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| 型号： | ADP1043A-USB-Z |
| 厂商： | Analog Devices Inc |
| 文件页数： | 22/72页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD DIG POWER SUPPLY |
| 标准包装： | 1 |
| 附件类型： | 连接 USB 至 I2C 的接收器 |
| 适用于相关产品： | ADP1043A |
| 相关产品： | ADP1043AACPZ-RLDKR-ND - IC SECONDARY SIDE CTRLR 32LFCSP ADP1043AACPZ-RLCT-ND - IC SECONDARY SIDE CTRLR 32LFCSP ADP1043AACPZ-RLTR-ND - IC SECONDARY SIDE CTRLR 32LFCSP |
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ADP1043A
POWER SUPPLY SYSTEM AND FAULT MONITORING
The ADP1043A has extensive system and fault monitoring
capabilities. The system monitoring functions include voltage,
current, power, and temperature readings. The fault conditions
include out-of-limit values for current, voltage, power, and tem-
perature. The limits for the fault conditions are programmable.
The ADP1043A has an extensive set of flags that are set when
certain thresholds or limits are exceeded. These thresholds and
limits are described in the Fault Registers section.
FLAGS
The ADP1043A has an extensive set of flags that are set when
certain limits, conditions, and thresholds are exceeded. The
real-time status of these flags can be read in Register 0x00 to
Register 0x03. The response to these flags is individually
programmable. Flags can be ignored or used to trigger tasks
such as turning off certain PWM outputs or the OrFET GATE
output. Flags can also be used to turn off the power supply. The
ADP1043A can be programmed to respond when these flags are
reset. For more information, see Register 0x08 to Register 0x0D.
The ADP1043A also has a set of latched fault registers
(Register 0x04 to Register 0x07). The latched fault registers
have the same flags as Register 0x00 to Register 0x03, but the
flags in the latched registers remain set so that intermittent
faults can be detected. Reading a latched register resets all the
flags in that register.
MONITORING FUNCTIONS
The ADP1043A monitors and reports several signals, including
voltages, currents, power, and temperature. All these values are
stored in individual registers and can be read through the I 2 C
interface. See the Value Registers section for more details.
VOLTAGE READINGS
The VS1, VS2, and VS3 ADCs have an input range of 1.55 V.
The outputs of the ADCs are 12-bit values, which means that
the LSB size is 1.55 V/4096 = 378.4 μV. The user is limited to an
input range of 1.5 V, which means that the ADC output code is
limited to 1.5 V/378.4 μV = 3964.
The equation to calculate the ADC code at a certain voltage
(Vx) is given by the following formula:
In a 12 V system, this equates to
V OUT = ( VSx_Voltage_Value /2643) × 12 V
CURRENT READINGS
CS1 Pin
DC Input Voltage
The CS1 ADC is identical in design to the VS1, VS2, and VS3
ADCs. Therefore, the description in the Voltage Readings section
also applies to the CS1 ADC. When there is exactly 1 V on the
CS1 pin, the value in the CS1 value register (Register 0x13)
reads 2968.
CS1 has an input range of 1.38 V. The ADC performs a 12-bit
reading conversion on this value, which means that the LSB size
is 1.38 V/4096 = 337 μV.
The equation to calculate the ADC code at a certain CS1 input
voltage (Vx) is given by the following formula:
ADC Code = Vx /337 μV
For example, when there is 1 V on the CS1 input pin
ADC Code = 1 V/337 μV
ADC Code = 2968
AC Input Voltage
CS1 often receives a rectified ac signal through a current
transformer. In this case, the ADC has a frequency response
(see Figure 27).
105
103
101
99
97
95
93
91
89
87
85
ADC Code = Vx /378.4 μV
1k
10k 100k
CS1 INPUT FREQUENCY (Hz)
For example, when there is 1 V on the input of the ADC
ADC Code = 1 V/378.4 μV
ADC Code = 2643
In a 12 V application, the 12 V reading is divided down using
a resistor divider network to provide 1 V at the sense pin.
Therefore, to convert the register value to a real voltage, use
the following formula:
V OUT = ( VSx_Voltage_Value /2643) × (( R1 + R2 )/ R2 )
Figure 27. CS1 ADC Frequency Response
To compensate for this frequency response, the multiplication
factor (M) should be used, as shown in the following equation:
M = (?2 × 10 ?18 × f SW 3 ) + (2 × 10 ?12 × f SW 2 ) + (2 × 10 ?8 × f SW ) + 0.9998
where f SW is the switching frequency of the power supply.
Using the multiplication factor (M) results in a more accurate
reading. This formula can be used by an MCU or other system
monitoring device. The ADP1043A GUI has the option to use
this formula.
Rev. 0 | Page 22 of 72
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