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AAT4610AIGV-1-T1 Datasheet(PDF) 8 Page - Advanced Analog Technology, Inc. |
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AAT4610AIGV-1-T1 Datasheet(HTML) 8 Page - Advanced Analog Technology, Inc. |
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8 / 11 page  Application Information Setting Current Limit In most applications, the variation in ILIM must be taken into account when determining RSET. The ILIM variation is due to processing variations from part to part, as well as variations in the voltages at IN and OUT, plus the operating temperature. See charts "Current Limit vs. Temperature" and "Output Current vs. VOUT." Together, these three factors add up to a ±25% tolerance (see ILIM specification in Electrical Characteristics section). Figure 1 illus- trates a cold device with a statistically higher cur- rent limit and a hot device with a statistically lower current limit, both with RSET equal to 10.5kΩ. While the chart, "RSET vs. ILIM" indicates an ILIM of 0.7A with an RSET of 10.5kΩ, this figure shows that the actual current limit will be at least 0.525A and no greater than 0.880A. Figure 1: Current Limit Using 10.5k Ω Ω. To determine RSET, start with the maximum current drawn by the load and multiply it by 1.33 (typical ILIM = minimum ILIM / 0.75). This is the typical cur- rent limit value. Next, refer to "RSET vs. ILIM" and find the RSET that corresponds to the typical current limit value. Choose the largest resistor available that is less than or equal to it. For greater precision, the value of RSET may also be calculated using the Ω 0 0.2 0.4 0.6 0.8 1 1.2 01 2 3 4 5 VOUT (V) 0.88A 0.525A Device with high current limit at -40 °C Device with low current limit at 85 °C AAT4610A Current Limited Load Switch 8 4610A.2006.9.1.3 Functional Block Diagram Current Limit 1.2V Reference Under- Voltage Lockout Over-Temperature Protection OUT SET GND R SET ON (ON) IN |
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