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ADP1707ARDZ-0.75R7 Fiches technique(PDF) 11 Page - Analog Devices |
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ADP1707ARDZ-0.75R7 Fiches technique(HTML) 11 Page - Analog Devices |
11 / 20 page ADP1706/ADP1707/ADP1708 Rev. 0 | Page 11 of 20 VTRK (V) ADJUSTABLE OUTPUT VOLTAGE (ADP1708) The ADP1708 can have its output voltage set over a 0.8 V to 5.0 V range. The output voltage is set by connecting a resistive voltage divider from OUT to ADJ. The output voltage is calculated by VOUT = 0.8 V (1 + R1/R2) (2) where: R1 is the resistor from OUT to ADJ. R2 is the resistor from ADJ to GND. The maximum bias current into ADJ is 100 nA, so for less than 0.5% error due to the bias current, use values less than 60 kΩ for R2. TRACK MODE (ADP1707) The ADP1707 includes a tracking mode feature. As shown in Figure 30, if the voltage applied at the TRK pin is less than the nominal output voltage, OUT is equal to the voltage at TRK. Otherwise, OUT regulates to its nominal output value. 4.0 0 05.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 VIN = 3.8V VOUT = 3.3V ILOAD = 10mA Figure 30. ADP1707 Output Voltage vs. Tracking Voltage For example, consider an ADP1707 with a nominal output voltage of 3.3 V. If the voltage applied to its TRK pin is greater than 3.3 V, OUT maintains a nominal output voltage of 3.3 V. If the voltage applied to TRK is reduced below 3.3 V, OUT tracks this voltage. OUT can track the TRK pin voltage from the nominal value all the way down to 0 V. A voltage divider is present from TRK to the error amplifier input with a divider ratio equal to the divider from OUT to the error amplifier, which sets the output voltage equal to the tracking voltage. Both divider ratios are set by postpackage trim, depending on the desired output voltage. ENABLE FEATURE The ADP1706/ADP1707/ADP1708 use the EN pin to enable and disable the OUT pin under normal operating conditions. As shown in Figure 31, when a rising voltage on EN crosses the active threshold, OUT turns on. When a falling voltage on EN crosses the inactive threshold, OUT turns off. TIME (10ms/DIV) VIN = 5V VOUT = 1.6V COUT = 4.7μF ILOAD = 10mA EN OUT Figure 31. ADP1706 Typical EN Pin Operation As shown in Figure 31, the EN pin has hysteresis built in. This prevents on/off oscillations that can occur due to noise on the EN pin as it passes through the threshold points. The EN pin active/inactive thresholds are derived from the IN voltage. Therefore, these thresholds vary when changing the input voltage. Figure 32 shows typical EN active/inactive thresholds when the input voltage varies from 2.5 V to 5.5 V. 1.4 0.5 2.50 5.50 VIN (V) 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 EN ACTIVE 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 EN INACTIVE HYSTERESIS Figure 32. Typical EN Pin Thresholds vs. Input Voltage |
Numéro de pièce similaire - ADP1707ARDZ-0.75R7 |
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Description similaire - ADP1707ARDZ-0.75R7 |
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