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TPS2560A Datasheet(PDF) 10 Page - Texas Instruments |
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TPS2560A Datasheet(HTML) 10 Page - Texas Instruments |
10 / 24 page TPS2560A TPS2561A SLVSB28 – DECEMBER 2011 www.ti.com DETAILED DESCRIPTION OVERVIEW The TPS2560A/61A is a dual-channel, current-limited power-distribution switch using N-channel MOSFETs for applications where short circuits or heavy capacitive loads will be encountered. This device allows the user to program the current-limit threshold between 250 mA and 2.8 A (typ) per channel via an external resistor. This device incorporates an internal charge pump and gate drive circuitry necessary to drive the N-channel MOSFETs. The charge pump supplies power to the driver circuit for each channel and provides the necessary voltage to pull the gate of the MOSFET above the source. The charge pump operates from input voltages as low as 2.5 V and requires little supply current. The driver controls the gate voltage of the power switch. The driver incorporates circuitry that controls the rise and fall times of the output voltage to limit large current and voltage surges and provides built-in soft-start functionality. Each channel of the TPS2560A/61A limits the output current to the programmed current-limit threshold IOS during an overcurrent or short-circuit event by reducing the charge pump voltage driving the N-channel MOSFET and operating it in the linear range of operation. The result of limiting the output current to IOS reduces the output voltage at OUTx because the N-channel MOSFET is no longer fully enhanced. OVERCURRENT CONDITIONS The TPS2560A/61A responds to overcurrent conditions by limiting the output current per channel to IOS. When an overcurrent condition is detected, the device maintains a constant output current and reduces the output voltage accordingly. Two possible overload conditions can occur. The first condition is when a short circuit or partial short circuit is present when the device is powered-up or enabled. The output voltage is held near zero potential with respect to ground and the TPS2560A/61A ramps the output current to IOS. The TPS2560A/61A devices will limit the current to IOS until the overload condition is removed or the device begins to thermal cycle. The second condition is when a short circuit, partial short circuit, or transient overload occurs while the device is enabled and powered on. The device responds to the overcurrent condition within time tIOS (see Figure 3). The current-sense amplifier is overdriven during this time and momentarily disables the internal current-limit MOSFET. The current-sense amplifier recovers and ramps the output current to IOS. Similar to the previous case, the TPS2560A/61A will limit the current to IOS until the overload condition is removed or the device begins to thermal cycle. The TPS2560A/61A thermal cycles if an overload condition is present long enough to activate thermal limiting in any of the above cases. The device turns off when the junction temperature exceeds 135 °C (min) while in current limit. The device remains off until the junction temperature cools 20 °C (typ) and then restarts. The TPS2560A/61A cycles on/off until the overload is removed (see Figure 9) . 10 Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated Product Folder Link(s): TPS2560A TPS2561A |
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