LT8310 100V Forward Converter IN Controller Fea T Descrip T n Input Voltage Range: 6V to 100V The LT 8310 is a simple-to-use resonant reset forward n Duty Mode Control Regulates an Isolated Output converter controller that drives the gate of a low side without an Opto N-channel MOSFET from an internally regulated 10V sup- n High Efficiency Synchronous Control ply. The LT8310 features duty mode control that generates n Short-Circuit (Hiccup Mode) Overcurrent Protection a stable, regulated, isolated output using a single power n Programmable OVLO and UVLO with Hysteresis transformer. With the addition of output voltage feedback, n Programmable Frequency (100kHz to 500kHz) via opto-coupler (isolated) or directly wired (nonisolated), n Synchronizable to an External Clock current mode regulation is activated, improving output n Positive or Negative Polarity Output Voltage Feedback accuracy and load response. The flexibility to choose with a Single FBX Pin transformer turns ratio makes high step-down or step-up n Programmable Soft-Start ratios possible without operating at duty cycle extremes. n Low Shutdown Current < 1A The user can program the switching frequency from 100kHz n Available in FE20 TSSOP with HV Pin Spacing to 500kHz to optimize efficiency, performance or external component size. A synchronous output is available for controlling secondary side synchronous rectification to a T improve efficiency. User programmable protection features n Industrial, Automotive and Military Systems include monitors on input voltage (UVLO and OVLO) and n 48V Telecommunication Isolated Power Supplies switch current (overcurrent limit). The LT8310 soft-start n Isolated and Nonisolated DC/DC Converters feature helps protect the transformer from flux saturation. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical a T 78 Watt Isolated Forward Converter, 8% V OUT 47H V OUT V IN 12V Output Voltage Load Regulation 36V TO 72V 2:1 2.2F 0.6A TO 6.5A 100V 1F 14.0 + 22F 4 86.6k 100V 100F 8 13.5 UVLO V IN 1.74k V 13.0 OUT 150pF OVLO NPO 12.5 LT8310 1.43k GATE 12.0 INTV SENSE CC 0.025 4.7F 11.5 102k 1% RDVIN GND 11.0 DFILT V = 72V 8310 TA01a IN 10nF NC SYNC SOUT NC V = 48V 10.5 IN RT SS V FBX C V = 36V IN 49.9k 10.0 0.47F 200kHz 1 2 4 5 6 7 NC 0 3 V IN I (A) OUT 8310 TA01b 8310f 1 For more information www.linear.com/LT8310 V (V) OUT ion pplica ions pplica ion uresLT8310 a Te Maxi Mu M r a T p c F T (Notes 1, 2) V , UVLO ...............................................................100V TOP VIEW IN INTV , RDVIN, SYNC ..............................................20V CC UVLO 1 20 NC DFILT...........................................................................8V V , OVLO, SS, RT ........................................................3V OVLO 3 18 V C IN FBX ................................................................. 3V to 3V DFILT 5 16 RDVIN SENSE ....................................................... 0.3V to 0.3V 21 GND RT 6 15 INTV CC GATE, SOUT ..........................................................Note 3 SYNC 7 14 GATE Operating Junction Temperature Range (Notes 4, 5) SS 8 13 SENSE LT8310E ............................................. 40C to 125C V 9 12 NC C LT8310I .............................................. 40C to 125C FBX 10 11 SOUT LT8310H ............................................ 40C to 150C FE PACKAGE LT8310MP ......................................... 55C to 150C 20-LEAD PLASTIC TSSOP Storage Temperature Range .................. 65C to 150C T = 125C (E-, I-GRADES), T = 150C (H-GRADE), JMAX JMAX = 10C/W, = 38C/W JC JA Lead Temperature Range (Soldering, 10 sec) ........300C EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO THE GROUND PLANE o r D i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT8310EFE PBF LT8310EFE TRPBF LT8310FE 20-Lead Plastic TSSOP 40C to 125C LT8310IFE PBF LT8310IFE TRPBF LT8310FE 20-Lead Plastic TSSOP 40C to 125C LT8310HFE PBF LT8310HFE TRPBF LT8310FE 20-Lead Plastic TSSOP 40C to 150C LT8310MPFE PBF LT8310MPFE TRPBF LT8310FE 20-Lead Plastic TSSOP 55C to 150C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on nonstandard lead based finish parts. For more information on lead free part marking, go to: