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LT1029ACZ Datasheet(PDF) 3 Page - Linear Technology |
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LT1029ACZ Datasheet(HTML) 3 Page - Linear Technology |
3 / 4 page 3 LT1029/LT1029A 1029afa Reverse Characteristics APPLICATIO S I FOR ATIO Output Trimming Output voltage trimming on the LT1029 is nominally accomplished with a potentiometer connected from output to ground with the wiper tied to the trim pin. The LT1029 was made compatible with existing references, so the trim range is large; 5%, – 13%. This large trim range makes precision trimming rather difficult. One solution is to insert resistors in series with both ends of the potentiometer. This has the disadvantage of potentially poor tracking between the fixed resistors and the potentiometer. A second method of reducing trim range is to insert a resistor in series with the wiper of the potentiometer. This works well only for a very small trim range because of the mismatch in TCs between the series resistor and the internal thin film resistors. These film resistors can have a TC as high as 500ppm/°C. That same TC is then transferred to the change in output voltage; a 1% shift in output voltage causes a (500ppm) (1%) = 5ppm/°C change in output voltage drift. The worst case error in initial output voltage for the LT1029A is 0.2% and the LT1029 is 1%, so a series resistor is satisfactory if the output is simply trimmed to nominal value. 1ppm/°C TC shift would be the maximum expected for the LT1029A and 5ppm/°C for the LT1029. Shunt Capacitance The LT1029 is stable with all values of shunt capacitance, but values between 300pF and 0.01µF are not recom- mended because they cause longer settling following a TYPICAL PERFOR A CE CHARACTERISTICS OUTPUT TO GROUND VOLTAGE (V) 0 0 0.1 0.3 0.4 0.5 1.0 0.7 2 4 5 0.2 0.8 0.9 0.6 13 6 7 8 TJ = – 55°C LT1029 • TPC01 TJ = 25°C TJ = 125°C Wide Trim Range (5%, – 13%) Narrow Trim Range transient in operating current. A 1µF solid tantalum capacitor is suggested for most situations where bypassing is desirable. Trimming Output to 5.120V Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. V+ 25k VREF I ≥ 900µA LT1029 • AI01 TRIM RANGE 0.4% – LT1029A, R1 = 750k 1.2% – LT1029, R1 = 250k LT1029 • TA02 V+ 100k VREF = 5.000V I ≥ 800µA R1* V+ R1 41.2k R2 5k R3 4.02k VREF = 5.120V I ≥ 800µA LT1029 • AI03 |
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