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TPS62008QDGSRQ1 Datasheet(PDF) 6 Page - Texas Instruments |
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TPS62008QDGSRQ1 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 26 page TPS62000Q1, TPS62001Q1, TPS62002Q1, TPS62003Q1 TPS62004Q1, TPS62005Q1, TPS62006Q1, TPS62007Q1, TPS62008Q1 HIGHEFFICIENCY STEPDOWN LOW POWER DCDC CONVERTER SGLS243A − APRIL 2004 − REVISED JUNE 2008 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 low noise antiringing switch An antiringing switch is implemented in order to reduce the EMI radiated from the converter during discontinuous conduction mode (DCM). In DCM, the inductor current ramps to zero before the end of each switching period. The internal load comparator turns off the low side switch at that instant thus preventing the current flowing backward through the inductance which increases the efficiency. An antiringing switch across the inductor prevents parasitic oscillation caused by the residual energy stored in the inductance (see Figure 12). NOTE: The antiringing switch is only activated in the fixed output voltage versions. It is not enabled for the adjustable output voltage version TPS62000. soft start As the enable pin (EN) goes high, the soft-start function generates an internal voltage ramp. This causes the start-up current to slowly rise preventing output voltage overshoot and high inrush currents. The soft-start duration is typical 1 ms (see Figure 13). When the soft-start function is completed, the error amplifier is connected directly to the internal voltage reference. enable Logic low on EN forces the TPS6200x into shutdown. In shutdown, the power switch, drivers, voltage reference, oscillator, and all other functions are turned off. The supply current is reduced to less than 1 µA in the shutdown mode. undervoltage lockout An undervoltage lockout circuit provides the save operation of the device and it prevents the converter from turning on when the voltage on VIN is less than 1.6 V typical. power good comparator The power good (PG) comparator has an open drain output capable of sinking typically 10 µA. The PG is only active when the device is enabled (EN = high). When the device is disabled (EN = low), the PG pin is high impedance. The PG output is only valid after a 100 µs delay after the device is enabled and the supply voltage is greater than 1.2 V. This is only important in cases where the pullup resistor of the PG pin is connected to an external voltage source, which might cause an initial spike (false high signal) within the first 100 µs after the input voltage exceeds 1.2 V. This initial spike can be filtered with a small R-C filter to avoid false power good signals during start-up. If the PG pin is connected to the output of the TPS62000 with a pullup resistor, no initial spike (false high signal) occurs and no precautions have to be taken during start-up. The PG pin becomes active high when the output voltage exceeds typically 94.5% of its nominal value. Leave the PG pin unconnected when not used. no load operation In case the converter operates in the forced PWM mode and there is no load connected to the output, the converter regulates the output voltage by allowing the inductor current to reverse for a short period of time. |
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