전자부품 데이터시트 검색엔진 |
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TC1121EUA 데이터시트(PDF) 6 Page - Microchip Technology |
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TC1121EUA 데이터시트(HTML) 6 Page - Microchip Technology |
6 / 14 page TC1121 DS21358B-page 6 2002 Microchip Technology Inc. 3.4 Cascading Devices To produce greater negative magnitudes of the initial supply voltage, the TC1121 may be cascaded (see Figure 3-2). Resulting output resistance is approxi- mately equal to the sum of individual TC1121 ROUT values. The output voltage (where n is an integer representing the number of devices cascaded) is defined by VOUT = -n (VIN). 3.5 Paralleling Devices To reduce output resistance, multiple TC1121s may be paralleled (see Figure 3-3). Each device needs a pump capacitor C1, but the reservoir capacitor C2 serves all devices. The value of C2 should be increased by a factor of n (the number of devices). FIGURE 3-2: CASCADING TC1121s TO INCREASE OUTPUT VOLTAGE FIGURE 3-3: PARALLELING TC1121s TO REDUCE OUTPUT RESISTANCE 1 1n 8 7 2 N 2n C1121 C1121 ND ND SC SC AP AP AP AP C C HDN UT UT N UT VIN HDN HDN* HDN* SHDN should be tied to VIN if ot used. 1" n" C1 1n 2 2 N C1121 C1121 ND ND SC SC CAP+ AP AP AP FC C HDN UT UT N HDN HDN* HDN* IN if not used. 1" n" SC UT = R UT of TC1121)/n(number of devices) |
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