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TC1222ECH 데이터시트(PDF) 8 Page - Microchip Technology |
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TC1222ECH 데이터시트(HTML) 8 Page - Microchip Technology |
8 / 16 page TC1221/TC1222 DS21367B-page 8 2002 Microchip Technology Inc. 4.9 Voltage Doubler/Inverter Another common application of the TC1221/TC1222 is shown in Figure 4-6. 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 40mA. 4.10 Diode Protection for Heavy Loads When heavy loads require the OUT pin to sink large currents being delivered by a positive source, diode protection may be needed. The OUT pin should not be allowed to be pulled above ground. This is accomplished by connecting a Schottky diode (1N5817) as shown in Figure 4-7. 4.11 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. Noise leakage into other circuitry can be minimized with the use of a large ground plane. FIGURE 4-6: COMBINED DOUBLER AND INVERTER FIGURE 4-7: HIGH V– LOAD CURRENT C1 D1 D2 D1, D2 = 1N4148 6 4 1 2 3 C2 C4 C3 VIN VOUT = -VIN VOUT = (2VIN) – (VFD1) – (VFD2) TC1221 TC1222 Shutdown Control 5 + + + + TC1221 TC1222 GND OUT 4 1 |
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