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TC1121 Datasheet(PDF) 6 Page - Microchip Technology |
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TC1121 Datasheet(HTML) 6 Page - Microchip Technology |
6 / 14 page TC1121 DS21358C-page 6 © 2006 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 C1 C1n 4 4 3 2 3 5 8 8 7 5 2 C2 VIN + C2n TC1121 TC1121 GND GND OSC OSC CAP+ CAP+ CAP– CAP– FC FC SHDN VOUT VOUT VIN VOUT VIN SHDN SHDN* SHDN* “1” “n” + + + + *SHDN should be tied to VIN if not used. C1 C1n 4 4 3 2 3 5 8 8 7 5 2 C2 V+IN TC1121 TC1121 GND GND OSC OSC CAP+ CAP+ CAP– CAP– FC FC SHDN VOUT VOUT VIN VIN SHDN SHDN* SHDN* *SHDN should be tied to VIN if not used. “1” “n” + + + 7 OSC ROUT = ROUT (of TC1121)/n(number of devices) |
Número de pieza similar - TC1121_06 |
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Descripción similar - TC1121_06 |
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