPWM

ENGINE

VFF

ADC

0V TO 1.6V

0.6V TO 1.6V

VFF

FEEDFORWARD

ADC

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