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TC1221 Datasheet(PDF) 7 Page - Microchip Technology |
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TC1221 Datasheet(HTML) 7 Page - Microchip Technology |
7 / 16 page 2002 Microchip Technology Inc. DS21367B-page 7 TC1221/TC1222 4.7 Cascading Devices Two or more TC1221/TC1222 can be cascaded to increase output voltage (Figure 4-4). If the output is lightly loaded, it will be close to (-2 x VIN) but will droop at least by ROUT of the first device multiplied by the IQ of the second. It can be seen that the output resistance rises rapidly for multiple cascaded devices. 4.8 Paralleling Devices To reduce the value of ROUT, multiple TC1221/ TC1222’s can be connected in parallel (Figure 4-5). The output resistance will be reduced by a factor of N where N is the number of TC1221/TC1222. Each device will require its own pump capacitor (C1), but all devices may share one reservoir capacitor (C2). However, to preserve ripple performance the value of C2 should be scaled according to the number of paralleled TC1221/TC1222. FIGURE 4-4: CASCADING MULTIPLE DEVICES TO INCREASE OUTPUT VOLTAGE FIGURE 4-5: PARALLELING MULTIPLE DEVICES TO REDUCE OUTPUT RESISTANCE C1 C1 C2 6 6 4 3 4 1 2 2 1 3 C2 VIN VOUT VOUT =-nVIN TC1221 TC1222 TC1221 TC1222 ... ... SHDN SHDN VIN 5 5 "1" "n" + + + + C1 C1 6 5 4 3 4 1 2 2 1 3 C2 VOUT VOUT =-VIN ROUT = ROUT OF SINGLE DEVICE VIN NUMBER OF DEVICES TC1221 TC1222 TC1221 TC1222 ... ... SHDN SHDN Shutdown Control 5 6 VIN + + + "1" "n" |
Número de pieza similar - TC1221 |
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Descripción similar - TC1221 |
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