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TC1240AECH bảng dữ liệu(PDF) 10 Page - Microchip Technology |
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10 / 18 page TC1240/TC1240A DS21516D-page 10 2001-2012 Microchip Technology Inc. 5.7 Cascading Devices Two or more TC1240/TC1240As can be cascaded to increase output voltage (Figure 5-4). If the output is lightly loaded, it will be close to ((n + 1) 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. For the case of the two-stage ‘tripler’, output resistance can be approximated as ROUT = 2 x ROUT1 + ROUT2, where ROUT1 is the output resistance of the first stage and ROUT2 is the output resistance of the second stage. 5.8 Paralleling Devices To reduce the value of ROUT, multiple TC1240/ TC1240As can be connected in parallel (Figure 5-5). The output resistance will be reduced by a factor of N, where N is the number of TC1240/TC1240As. Each device will require its own pump capacitor (C1x), 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 paralled TC1240/TC1240As, respectively. 5.9 Layout Considerations As with any switching power supply circuit good layout practice is recommended. Mount components as close together as possible to minimize stray inductance and capacitance. Also use a large ground plane to minimize noise leakage into other circuitry. FIGURE 5-4: Cascading Multiple Devices To Increase Output Voltage. FIGURE 5-5: Paralleling Multiple Devices To Reduce Output Resistance. "n" C+ GND C- OUT 3 2 5 1 6 TC1240 TC1240A SHDN 4 VIN C+ GND C- OUT C1A 3 2 5 1 6 C2B VIN VOUT VOUT = (n + 1)VIN TC1240 TC1240A SHDN 4 "1" + + + VIN C1B C2A + C1A C1B 6 4 2 3 2 5 1 1 5 3 C2 VOUT VOUT = 2 x VIN ROUT = ROUT OF SINGLE DEVICE VIN NUMBER OF DEVICES TC1240 TC1240A TC1240 TC1240A . . . . . . SHDN SHDN Shutdown Control 4 6 VIN + + + "1" "n" |
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