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TPS62160QDSGTQ1 Fiches technique(PDF) 9 Page - Texas Instruments |
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TPS62160QDSGTQ1 Fiches technique(HTML) 9 Page - Texas Instruments |
9 / 34 page OUT ON IN V t 420ns V = ´ 9 TPS62160-Q1, TPS62162-Q1 www.ti.com SLVSCK6A – DECEMBER 2014 – REVISED NOVEMBER 2016 Product Folder Links: TPS62160-Q1 TPS62162-Q1 Submit Documentation Feedback Copyright © 2014–2016, Texas Instruments Incorporated Feature Description (continued) space The TPS6216x-Q1 can start into a pre-biased output. During monotonic pre-biased startup, the low-side MOSFET is not allowed to turn on until the device's internal ramp sets an output voltage above the pre-bias voltage. 9.3.3 Power Good (PG) The TPS6216x-Q1 has a built in power good (PG) function to indicate whether the output voltage has reached its appropriate level or not. The PG signal can be used for startup sequencing of multiple rails. The PG pin is an open-drain output that requires a pull-up resistor (to any voltage below 7 V). It can sink 2 mA of current and maintain its specified logic low level. It is high impedance when the device is turned off due to EN, UVLO or thermal shutdown. 9.3.4 Under Voltage Lockout (UVLO) If the input voltage drops, the under voltage lockout prevents misoperation of the device by switching off both the power FETs. The under voltage lockout threshold is set typically to 2.7 V. The device is fully operational for voltages above the UVLO threshold and turns off if the input voltage trips the threshold. The converter starts operation again once the input voltage exceeds the threshold by a hysteresis of typically 180 mV. 9.3.5 Thermal Shutdown The junction temperature (TJ) of the device is monitored by an internal temperature sensor. If TJ exceeds 160°C (typ), the device goes into thermal shut down. Both the high-side and low-side power FETs are turned off and PG goes high impedance. When TJ decreases below the hysteresis amount, the converter resumes normal operation, beginning with Soft Start. To avoid unstable conditions, a hysteresis of typically 20°C is implemented on the thermal shut down temperature. 9.4 Device Functional Modes 9.4.1 Pulse Width Modulation (PWM) Operation The TPS6216x-Q1 operates with pulse width modulation in continuous conduction mode (CCM) with a nominal switching frequency of about 2.25 MHz. The frequency variation in PWM is controlled and depends on VIN, VOUT and the inductance. The device operates in PWM mode as long the output current is higher than half the inductor's ripple current. To maintain high efficiency at light loads, the device enters Power Save Mode at the boundary to discontinuous conduction mode (DCM). This happens if the output current becomes smaller than half the inductor's ripple current. 9.4.2 Power Save Operation The TPS6216x-Q1's built in Power Save Mode will be entered seamlessly, if the load current decreases. This secures a high efficiency in light load operation. The device remains in Power Save Mode as long as the inductor current is discontinuous. In Power Save Mode the switching frequency decreases linearly with the load current maintaining high efficiency. The transition into and out of Power Save Mode happens within the entire regulation scheme and is seamless in both directions. The TPS6216x-Q1 includes a fixed on-time circuitry. This on-time, in steady-state operation, can be estimated as: space (1) space For very small output voltages, the on-time increases beyond the result of Equation 1, to stay above an absolute minimum on-time, tON(min), which is around 80 ns to limit switching losses. |
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