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LR645 Dataheets PDF



Part Number LR645
Manufacturers Supertex Inc
Logo Supertex  Inc
Description High Input Voltage SMPS Start-up / Linear Regulator
Datasheet LR645 DatasheetLR645 Datasheet (PDF)

LR645 High Input Voltage SMPS Start-up / Linear Regulator Ordering Information Order Number / Package Max. Input Voltage 450V TO-92 LR645N3 TO-243AA* LR645N8 TO-220 SO-8 Die Product marking for TO-243AA: LR6❋ where ❋ = 2-week alpha date code LR645N5 LR645LG LR645ND *Same as SOT-89. Product supplied on 2000 piece carrier tape reels. Features ❏ Accepts inputs from 15V to 450V ❏ Compatible with industry standard PWM ICs. See application note AN-H28. ❏ Output currents up to 3mA continuous, 30mA p.

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LR645 High Input Voltage SMPS Start-up / Linear Regulator Ordering Information Order Number / Package Max. Input Voltage 450V TO-92 LR645N3 TO-243AA* LR645N8 TO-220 SO-8 Die Product marking for TO-243AA: LR6❋ where ❋ = 2-week alpha date code LR645N5 LR645LG LR645ND *Same as SOT-89. Product supplied on 2000 piece carrier tape reels. Features ❏ Accepts inputs from 15V to 450V ❏ Compatible with industry standard PWM ICs. See application note AN-H28. ❏ Output currents up to 3mA continuous, 30mA peak ❏ Supply current typically 50µA ❏ Line regulation typically 0.1mV/V ❏ Output can be trimmed from 8.0V to 12V ❏ Output current can be increased to 150mA with external FET General Description The Supertex LR6 is a high input voltage, low output current linear regulator. It has a 3-terminal fixed output voltage version available in TO-92, TO-220 and SOT-89 packages as well as an adjustable voltage version available in 8 pin SOIC package. The 3-terminal version functions like any other low voltage 3-terminal regulator except it allows the use of much higher input voltages. When used in a SMPS start-up circuit, it eliminates the need for large power resistors. In this application, current is drawn from the high voltage line only during start-up. Only leakage current flows after start-up thereby reducing the continuous power dissipation to a few milliwatts. The adjustable voltage version allows trimming of the output voltage from 8V to 12V. This version can also be connected to an external depletion mode MOSFET for increased output current. When used in conjunction with Supertex depletion mode MOSFET DN2540N5, up to a 150mA is achieved. Applications ❏ Off-line SMPS startup circuits (pulse loads) ❏ Low power off-line regulators ❏ Regulators for noisy inputs (continued on page 14-3) Caution The LR6 does NOT provide galvanic isolation. When operated from an AC line, potentially lethal voltages can be present on the IC. Adequate means of protecting the end user from such voltages must be provided by the circuit developer. Pin Configuration TAB 1 2 3 TAB TO-243AA (SOT-89) 123 Absolute Maximum Ratings Input Voltage Output Voltage Operating and Storage Temperature Soldering Temperature* *Distance of 1.6mm from case for 10 seconds TO-92 450V 15.5V 5 1 2 3 4 1 2 3 SO-8 +VIN TO-92 TO-243AA 1 1 1 1 GND 2 2, TAB 2, TAB 3 VOUT 3 3 3 4 Trim — — — 5 TO-220 Gate — — — 7 –55°C to +150°C 300°C For detailed circuit and application information, please refer to application note AN-H28. 11/12/01 TO-220 P-DIP Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to workmanship. No responsibility is assumed for possible omissi.


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