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LT1175IS8 Datasheet(PDF) 6 Page - Linear Technology |
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LT1175IS8 Datasheet(HTML) 6 Page - Linear Technology |
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6 / 18 page  LT1175 1175fe Typical perForMance characTerisTics GND Pin Current Ripple Rejection Shutdown Input Current Shutdown Thresholds SHDN Pin Characteristics INPUT VOLTAGE (V) 0 25 20 15 10 5 0 20 1175 G07 5 10 15 25 TJ = 125°C TJ = –55°C TJ = 25°C TEMPERATURE (°C) –50 2.5 2.0 1.5 1.0 0.5 0 0 50 25 75 1175 G08 –25 100 125 POSITIVE THRESHOLD NEGATIVE THRESHOLD DEVICE IS OFF BELOW THRESHOLD SHUTDOWN TO GROUND VOLTAGE (V) –25 –20 –10 0 15 10 5 0 –5 –10 15 1175 G09 –15 –5 10 20 5 25 VIN = 25V CHARACTERISTICS DO NOT CHANGE SIGNIFICANTLY WITH TEMPERATURE, SO A SINGLE CURVE IS SHOWN. POSITIVE CURRENT FLOWS INTO SHDN PIN IF SHDN PIN IS NEGATIVE WITH RESPECT TO INPUT VOLTAGE AND INPUT VOLTAGE IS LESS THAN 15V, NEGATIVE BREAKOVER POINT WILL BE ABOUT 8V BELOW –VIN OUTPUT CURRENT (A) 0 20 16 12 8 4 0 0.2 0.4 0.3 0.5 1175 G10 0.1 0.6 0.7 POWER TRANSISTOR IN DROPOUT TJ = –55°C TJ = 25°C VIN – VOUT ≥ 3V TJ = 25°C VIN – VOUT = 2V TJ = 25°C FREQUENCY (Hz) 100 80 60 40 20 0 10 1k 10k 1M 100 100k VOUT = 12V (ADJUSTABLE) IOUT = 100mA VIN – VOUT = 2V COUT = 1µF TANT 1175 G11 RIPPLE REJECTION IS RELATIVELY INDEPENDENT OF INPUT VOLTAGE AND LOAD FOR CURRENTS BETWEEN 25mA AND 500mA. LARGER OUTPUT CAPACITORS DO NOT IMPROVE REJECTION FOR FREQUENCIES BELOW 50kHz. AT VERY LIGHT LOADS, REJECTION WILL IMPROVE WITH LARGER OUTPUT CAPACITORS VOUT = 12V (ADJUSTABLE) WITH 0.1µF ACROSS DIVIDER RESISTOR VOUT = 5V (FIXED) |
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