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TPS71334DRCR Fiches technique(PDF) 11 Page - Texas Instruments |
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TPS71334DRCR Fiches technique(HTML) 11 Page - Texas Instruments |
11 / 19 page www.ti.com V OUT1 V IT + VHYS V IT V IN 0.6 V 0.0 V V OUT2 EN1 EN2 RESET t D t D t D = Reset Delay = Undefined State TPS71319 TPS71334 SBVS055A – DECEMBER 2004 – REVISED JANUARY 2005 output will remain unasserted during transients shorter than the reset circuit propagation delay (TP). SUPERVISOR DESCRIPTION Even with a 2.2 µF output capacitor, typical load The TPS713xx has an on-chip supply voltage super- transient conditions will not cause RESET to falsely visor (SVS) that monitors the voltage at OUT2. The assert. RESET output will assert if VOUT2 is below the reset The RESET pin requires an external resistor to pull threshold (VIT). When OUT2 exceeds the reset the pin high during the unasserted state. A 10 k Ω to 1 threshold plus hysteresis (VHYS), the RESET output M Ω resistor is suitable for most applications. If the will remain low for the specified delay time (tD). When resistance is too low, the pin may not pull low enough OUT2 is disabled by EN2 or the input voltage is to be recognized as a valid logic signal. If the pull-up below the under-voltage lockout (UVLO), the reset resistor is too large, the reset pin leakage may cause signal is automatically asserted. The functionality of the device not to pull high enough in the unasserted the reset circuit is shown in Figure 26 and Table 2. state. The pull-up voltage for the RESET pin should The output accuracy or output divider resistor toler- not exceed VIN + 0.3 V; doing so will turn on internal ances have minimal effect on the relative VIT ESD protection devices and may damage the device. threshold accuracy. The reset threshold VIT will scale accordingly to the actual output voltage. The RESET Figure 26. RESET Timing Diagram Table 2. Reset Pin Truth Table UVLO RESET EN2 Asserted VOUT2 Asserted X(1) Yes X Yes Low X X Yes High No VOUT2 > VIT No High No VOUT2 < VIT Yes (1) X = don't care. 11 |
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Description similaire - TPS71334DRCR |
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