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TS3300ITQ1633 bảng dữ liệu(PDF) 10 Page - Silicon Laboratories |
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TS3300ITQ1633 bảng dữ liệu(HTML) 10 Page - Silicon Laboratories |
10 / 12 page TS3300 Page 10 TS3300 Rev. 1.0 Boost Input Anti-CrushTM Feature The TS3300 includes an anti-crushTM feature to prevent the collapse of the input voltage to the boost regulator when the input is a weak (high impedance) source. If the input voltage drops below a determined voltage threshold (settable by a resistor divider), the boost regulator switching cycles are paused, effectively limiting the minimum input voltage. Anti-crushTM is useful in applications where a buffer capacitor at the boost’s output can service burst loads, and the input source exhibits substantial source impedance (such as with an old battery, or at cold temperatures). To set the anti-crushTM voltage, a feedback pin (BI FB) in conjunction with a voltage divider circuit can be implemented as shown in Figure 4. The feedback pin voltage is 392mV. It is recommended to use large resistor values to minimize additional current draw at the input. Using the following equation to solve for R5 for a given R6 value, the output voltage can be set: R3= V ANTI-CRUSH TM - 0.392 R4 0.392 To set a 0.9V VANTI-CRUSHTM voltage with R4=1.37M Ω, R3 is calculated to be 1.78M Ω. The anti-crushTM voltage is to be set above the minimum input voltage specification of the TS3300. Figure 5 shows a scope capture of the load step response. The measurement was performed with the anti-crushTM voltage set to 0.9V. The output of the Boost Regulator is pulsed with a 100mA load every 100ms for 1ms as shown by the pink curve, the input voltage after a battery impedance of 10 Ω drops from 1.2V to 0.9V as shown by the blue curve and the boost output voltage drops by only 160mV as shown by the yellow curve. The TS3300 quickly replenishes the 500µF capacitor and the output of the boost regulator returns to 3V. Figure 6 shows a scope capture of the anti-crushTM feature in action at start-up under a heavy capacitive load of 500µF and an input source impedance of 10 Ω. A high source impedance is typical of a weak battery source. The measurement was performed with the anti-crushTM voltage set to 0.9V. The purple and blue traces represent the input current and boost output voltage respectively. At start-up, the current rises up to 50mA and drops to approximately 30mA for approximately 40ms in order to charge the output capacitor. At this point, the voltage to the input of the TS3300 is 0.9V until the boost output achieves regulation. Figure 4. Setting the Anti-CrushTM Voltage with a Voltage Divider Large Output Capacitor Start-up with VAnti-Crush TM=0.9V RIN=10Ω, VBI=1.2V, VBO= 3V, CBO=500µF Figure 6. Using Anti-CrushTM Feature at Start-up with Large Output Capacitor and a 10 Ω Input Impedance. Figure 5. Using Anti-CrushTM Feature to Maintain Output Regulation with Load Step Response Boost Load Step Response with VAnti-Crush TM=0.9V RIN=10Ω, VBI=1.2V, VBO= 3V, CBO=500µF, IBO=100mA |
Số phần tương tự - TS3300ITQ1633 |
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Mô tả tương tự - TS3300ITQ1633 |
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