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SM72441 Scheda tecnica(PDF) 9 Page - Texas Instruments

Il numero della parte SM72441
Spiegazioni elettronici  SM72441 Programmable Maximum Power Point Tracking Controller for Photovoltaic Solar Panels
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SM72441 Scheda tecnica(HTML) 9 Page - Texas Instruments

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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
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