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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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TPS54354PWP Fiches technique(PDF) 8 Page - Texas Instruments |
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TPS54354PWP Fiches technique(HTML) 8 Page - Texas Instruments |
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8 / 37 page  TPS54352,TPS54353 TPS54354,TPS54355 TPS54356,TPS54357 SLVS519A − MAY 2004 − REVISED OCTOBER 2004 www.ti.com 8 FUNCTIONAL BLOCK DIAGRAM VBIAS PH BOOT VIN LSG VBIAS Error Amplifier 2x Oscillator PWM Ramp (FeedFoward) SYNC RT VSENSE PWM Comparator Reference System ENA VBIAS2 Hiccup Timer Thermal Shutdown Current Limit Hiccup Hiccup UVLO UVLO UVLO 1.2V Bias + Drive Regulator PWRGD AGND PGND Rising Edge Delay VBIAS COMP Adaptive Deadtime and Control Logic 97% Ref POWERPAD VSENSE UVLO S R Q 320 k Ω 125 k Ω(1) 5 µA (1) 75 kΩ for the TPS54357 Z3 Z1 Z2 Z5 Z4 TPS5435X DETAILED DESCRIPTION Undervoltage Lockout (UVLO) The undervoltage lockout (UVLO) system has an internal voltage divider from VIN to AGND. The defaults for the start/stop values are labeled VIN and given in Table 1. The internal UVLO threshold can be overridden by placing an external resistor divider from VIN to ground. The internal divider values are approximately 320 k Ω for the high side resistor and 125 k Ω for the low side resistor. The divider ratio (and therefore the default start/stop values) is quite accurate, but the absolute values of the internal resistors may vary as much as 15%. If high accuracy is required for an externally adjusted UVLO threshold, select lower value external resistors to set the UVLO threshold. Using a 1-k Ω resistor for the low side resistor (R2 see Figure 1) is recommended. Under no circumstances should the UVLO pin be connected directly to VIN. Table 1. Start/Stop Voltage Threshold START VOLTAGE THRESHOLD STOP VOLTAGE THRESHOLD VIN (Default) TPS54352−6 4.49 3.69 VIN (Default) TPS54357 6.65 5.45 UVLO 1.24 1.02 The equations for selecting the UVLO resistors are: R1 + VIN(start) 1k W 1.24 V * 1kW VIN(stop) + (R1 ) 1kW) 1.02 V 1k W (1) (2) |
Numéro de pièce similaire - TPS54354PWP |
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Description similaire - TPS54354PWP |
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