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TC7662AMJA データシート(PDF) 7 Page - Microchip Technology |
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TC7662AMJA データシート(HTML) 7 Page - Microchip Technology |
7 / 16 page 2001-2012 Microchip Technology Inc. DS21468B-page 7 TC7662A 4.2 Output Ripple ESR also affects the ripple voltage seen at the output. The total ripple is determined by 2 voltages, A and B, as shown in Figure 4-2. Segment A is the voltage drop across the ESR of CR at the instant it goes from being charged by CP (current flowing into CR) to being dis- charged through the load (current flowing out of CR). The magnitude of this current change is 2 x IOUT, hence the total drop is 2 x IOUT x ESRCR volts. Segment B is the voltage change across CR during time t2, the half of the cycle when CR supplies current to the load. The drop at B is IOUT x t2/CR volts. The peak-to-peak ripple voltage is the sum of these voltage drops: FIGURE 4-2: OUTPUT RIPPLE 4.3 Paralleling Devices Any number of TC7662A voltage converters may be paralleled to reduce output resistance (Figure 4-3). The reservoir capacitor, CR, serves all devices, while each device requires its own pump capacitor, CP. The resultant output resistance would be approximately: 4.4 Cascading Devices The TC7662A may be cascaded as shown (Figure 4-4) to produce larger negative multiplication of the initial supply voltage. However, due to the finite efficiency of each device, the practical limit is 10 devices for light loads. The output voltage is defined by: VOUT = – n (VIN) where n is an integer representing the number of devices cascaded. The resulting output resistance would be approximately the weighted sum of the individual TC7662A ROUT values. FIGURE 4-3: PARALLELING DEVICES LOWERS OUTPUT IMPEDANCE FIGURE 4-4: INCREASED OUTPUT VOLTAGE BY CASCADING DEVICES 1 2 x fPUMP x CR VRIPPLE ( + 2 x ESRCR x IOUT) t2 t1 B A V 0 -(VDD) ROUT = ROUT (of TC7662A) n (number of devices) 1 2 3 4 8 7 6 5 TC7662A VDD 1 2 3 4 8 7 6 5 TC7662A RL C2 C1 "n" "1" + C1 1 2 3 4 8 7 6 5 VDD 1 2 3 4 8 7 6 5 10 μF 10 μF "n" "1" 10 μF V OUT* + + + TC7662A TC7662A *VOUT = -nVDD 10 μF |
同様の部品番号 - TC7662AMJA |
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同様の説明 - TC7662AMJA |
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