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TPS62004DGSRG4 Datasheet(PDF) 10 Page - Texas Instruments |
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TPS62004DGSRG4 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 31 page TPS62000, TPS62001, TPS62002, TPS62003 TPS62004, TPS62005, TPS62006, TPS62007, TPS62008 SLVS294F – SEPTEMBER 2000 – REVISED AUGUST 2015 www.ti.com Feature Description (continued) 8.3.3 Undervoltage Lockout An undervoltage lockout circuit provides the save operation of the device. It prevents the converter from turning on when the voltage on VIN is less than typically 1.6 V. 8.3.4 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. 8.4 Device Functional Modes The TPS6200x is a synchronous current-mode PWM converter with integrated – and P-channel power MOSFET switches. Synchronous rectification is used to increase efficiency and to reduce external component count. To achieve the highest efficiency over a wide load current range, the converter enters a power-saving pulse- frequency modulation (PFM) mode at light load currents. Operating frequency is typically 750 kHz, allowing the use of small inductor and capacitor values. The device can be synchronized to an external clock signal in the range of 500 kHz to 1 MHz. For low-noise operation, the converter can be operated in the PWM mode and the internal antiringing switch reduces noise and EMI. In the shutdown mode, the current consumption is reduced to less than 1 μA. The TPS62000 is available in the 10-pin (DGS) microsmall outline package (VSSOP). The device operates over a free-air temperature range of –40°C to 85°C. 8.4.1 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 12). When the soft-start function is completed, the error amplifier is connected directly to the internal voltage reference. 8.4.2 Synchronization, Power Save Mode, and Forced PWM Mode If no clock signal is applied, the converter operates with a typical switching frequency of 750 kHz. It is possible to synchronize the converter to an external clock within a frequency range from 500 kHz to 1000 kHz. The device automatically detects the rising edge of the first clock and is synchronized immediately to the external clock. If the clock signal is stopped, the converter automatically switches back to the internal clock and continues operation without interruption. The switch over is initiated if no rising edge on the SYNC pin is detected for a duration of four clock cycles. Therefore, the maximum delay time can be 8 μs in case the internal clock has a minimum frequency of 500 kHz. In case the device is synchronized to an external clock, the power save mode is disabled and the device stays in forced PWM mode. Connecting the SYNC pin to the GND pin enables the power save mode. The converter operates in the PWM mode at moderate to heavy loads and in the PFM mode during light loads maintaining high efficiency over a wide load current range. Connecting the SYNC pin to the VIN pin forces the converter to operate permanently in the PWM mode even at light or no load currents. The advantage is the converter operates with a fixed switching 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 (see ). 10 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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