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TC1121COA Datasheet(PDF) 7 Page - Microchip Technology |
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TC1121COA Datasheet(HTML) 7 Page - Microchip Technology |
7 / 14 page 2002 Microchip Technology Inc. DS21358B-page 7 TC1121 3.6 Combined Positive Supply Multiplication and Negative Voltage Conversion Figure 3-4 shows this dual function circuit, in which capacitors C1 and C2 perform pump and reservoir functions to generate negative voltage. Capacitors C3 and C4 are the respective capacitors for multiplied positive voltage. This particular configuration leads to higher source impedances of the generated supplies due to the finite impedance of the common charge-pump driver. FIGURE 3-4: COMBINED POSITIVE MULTIPLER AND NEGATIVE CONVERTER 1 1 2 1, D2 = 1N4148 2 4 3 VIN + UT = (2VIN) – V ) – (VFD2) C1121 ND SC AP AP C HDN UT N HDN* UT = VIN – SHDN should be tied to VIN if not used. |
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