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TPS5110 Datasheet(PDF) 9 Page - Texas Instruments |
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TPS5110 Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 43 page  TPS5110 SLVS025B − APRIL 2002 − REVISED JULY 2004 9 www.ti.com DETAILED DESCRIPTION dead time The internally defined dead-time prevents shoot-through current flowing through the main power MOSFETs during switching transitions. Typical value of the dead-time is 100 ns. standby The SBRC and the LDO controller can be switched into standby mode separately by grounding the STBY pin and/or SYBY_LDO pins. The standby-mode current, when both controllers are off, can be as low as 1 nA. Table 1. Standby Logic (VREG5V_IN > 4 V){ STBY STBY_LDO SBRC LDO POWERGOOD L L OFF OFF OFF L H OFF ON OFF H L ON OFF OFF H H ON ON ON soft start Soft-start ramp up of the SBRC is controlled by the SOFTSTART pin voltage. After the STBY pin is raised to a HIGH level, an internal current source charges up an external capacitor connected between the SOFTSTART and GND pins. The output voltage ramps up as the SOFTSTART pin voltage increases from 0 V to 0.85 V. The soft-start time is easily calculated by the supply current and the capacitance value (see application information). The soft-start timing circuit for the LDO is integrated into the device. The soft-start time is fixed and can be as short as 600 µs. This is observed when the LDO is turned on separately from the SBRC. Simultaneous start up of the two outputs is also possible. Tie the LDO input to the SBRC’s output and let both STBY_LDO and STBY voltages rise to the HIGH level simultaneously, then the LDO’s output follows the ramp of the SBRC’s output. over current protection Over current protection (OCP) is achieved by comparing the drain-to-source voltage of the high-side and low-side MOSFET to a set-point voltage, which is defined by both the internal current source, ITRIP, and the external resistor connected between the VIN_SENSE and TRIP pins. ITRIP has a typical value of 13 µA at 25°C. When the drain-to-source voltage exceeds the set-point voltage during low-side conduction, the high-side current comparator becomes active, and the low-side pulse is extended until this voltage comes back below the threshold. If the set-point voltage is exceeded during high-side conduction in the following cycle, the current-limit circuit terminates the high-side driver pulse. Together this action has the effect of decreasing the output voltage until the under voltage protection circuit is activated to latch both the high-side and low-side drivers OFF. In the TPS5110, trip current ITRIP also has a temperature coefficient of 3400 ppm/°C in order to compensate for temperature drift of the MOSFET on-resistance. |
Número de pieza similar - TPS5110_16 |
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Descripción similar - TPS5110_16 |
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