1-Applicable procedures for calculating power and distribution transformer ratios, 2-Applicable procedures for calculating power transformer efficiency, 3-Applicable procedures for calculating power transformer voltage regulation, 4-Special Cases In Transformers Sizing Calculations: Secondary Unit Substations. Download: Distribution Transformer Excel Spread Sheet Calculator. Description: Distribution Transformer Calculations – MS nput parameters: Primary rated voltage (kV.) Secondary rated voltage (kV.) Max. Demand load (kW) Power factor after correction; Transformer type; Permissible loading percentage (%).
Downloads
Supported products & hardware
Boost controllers (external switch)
LM3017—High Efficiency Low-Side Controller with True ShutdownLM3478—2.97~40V Wide Input Range Boost/SEPIC/Flyback DC-DC ControllerLM3478Q-Q1—40-V wide VIN low-side N-channel controller for switching regulators with 10-µA shutdown currentLM3481—2.97V to 48V High-Efficiency Controller for Boost, SEPIC and FlybackLM3481-Q1—2.97-V to 48-V high-efficiency controller for boost, SEPIC and flyback, AEC-Q100 qualifiedLM3488—2.97V to 40V Wide Vin Low-Side N-Channel Controller for Switching RegulatorsLM3488Q-Q1—40-V wide VIN low-side N-channel controller for switching regulators with 5-µA shutdown currentLM5020—13-100V Wide Vin, Current Mode PWM Boost, Flyback, Sepic ControllerLM5022—6-60V Wide Vin, current mode boost, SEPIC and Flyback controllerTPS40210-Q1—4.5-V to 52-V wide input range current mode boost controller with 700-mV reference voltageTPS40211-Q1—4.5-V to 52-V wide input range current mode boost controller with 260-mV reference voltageTransformer Design Calculation Excel Formula
Boost converters (integrated switch)
LM2577—3.5-V to 40-V, 3-A low component count step-up regulatorLM2585—4-V to 40-V, 3-A step-up wide VIN flyback regulatorLM2586—4-V to 40-V, 3-A step-up wide VIN flyback regulator with frequency synchronizationLM2587—4V to 40V, 5A Step-Up Wide Vin Flyback RegulatorLM2588—4-V to 40-V, 5-A step-up wide VIN flyback regulator with frequency synchronizationLM2621—1.2V to 14V input voltage, 1A load current, step-up DC-DCLM2623—0.8V to 14V input voltage, 2A load current, step-up DC-DCLM2623-Q1—0.8-V to 14-V input voltage, 2-A load current, step-up DC/DC, AEC-Q100 qualifiedLM2735—520kHz/1.6MHz space efficient boost and SEPIC DC-DC regulatorLM2735-Q1—520-kHz, 1.6-MHz space efficient boost and SEPIC DC/DC regulator, AEC-Q100 qualifiedLM3578A—2-V to 40-VIN switching regulators in buck, boost, terminal, depending upon the applicationLM5000—3.1-40V Wide Vin, 2A Current Mode Non-Synchronous Boost RegulatorLM5001—3.1-75V Wide Vin, 1A Current Mode Non-Synchronous Switch Mode RegulatorLM5001-Q1—3.1-V to 75-V wide VIN, 1-A current mode non-synchronous switch mode regulatorLM5002—3.1-75V Wide Vin, 0.5A Current Mode Boost, Flyback, Sepic ConverterTL1451—Dual Pulse-Width-Modulation Control CircuitTL1451A—3.6V to 50V dual channel controller with Wide input voltage rangeTL1451A-EP—Enhanced Product Dual Pulse-Width-Modulation Control CircuitsTL1451A-Q1—3.6-V to 50-V dual-channel PWM controller, AEC-Q100 qualifiedTL5001—PWM Controller with wide input range, with ±5% tolerance on reference, operation –20°C to 85°CTL5001A—PWM Controller with wide input range, with ±3% tolerance on reference, operation –20°C to 85°CTL5001A-Q1—PWM Controller with wide input range, with ±3% tolerance on reference, operation –20°C to 85°CTL5001M—PWM Controller with wide input range, with ±5% tolerance on reference, operation –55°C to 125°CTPS43000—Multi-Topology (buck, boost, sepic) High Frequency DC/DC ControllerTPS55340—5-A, 40-V, wide VIN boost, flyback, & SEPIC converterTPS55340-EP—Enhanced integrated, 5-A, 40-V wide input range boost/SEPIC/flyback DC/DC regulatorTPS55340-Q1—Integrated, 5-A 40-V wide input range boost/SEPIC/flyback DC/DC regulator, AEC-Q100 qualifiedTPS61175—3-A ,40V High Voltage Boost Converter with Soft-start and Programmable Switching FrequencyTPS61175-Q1—3-A, 40-V high voltage boost converter with soft-start and programmable switching frequencyUC2572—Negative output Flyback pulse width modulatorTransformer Design Calculation Excel Format
Buck converters (integrated switch)
LM5015—4.25-75V, Monolithic Two-Switch Forward DC-DC RegulatorTransformer Design Calculation Excel
Flybuck converters
LM25017—7.5-48V Wide Vin, 650mA Constant On-Time Synchronous Buck RegulatorLM25018—7.5-48V Wide Vin, 300mA Constant On-Time Synchronous Buck RegulatorLM25019—7.5-48V Wide Vin, 100mA Constant On-Time Synchronous Buck RegulatorLM34925—7.5-100V Wide Vin, 100mA Integrated Secondary Bias Regulator for Isolated DC/DC ConvertersLM34926—7.5-100V Wide Vin, 300mA Integrated Secondary Bias Regulator for Isolated DC/DC ConvertersLM34927—7.5-100V Wide Vin, 600mA Integrated Secondary Bias Regulator for Isolated DC/DC ConvertersLM5017—7.5-100V Wide Vin, 600mA Constant On-Time Synchronous Buck RegulatorLM5018—7.5-100V Wide Vin, 300mA Constant On-Time Synchronous Buck RegulatorLM5019—7.5-100V Wide Vin, 100mA Constant On-Time Synchronous Buck RegulatorLM5160—LM5160 wide input 65V, 2A synchronous buck/Fly-Buck™ converterLM5160-Q1—Wide Input 65V, 2A Synchronous Buck / Fly-Buck™ ConverterLM5160A—LM5160A Wide Input 65V, 2A Synchronous Buck / Fly-Buck™ ConverterLM5161—Wide Input 4.5-V to 100-V, 1-A Synchronous Buck / Fly-Buck ConverterTPS55010—2.95V To 6V Input, 2W, Isolated DC/DC Converter with Integrated FETSPWM controllers & resonant controllers
LM2524D—40V, 0.2A 550KHz PWM controllerLM3524D—40V, 0.2A 350KHz PWM controller