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TPS54350 Datasheet(PDF) 6 Page - Texas Instruments |
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TPS54350 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 34 page TPS54350 SLVS456C − OCTOBER 2003 − REVISED OCTOBER 2004 www.ti.com 6 APPLICATION INFORMATION 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 TPS54350 Adaptive Deadtime and Control Logic 97% Ref POWERPAD VSENSE UVLO S R Q 320 k Ω 125 k Ω 5 µA 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) 4.49 3.69 UVLO 1.24 1.02 |
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