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TPS799-Q1 Fiches technique(PDF) 9 Page - Texas Instruments |
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TPS799-Q1 Fiches technique(HTML) 9 Page - Texas Instruments |
9 / 25 page Thermal Shutdown UVLO Current Limit 3.3MW Overshoot Detect 500k 1.193V Bandgap IN EN FB OUT GND 400W TPS799-Q1 www.ti.com SBVS097F – MARCH 2008 – REVISED JUNE 2015 Functional Block Diagrams (continued) Figure 11. Adjustable-Voltage Version 7.3 Feature Description 7.3.1 Internal Current Limit The TPS799xx-Q1 internal current limit helps protect the regulator during fault conditions. During current limit, the output sources a fixed amount of current that is largely independent of output voltage. For reliable operation, the device should not be operated in current limit for extended periods of time. The PMOS pass element in the TPS799xx-Q1 has a built-in body diode that conducts current when the voltage at OUT exceeds the voltage at IN. This current is not limited, so if extended reverse voltage operation is anticipated, external limiting may be appropriate. 7.3.2 Shutdown The enable pin (EN) is active high and is compatible with standard and low voltage TTL-CMOS levels. When shutdown capability is not required, EN can be connected to IN. 7.3.3 Dropout Voltage The TPS799xx-Q1 uses a PMOS pass transistor to achieve low dropout. When (VIN – VOUT) is less than the dropout voltage (VDO), the PMOS pass device is in its linear region of operation and the input-to-output resistance is the RDS, ON of the PMOS pass element. Because the PMOS device behaves like a resistor in dropout, VDO scales approximately with output current. As with any linear regulator, PSRR and transient response are degraded as (VIN – VOUT) approaches dropout. This effect is shown in Figure 7 through Figure 9 in the Typical Characteristics section. 7.3.4 Start-Up Fixed voltage versions of the TPS799xx-Q1 use a quick-start circuit to fast-charge the noise reduction capacitor, CNR, if present (see Figure 10). This allows the combination of very low output noise and fast start-up times. The NR pin is high impedance so a low leakage CNR capacitor must be used; most ceramic capacitors are appropriate in this configuration. For the fastest start-up, VIN should be applied first, then the enable pin (EN) driven high. If EN is tied to IN, startup is somewhat slower. The quick-start switch is closed for approximately 135 μs. To ensure that CNR is fully charged during the quick-start time, a 0.01 μF or smaller capacitor should be used. Copyright © 2008–2015, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: TPS799-Q1 |
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