The MAX/ICL combine low quiescent current and . The Maxim ICL can also be used with an external output diode in series with pin 5 ( cathode. The Intersil ICL and ICLA are monolithic CMOS power supply circuits which offer unique performance advantages over previously. Overview; Documentation; Download; Ordering The Intersil ICL and ICLA are monolithic CMOS power supply circuits which offer unique.
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The ICL performs supply voltage conversions from positive to negative for an The ICL can also be connected to function as voltage doublers and will . Download datasheet · TLV Single Output LDO, mA, Fixed and Adj., Internal Current limit, Thermal Overload Protection · Download datasheet. ICLMAX - Download as PDF File .pdf), Text File .txt) or read online. ICL
This assures latchup free operation. The oscillator, when unloaded, oscillates at a nominal frequency of khz for an input supply voltage of.
This frequency can be lowered by the addition of an external capacitor to the OSC terminal, or the oscillator may be overdriven by an external clock. At medium to high voltages. V ICLA Copyright Intersil Americas Inc. V Note V CurrentintoLV Note This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
Connecting any input terminal to voltages greater than V or less than GND may cause destructive latchup. Derate linearly above o Cby. In the test circuit, there is no external capacitor applied to pin. However, when the device is plugged into a test socket, there is usually a very small but finite stray capacitance present, of the order of pf..
This device will function in existing designs which incorporate an external diode with no degradation in overall circuit performance. These curves include in the supply current that current fed directly into the load R L from the V See Figure.
The mode of operation of the device may be best understood by considering Figure, which shows an idealized negative voltage converter. Capacitor C is charged to a voltage, V, for the half cycle when switches S and S are closed.
Note: Switches S and S are open during this half cycle. During the second half cycle of operation, switches S and S are closed, with S and S open, thereby shifting capacitor C negatively by V volts.
Charge is then transferred from C to C such that the voltage on C is exactly V, assuming ideal switches and no load on C. The ICL approaches this ideal situation more closely than existing nonmechanical circuits. The main difficulty with this approach is that in integrating the switches, the substrates of S and S must always remain reverse biased with respect to their sources, but not so much as to degrade their ON resistances. Failure to accomplish this would result in high power losses and probable device latchup.
I need model pspice of ICL7660 to Orcad
This problem is eliminated in the ICL and ICLA by a logic network which senses the output voltage together with the level translators, and switches the substrates of S and S to the correct level to maintain necessary reverse bias. For supply voltages greater than. The driver circuitry consumes minimal power.. The output switches have extremely low ON resistance and virtually no offset.. The impedances of the pump and reservoir capacitors are negligible at the pump frequency.
If the impedances of C and C are relatively high at the pump frequency refer to Figure compared to the value of R L, there will be a substantial difference in the voltages V and V. Therefore it is not only desirable to make C as large as possible to eliminate output voltage ripple, but also to employ a correspondingly large value for C in order to achieve maximum efficiency of operation.
Do s And Don ts. Do not exceed maximum supply voltages..
Do not short circuit the output to V supply for supply voltages above. User should insure that the output pin does not go more positive than GND pin.
DC negative voltage generator. In practice, the prototype circuit gives an output of In cases where very large step-up ratios are required as, for example, when hundreds of volts must be generated via a 6V to 12V supply , it is often better to use the output of a low-voltage oscillator or squarewave generator to drive a step-up voltage transformer, which then provides the required high-value voltage in AC form on its secondary output winding; this AC voltage can easily be converted back to DC via a simple rectifier-filter network.
Figure 10 shows a practical low-power high-voltage generator circuit of this type. The supply voltage is stepped up to about V peak at T1 secondary, and is half-wave rectified and smoothed via D1-C3. The IC can thus be used as either a negative-voltage generator or as a voltage doubler.
ICL7660, MAX1044 Switched-Capacitor Voltage Converters
On the next clock cycle, however, S1 toggles low and, under this condition, C1 is connected — in reverse polarity — directly across external output capacitor C2, thus generating an output voltage of V- across C2. This toggling sequence repeats continuously, at half of the clock-generator frequency. If the IC is to be used with supplies in the range 1.
At supply values greater than 6. The circuits of Figures 12 to 20 show a selection of practical designs in which these rules are applied. The Figure 12 voltage converter is intended for use with 1. DC negative-voltage generator or voltage doubler using 1. The Figure 13 circuit is similar, but is meant for use with supplies in the 3.
DC negative-voltage generator or voltage doubler using 3. Finally, the Figure 14 circuit is meant for use with supplies in the range 6. DC negative-voltage generator or voltage doubler using 6. The presence of this diode reduces the available output voltage by Vdf, the forward volt drop of the diode; to keep this volt drop to minimum values, D1 should be a germanium or Schottky type.
A useful feature of the ICL is that numbers of these ICs up to a maximum of 10 can be cascaded to give voltage conversion factors greater than unity.
ICL7660 DC to DC Converter from 5V to +/- 5V
Thus, if three stages are cascaded, they give a final negative output voltage of -3Vcc, etc. Figure 15 shows the connections for cascading two of these stages; any additional stages should be connected in the same way as the right-hand IC of this diagram. Cascading ICs for increased negative output voltage.
It has already been pointed out that a single ICL IC can be used as a highly efficient voltage doubler that can, for example, generate a centre-tapped 10V output when powered from a single-ended 5V input. Figure 16 shows how two of these ICs can be cascaded to generate a centre-tapped 12V output when the circuit is powered from a single-ended 3V source e. Cascaded ICs giving a centre-tapped 12V output from a 3V supply.
Here, IC1 is used as a basic voltage doubler, powered from a 3V source connected between pins 3 and 8, and its 6V output from between pins 5 and 8 is used to power IC2 via pins 3 and 8, and IC2 thus generates an output between pins 5 and 8 of 12V when very lightly loaded. This 12V output has a source impedance of about R, and falls by about 0.
Method of reducing oscillator frequency. Cx versus oscillator frequency graph. Another way of reducing the oscillator frequency is to use pin 7 to over-drive the oscillator via an external clock, as shown in Figure External clocking of the ICLDC negative-voltage generator or voltage doubler using 1. Charge pump type of voltage trebler.
This assures latchup free operation. This approach would be, for example, suitable for generating 9V and V from an existing V supply. The voltage thus created on C becomes V VF or twice the supply voltage minus the combined forward voltage drops of diodes D and D. The voltage value can be measured by the multimeter. Watch the output voltage and compare it with the formula. There is a penalty in this configuration which combines both functions, however, in that the source impedances of the generated supplies will be somewhat higher due to the finite impedance of the common charge pump driver at pin of the device.
The circuit of Figure can be used to overcome this by controlling the input voltage, via an ICL lowpower CMOS op amp, in such a way as to maintain a nearly constant output voltage.
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