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TPS2556QDRBTQ1 Datasheet(PDF) 9 Page - Texas Instruments |
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TPS2556QDRBTQ1 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 28 page Charge Pump Driver UVLO Current Limit Thermal Sense 8-ms Deglitch IN GND EN ILIM OUT FAULT CS Current Sense TPS2556-Q1, TPS2557-Q1 www.ti.com SLVSC97A – MARCH 2014 – REVISED MARCH 2014 8.2 Functional Block Diagram 8.3 Feature Description 8.3.1 Overcurrent Conditions The TPS2556-Q1 and TPS2557-Q1 devices respond to overcurrent conditions by limiting their output current to IOS. On detecting an overcurrent condition, the device maintains a constant output current, and the output voltage reduces accordingly. Two possible overload conditions can occur. The first condition is when a short circuit or partial short circuit is present on a powered-up and enabled device. With the output voltage held near zero potential with respect to ground, the TPS2556-Q1 or TPS2557-Q1 device ramps the output current to IOS. The TPS2556-Q1 and TPS2557-Q1 devices limit the current to IOS until removal of the overload condition or until the device begins to cycle thermally. 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 t(IOS) (see Figure 10). Overdriving the current-sense amplifier during this time and momentarily disables the internal N-channel MOSFET. The current-sense amplifier recovers and ramps the output current to IOS. Similar to the previous case, the TPS2556-Q1 and TPS2557-Q1 devices limit the current to IOS until removal of the overload condition or until the device begins to cycle thermally. The TPS2556-Q1 and TPS2557-Q1 cycle thermally 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 (minimum) while in current limit. The device remains off until the junction temperature cools 20°C (typical) and then restarts. The TPS2556-Q1 and TPS2557-Q1 cycle on and off until removal of the overload (see Figure 21). 8.3.2 FAULT Response Assertion (active-low) of the FAULT open-drain output occurs during an overcurrent or overtemperature condition. The TPS2556-Q1 and TPS2557-Q1 devices assert the FAULT signal until removal of the fault condition and the resumption of normal device operation. Design of the TPS2556-Q1 and TPS2557-Q1 devices eliminates false FAULT reporting by using an internal delay (9-ms typical) deglitch circuit for overcurrent conditions without the need for external circuitry. This avoids accidental FAULT assertion due to normal operation, such as starting into a heavy capacitive load. The deglitch circuitry delays entering and leaving current-limit-induced fault conditions. Deglitching of the FAULT signal does not occur when an overtemperature condition disables the MOSFET, but does occur after the device has cooled and begins to turn on. This unidirectional deglitch prevents FAULT oscillation during an overtemperature event. Copyright © 2014, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: TPS2556-Q1 TPS2557-Q1 |
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