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Short Circuit Protection Vishay Short Circuit Protection Any accidental short between the output pin and the GND pin of the FunctionPAK could cause permanent damage to the device. Whether that short is the result of component fatigue, accumulation of dust or debris over time, or accidental shorting by technicians during system check-out, the results would be the same. The best way to protect this circuit is to limit the current automatically to a safe level or place a fast-blow fuse in the input circuit. If this option is not available in the system, here are two other ways to protect the FunctionPAK. 1. If the output voltage is 2.5 volts or above, connect the PWM pin directly to the output pin instead of to the input pin. 2. If the output voltage is below 2.5 volts, connect the following circuit to the FunctionPAK for short-circuit protection. Vout Vin R1 20K R2 30K R3 3.9K SD Q1 C1 2µF GND ITEM QTY DESIGNATOR PART TYPE DESCRIPTION FOOTPRINT MANUFACTURER 1 1 R1 20k Resistor, 5%, 1/8W 0402 Vishay Dale 2 1 R2 30k Resistor, 5%, 1/8W 0402 Vishay Dale 3 1 R3 3.9k Resistor, 5%, 1/8W 0402 Vishay Dale 4 1 C1 2µF Capacitor Ceramic 16V; 10% 0402 Vishay Vitramon 5 1 Q1 SI6966EDQ Dual N-Ch. MOSFET TSSOP-8 Vishay Siliconix www.vishay.com 92 For technical questions, contact [email protected] For marketing questions, contact [email protected] Document Number: 10128 Revision: 09-Sep-04