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ISL9440A Datasheet(PDF) 3 Page - Intersil Corporation

Part # ISL9440A
Description  Triple PWM Step-Down Synchronous Buck Controller and One LDO
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL9440A Datasheet(HTML) 3 Page - Intersil Corporation

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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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