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RT9602 Datasheet(PDF) 9 Page - Richtek Technology Corporation |
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RT9602 Datasheet(HTML) 9 Page - Richtek Technology Corporation |
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9 / 11 page  RT9602 9 DS9602-08 March 2007 www.richtek.com Figure 5. Power Dissipation vs. Frequency (RT9602) Figure 6. Power Dissipatin vs. Frequency, PVCC = 5V The method to improve the thermal transfer is to increase the PCB copper area around the RT9602, first. Then, adding a ground pad under IC to transfer the heat to the peripheral of the board. Power on Over-Voltage Protection Function The RT9602 provides a protect function which can avoid some short condition happened before power on. The following discussion about the power on over-voltage protection function of RT9602 is based on the experiments of the high side MOSFET directly shorted to 12V. The test circuit as shown in the typical application circuit (with RT9241A/B dual-channel synchronous-rectified buck controller) the VCC and the phase signals are measured on the VCC pin and the phase pin of RT9602. The LGATE signal is measured on the gate terminal of MOSEFET. Figure 7 High Side Direct Short Figure 8. High Side Direct Short Time (50ms) lLGATE > VVcc > PPEASE > hrountCurrent > Through 12V Time (50ms) VVcc > PPEAS > lLGATE > lV CORE > The operating junction temperature can be calculated from the power dissipation curves (Figure 5 and Figure 6). Assume the RT9602 ’ s PVCC = VCC=12V, operating frequency is 200kHz, and the CU=CL=1.5nF which emulate the input capacitances of the high side and low side power MOSFETs. From Figure 5, the power dissipation is 500mW. In RT9602, the package thermal resistance θJA is 127.67 °C/W, the operating junction temperature is calculated as: TJ = 127.67 °C/W x 500mW+ 25°C = 88.84°C (11) where the 25 °C is the ambient temperature. Power Dissipation vs. Frequency 0 100 200 300 400 500 600 700 800 0 100 200 300 400 500 600 Frequency (kHz) PVcc=Vcc=12V CU=CL=1nF CU=CL=2nF CU=CL=3nF CU=CL=4nF CU=CL = 5nF Power Dissipation vs. Frequency 170 180 190 200 210 220 230 240 250 50 100 150 200 250 300 350 400 450 Frequency(kHz) RT9809-20CV CU=CL=2nF CU=CL=3nF CU=CL =5nF CU=CL=4nF CU=CL=1nF |
Similar Part No. - RT9602_07 |
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Similar Description - RT9602_07 |
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