USERS MANUAL ISL9440AEVAL1Z AN1551 Rev 0.00 Triple PWM Step-Down Synchronous Buck Controller and One LDO Mar 5, 2010 Evaluation Board TABLE 1. FEATURES OF ISL944xx FAMILY ISL9440AEVAL1Z Evaluation SWITCHING SOFT-STARTING Board PART EARLY FREQUENCY TIME The ISL9440AEVAL1Z evaluation board features the NUMBER WARNING (kHz) (ms) ISL9440A. The ISL9440A is a a quad-output controller ISL9440 Yes 300 1.7 that integrates three PWM synchronous buck controllers and one low-dropout linear regulator controller. The ISL9440A Yes 600 1.7 ISL9440A offers internal soft-start, independent enable ISL9441 No 300 1.7 functions and integrates UV/OV/OC/OT protection. Its current mode control architecture and internal ISL9440B Yes 300 Programmable compensation network keep peripheral component ISL9440C Yes 600 Programmable count minimal. Switching frequency of 600kHz minimizes inductor size while the strong gate drivers The ISL9440AEVAL1Z is easy to set up to evaluate the deliver up to 12A to each PWM channel. performance of the ISL9440A. Please refer to the Table 1 shows the difference in terms of ISL944xx family Electrical Specifications table on page 2 for typical features. performance summary. FIGURE 1. ISL9440AEVAL1Z EVALUATION BOARD AN1551 Rev 0.00 Page 1 of 12 Mar 5, 2010ISL9440AEVAL1Z Electrical Specifications Recommended operation conditions unless otherwise noted. Refer to the Schematic on page 7 and Typical Evaluation Board Performance Curves on page 4. PARAMETER TEST CONDITIONS MIN TYP MAX UNITS V All outputs are in regulation 6.0 12 16 V IN V 1 0.97 1.00 1.03 V OUT V 2 3.25 3.32 3.4 V OUT V 3 4.85 5.0 5.15 V OUT V 4 2.43 2.50 2.57 V OUT PWM1 Rated Current V = 12V, T = +25C, No forced airflow, all 67 A IN A three PWM outputs are fully loaded PWM2 Rated Current 67 A PWM3 Rated Current 45 A LDO Rated Current R = 0 , R is not populated 0.8 1.0 A 7 4 V 1 Peak-to-Peak Ripple V = 12V, all three PWM outputs are fully loaded, 19.4 mV OUT IN P-P oscilloscope is with full bandwidth V 2 Peak-to-Peak Ripple 36.6 mV OUT P-P V 3 Peak-to-Peak Ripple 32.2 mV OUT P-P Whats Inside Quick Test Guide The Evaluation Board Kit contains the following 1. Ensure that the circuit is correctly connected to the materials: supply and electronic loads prior to applying any power. Please refer to Figure 2 for proper set-up. The ISL9440AEVAL1Z 2. Connect Jumpers J , J and J in the ENx positions. 3 4 5 The ISL9440, ISL9440A, ISL9441 datasheet FN6383 3. Turn on the power supply. This Evaluation Board Kit document (AN1551) 4. Adjust input voltage V within the specified range IN and observe output voltage. The output voltage Recommended Equipment variation should be within 3%. The following materials are recommended to perform 5. Adjust load current within the specified range and testing: observe output voltage. The output voltage variation should be within 3%. 0V to 20V Power Supply with at least 10A source 6. Use oscilloscope to observe output voltage ripple current capability and phase node ringing. For accurate measurement, Three electronic loads capable of sinking current up refer to Figure 3 for proper test set-up. to 7A Digital Multimeters (DMMs) 100MHz Quad-Trace Oscilloscope Signal Generator (for load transient tests) AN1551 Rev 0.00 Page 2 of 12 Mar 5, 2010