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LT1082 Datasheet(PDF) 1 Page - Linear Technology |
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LT1082 Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page 1 LT1082 1A High Voltage, Efficiency Switching Voltage Regulator LT1082C LT1072HV VIN 3V to 75V 3V to 60V VSW 100V 75V Switch Current Limit 1A 1.25A Quiescent Current 4.5mA 6mA Operating Frequency 60kHz 40kHz Flyback Reference Voltage 16.2 + 0.6 (35k Ω/RFB) 16 + 0.35 (7kΩ/RFB) LT1082 and LT1072 Major Specification Differences USER NOTE: This data sheet is only intended to provide specifications, graphs, and a general functional description of the LT1082. Application circuits are included to show the capability of the LT1082. A complete design manual (AN19) and Switcher CAD (LTC Switching Power Supply Design Program) should be obtained to assist in developing new designs. 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 LT1082 by factoring in the lower switch current rating. s Telecom 5V Supply at 0.7A from –48V s 90V Supply at 120mA from 15V s All Applications Using LT1072 (See Below for Specification Differences) S APPLICATI S FEATURE s Wide Input Voltage Range: 3V to 75V s High Switch Voltage: 100V s Low Quiescent Current: 4.5mA s Internal 1A Switch s Shutdown Mode Draws Only 120 µA Supply Current s Isolated Flyback Regulation Mode for Fully Floating Outputs s Can Be Externally Synchronized s Available in MiniDIP and TO-220 Packages s Same Pinout as LT1072 The LT1082 is a monolithic high voltage switching regulator. It can be operated in all standard switching configurations including buck, boost, flyback, forward, and inverting. A 1A high efficiency switch is included on the die along with all oscillator, control, and protection circuitry. The LT1082 operates with supply voltages from 3V to 75V, switch voltage up to 100V and draws only 4.5mA quies- cent current. It can deliver load power up to 20W with no external power devices. By utilizing current-mode switch- ing techniques, it provides excellent AC and DC load and line regulation. An externally activated shutdown mode reduces total supply current to 120 µA typical for standby operation. Totally isolated and regulated outputs can be generated by using the optional “isolated flyback regulation mode” built into the LT1082, without the need for optocouplers or extra transformer windings. The LT1082 has a unique feature to provide high voltage short-circuit protection. When the FB pin is pulled down to 0.6V and the current out of the pin reaches approximately 350 µA, the switching frequency will shift down from 60kHz to 12kHz. The LT1082 is nearly identical to the lower voltage LT1072. For the major differences in specifications, see the table on the left. DESCRIPTIO Negative-to-Positive Telecom 5V Supply INPUT VOLTAGE (V) 0 –20 –40 –50 –90 1082 TA02 –10 –30 –60 –70 –80 1.0 0.9 0.8 0.7 0.6 0.5 0.4 L=550 µH L=450 µH L=350 µH L=250 µH L=150 µH L=100 µH f = 45kHz ISW LIMIT = 1.07A Telecom 5V Supply Maximum Output Current vs Input Voltage + VIN VSW GND FB VC LT1082 4.7k 0.22 µF 33 µF 80V CHEMI-CON SXE SERIES –20V TO –70V **250 µH 3.83k + 0.01 µF 1.1k Q1 2N5401 470 µF 10V CHEMI-CON SXE SERIES VOUT 5V, 0.7A *D1 MOTOROLA MUR110 (100V, 1A) 69 TURNS OF #28 AWG WIRE ON A MICROMETALS T60 TYPE 52 CORE. NOTE: THIS CORE IS LOW COST, BUT HAS HIGHER CORE LOSS AND IS LARGER THAN NECESSARY FOR LOWER CURRENT APPLICATIONS. FOR SMALLER INDUCTORS OR HIGHER EFFICIENCY, USE A LOW LOSS CORE SUCH AS MAGNETICS INC. KOOL M µ OR MOLYPERMALLOY. * ** 1082 TA01 NOTE: MAXIMUM OUTPUT CURRENT IS A FUNCTION OF INPUT VOLTAGE. SEE THE GRAPH ON THE RIGHT. |
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