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LM5008 Scheda tecnica(PDF) 3 Page - National Semiconductor (TI) |
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LM5008 Scheda tecnica(HTML) 3 Page - National Semiconductor (TI) |
3 / 15 page Pin Description PIN NAME DESCRIPTION APPLICATION INFORMATION 1 SW Switching Node Power switching node. Connect to the output inductor, re-circulating diode, and bootstrap capacitor. 2 BST Boost Pin (Boot–strap capacitor input) An external capacitor is required between the BST and the SW pins. A 0.01µF ceramic capacitor is recommended. An internal diode charges the capacitor from V CC. 3R CL Current Limit OFF time set pin Toff = 10 -5 / (0.285 + (FB / 6.35 x 10−6 xR CL)) A resistor between this pin and RTN sets the off-time when current limit is detected. The off-time is preset to 35µs if FB = 0V. 4 RTN Ground pin Ground for the entire circuit. 5 FB Feedback input from Regulated Output This pin is connected to the inverting input of the internal regulation comparator. The regulation threshold is 2.5V. 6R ON/SD On time set pin Ton = 1.25 x 10 -10 R ON /VIN A resistor between this pin and V IN sets the switch on time as a function of V IN. The minimum recommended on time is 400ns at the maximum input voltage. This pin can be used for remote shutdown. 7V CC Output from the internal high voltage series pass regulator. Regulated at 7.0V. If an auxiliary voltage is available to raise the voltage on this pin, above the regulation setpoint (7V), the internal series pass regulator will shutdown, reducing the IC power dissipation. Do not exceed 14V. This voltage provides gate drive power for the internal Buck switch. An internal diode is provided between this pin and the BST pin. A local 0.1µF decoupling capacitor is recommended. Series pass regulator is current limited to 10mA. 8V IN Input voltage Recommended operating range: 9.5V to 95V. www.national.com 3 |
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