DC/DC POWER CONVERSION TRANSFORMERS

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1 * Designed for use with Leading Controller Chips * Design Engineenring Support Available. * Provides DC/DC Conversion & Isolation * Multiple Configurations. GENERAL INFORMATION Premier Magnetics' Switch Mode Output transformers have been designed for use with the most popular currentmode switching regulators such as Linear Technologies LTXX & National Semiconductors LM2XX series of High Efficiency Switching Regulators. These output transformers have been optimized to provide maximum power throughput in the smallest packages currently available. This combination of components finds wide use in Distributed Power Systems where a main dc voltage bus is converted for use on or near the circuits being served. These types of switching regulators provide a very simple solution to power conversion designs. The inductor or transformer used are critical to the overall performance of the converter and typically define the overall efficiency, output power and physical size. The following tables of transformers were designed for use in the Flyback Buck-Boost circuit configuration. This conversion topology allows the output voltage to be regulated higher or lower than the input voltage. It can also provide isolated or non-isolated multiple outputs. Typical efficiency of this topology is %. Below is a typical application circuit utilizing Linear Technologies LTXX switching regulator in the flyback buckboost configuration. The use of Premiers VTP-0XXX or VTK-0XXX optional output filter choke will drastically reduce output ripple and noise. The component values listed are intended for reference purposes only. The Output Filter(s), Damper Network & Foldback Current Limiting Network are optional depending on the specific application. General Component Values: R3 =.0K /W D = MBRXXX, Schottky Rectifier C3 = 2.2uF Film D2 = MBRXXX, Schottky Rectifier R =.K W Snubber D3 = MBRXXX, Schottky Rectifier C =.uf Film C = Electrolytic R = 2.0K W C = Electrolytic C = 0.uF Ceramic R = % Metal Film as needed. L = Rated DC amps (VTP-XXXX) C = 000uF Electrolytic L2 = Rated DC amps (VTP-XXXX) C = 000uF Electrolytic Np:Ns2 R = % Metal Film, For = 3.0K, For 9 = 9.09K R = [Vout-Vref/Vref] * R2, where Vref =.2 for LTXX series R2 = % Metal Film, For =.0K, For 9 =.K C2 = Input Bypass Capacitor 00uF Electrolytic FLYBACK Buck-Boost CONVERTER USING LTXX D3 C FILTER L2 + + C SCHEMATIC +Vout2 Isolated Output -Vout2 +Vin RC Snubber R C Damper R T D C FILTER L + + C +Vout C2 + Vin Linear Technology Vsw LT-X0 = A LT-X = 2.A LT-X2 =.2A LT-0X = 0KHz LT-X = 00KHz * * FB E E2 Vc D2 C Np:Ns N9 R R Foldback Current Limiting R3 C3 Frequency Compensation R2 pmsm /9 203 BARENTS SEA CIRCLE, LAKE FOREST, CA 9230 TEL: (99) 2-0 FAX: (99)

2 GENERAL ELECTRICAL SPECIFICATIONS AT 2 O C - OPERATING TEMPERATURE RANGE 0 O C TO +0 O C PM-SM02 LT Feed Back Output THRU PM-SM03 LT Feed Back Output THRU PM-SM0 LT Feed Back Output THRU PM-SM0 LT Feed Back Output THRU PM-SM0 LT Feed Back Output THRU PM-SM09 LT Feed Back Output THRU TSD- LT Feed Back Output THRU Output # Isolated Output TSD- LT Isolated Output # THRU Output # Isolated Output #2 Output #3 = Tap off # Tap Output off #2 TSD- LT Isolated Output, Opto F.B. SMD Outputs #2 & #3: Isolated + Linear Reg. TSD-9 LT0HV N/A Positive Buck SMD TSD-2 MAX Positive Buck SMD Output #2 = Auxiliary Auxiliary Output TSD-23 LT Isolated Output THRU TSD-2 LT Feed Back Output SMD 3V TAP Output Tap Output V TAP Output Tap Output TSD-2 LT Feed Back Output SMD Output #2, 3V TAP Tap Output Output #3, V TAP Tap Output TSD-2 LT Isolated Output THRU TSD-30 LT Isolated Output SMD Output #2 & #3: +V Isolated Output (TSD-933 = THRU VERSION) DISCRETE SELF OSCILLATING PUSH-PULL CONVERTERS, DUAL SECONDARIES TSD-3 0KHz Full Wave C.T Isolated Output THRU Full Brige Isolated Output Dual Full Brige Isolated Output TSD- 0KHz Full Wave C.T Isolated Output THRU Full Brige Isolated Output Dual Full Brige Isolated Output TSD- 0KHz Full Wave C.T Isolated Output THRU Full Brige Isolated Output Dual Full Brige Isolated Output TSD-2.0KHz DC to AC.-3. rms rms 3mH 00 0 Isolated rms Output SMD pmsm /9 203 BARENTS SEA CIRCLE, LAKE FOREST, CA 9230 TEL: (99) 2-0 FAX: (99)

3 GENERAL ELECTRICAL SPECIFICATIONS AT 2 O C - OPERATING TEMPERATURE RANGE 0 O C TO +0 O C TSD-0 LT Isolated Output SMD Output # Isolated Output TSD-9 LT Isolated Output THRU Output # Isolated Output Output #3 = Auxiliary Isolated Output TSD-2 LT Feed back Output SMD Output # Second Output Outputs #3 & #: +V Isolated Outputs +V TSD-3 UC Isolated Output, Opto F.B. THRU Output # Isolated Output TSD-39 LT Isolated Output, Opto F.B. SMD Output #2 & #3: Isolated Output Output # & #: Isolated Output TSD- LT00-30V Isolated Output, Opto F.B. THRU Output # Isolated Output TSD-9 UC Isolated Output, Opto F.B. SMD 3.3V TAP Output Tap Output Output # Isolated Output TSD-0 UC Isolated Output, Opto F.B. SMD Output # Isolated Output -2V TAP Output off # Tap Output TSD- UC Isolated Output, Opto F.B. THRU -2V TAP Output Tap Output TSD-2 UC Isolated Output, Opto F.B. THRU Output # Isolated Output TSD- LT Isolated Output, Opto F.B. THRU Output # Isolated Output TSD-9 LT Isolated Output, Opto F.B. SMD TSD- LT Direct Feedback THRU TSD-90 LM2T Isolated Output, Opto F.B. THRU Output #2 WITH REG'S Iso. Linear Reg Output TSD-93 LT Isolated Output, Opto F.B. THRU TSD-933 LT Isolated Output THRU Output #2 & # Isolated Output TSD-90 LT Isolated Output THRU Output # Isolated Output TSD-99 LT Direct Feedback Output SMD Output #2 & # Isolated Output TSD-00 LT Direct Feedback Output SMD Output # Isolated Output # Output # Isolated Output #2 pmsm /9 203 BARENTS SEA CIRCLE, LAKE FOREST, CA 9230 TEL: (99) 2-0 FAX: (99)

4 GENERAL ELECTRICAL SPECIFICATIONS AT 2 O C - OPERATING TEMPERATURE RANGE 0 O C TO +0 O C TSD- LM Direct Feedback SMD pmsm /9 203 BARENTS SEA CIRCLE, LAKE FOREST, CA 9230 TEL: (99) 2-0 FAX: (99)

5 YYWW DC/DC * Designed to Support Maxim's MAX23 * Low profile -Pin SMD Package * 00Vrms Minimum Isolation Voltage * Industry Standard Package * >2KHz, 0% Duty Cycle * Multiple Configurations Push-Pull Watt Output ELECTRICAL SPECIFICATIONS AT 2 O C - OPERATING TEMPERATURE RANGE -0 O C TO + O C TURNS RATIO (Pri:Sec ± %) OCL ( H ) Primary Pins TYPICAL PRI/SEC (Vr ms) GENERAL CHARACTERISTICS PM-SM CT : V to +0V 00 Volt Doubler Driving a Regulator PM-SM CT :.3CT 0 - +V to +V 00 Full Wave Center Tap PM-SM CT : 2.00CT V to +V 00 Full Wave Center Tap PM-SM CT : V to +V 00 Full Wave Bridge PM-SM9 CT :. CT 0-00 Full Wave Center Tap MECHANICALS TYPICAL S x.0 (.00) 0. (.39) x.0 (.00) RECOMMENDED P.C.B. LAYOUT Dimensions in mm (inches) 3x2.0 (.09) 0.uF +V Vcc D MAX23 D2 VOLTAGE DOUBLER PM-SM CT : MBR020L 2 3 MBR020L REGULATED 200mA L0 PIN# I.D. DOT.00 (.23) (.2) MAX P M PM-SMXX.0 (.39) 0. (.39). (.) 2.0 (.2) CORE CLAMP 0.0 (.02) 0. (.2) 2.0 (.09) TYP MAX 0.uF 0.uF 0.uF +V Vcc D MAX V +V D2 Vcc D MAX23 D2 Vcc D MAX23 D2 FULL WAVE CENTER TAP PM-SM CT :.3CT PM-SM CT : 0. FULL WAVE BRIDGE MBR020L MBR020L FULL WAVE CENTER TAP PM-SM CT : 2.0CT 2 3 MBR020L MBR020L 200mA 00mA 200mA pmsm /9 203 BARENTS SEA CIRCLE, LAKE FOREST, CA 9230 TEL: (99) 2-0 FAX: (99)