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LM138K 데이터시트(PDF) 5 Page - Linear Technology |
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LM138K 데이터시트(HTML) 5 Page - Linear Technology |
5 / 12 page 5 LT138A/LT338A LM138/LM338 TYPICAL PERFOR A CE CHARACTERISTICS Current Limit Current Limit Current Limit INPUT-OUTPUT DIFFERENTIAL (V) 0 8 12 40 138A/338A G10 4 0 10 20 30 16 PEAK CURRENT LIMIT DC CURRENT LIMIT TCASE = 25°C PRELOAD = 0A PRELOAD = 1A PRELOAD = 5A TIME (ms) 0.1 8 10 12 14 1 10 100 138A/338A G11 6 4 2 0 PRELOAD = 0A PRELOAD = 5A VIN = 10V VOUT = 5V TCASE = 25°C TIME (ms) 0.1 8 10 12 14 1 10 100 138A/338A G12 6 4 2 0 PRELOAD CURRENT = 0 TCASE = 25°C VIN – VOUT = 10V VIN – VOUT = 15V VIN – VOUT = 20V VIN – VOUT = 30V Line Transient Response TIME ( µs) 0 0 0.5 –1.5 –1.0 – 0.5 20 30 1.5 138A/338A G13 1.0 10 40 0 0.5 1.0 CL = 1µF CL = 10µF COUT = 0 CADJ = 0 VOUT = 10V IOUT = 50mA TJ = 25°C Load Transient Response TIME ( µs) 0 2 6 –3 –2 3 0 20 40 138A/338A G14 4 1 2 –1 010 30 VIN = 15V VOUT = 10V TCASE = 25°C PRELOAD = 100mA CL = 1µF CADJ = 10µF CL = 0 CADJ = 0 APPLICATIONS INFORMATION General The LT138A develops a 1.25V reference voltage between the output and the adjustable terminal (see Figure 1). By placing a resistor, R1, between these two terminals, a con- stant current is caused to flow through R1 and down through R2 to set the overall output voltage. Normally this current is the specified minimum load current of 5mA or 10mA. Because IADJ is very small and constant when compared with the current through R1, it represents a small error and can usually be ignored. It is easily seen from the output voltage equation, that even if the resistors were of exact value, the accuracy of the output is limited by the accuracy of VREF. Earlier adjustable regulators had a reference tolerance of ±4% which is dangerously close to the ±5% supply tolerance required in many logic and analog sys- tems. Further, even 1% resistors can drift 0.01%/ °C, add- ing additional error to the output voltage tolerance. Figure 1. Basic Adjustable Regulator LT338A VIN R1 138A/338A F01 VOUT IADJ 50 µA ADJ VREF VOUT VIN R2 VOUT = VREF R2 R1 1 + + IADJ • R2 () + |
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