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| 型号： | ADP1043AFB100EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 12/72页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION ADP1043A 100W |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电源监控器/跟踪器/序列发生器 |
| 已用 IC / 零件： | ADP1043A |
| 主要属性： | * |
| 次要属性： | * |
| 已供物品： | 板 |
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ADP1043A
THEORY OF OPERATION
CURRENT SENSE
The ADP1043A has two individual current sense inputs: CS1
and CS2±. These inputs sense, protect, and control the output
current and the share bus information. They can be calibrated
to remove any errors due to external components.
CS1 Operation (CS1)
CS1 is typically used for the monitoring and protection of the
primary side current. This is commonly known as the current
transformer (CT) method of current sensing. The input signal
at the CS1 pin is fed into an ADC for current monitoring. The
range of the ADC is 0 V to 1.38 V. The input signal is also fed
into a comparator for fast OCP protection. The typical config-
V IN
CS2 Operation (CS2+, CS2?)
CS2± is used for the monitoring and protection of the secondary
side current. The full-scale range of the CS2 ADC is 225 mV. The
nominal full load voltage drop can be configured for 37.5 mV,
75 mV, or 150 mV. The differential inputs are fed into an ADC
through a pair of external resistors. When using low-side current
sensing, a 10 kΩ resistor is required. When using high-side current
sensing, a 110 kΩ resistor is required (for a 12 V application).
Low-side current sensing is recommended because it provides
improved performance compared with high-side current sensing.
High-side current sensing is not supported for applications
where the output voltage is above 20 V common mode. (There
is not enough offset trim range above 20 V common mode.)
Various thresholds and limits can be set for CS2, such as OCP.
OUTA
OUTB
OUTC
OUTD
When not in use, both CS2 inputs should be connected through
10 kΩ resistors to PGND.
I = 10A
1V
CS1
ADC
12 BITS
I
12V
1k ?
10 ?
I = 100mA
VREF
FAST
1:100
OCP
110k ?
CS2+
110k ?
CS2–
Figure 10. Current Sense 1 (CS1) Operation
1V
ADC
12 BITS
The comparator effectively measures peak current, and the
ADC effectively measures the average current information.
This information is available through the I 2 C interface. Various
100μA
100μA
thresholds and limits can be set for CS1, such as OCP. These
Figure 11. High-Side Resistive Current Sense
I
10k ?
CS2–
10k ?
CS2+
100μA
1V
100μA
ADC
12 BITS
Figure 12. Low-Side Resistive Current Sense (Recommended)
Rev. 0 | Page 12 of 72
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