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TPS6209718 Datasheet(PDF) 9 Page - Texas Instruments |
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TPS6209718 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 28 page L V V V V t I 2 f OUT IN OUT IN 2 ON OUT PSM - ´ ´ ´ = EN V OUT PG Disable Enable MODE Detection Soft Startup TPS62097 www.ti.com SLVSCD6 – DECEMBER 2015 Device Function Modes (continued) Once the EN pin is pulled high, the IC enables internal circuit blocks and prepares to ramp the output up. The period between the rising edge of the EN pin and the beginning of the power stage switching is called the MODE detection time, typically 50µs. During the MODE detection time period, shown in Figure 3, the PWM switching frequency and operating mode are set by the MODE pin status, as shown in Table 1. The PWM switching frequency can't be changed after the detection time period. Only when the device is set in PWM/PSM mode during the MODE detection time period (MODE = AGND), it is possible to switch between PWM/PSM and forced PWM operation modes by toggling the MODE pin with a GPIO pin of a micro-controller, for example. The other four MODE pin selections force the device in PWM mode only. Figure 3. Power Up Sequence Table 1. Switching Frequency and Mode Selection Typical PWM Resistance at MODE pin Toggle MODE pin after Switching ON-Time Equation Operating Mode (E24 EIA Value) MODE detection Frequency (MHz) 1.50 8.2k Ω ±5% No tON = 667ns x VOUT / VIN Forced PWM 1.75 18k Ω ±5% No tON = 571ns x VOUT / VIN Forced PWM PWM/PSM and 2.00 AGND Yes tON = 500ns x VOUT / VIN Forced PWM 2.25 39k Ω ±5% No tON = 444ns x VOUT / VIN Forced PWM 2.50 75k Ω ±5% or Open No tON = 400ns x VOUT / VIN Forced PWM Connecting the MODE pin to AGND with a resistor or leaving the MODE pin open forces the device into PWM mode for the whole load range. The device operates with a fixed switching frequency that allows simple filtering of the switching frequency for noise sensitive applications. In forced PWM mode, the efficiency is lower than that of PSM at light load. Connecting the MODE pin to the AGND pin enables Power Save Mode with an automatic transition between PWM and Power Save Mode. As the load current decreases and the inductor current becomes discontinuous, the device enters Power Save Mode operation automatically. In Power Save Mode, the switching frequency is reduced and estimated by Equation 2. In Power Save Mode, the output voltage rises slightly above the nominal output voltage, as shown in Figure 13. This effect is minimized by increasing the output capacitor. (2) When the device operates close to 100% duty cycle mode, the TPS62097 can't enter Power Save Mode regardless of the load current if the input voltage decreases to typically 15% above the output voltage. The device maintains output regulation in PWM mode. Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: TPS62097 |
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