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LM25007 Arkusz danych(PDF) 3 Page - Texas Instruments |
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LM25007 Arkusz danych(HTML) 3 Page - Texas Instruments |
3 / 19 page FB VIN VCC SW RTN ON TIMER DRIVER VIN BST LEVEL SHIFT SD/ RON 2.5V THERMAL SHUTDOWN 0.725A BUCK SWITCH CURRENT SENSE COMPLETE RCL START RCL COMPLETE START Ron 100 PH L1 C2 15 PF R3 3.01k R4 1k R2 100k RON 200k C4 0.01 PF C3 0.1 PF 12V -42V 10V LM25007 UVLO FB R5 1 UVLO REGULATION COMPARATOR OVER-VOLTAGE COMPARATOR 2.875V SD SD COMPLETE START MINIMUM OFF TIMER C1 1 PF 8 6 5 3 4 1 2 7 7V SERIES REGULATOR CURRENT LIMIT OFF TIMER SHUTDOWN C5 0.1 PF, 100V D1 Q CLR Q SET S R + - + - + - LM25007 www.ti.com SNVS401C – JANUARY 2006 – REVISED FEBRUARY 2013 Pin Descriptions Pin Name Description Application Information 1 SW Switching Node Power switching node. Connect to the inductor, bootstrap capacitor, and free-wheeling diode. 2 BST Boost Boot–strap An external capacitor is required between the BST and the SW pins. A 0.01µF ceramic capacitor input capacitor is recommended. 3 RCL Current Limit OFF time A resistor between this pin and RTN sets the off-time when current limit is detected. programming pin The off-time is preset to 17 µs if FB = 0V . 4 RTN Circuit Ground 5 FB Feedback Signal from This pin is connected to the inverting input of the internal regulation comparator. The Regulated Output regulation threshold is 2.5V. 6 RON/SD On-time set pin A resistor between this pin and VIN sets the switch on-time as a function of Vin. The minimum recommended on-time is 300ns at the maximum input voltage. 7 VCC Output from the internal If an auxiliary voltage is available to raise the voltage on this pin above the regulation high voltage bias setpoint (7V), the internal series pass regulator will shutdown, reducing the IC power regulator. dissipation. Do not exceed 14V. This output provides gate drive power for the internal Buck switch. An internal diode is provided between this pin and the BST pin. A local 0.1uF decoupling capacitor is recommended. 8 VIN Input supply voltage Recommended operating range: 9V to 42V. - EP Exposed pad, underside Exposed metal pad on the WSON package underside. It is recommended to connect of the WSON package this pad to the PC board ground plane to aid in heat dissipation. option Typical Application Circuit and Block Diagram Copyright © 2006–2013, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LM25007 |
Podobny numer części - LM25007 |
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Podobny opis - LM25007 |
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