ADP1053ACPZ-R7 datasheet(18/84 Pages) AD

18 / 84 page

ADP1053

Data Sheet

Rev. A | Page 18 of 84

DRIVER

ADC

CS1_A/

CS1_B

ADP1053

CS1 SENSING

REGISTERS

THRESHOLD

1.2V

CS1 OCP

VOUT

Figure 13. Current Sense 1 (CS1) Operation

ADC

ADP1053

CS SENSING

REGISTERS

THRESHOLD

CS OCP

VIN

Figure 14. Current Sense (CS) Operation

The CS ADCs measure the average current information, which

can be read via the PMBus/I2C interface. This information can

also be used for volt-second balance or current balance control.

For more information, see the Volt-Second Balance and Current

Balance section.

CS2 (CS2+_A/CS2+_B, CS2−_A/CS2−_B) Sensing

CS2_A and CS2_B are typically used for the monitoring and

protection of Channel A and Channel B, respectively. CS2_A/

CS2_B provide accurate current sensing and monitoring of

OCP conditions.

CS2_A/CS2_B current sensing can be configured using a low-

side sense resistor or a high-side sense resistor. Depending on

the common-mode voltage of the current sensing resistor, the

part must be programmed for low-side or high-side mode using

Bit 7 of Register 0xFE1A and Register 0xFE1B.

Typical configurations are shown in Figure 15 and Figure 16.

The differential inputs are fed into an ADC through a pair of

external resistors. Internal matching current sources (nominal

value of 200 μA for low-side sensing and 2 mA for high-side

sensing) are used to regulate the common-mode voltage of the

CS2 pins at approximately 1 V.

For both high-side and low-side current sensing, it is recom-

mended that a 500 pF to 1000 pF capacitor be connected from

the CS2_A/CS2_B pins to AGND.

When using low-side resistor current sensing, as shown in

Figure 15, the common-mode voltage at the sensing resistor is

approximately 0 V. The current sources are 200 μA in low-side

current sensing mode. Two matching 5 kΩ resistors are

recommended.

ADC

ADP1053

CS2 SENSING

REGISTERS

VOUT

CS2–_A/

CS2–_B

CS2+_A/

CS2+_B

CS2_A/

CS2_B

OCP

5kΩ

200µA

THRESHOLD

RSENSE

Figure 15. CS2 Low-Side Resistive Current Sensing

When high-side resistor current sensing is required, as shown

in Figure 16, the resistor value is calculated based on a 2 mA

high-side current source, as follows:

R = (VOUT − 1 V)/2 mA

For example, in a 28 V system with high-side current sensing,

the value of the resistors used at the CS2 pins is calculated by

R = (28 V − 1 V)/2 mA = 13.5 kΩ

ADC

ADP1053

CS2 SENSING

REGISTERS

VOUT

CS2+_A/

CS2+_B

CS2–_A/

CS2–_B

2mA

THRESHOLD

CS2_A/

CS2_B

OCP

RSENSE

Figure 16. CS2 High-Side Resistive Current Sensing

Matching resistors with 0.1% or better accuracy are recom-

mended to achieve the accuracy specifications.

The full-scale range of the CS2_A/CS2_B ADC is 120 mV. The

ADC registers have an update rate of 100 Hz with 12-bit resolution.

ADP1053ACPZ-R7 Folha de dados(PDF) 18 Page - Analog Devices

ADP1053ACPZ-R7 Folha de dados(HTML) 18 Page - Analog Devices

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

Folha de dados Download

Ligação URL