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TPS2149IDGN Datasheet(PDF) 10 Page - Texas Instruments |
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TPS2149IDGN Datasheet(HTML) 10 Page - Texas Instruments |
10 / 34 page TPS2145, TPS2147 TPS2155, TPS2157 SLVS333 − AUGUST 2001 10 www.ti.com detailed description (continued) enable (ENx, ENx) The logic enable disables the power switch. Both switches have independent enables and are compatible with both TTL and CMOS logic. overcurrent (OCx) The OCx open-drain output is asserted (active low) when an overcurrent condition is encountered. The output will remain asserted until the overcurrent condition is removed. current sense A sense FET monitors the current supplied to the load. Current is measured more efficiently by the sense FET than by conventional resistance methods. When an overload or short circuit is encountered, the current-sense circuitry sends a control signal to the driver. The driver in turn reduces the gate voltage and drives the power FET into its saturation region, which switches the output into a constant-current mode and holds the current constant while varying the voltage on the load. thermal sense A dual-threshold thermal trip is implemented to allow fully independent operation of the power distribution switches. In an overcurrent or short-circuit condition, the junction temperature rises. When the die temperature rises to approximately 120 °C, the internal thermal sense circuitry determines which power switch is in an overcurrent condition and turns off that switch, thus isolating the fault without interrupting operation of the adjacent power switch. Because hysteresis is built into the thermal sense, the switch turns back on after the device has cooled approximately 10 degrees. The switch continues to cycle off and on until the fault is removed. undervoltage lockout A voltage sense circuit monitors the input voltage. When the input voltage is below approximately 2.5 V, a control signal turns off the power switch. PARAMETER MEASUREMENT INFORMATION IN OUT DUT + Current Meter A Figure 1. Current Limit Test Circuit |
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