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TPS62002DGSR Datasheet(PDF) 8 Page - Texas Instruments |
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TPS62002DGSR Datasheet(HTML) 8 Page - Texas Instruments |
8 / 31 page TPS62000, TPS62001, TPS62002, TPS62003 TPS62004, TPS62005, TPS62006, TPS62007, TPS62008 SLVS294F – SEPTEMBER 2000 – REVISED AUGUST 2015 www.ti.com 8 Detailed Description 8.1 Overview The TPS6200x is a step down converter operating in a current mode PFM/PWM scheme with a typical switching frequency of 750 kHz. At moderate to heavy loads, the converter operates in the pulse width modulation (PWM) and at light loads the converter enters a power save mode (pulse frequency modulation, PFM) to keep the efficiency high. In the PWM mode operation, the part operates at a fixed frequency of 750 kHz. At the beginning of each clock cycle, the high side P-channel MOSFET is turned on. The current in the inductor ramps up and is sensed via an internal circuit. The high side switch is turned off when the sensed current causes the PFM/PWM comparator to trip when the output voltage is in regulation or when the inductor current reaches the current limit (set by ILIM). After a minimum dead time preventing shoot through current, the low side N-channel MOSFET is turned on and the current ramps down again. As the clock cycle is completed, the low side switch is turned off and the next clock cycle starts. In discontinuous conduction mode (DCM), the inductor current ramps to zero before the end of each clock cycle. In order to increase the efficiency the load comparator turns off the low side MOSFET before the inductor current becomes negative. This prevents reverse current flowing from the output capacitor through the inductor and low side MOSFET to ground that would cause additional losses. As the load current decreases and the peak inductor current does not reach the power save mode threshold of typically 120 mA for more than 15 clock cycles, the converter enters a pulse frequency modulation (PFM) mode. In the PFM mode, the converter operates with: • Variable frequency • Constant peak current that reduces switching losses • Quiescent current at a minimum Thus maintaining the highest efficiency at light load currents. In this mode, the output voltage is monitored with the error amplifier. As soon as the output voltage falls below the nominal value, the high side switch is turned on and the inductor current ramps up. When the inductor current reaches the peak current of typical: 150 mA + 50 mA/V × (VIN – VOUT), the high side switch turns off and the low side switch turns on. As the inductor current ramps down, the low side switch is turned off before the inductor current becomes negative which completes the cycle. When the output voltage falls below the nominal voltage again, the next cycle is started. The converter enters the PWM mode again as soon as the output voltage can not be maintained with the typical peak inductor current in the PFM mode. The control loop is internally compensated reducing the amount of external components. The switch current is internally sensed and the maximum current limit can be set to typical 600 mA by connecting ILIM to ground; or, to typically 1.2 A by connecting ILIM to VIN. 8 Submit Documentation Feedback Copyright © 2000–2015, Texas Instruments Incorporated Product Folder Links: TPS62000 TPS62001 TPS62002 TPS62003 TPS62004 TPS62005 TPS62006 TPS62007 TPS62008 |
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