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TPS2592ZL データシート(PDF) 11 Page - Texas Instruments |
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TPS2592ZL データシート(HTML) 11 Page - Texas Instruments |
11 / 30 page 3, 4, 5 VIN 2 EN/ UVLO + 1.4V 1.35V 4.3V 4.08V + UVLO EN TSD 220nA 70pF 6V SWEN 4.8x 80W 10 ILIM + VIN + ILIMIT 1.6*ILIMIT 10 A m 6V GATE CONTROL Charge Pump Over Voltage Thermal Shutdown 6, 7, 8 28mW BFET 9 SWEN 22W 2 A m SWEN Current Sense 1 dV/dT EP GND OUT Fast Trip Comp Not Recommended for New Designs TPS2592ZA, TPS2592ZL www.ti.com SLVSCU3 – DECEMBER 2014 9 Detailed Description 9.1 Overview The TPS2592xx is an e-fuse with integrated power switch that is used to manage current/voltage/start-up voltage ramp to a connected load. The device starts its operation by monitoring the VIN bus. When VIN exceeds the undervoltage-lockout threshold (VUVR), the device samples the EN/UVLO pin. A high level on this pin enables the internal MOSFET. As VIN rises, the internal MOSFET of the device will start conducting and allow current to flow from VIN to OUT. When EN/UVLO is held low (below VENF), internal MOSFET is turned off. User also has the ability to modify the output voltage ramp time by connecting a capacitor between dV/dT pin and GND. After a successful start-up sequence, the device now actively monitors its load current, ensuring that the adjustable overload current limit IOL is not exceeded. The device also has built-in thermal sensor. In the event device temperature (TJ) exceeds TSHDN, typically 160°C, the thermal shutdown circuitry will shut down the internal MOSFET thereby disconnecting the load from the supply. In TPS2592xL, the output will remain disconnected (MOSFET open) until power to device is recycled or EN/UVLO is toggled (pulled low and then high). The TPS2592xA device will remain off during a cooling period until device temperature falls below TSHDN – 10°C, after which it will attempt to restart. This ON and OFF cycle will continue until fault is cleared. 9.2 Functional Block Diagram 9.3 Feature Description 9.3.1 GND This is the most negative voltage in the circuit and is used as a reference for all voltage measurements unless otherwise specified. 9.3.2 VIN Input voltage to the TPS2592Zx. A ceramic bypass capacitor close to the device from VIN to GND is recommended to alleviate bus transients. The recommended operating voltage range is 4.5 V to 18 V for TPS2592Zx. The device can continuously sustain a voltage of 20 V on VIN pin. However, above the recommended maximum bus voltage, the device will be in over-voltage protection (OVP) mode, limiting the output voltage to VOVC. The power dissipation in OVP mode is PD_OVP = (VVIN - VOVC) x IOUT, which can potentially heat up the device and cause thermal shutdown. Copyright © 2014, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: TPS2592ZA TPS2592ZL |
同様の部品番号 - TPS2592ZL |
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同様の説明 - TPS2592ZL |
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