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## HA17384SPS Datasheet(PDF) 23 Page - Hitachi Semiconductor

 Part No. HA17384SPS Description High Speed Current Mode PWM Control IC for Switching Power Supply Download 31 Pages Scroll/Zoom 100% Maker HITACHI [Hitachi Semiconductor] Homepage http://www.renesas.com/eng Logo

## HA17384SPS Datasheet(HTML) 23 Page - Hitachi Semiconductor

 23 / 31 page HA17384SPS/SRP, HA17384HPS/HRP, HA17385HPS/HRP23Triangular wavePWM maximumON pulseDumax is the ratio ofmaximum ON time ofPWM to one cycle time.In the above case,Dumax = 95%•Calculation of operation parameters1. Maximum ON duty Du max (Refer to the right figure.)Du max =11 + 1.78× In 1 +190ΩRT − 440Ω()RT =+ 440Ω190Ω0.56 (1/Du max− 1)CT = 1.78 ×Du maxfosc× RTIDmax =VTHCSfosc =1CT × RT ×0.56 + In 1 +190Ω(){}2. Oscillation frequency foscFrom the above two equations, the following two equations areobtained.3. Equalization to device RT from Du maxe(e = 2.71828.base of natural logarithm)4. Equation to device CT from fosc and RT5. Operating current IINIIN = IQ + IsinkCT × (1 − Du max) + Ciss × VIN × foscproviding that IQ = 8.4mA Typ (Supply current when oscillation in IC stops.)Ciss is the input gate capacitance of the power MOSFET which is connected and VIN isthe supply voltage of the IC.Note that the actual value may differ from the calculated one because of the internaldelay in operation and input characteristics of the POWER MOS FET. Check thevalue when mounting.Additionally a small Dumax leads to a large supply current, even if the frequency isnot changed, and start up may become difficult. In such a case, the followingmeasure is recommended.Example 1: Calculation when RT = 10kΩ and CT = 3300pFfosc = 52kHz, Du max = 95%, IIN = 9.7mAExample 2: Calculation for 50% of Du max and 200 kHz of foscRT = 693Ω, CT = 6360pF, IIN = 12.5mA(1) For an AC/DC converter, a small bleeder resistance is required.(2) The large capacitance between Vref and GND is required.(3) Use a large Dumax with a triangular wave and raise the current limit of theswitching device to around the maximum value (1.0V Typ).The current limit is expressed asRT − 440ΩHowever, Ciss = 1000pF, VIN = 18VRCS− 1Figure 11 Calculation of Operation Parameters

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