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REC20-243.4SZ Datasheet(PDF) 2 Page - Recom International Power |
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REC20-243.4SZ Datasheet(HTML) 2 Page - Recom International Power |
2 / 6 page DC/DC Converter ECO-2 REV.: 2/2017 www.recom-power.com REC20-Z Series BASIC CHARACTERISTICS Parameter Condition Min. Typ. Max. Input Voltage Range nom. Vin= 24V nom. Vin= 48V 9VDC 18VDC 36VDC 75VDC Start/up Time 10ms Under Voltage Lockout nom. Vin= 24V DC-DC ON DC-DC OFF 9VDC 7.5VDC nom. Vin= 48V DC-DC ON DC-DC OFF 18VDC 16VDC Output Voltage Trimming see calculation below ±10% Remote ON/OFF DC-DC ON DC-DC OFF Open or 2.5V<Vr<12V Short or 0V<Vr<1.2V Operating Frequency 300kHz Minimum Load 0% Output Ripple and Noise (1) 100mVp-p continued on next page Specifications (measured @ ta= 25°C, nominal input voltage, full load and after warm up unless otherwise specified) Notes: Note1: Ripple and Noise is measured with a 20MHz bandwidth and a 0.1µF ceramic capacitor. Output Voltage Trimming Trim Calculation Trim UP Trim DOWN Vref +Vout Trim R1 Rup R3 R2 Vref -Vout Trim R1 Rdown R3 R2 Vref +Vout Trim R1 Rup R3 R2 Vref -Vout Trim R1 Rdown R3 R2 Vout 3.4V 5.1V 12V 15V R1 4.71 k Ω 2.3 k Ω 19.43 k Ω 25.6 kΩ R2 2.7 k Ω 2.2 k Ω 5.1 k Ω R3 15 k Ω 9.1 k Ω 36 k Ω Vref 1.24 V 2.5 V Rup = q a*R2 r-R3=kΩ DVout = Output Voltage Trim R2 - a Rup = trim up resistor Rdown = trim down resistor Rdown = q b*R1 r- R3=kΩ a = trim up factor R1 - b b = trim down factor a = q Vref r*R1=kΩ DVout - Vref b = qDVout -Vrefr*R2=kΩ Vref Practical Example: a = q 2.5V r*2.3kΩ=1.849kΩ 5.61V - 2.5V Rup = q 1.849kΩ*2.2kΩ r-9.1= 3.411kΩ 2.2kΩ - 1.849kΩ Trim Up: Vout = 5.1V, DVout = 10% (5.61V), Vref= 2.5V Trim down: Vout = 5.1V, DVout = -10% (4.59V), Vref= 2.5V b = q4.59V -2.5Vr*2.2kΩ= 1.839kΩ 2.5V Rdown = q1.839kΩ*2.3kΩr- 9.1kΩ=0.075kΩ 2.3k Ω - 1.839kΩ |
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