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ADP1046AACPZ-R7 Datasheet(PDF) 15 Page - Analog Devices |
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ADP1046AACPZ-R7 Datasheet(HTML) 15 Page - Analog Devices |
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15 / 88 page  Data Sheet ADP1046A Rev. 0 | Page 15 of 88 CURRENT SENSE The ADP1046A has two current sense inputs: CS1 and CS2±. These inputs sense, protect, and control the primary input current, secondary output current, and the share bus information. They can be calibrated to reduce errors due to external components. CS1 Operation (CS1) CS1 is typically used for the monitoring and protection of the primary side current, which is commonly sensed using a current transformer (CT). The input signal at the CS1 pin is fed into an ADC for current monitoring. The range of the ADC is 0 V to 1.4 V. The input signal is also fed into a comparator for pulse-by-pulse OCP protection. The typical configuration for the CS1 current sense is shown in Figure 14. CS1 1kΩ 10Ω I = 100mA I = 10A VIN OUTA OUTB OUTC OUTD ADC 12 BITS VREF FAST OCP 1:100 1V Figure 14. Current Sense 1 (CS1) Operation The CS1 ADC is used to measure the average value of the primary current; the reading is averaged every 2.62 ms in an asynchronous fashion to make fault decisions. The ADP1046A also writes the 12-bit CS1 reading every 10 ms to Register 0x13. The fast OCP comparator is used to limit the instantaneous primary current within each switching cycle and has a nominal threshold of 1.2 V. Various thresholds and limits can be set for CS1, as described in the Current Sense and Current Limit Registers section. CS2 Operation (CS2+, CS2−) CS2+ and CS2− are differential inputs used for the monitoring and protection of the secondary side current. The full-scale range of the CS2 ADC is programmable to 60 mV or 120 mV. The differential inputs are fed into an ADC through a pair of external resistors that provide the necessary level shifting. The device pins, CS2+ and CS2−, are internally regulated to approxi- mately 1 V by internal current sources. When using low-side current sensing, the current sources are 200 µA; therefore, the required resistor value is 1 V/200 µA = 5 kΩ. When using high-side current sensing, the current sources are 2 mA; therefore, the resistor value required is (VOUT − 1 V)/2 mA. In the case of VOUT = 12 V, the required resistor value is 5.5 kΩ. Typical configurations are shown in Figure 15 and Figure 16. Various thresholds and limits can be set for CS2±, such as OCP. These thresholds and limits are described in the Current Sense and Current Limit Registers section. CS2+ CS2– ADC 12 BITS 5kΩ 5kΩ 1V I 200µA 200µA Figure 15. Low-Side Resistive Current Sense (Recommended) CS2– CS2+ ADC 12 BITS 5.5kΩ 5.5kΩ 1V I 12V 2mA 2mA Figure 16. High-Side Resistive Current Sense When the CS2+ and CS2− inputs are not in use, connect them directly to PGND, and set CS2± to high-side current sense mode (Register 0x27[2] = 1). The CS2 ADC is used to measure the CS2 current; the reading is averaged every 2.62 ms in an asynchronous fashion. This averaged reading is used to make fault decisions, such as the CS2 OCP fault. The ADP1046A also writes the 12-bit CS2 reading every 10 ms to Register 0x18. |
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