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LT3804 Datasheet(PDF) 1 Page - Linear Technology |
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LT3804 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page LT3804 1 3804i 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. Final Electrical Specifications s Regulates Two Secondary Outputs s Optocoupler Feedback Driver and Second Output Synchronous Driver Controller s True Differential Remote Sensing Regulation s High Switching Frequency: up to 800kHz s Programmable Current Limit s Programmable Soft-Start and Power Good s Automatic Frequency Synchronization s Available in Thermally Enhanced 28-Lead TSSOP APPLICATIO S FEATURES DESCRIPTIO TYPICAL APPLICATIO The LT ®3804 is a high efficiency step-down switching regulator with optocoupler feedback control for regulating multiple outputs in single-secondary winding isolated power supplies. The LT3804 contains an error amplifier and an optocoupler driver to regulate the first (main) output. For the second output regulation, the LT3804 contains a complete PWM controller to drive dual synchronous N-channel MOSFETs. With leading edge modulation, it operates with either current or voltage mode control of the primary side. The LT3804 is synchronized to the falling edge of the trans- former secondary winding and can be used in single- ended or double-ended isolated power converter topolo- gies. A user selectable discontinuous conduction mode improves light load efficiency. True differential Kelvin sensing is used for each output feedback amplifier to achieve high regulation accuracy and design simplicity. Other features include soft start, current limit and power good flags. , LTC and LT are registered trademarks of Linear Technology Corporation. s 48V Input Isolated DC/DC Converters s Multiple Output Power Supplies s Offline Converters s DC/DC Power Modules Secondary Side Dual Output Controller with Opto Driver June 2003 IN2 IN1 OUT2 OUT1 VCC BIAS VOUT1 3.3V AT 15A BG SG LT3781 ISOLATION BOUNDARY COUT1, COUT2: SANYO POSCAP 4TPE680MF 680µF/4V L1, L2: SUMIDA CEP125-IR8MC-H Q1-Q4: SILICONIX Si7892DP VIN 36V TO 72V VREF VC VFB TG • • Q1 Q2 L2 1.8 µH 0.003 Ω • • – + VOUT2 1.8V AT 15A • • COUT1 + LTC1693-1 CL1N CL1P VCC CSET GNDS1 VFB1 VAOUT1 OPTO SYNC TGATE SW BGATE PGND CL2N VFB2 Q4 x2 x2 Q3 CL2P VAOUT2 GNDS2 COUT2 + L1 1.8 µH VOS1+ VOS1– VOS1+ VOS1– 1.5k 3.01k 604 Ω LT3804 2.74k 390pF 3804 F01 0.003 Ω Figure 1. 250kHz, 3.3V and 1.8V Output Isolated DC/DC Converter (Simplified Schematic) |
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