PI2211-EVAL1 Cool-Swap™ PI2211-EVAL1: 12V/10A Cool-Swap™ Controller Evaluation Board User Guide under-voltage/enable and over-voltage. These pins can be used for monitoring or for connection to external control circuitry. The PI2211 EVAL1 evaluation board is not designed, nor is it intended, to be used as a component in an end-product. Please refer to the PI2211 datasheet for detailed functional descriptions, characteristics and specifications. Evaluation Board Test Points Figure 1 - PI2211 EVAL1 Evaluation Board The PI2211 EVAL1 evaluation board is designed to acquaint the user to the features and benefits of Picor's PI2211 CoolSwap™ controller; featuring True-SOA™ MOSFET power monitoring and protection, and Glitch-Catcher™ voltage suppression circuitry. The PI2211 EVAL1 board is designed for a 12V nominal BUS voltage, with an operational BUS range of 11V to 13V. It is designed to be run at 10A continuously with a circuit breaker threshold of 13A and a start-up current limit of 6.25A. The evaluation board features screw-type terminal blocks to allow for easy connections to a supply and a load. Key signal nodes are brought out to turret pins; such as power-good, Test Point Description GATE GATE drive signal of the PI2211 OV Over-Voltage pin. UV Under-Voltage and Enable pin. PG Power-good signal pin. DRAIN MOSFET Drain signal. VBUS Input BUS signal. VCC PI2211's VCC pin. GND reference for all signal measurements. GND Table 1 - Evaluation Board Test Points Evaluation Board Supply and Load Connections Figure 2 - Evaluation board connections. Picor Corporation · picorpower.com PI2211 Rev1 Preliminary, Page 1 of 7 PI2211-EVAL1 Cool-Swap™ PI2211 Evaluation Board Schematic Figure 3 - Final Design Schematic PI2211 Evaluation Board BOM Quantity Designator Manufacturer Manufacturer Part No. Value Description 1 U1 Picor PI2211-00-QAIG PI2211 PI2211 Hot-Swap Controller 1 C1 Murata GRM31CR61C106C31L 10uF Ceramic Capacitor, 16V 1 C2 TDK C1608X5R1E225K 2.2uF Ceramic Capacitor, 25V 1 C3 Murata GRM188R61C105KA93D 1uF Ceramic Capacitor, 16V 1 D1 Fairchild SS14 SS14 40V, 1A Schottky Diode 1 D2 Lite-On Inc. LTST-C191KRKT 1 Q1 Vishay SiR890DP SiR890DP N- MOSFET 2 R5, R7 Rohm MCR03EZPFX1000 100 Resistor, 0603 1 R6 Rohm MCR03EZPFX1002 10.0K Resistor, 0603 2 RACC, RTIMER Rohm MCR03EZPFX2002 20.0K RACC, RTIMER Resistor, 0603 1 R2 Rohm MCR03EZPFX8872 88.7K RHIGH Resistor, 0603 1 R3 Rohm MCR03EZPFX1541 1.54K RMID Resistor, 0603 1 R4 Rohm MCR03EZPFX4991 4.99K RLOW Resistor, 0603 1 R1 Yageo PR2512FKF070R004L 0.004 1W Current Sense Resistor 1 RSOAR Rohm MCR03EZPFX5901 5.90k RSOAR Resistor, 0603 1 RSOAS Rohm MCR03EZPFX2611 2.61k RSOAS Resistor, 0603 1 RSOAT Rohm MCR03EZPFX3571 3.57k RSOAT Resistor, 0603 2 BUS, LOAD Weidmuller 171602 2 Contact Terminal Block 7 GATE, GND, OV, PG, UV, VBUS, VCC Keystone 1528 Generic Testpoint 0603 Red LED Table 2 - PI2211 Evaluation board Bill of Materials Picor Corporation · picorpower.com PI2211 Rev1 Preliminary, Page 2 of 7 PI2211-EVAL1 Cool-Swap™ PI2211 Evaluation Board Waveforms Figure 4 - SOA Thermal Cycling Ch1) VGATE Ch2) Power Good Ch3) IBUS Ch4) VDRAIN The waveforms in Figure 4 show the performance of the SOA thermal cycling with a shorted output on the evaluation board. The first pulse represents a predicted 60°C junction temperature rise before ending. The second pulse starts once the predicted junction temperature rise has dropped to 29°C. The width of the second pulse to the 16th pulse represent a junction temperature rise of 31°C (29°C to 60°C). Figure 5 - Glitch-Catcher™ Circuit Breaker Turn-off. Ch1) VDRAIN Ch2) VGATE Ch3) VSOURCE Ch4) IBUS Picor Corporation · picorpower.com PI2211 Rev1 Preliminary, Page 3 of 7 PI2211-EVAL1 Cool-Swap™ Figure 5 shows the response of the Glitch-Catcher™ to a shorted output. The drain voltage (Ch1, blue) and the gate voltage (Ch2, cyan) both droop as the current increases through the MOSFET. Once the circuit breaker current threshold has been passed (Ch4, green), the gate gets discharged quickly until the drain voltage starts to rise. The rate of the gate's discharge is reduced to reduce the voltage rate of change on the drain. The discharge of the gate is controlled, toggling between a high a low discharge rate, to maintain the drain voltage over-shoot to be within the 15V limit. Figure 6 - Start-up with 6 x 470uF of load capacitance. Ch1) VSOURCE Ch2) Power Good Ch4) IBUS Figure 6 demonstrates the ability of the PI2211 to start-up a large amount of load capacitance. Here, there are 6, 470uF capacitors on the output of the demo board, a 12V BUS voltage and a start-up current limit of 6.25A. As the capacitors charge the voltage drop across the MOSFET decreases, decreasing the power across the MOSFET. Because the PI2211 monitors power, it will allow the MOSFET to remain on longer, calculating that the temperature increase has lessened due to the drop in power across the MOSFET. This increases the amount of load capacitance that the PI2211 can start-up with. Picor Corporation · picorpower.com PI2211 Rev1 Preliminary, Page 4 of 7 PI2211-EVAL1 Cool-Swap™ PCB Layout Figure 7 - Top Layer Figure 8 - Bottom Layer Picor Corporation · picorpower.com PI2211 Rev1 Preliminary, Page 5 of 7 PI2211-EVAL1 Cool-Swap™ PCB Mechanicals Figure 9 - PI2211 EVAL1 Board Dimensions Picor Corporation · picorpower.com PI2211 Rev1 Preliminary, Page 6 of 7 PI2211-EVAL1 Cool-Swap™ Warranty Vicor products are guaranteed for two years from date of shipment against defects in material or workmanship when in normal use and service. This warranty does not extend to products subjected to misuse, accident, or improper application or maintenance. Vicor shall not be liable for collateral or consequential damage. This warranty is extended to the original purchaser only. EXCEPT FOR THE FOREGOING EXPRESS WARRANTY, VICOR MAKES NO WARRANTY, EXPRESS OR LIMITED, INCLUDING, BUT NOT LIMITED TO, THE WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Vicor will repair or replace defective products in accordance with its own best judgment. For service under this warranty, the buyer must contact Vicor to obtain a Return Material Authorization (RMA) number and shipping instructions. Products returned without prior authorization will be returned to the buyer. The buyer will pay all charges incurred in returning the product to the factory. Vicor will pay all reshipment charges if the product was defective within the terms of this warranty. Information published by Vicor has been carefully checked and is believed to be accurate; however, no responsibility is assumed for inaccuracies. Vicor reserves the right to make changes to any products without further notice to improve reliability, function, or design. Vicor does not assume any liability arising out of the application or use of any product or circuit; neither does it convey any license under its patent rights nor the rights of others. Vicor general policy does not recommend the use of its components in life support applications wherein a failure or malfunction may directly threaten life or injury. Per Vicor Terms and Conditions of Sale, the user of Vicor components in life support applications assumes all risks of such use and indemnifies Vicor against all damages. Vicor’s comprehensive line of power solutions includes high density AC-DC and DC-DC modules and accessory components, fully configurable AC-DC and DC-DC power supplies, and complete custom power systems. Information furnished by Vicor is believed to be accurate and reliable. However, no responsibility is assumed by Vicor for its use. Vicor components are not designed to be used in applications, such as life support systems, wherein a failure or malfunction could result in injury or death. All sales are subject to Vicor’s Terms and Conditions of Sale, which are available upon request. Specifications are subject to change without notice. Vicor Corporation 25 Frontage Road Andover, MA 01810 USA Picor Corporation 51 Industrial Drive North Smithfield, RI 02896 USA Customer Service: [email protected] Technical Support: [email protected] Tel: 800-735-6200 Fax: 978-475-6715 Picor Corporation · picorpower.com PI2211 Rev1 Preliminary, Page 7 of 7