LT1071 Linear Technology, LT1071 Datasheet
LT1071
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LT1071 Summary of contents
Page 1
... This manual contains a comprehensive discussion of both the LT1070 and the external components used with it, as well as complete formulas for calculating the values of these components. The manual can also be used for the LT1071 by factoring in the lower switch current rating. A second Application Note, AN25, which details off-line applications is available. ...
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... LT1070/LT1071 ABSOLUTE MAXIMUM Supply Voltage LT1070/LT1071 (Note 2) .................................... 40V LT1070HV/LT1071HV (Note 2)........................... 60V Switch Output Voltage LT1070/LT1071 .................................................. 65V LT1070HV/LT1071HV......................................... 75V Feedback Pin Voltage (Transient, 1ms) ................ 15V U PACKAGE/ORDER INFORMATION BOTTOM VIEW CASE IS GND PACKAGE 4-LEAD TO-3 METAL CAN ...
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... Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Minimum switch “on” time for the LT1070/LT1071 in current limit This limits the maximum input voltage during short-circuit conditions, in the buck and inverting modes only , to 35V. Normal (unshorted) conditions are not affected. Mask changes are being implemented which will reduce minimum “ ...
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... INPUT VOLTAGE (V) 1070/71 G07 4 Maximum Duty Cycle –75 – 50 – 100 125 150 JUNCTION TEMPERATURE ( C) 1070/71 G02 Switch Saturation Voltage 1.6 FOR LT1071, DIVIDE CURRENT BY 2 1.4 150 C 1.2 100 C 1 0.8 – 0.6 0.4 0 SWITCH CURRENT (A) ...
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... V = 60V 7 SUPPLY –200 SUPPLY 5 –150 4 –100 3 – – –75 – TEMPERATURE ( C) LT1070/LT1071 Supply Current vs Supply Voltage (Shutdown Mode) 160 140 120 100 V = 50mV SUPPLY VOLTAGE (V) 1070/71 G11 ...
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... REF U OPERATION The LT1070/LT1071 is a current mode switcher. This means that switch duty cycle is directly controlled by switch current rather than by output voltage. Referring to the Block Diagram, the switch is turned “on” at the start of each oscillator cycle turned “off” when switch current reaches a predetermined level ...
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... V through a diode, placing the LT1070/LT1071 in an idle mode. Pulling the V regulator shutdown, with only 50 A supply current for shutdown circuitry biasing. See AN19 for full application details. (Note that maximum output currents are divided by 2 for the LT1071 ...
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... FILTER L3 – 20V 2 C5* 100 F * REQUIRED IF INPUT LEADS 2" ** PULSE ENGINEERING 92112 + GND – (Note that maximum output currents are divided by 2 for the LT1071) Negative Buck Converter D1 L1** 200 LT1070 100 F FB GND ...
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... GND V C OPTIONAL R3 INPUT 2.2k FILTER C1 0. – 12V * REQUIRED IF INPUT LEADS 2" ** PULSE ENGINEERING 92113 (Note that maximum output currents are divided by 2 for the LT1071) Positive Current Boosted Buck Converter 470 470 0. 0.002 LT1070 ...
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... IN FB GND 1000pF (Note that maximum output currents are divided by 2 for the LT1071) TOTAL INDUCTANCE = 4mH INTERLEAVE PRIMARY AND SECONDARY FOR + LOW LEAKAGE V IN INDUCTANCE 16V TO 24V V OUT 100V 300mA Negative Input/Negative Output Flyback Converter ...
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... 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. (Note that maximum output currents are divided by 2 for the LT1071) Flyback Converter L2 ...
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... High Efficiency Switching Regulators LT1374/LT1376 100kHz High Efficiency Switching Regulators Linear Technology Corporation 12 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear-tech.com (Note that maximum output currents are divided by 2 for the LT1071) Totally Isolated Converter D1 1 • ...