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ISL21007DFB812Z Arkusz danych(PDF) 11 Page - Intersil Corporation |
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ISL21007DFB812Z Arkusz danych(HTML) 11 Page - Intersil Corporation |
11 / 14 page 11 FN6326.1 April 12, 2007 0.01µF value can be increased for better load transient response with little sacrifice in output stability. Turn-On Time The ISL21007 devices have low supply current and thus the time to bias up internal circuitry to final values will be longer than with higher power references. Normal turn-on time is typically 120µs. This is shown in Figure 10. Circuit design must take this into account when looking at power up delays or sequencing. Temperature Coefficient The limits stated for temperature coefficient (tempco) are governed by the method of measurement. The overwhelming standard for specifying the temperature drift of a reference is to measure the reference voltage at two temperatures, take the total variation, (VHIGH – VLOW), and divide by the temperature extremes of measurement (THIGH –TLOW). The result is divided by the nominal reference voltage (at T = +25°C) and multiplied by 106 to yield ppm/°C. This is the “Box” method for specifying temperature coefficient. Output Voltage Adjustment The output voltage can be adjusted up or down by 2.5% by placing a potentiometer from Vout to ground, and connecting the wiper to the TRIM pin. The TRIM input is high impedance, so no series resistance is needed. The resistor in the potentiometer should be a low tempco (<50ppm/°C) and the resulting voltage divider should have very low tempco <5ppm/°C. A digital potentiometer such as the ISL95810 provides a low tempco resistance and excellent resistor and tempco matching for trim applications. VIN = 3.0V VIN VO GND ISL21007 0.01µF 10µF 2k Ω 0.1µF 10µF FIGURE 28. HANDLING HIGH LOAD CAPACITANCE ISL21007 |
Podobny numer części - ISL21007DFB812Z |
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Podobny opis - ISL21007DFB812Z |
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