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TC828A 데이터시트(PDF) 5 Page - TelCom Semiconductor, Inc |
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TC828A 데이터시트(HTML) 5 Page - TelCom Semiconductor, Inc |
5 / 8 page 5 TC828A Switched Capacitor Voltage Converters TC828A-1 5/1/00 Diode Protection for Heavy Loads When heavy loads require the OUT pin to sink large currents being delivered by a positive source, diode protec- tion may be needed. The OUT pin should not be allowed to be pulled above ground. This is accomplished by connect- ing a Schottky diode (1N5817) as shown in Figure 7. Layout Considerations As with any switching power supply circuit good layout practice is recommended. Mount components as close together as possible to minimize stray inductance and capacitance. Also use a large ground plane to minimize noise leakage into other circuitry. Voltage Doubler/Inverter Another common application of the TC828A is shown in Figure 6. This circuit performs two functions in combination. C1 and C2 form the standard inverter circuit described above. C3 and C4 plus the two diodes form the voltage doubler circuit. C1 and C3 are the pump capacitors and C2 and C4 are the reservoir capacitors. Because both sub- circuits rely on the same switches if either output is loaded, both will droop toward GND. Make sure that the total current drawn from both the outputs does not total more than 40 mA. Figure 6. Combined Doubler and Inverter Figure 7. High V– Load Current C1 D1 D2 D1, D2 = 1N4148 5 4 1 2 3 C2 C4 C3 V IN + V OUT = VIN – V OUT = (2VIN) – (V FD1) – (VFD2) TC828 TC828 GND OUT 4 1 Figure 5. Paralleling TC828As to Reduce Output Resistance C1 C1 5 5 4 3 4 1 2 2 1 3 C2 V OUT V OUT = VIN R OUT = R OUT OF SINGLE DEVICE V IN + NUMBER OF DEVICES – TC828 “1” TC828 “N” . . . . . . |
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