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IQ65033QMA10ENS-G Datasheet(PDF) 11 Page - SynQor Worldwide Headquarters |
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IQ65033QMA10ENS-G Datasheet(HTML) 11 Page - SynQor Worldwide Headquarters |
11 / 15 page Input: Outputs: Current: Package: 36-75 V 5.0 V/ 3.3 V 10 A Quarter-brick Product # IQ65033QMA10 Phone 1-888-567-9596 www.synqor.com Doc.# 005-IQ5033S Rev. G 05/04/09 Page 11 Technical Specification EXTERNAL HOLD-UP CAPACITOR SELECTION CH is the hold-up capacitance (electrolytic capacitors typically have a ±20% tolerance): CH = 2tH PH Equation A V²H – V²U Typically a strong function of V H (see Figure D). The ATCA specification requirement is 8.70ms (see Figure E). Where: V H = hold-up capacitor charge voltage. V U = minimum operating voltage on the 48V output; the greater of the under-voltage lockout threshold of the payload power converter, and the under-voltage lockout threshold of the management power converter. t H = time from when the highest input feed voltage drops below VF , to the time when the highest input feed voltage rises above V U. VF = voltage at which the hold-up capacitor is engaged. P H = power drawn from the hold-up capacitor, the sum of the input power of the payload power converter, and the input power of the 3.3V mgmt power converter (see Figure 9): PH = POUT 12V + PIN 3.3V Equation B η 12V P OUT12V = output power delivered by the payload converter. η 12V = efficiency of the 12V payload converter. P IN.3.3V = 3.3V input management converter power. EXTERNAL HOLD-UP CAPACITOR VOLTAGE RATING Operating electrolytic capacitors near their voltage rating does not significantly affect their reliability, as it does with tantalum or ceramic type capacitors. The operating life of electrolytic capacitors is primarily determined by the capacitor internal temperature. The capacitor lifetime roughly doubles for every 10ºC reduction in internal temperature. SynQor recommends running 100V rated electrolytic capacitors at 90V, which dramatically increases hold-up time for a given capacitor volume (see Figure D). A built-in circuit automatically discharges the hold-up capacitor when the input voltage is removed. 0 5 10 15 20 300 400 500 600 700 800 900 1000 Hold-up Capacitance (µF) 90V 80V 70V PH=200W CF=100µF VI=-43V Figure D: Hold-up Time (ms) vs. Hold-up Capacitance (µF) at Hold-up Charge Voltages of 70V, 80V, and 90V (see Equation A). The AdvancedTCA hold-up time requirement is at most 8.70ms (solid horizontal line). The capacitor tolerance is not factored into this result. Error bars indicate the worst case range of hold-up time for a given hold-up capacitance. 36.0V 43.0V 41.0V 0 10 20 30 40 50 60 70 80 90 100 0 1 2 3 4 5 6 7 8 9 10 Time (ms) 8.70ms Figure E: The PICMG 3.0 R2.0 AdvancedTCA Base Specification requires continuous operation through a zero-volt transient, lasting 5ms (Section 4.1.2.2). However, this is not a square wave: the voltage starts at a minimum amplitude of -43V, falls at 50V/ms, remains at 0V for 5ms, and then rises at 12.5V/ms. At the worst case values of the hold-up connect threshold and the management power under-voltage lockout threshold, the required hold-up time is 8.70ms. |
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