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TPS622313DRYT Datasheet(PDF) 11 Page - Texas Instruments |
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TPS622313DRYT Datasheet(HTML) 11 Page - Texas Instruments |
11 / 40 page I = 0.5 x I OUT_PFM/PWM LPFMpeak IN OUT LPFMpeak ONmin (V V ) I = t L - ´ OUT ONmin IN V t = 260 ns V ´ 11 TPS62230, TPS62231, TPS62232, TPS62233, TPS62234, TPS62235, TPS62236 TPS62237, TPS62238, TPS62239, TPS622310, TPS622311, TPS622312 TPS622313, TPS622314, TPS622315, TPS622316, TPS622317, TPS622318, TPS622319 www.ti.com SLVS941G – APRIL 2009 – REVISED AUGUST 2016 Product Folder Links: TPS62230 TPS62231 TPS62232 TPS62233 TPS62234 TPS62235 TPS62236 TPS62237 TPS62238 TPS62239 TPS622310 TPS622311 TPS622312 TPS622313 TPS622314 TPS622315 TPS622316 TPS622317 TPS622318 TPS622319 Submit Documentation Feedback Copyright © 2009–2016, Texas Instruments Incorporated 8.4 Device Functional Modes 8.4.1 Soft-Start The TPS6223x has an internal soft start circuit that controls the ramp up of the output voltage and limits the inrush current during start-up. This limits input voltage drops when a battery or a high-impedance power source is connected to the input of the converter. The soft-start system generates a monotonic ramp up of the output voltage and reaches the nominal output voltage typically 100 μs after EN pin was pulled high. If the output voltage does not reached its target value by this time, such as in the case of heavy load, the converter then operates in a current limit mode set by its switch current limits. TPS6223x is able to start into a prebiased output capacitor. The converter starts with the applied bias voltage and ramps the output voltage to its nominal value. 8.4.2 Power-Save Mode Connecting the MODE pin to GND enables the automatic PWM and power-save mode operation. The converter operates in quasi-fixed frequency PWM mode at moderate to heavy loads and in the pulse frequency modulation (PFM) mode during light loads, which maintains high efficiency over a wide load current range. In PFM mode, the device starts to skip switch pulses and generates only single pulses with an ON-time of tONmin. The PFM mode frequency depends on the load current and the external inductor and output capacitor values. The PFM mode of TPS6223x is optimized for low-output voltage ripple if small external components are used. Even at low output currents, the PFM frequency is above the audible noise spectrum and makes this operation mode suitable for audio applications. The ON-time tONmin can be estimated to: (1) Therefore, the peak inductor current in PFM mode is approximately: (2) The transition from PFM into PWM mode and vice versa can be estimated to: where • tON: High-side switch ON-time [ns] • VIN: Input voltage [V] • VOUT: Output voltage [V] • L: Inductance [μH] • ILPFMpeak: PFM inductor peak current [mA] • IOUT_PFM/PWM: Output current for PFM to PWM mode transition and vice versa [mA] (3) 8.4.3 Forced PWM Mode Pulling the MODE pin high forces the converter to operate in a continuous conduction PWM mode even at light load currents. The advantage is that the converter operates with a quasi-fixed frequency that allows simple filtering of the switching frequency for noise-sensitive applications. In this mode, the efficiency is lower compared to the power save mode during light loads. This pin must be terminated except for the TPS622319 , which has an integrated 1MΩ always active pull-down resistor. For additional flexibility, it is possible to switch from power-save mode to forced PWM mode during operation. This allows efficient power management by adjusting the operation of the converter to the specific system requirements. |
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