Electronic Components Datasheet Search |
|
ISL9440A Datasheet(PDF) 3 Page - Intersil Corporation |
|
ISL9440A Datasheet(HTML) 3 Page - Intersil Corporation |
3 / 14 page 3 AN1454.0 September 25, 2009 Load Transient Circuit Set-up 1. Select a DPAK N channel MOSFET with VDSS breakdown > 20V. 2. Install the load transient circuit as indicated on the schematic. Refer to Figure 3 for details. 3. R12, R14, R16 are 10k Ω resistors for discharging the MOSFET gates. 4. R13, R15 and R17 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 0.1 Ω or smaller resistance. The resistance of the sensing resistors sets the current scale on the oscilloscope. 5. Apply pulse square waveform to the ISTEP_CLK1, ISTEP_CLK2 and ISTEP_CLK3. The duty cycle of the pulse waveform should be small (<5%) to limit thermal stress on current sensing resistor and the MOSFETs (Q8, Q9 and Q10 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 PROBE SET-UP TO MEASURE OUTPUT RIPPLE AND PHASE NODE RINGING. OUTPUT CAP OR MOSFET OUTPUT CAP OR MOSFET OUTPUT CAP OR MOSFET FIGURE 3. LOAD TRANSIENT CIRCUIT FOR PWM1 J17 R15 OPT, 0.01 R14 OPT, 10k J18 ISTEP1 Q10 OPT, SUD50N03-16P Typical Evaluation Board Performance Curves VIN = 9V, unless otherwise specified. FIGURE 4. PWM1 EFFICIENCY vs LOAD (VO = 5.0V) FIGURE 5. PWM2 EFFICIENCY vs LOAD (VO = 3.3V) 60 65 70 75 80 85 90 95 100 0 4 6 8 10 12 14 16 LOAD CURRENT (A) VIN = 23VDC 2 VIN = 19VDC VIN = 16VDC 60 65 70 75 80 85 90 95 100 0 8 10 12 14 16 LOAD CURRENT (A) 24 6 VIN = 16VDC VIN = 19VDC VIN = 23VDC Application Note 1454 |
Similar Part No. - ISL9440A |
|
Similar Description - ISL9440A |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |