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ICL7660ACPA Datasheet(PDF) 11 Page - Intersil Corporation |
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ICL7660ACPA Datasheet(HTML) 11 Page - Intersil Corporation |
11 / 13 page 11 FN3179.7 January 23, 2013 Voltage Splitting The bidirectional characteristics can also be used to split a high supply in half, as shown in Figure 20. The combined load will be evenly shared between the two sides, and a high value resistor to the LV pin ensures start-up. Because the switches share the load in parallel, the output impedance is much lower than in the standard circuits, and higher currents can be drawn from the device. By using this circuit, and then the circuit of Figure 15, +15V can be converted, via +7.5 and -7.5, to a nominal -15V, although with rather high series output resistance ( ∼250Ω). Regulated Negative Voltage Supply In some cases, the output impedance of the ICL7660S and ICL7660A can be a problem, particularly if the load current varies substantially. The circuit of Figure 21 can be used to overcome this by controlling the input voltage, via an ICL7611 low-power CMOS op amp, in such a way as to maintain a nearly constant output voltage. Direct feedback is inadvisable, since the ICL7660S’s and ICL7660A’s output does not respond instantaneously to change in input, but only after the switching delay. The circuit shown supplies enough delay to accommodate the ICL7660S and ICL7660A, while maintaining adequate feedback. An increase in pump and storage capacitors is desirable, and the values shown provide an output impedance of less than 5 Ω to a load of 10mA. Other Applications Further information on the operation and use of the ICL7660S and ICL7660A may be found in application note AN051, “Principles and Applications of the ICL7660 CMOS Voltage Converter”. 1 2 3 4 8 7 6 5 ICL7660S V+ D1 D2 C4 VOUT = (2V+) - (VFD1) - (VFD2) + - C2 + - C3 + - VOUT = -VIN C1 + - FIGURE 19. COMBINED NEGATIVE VOLTAGE CONVERTER AND POSITIVE DOUBLER D3 ICL7660A 1 2 3 4 8 7 6 5 + - + - 50µF 50µF + - 50µF RL1 VOUT = V+ - V- 2 ICL7660S V+ V- RL2 FIGURE 20. SPLITTING A SUPPLY IN HALF ICL7660A 1 2 3 4 8 7 6 5 + - 100µF ICL7660S 100µF VOUT + - 10µF ICL7611 + - 100 Ω 50k +8V 100k 50k ICL8069 56k +8V 800k 250k VOLTAGE ADJUST + - FIGURE 21. REGULATING THE OUTPUT VOLTAGE ICL7660A ICL7660S, ICL7660A |
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