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SM72441 Scheda tecnica(PDF) 9 Page - Texas Instruments |
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SM72441 Scheda tecnica(HTML) 9 Page - Texas Instruments |
9 / 15 page VIN VA C1 D1 D2 R1 C2 3 pF 30 pF Conversion Phase: Switch Open Track Phase: Switch Close SM72441 www.ti.com SNOSB64G – OCTOBER 2010 – REVISED APRIL 2013 RESET PIN When the reset pin is pulled low, the chip will cease its normal operation and turn-off all of its PWM outputs. Below is an oscilloscope capture of a forced reset condition. Figure 6. Reset Operational Behavior As seen in Figure 6, the initial value for output voltage and load current are 28V and 1A respectively. After the reset pin is grounded, both the output voltage and load current decreases immediately. MOSFET switching on the buck-boost converter also stops immediately. VLOB indicates the low side boost output from the SM72295. ANALOG INPUT An equivalent circuit for one of the ADC input channels is shown in Figure 7. Diode D1 and D2 provide ESD protection for the analog inputs. The operating range for the analog inputs is 0V to VA. Going beyond this range will cause the ESD diodes to conduct and result in erratic operation. The capacitor C1 in Figure 7 has a typical value of 3 pF and is mainly the package pin capacitance. Resistor R1 is the on resistance of the multiplexer and track / hold switch; it is typically 500 Ω. Capacitor C2 is the ADC sampling capacitor; it is typically 30 pF. The ADC will deliver best performance when driven by a low-impedance source (less than 100 Ω). This is especially important when sampling dynamic signals. Also important when sampling dynamic signals is a band-pass or low-pass filter which reduces harmonic and noise in the input. These filters are often referred to as anti-aliasing filters. Figure 7. Equivalent Input Circuit DIGITAL INPUTS AND OUTPUTS The digital input signals have an operating range of 0V to VA, where VA = VDDA - VSSA. They are not prone to latch-up and may be asserted before the digital supply VD, where VD = VDDD - VSSD, without any risk. The digital output signals operating range is controlled by VD. The output high voltage is VD – 0.5V (min) while the output low voltage is 0.4V (max). Copyright © 2010–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: SM72441 |
Codice articolo simile - SM72441_15 |
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Descrizione simile - SM72441_15 |
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