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AL17150-10B BUCK Design Tool
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Rev2.0 July 2, 2020
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Description: This design tool is used to design BUCK converter with AL17150-10B. In this tool document
The unit with GREEN color highlight is the electrical input parameter;
The unit with BLUE color highlight is the tool calculation result;
The unit with PINK color highlight is the judgement of parameters entered.
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ParametersSymbolValueUnitNote
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System Input & Output Setting
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AC InputVin_min85VAC Input Selected
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Vin_max265V
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Rated Output VoltageVO12.0 V
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Rated Output CurrentIO200mA
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Output PowerPo2W
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Efficiency@ full load &VC2_MINη80.0%
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Input CapacitorCin20μF
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Minimum Voltage on C2VC2_MIN111V
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Maximum Voltage on C2VC2_MAX375V
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Inductance L2 Calculation
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Minimum InductanceLmin651 μH
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Actual InductanceL21000μHOK
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Operating Mode@VC2_minDCM
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IL_pkIL_max427 mA
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IL_minIL_min0 mA
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Switching PeriodTs38.0 μS
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Switching FrequencyFsw26.3 kHz
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PWM OFF TimeToff33.7 μS
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PWM ON TimeTon4.3 μS
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Dead Timetd0.1 μS
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L2 discharge TimeToff133.6 μS
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BUCK Diode D3 Selection
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Reverse Recovery TimeTrr<75ns
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Peak Repetitive Reverse Voltage(Min)
Vrrm539 V
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AVG Diode CurrentID_AVG379 mA
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Output E-CAP C4 Design
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Target Output Ripple VoltageVripple80mV
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Minimum E-CAPC4_min421 μF
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Actual E-CAPC4570μFOK
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Feedback Resistor Design
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FB pin Low side ResistorR24.7 kΩ
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FB pin High side ResistorR118 kΩ
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Sample-Hold Cap (Max)C5_max1516 nF
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Sample-Hold Cap (Min)C5_min758 nF
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Actual Sample-Hold CapC51000nFOK
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VCC Supply Resistor R5 Design
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Max VCC Supply ResistorR510.0 kΩ
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Output Dummy Load Resistor R3 Design
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Output Dummy LoadIDummy1mA
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Max VCC Supply ResistorR312.0 kΩ
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