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TPS2066ADRBTG4 Fiches technique(PDF) 8 Page - Texas Instruments |
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TPS2066ADRBTG4 Fiches technique(HTML) 8 Page - Texas Instruments |
8 / 23 page OVERCURRENT OCx RESPONSE UNDERVOLTAGE LOCKOUT (UVLO) Enable (ENx or ENx) THERMAL SENSE TPS2062A TPS2066A SLVS798D – JANUARY 2008 – REVISED APRIL 2008 ..................................................................................................................................................... www.ti.com When an overcurrent condition is detected, the device maintains a constant output current and reduces the output voltage accordingly. Three possible overload conditions can occur. In the first condition, the output has been shorted before the device is enabled or before voltage is applied to IN. The device senses the short and immediately switches into a constant-current output. In the second condition, a short or an overload occurs while the device is enabled. At the instant the overload occurs, high currents may flow for several microseconds before the current-limit circuit can react. The device operates in constant-current mode after the current-limit circuit has responded. In the third condition, the load is increased gradually beyond the recommended operating current. The current is permitted to rise until the current-limit threshold is reached. The devices are capable of delivering current up to the current-limit threshold without damage. Once the threshold is reached, the device switches into constant-current mode. Complete shutdown occurs only if the fault is present long enough to activate thermal limiting. The device will remain off until the junction temperature cools approximately 10 °C and will then re-start. The device will continue to cycle on/off until the overcurrent condition is removed. Each OCx open-drain output is asserted (active low) during an overcurrent or overtemperature condition on that channel. The output remains asserted until the fault condition is removed. The TPS206xA eliminates false OCx reporting by using internal delay circuitry after entering or leaving an overcurrent condition. This "deglitch" time is approximately 8-ms. This ensures that OCx is not accidentally asserted due to normal operation such as starting into a heavy capacitive load. Overtemperature conditions are not deglitched and assert and de-assert the OCx signal immediately. The undervoltage lockout (UVLO) circuit disables the power switch until the input voltage reaches the UVLO turn-on threshold. Built-in hysteresis prevents unwanted on/off cycling due to input voltage drop from large current surges. The logic enable controls the power switch, bias for the charge pump, driver, and other circuits to reduce the supply current. The supply current is reduced to less than 5 µA when a logic high is present on ENx, or when a logic low is present on ENx. A logic low input on ENx or a logic high input on ENx enables the driver, control circuits, and power switch for that channel. The TPS206xA monitors the operating temperature of both power distribution switches with individual thermal sensors. The junction temperature of each channel rises during an overcurrent or short-circuit condition. When the die temperature of a particular channel rises above a minimum of 135 °C in an overcurrent condition, the internal thermal sense circuitry disables the individual channel in overtemperature to prevent damage. Hysteresis is built into the thermal sensor and re-enables the power switch individually after it has cooled approximately 10 °C. The power switch cycles on and off until the fault is removed. This topology allows one channel to continue normal operation even if the other channel is in an overtemperature condition. The open-drain overcurrent flag (OCx) is asserted (active low) corresponding to the channel that is in an overtemperature or overcurrent condition. 8 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS2062A TPS2066A |
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