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ISL9440A Datasheet(PDF) 3 Page - Intersil Corporation |
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ISL9440A Datasheet(HTML) 3 Page - Intersil Corporation |
3 / 11 page 3 AN1551.0 March 5, 2010 Load Transient Circuit Set-Up 1. Select a SOIC8 N-Channel MOSFET with VDS breakdown >20V. 2. Install the load transient circuit as indicated on the schematic. Refer to Figure 4 for detail. 3. R27, R22 and R25 are 10kΩ resistors for discharging the MOSFET gates. 4. R26, R23 and R24 are current sensing resistors to monitor the load step. For accurate measurement, please use 5% tolerance sensing resistor or better. To alleviate thermal stress, use 0.1Ω or smaller resistance. The resistance of the sensing resistors sets the current scale on the oscilloscope. 5. Apply pulse square waveform across R27, R22 or R25. The duty cycle of the pulse waveform should be small (<5%) to limit thermal stress on current sensing resistor and the MOSFETs (M8, M6 or M7). 6. The amplitude of the clock sets the current step amplitude. Adjust the clock amplitude and slew rate to set the current step and slew rate. 7. Monitor overshoot and undershoot at corresponding output. FIGURE 2. PROPER TEST SET-UP FIGURE 3. PROPER PROBE SET-UP TO MEASURE OUTPUT RIPPLE AND PHASE NODE RINGING OUTPUT CAP OR MOSFET OUTPUT CAP OR MOSFET OUTPUT CAP OR MOSFET Application Note 1551 |
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