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SM72442 데이터시트(PDF) 8 Page - Texas Instruments |
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SM72442 데이터시트(HTML) 8 Page - Texas Instruments |
8 / 21 page VOUT_MAX = 5 x RB1 RT1 + RB1 x (RFB1 + RFB2) RFB2 SM72442 SNVS689H – OCTOBER 2010 – REVISED APRIL 2013 www.ti.com STARTUP SM72442 has a soft start feature that will ramp its output voltage for a fixed time of 250ms. If no output current is detected during soft-start time, the chip will then be in Panel Mode for 60 seconds. A counter will start once the minimum output current threshold is met (set by ADC input channel 4). During these 60 seconds, any variation on the output power will not cause the chip to enter MPPT mode. Once 60 seconds have elapsed, at a certain power level variation at the output (set by ADC input channel 2) will engage the chip in MPPT mode. If the output current exceeded the current threshold set at A/D Channel 6 (A6) during soft-start, the chip will then engage in MPPT mode. Figure 5. Startup Sequence MAXIMUM OUTPUT VOLTAGE Maximum output voltage on the SM72442 is set by resistor divider ratio on pin A0. (Please refer to Figure 2 Typical Application Circuit). where • RT1 and RB1 are the resistor divider on the ADC pin A0 • RFB1 and RFB2 are the output voltage sense resistors. A typical value for RFB2 is about 2 k Ω (1) CURRENT LIMIT SETTING Maximum output current can be set by changing the resistor divider on A4 (pin 18). Refer to Figure 2. Overcurrent at the output is detected when the voltage on AIOUT (pin 21) equals the voltage on A4 (pin 18). The voltage on A4 can be set by a resistor divider connected to 5V whereas the voltage on AIOUT can be set by a current sense amplifier. AVIN PIN AVIN is an A/D input to sense the input voltage of the SM72442. A resistor divider can be used to scale max voltage to about 4V, which is 80% of the full scale of the A/D input. CONFIGURABLE SETTINGS A/D pins A0, A2, A4, and A6 are used to configure the behavior of the SM72442 by adjusting the voltage applied to them. One way to do this is through resistor dividers as shown in Figure 2, where RT1 to RT4 should be in the range of 20 k Ω. 8 Submit Documentation Feedback Copyright © 2010–2013, Texas Instruments Incorporated Product Folder Links: SM72442 |
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