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ADP1290ACBZ-R7 데이터시트(PDF) 11 Page - Analog Devices |
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ADP1290ACBZ-R7 데이터시트(HTML) 11 Page - Analog Devices |
11 / 12 page Data Sheet ADP1290 TIMING Turn on delay is defined as the interval between the time that VEN exceeds the rising threshold voltage and when VOUT rises to ~10% of its final value. The ADP1290 includes circuitry that has a typical 250 μs turn on delay and a controlled rise time to limit the VIN inrush current. As shown in Figure 24 and Figure 25, the turn on delay is nearly independent of the input voltage. CH1 2.00V BW CH3 100mAΩ BW CH2 2.00V BW M400µs A CH4 1.04V T 10.40% 2 1 3 EN INPUT CURRENT OUTPUT Figure 24. Typical Turn On Time and Inrush Current, VIN = 2.5 V, COUT = 10 μF, RLOAD = 100 Ω CH1 2.00V BW CH3 200mAΩ BW CH2 5.00V BW M400µs A CH4 1.04V T 10.40% 2 1 3 EN INPUT CURRENT OUTPUT Figure 25. Typical Turn On Time and Inrush Current, VIN = 6.5 V, COUT = 10 μF, RLOAD = 100 Ω The rise time is defined as the time it takes the output voltage to rise from 10% to 90% of VOUT reaching its final value. The turn on delay is dependent on the rise time of the internal charge pump. For very large values of output capacitance, the RC time constant (where C is the load capacitance, CLOAD, and R is the RDSON||RLOAD) can become a factor in the rise time of the output voltage. Because RDSON is much smaller than RLOAD, an adequate approximation for RC is RDSON × CLOAD. An input or load capacitor is not required for the ADP1290; however, capacitors can suppress noise on the board. The turn off time is defined as the time it takes for the output voltage to fall from 90% to 10% of VOUT reaching its final value. The turn off time is also dependent on the RC time constant of the output capacitance (CLOAD) and load resistance (RLOAD). Figure 26 and Figure 27 show the typical turn off times with VIN = 6.5 V, COUT = 10 μF and 100 μF, and RLOAD = 100 Ω. CH1 2.00V BW CH2 2.00V BW M400µs A CH4 1.04V T 10.40% 2 1 EN OUTPUT Figure 26. Typical Turn Off Time, COUT = 10 μF, RLOAD = 100 Ω CH1 1.00V BW CH2 2.00V BW M400µs A CH4 1.08V T 10.40% 2 1 EN OUTPUT Figure 27. Typical Turn Off Time, COUT = 100 μF, RLOAD = 100 Ω CURRENT AND THERMAL OVERLOAD PRECAUTIONS The ADP1290 is not protected against damage due to excessive power dissipation and does not have thermal overload protection circuits. To prevent permanent damage, never allow current through the ADP1290 to exceed its rated value for more than a few milliseconds. Permanent damage can also occur if the output is shorted to ground THERMAL CONSIDERATIONS To guarantee reliable operation, the junction temperature of the ADP1290 must not exceed 105°C. To ensure that the junction temperature stays below this maximum value, the user must be aware of the parameters that contribute to junction temperature changes. These parameters include ambient temperature, power dissipation in the power device, and thermal resistances between the junction and ambient air (θJA). The θJA number is dependent on the package assembly and the amount of copper used to solder the package pins to the PCB. Rev. 0 | Page 11 of 12 |
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