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TC1221ECH Scheda tecnica(PDF) 4 Page - Microchip Technology |
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TC1221ECH Scheda tecnica(HTML) 4 Page - Microchip Technology |
4 / 16 page TC1221/TC1222 DS21367B-page 4 2002 Microchip Technology Inc. 3.0 DETAILED DESCRIPTION The TC1221/TC1222 charge pump converters invert the voltage applied to the VIN pin. Conversion consists of a two-phase operation (Figure 3-1). During the first phase, switches S2 and S4 are opened and S1 and S3 are closed. During this time, C1 charges to the voltage on VIN and load current is supplied from C2. During the second phase, S2 and S4 are closed, and S1 and S3 are opened. This action connects C1 across C2, restoring charge to C2. FIGURE 3-1: IDEAL SWITCHED CAPACITOR CHARGE PUMP VOUT = – (VIN) C1 C2 TC1221/1222 Phase 1 VIN S1 S3 S4 S2 OSC |
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