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LM5026 Datasheet(PDF) 2 Page - National Semiconductor (TI) |
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LM5026 Datasheet(HTML) 2 Page - National Semiconductor (TI) |
2 / 23 page Connection Diagram 20147902 16-Lead TSSOP, LLP Ordering Information Order Number Package Type NSC Package Drawing Supplied As LM5026MT TSSOP-16 MTC16 92 Units per anti-static tube LM5026MTX TSSOP-16 MTC16 2500 Units on Tape and Reel LM5026SD LLP-16 SDA16A Available Soon LM5026SDX LLP-16 SDA16A Available Soon Pin Descriptions PIN NAME DESCRIPTION APPLICATION INFORMATION 1 VIN Input Voltage Source Input to the Start-up Regulator. Operating input range is 13V to 100V with transient capability to 105V. For power sources outside of this range, the LM5026 can be biased directly at VCC by an external regulator. 2 UVLO Line Under-Voltage Lockout An external voltage divider from the power source sets the shutdown and standby comparator levels. When UVLO reaches the 0.4V threshold the VCC and REF regulators are enabled. At the 1.25V threshold the SS pin is released and the device enters the active mode. 3 CS Current Sense input for current mode control and current limit If CS exceeds 0.5V the output pulse will be terminated, entering cycle-by-cycle current limit. An internal switch holds CS low for 100nS after OUT_A switches high to blank leading edge transients. 4 RES Restart Timer If cycle-by-cycle current limit is reached during any cycle, a 10uA current is sourced to the RES pin capacitor. If the RES capacitor voltage reaches 2.5V, the soft-start capacitor will be fully discharged and then released with a pull-up current of 1uA. After the first output pulse at OUT_A (when SS =1.4V), the SS pin charging current will revert back to 50 µA. 5 TIME Gate Drive Overlap or Deadtime Control An external resistor (RSET) sets either the overlap time or deadtime for the active clamp output. An RSET resistor connected between TIME and AGND produces in-phase OUT_A and OUT_B pulses with overlap. An RSET resistor connected between TIME and REF produces out-of-phase OUT_A and OUT_B pulses with deadtime. 6 REF Output of 5V Reference Maximum output current is 10mA. Locally decouple with a 0.1µF capacitor. 7 VCC Output of the high voltage start-up regulator. The VCC voltage is regulated to 7.6 V. If an auxiliary winding raises the voltage on this pin above the regulation setpoint, the internal start-up regulator will shutdown, thus reducing the IC power dissipation. www.national.com 2 |
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