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TC7660SMJA Datasheet(PDF) 4 Page - TelCom Semiconductor, Inc |
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TC7660SMJA Datasheet(HTML) 4 Page - TelCom Semiconductor, Inc |
4 / 8 page 4-72 TELCOM SEMICONDUCTOR, INC. TC7660S SUPER CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER The output characteristics of the circuit in Figure 3 are those of a nearly ideal voltage source in series with 70 Ω. Thus, for a load current of –10mA and a supply voltage of +5V, the output voltage would be –4.3V. The dynamic output impedance of the TC7660S is due, primarily, to capacitive reactance of the charge transfer capacitor (C1). Since this capacitor is connected to the output for only 1/2 of the cycle, the equation is: Paralleling Devices Any number of TC7660S voltage converters may be paralleled to reduce output resistance (Figure 4). The reser- voir capacitor, C2, serves all devices, while each device requires its own pump capacitor, C1. The resultant output resistance would be approximately: 2 2 πf C1 XC = = 3.18 Ω, where f = 10kHz and C1 = 10µF. Figure 4. Paralleling Devices Lowers Output Impedance Dos and Don'ts • Do not exceed maximum supply voltages. • Do not connect the LV terminal to GND for supply voltages greater than 3.5V. • Do not short circuit the output to V + supply for voltages above 5.5V for extended periods; however, transient conditions including start-up are okay. • When using polarized capacitors in the inverting mode, the + terminal of C1 must be connected to pin 2 of the TC7660S and the + terminal of C2 must be connected to GND. Simple Negative Voltage Converter Figure 3 shows typical connections to provide a nega- tive supply where a positive supply is available. A similar scheme may be employed for supply voltages anywhere in the operating range of +1.5V to +12V, keeping in mind that pin 6 (LV) is tied to the supply negative (GND) only for supply voltages below 3.5V. Figure 3. Simple Negative Converter 1 2 3 4 8 7 6 5 TC7660S V + 1 2 3 4 8 7 6 5 TC7660S C1 RL C2 C1 "n" "1" + 1 2 3 4 8 7 6 5 TC7660S 10µF + V + 10µF + VOUT* NOTES: * C1 C2 ROUT (of TC7660S) n (number of devices) ROUT = |
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