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TS6001 bảng dữ liệu(PDF) 8 Page - Silicon Laboratories |
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TS6001 bảng dữ liệu(HTML) 8 Page - Silicon Laboratories |
8 / 13 page TS6001 Page 8 TS6001 Rev. 1.0 Supply Current The TS6001 exhibits excellent dc line regulation as its supply current changes slightly as a function of the applied supply voltage. Because of a unique bias loop design, the change in its supply current as a function of supply voltage (its ∆IIN/∆VIN) is less than 0.1 μA/V. Since the TS6001 is a series-mode reference, load current is drawn from the supply voltage only when required. In this case, circuit efficiency is maintained at all applied supply voltages. Reducing power dissipation and extending battery life are the net benefits of improved circuit efficiency. When the applied supply voltage is less than the minimum specified input voltage of the TS6001 (for example, during the power-up or “cold-start” transition), the TS6001 performs an internal calibration routine and can draw up to 200 μA above its nominal, steady-state supply current. This internal calibration sequence also dominates the TS6001’s turn-on time. To ensure reliable power-up behavior, the input power source must have sufficient reserve power to provide the extra supply current drawn during the power-up transition. Voltage Reference Turn-On Time With a (VIN – VOUT) voltage differential larger than 200mV and ILOAD = 0mA, the TS6001’s typical combined turn-on and settling time to within 0.1% of its 2.5V final value is approximately 340 μs. Output Voltage Hysteresis Reference output voltage thermal hysteresis is the change in the reference’s +25°C output voltage after temperature cycling from +25°C to +85°C to +25°C and from +25°C to -40°C to +25°C. Thermal hysteresis is caused by differential package stress impressed upon the TS6001’s internal bandgap core transistors and depends on whether the reference IC was previously at a higher or lower temperature. At 100ppm, the TS6001’s typical temperature hysteresis is equal to 0.25mV with respect to a 2.5V output voltage. Connecting Two or More TS6001s in Stacked VOUT Arrangements In many applications, it is desired to combine the outputs of two or more precision voltage references, especially if the combined output voltage is not available or is an uncommon output voltage. One such technique for combining (or “stacking”) the outputs of precision voltage references is illustrated in Figure 3. In this example and powered by an unregulated supply voltage (VIN ≥ +5.2V), two TS6001-2.5 precision voltage references are used. The GND terminal of REFA is connected to the OUT terminal of REFB. This connection produces two output voltages, VREFOUT1 and VREFOUT2, where VREFOUT1 is the terminal voltage of REFB and VREFOUT2 is VREFOUT1 plus the OUT terminal voltage of REFB. By implementing this stacked arrangement with a pair of TS6001-2.5s, VREFOUT2 is 5V and VREFOUT1 is 2.5V. Although the TS6001-2.5s do not specifically require input bypass capacitors, it is good engineering practice to bypass both references from VIN to the global GND terminal (at REFB). If either or both reference ICs are required to drive a load capacitance, it is also good engineering practice to route the load capacitor’s return lead to each reference’s corresponding REF’s GND terminal. The circuit’s minimum input supply voltage, VIN, is determined by VREFOUT2 and REFB’s dropout voltage (75mV, typically). How to Configure the TS6001 into a General- Purpose Current Source In many low-voltage applications, a general-purpose current source is needed with very good line regulation. The TS6001-2.5 can be configured as a grounded-load, floating current source as shown Figure 4. In this example, the TS6001-2.5’s output voltage is bootstrapped across an external resistor (R1 + P1) which, in turn, sets the output current. The circuit’s total output current is IOUT = ISET+IQSC where IQSC is the TS6001 supply current (up to 35µA). For Figure 3: Connecting Two TS6001-2.5s in a Stacked VREFOUT Arrangement |
Số phần tương tự - TS6001 |
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Mô tả tương tự - TS6001 |
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