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TC1227 Datasheet(PDF) 5 Page - Microchip Technology |
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TC1227 Datasheet(HTML) 5 Page - Microchip Technology |
5 / 9 page 5 TC1225 TC1226 TC1227 TC1225/6/7-1 3/24/00 Inverting Dual (–VIN, –2VIN) Charge Pump Voltage Converters © 2001 Microchip Technology Inc. DS21369A Dual Voltage Inverter The most common application for the TC1225/1226/ 1227 devices is the dual voltage inverter (Figure 2). This application uses four external capacitors: C1, C2, COUT1, and COUT2 (NOTE: a power supply bypass capacitor is recommended). The outputs are equal to – VIN and –2VIN plus any voltage drops due to loading. Refer to Tables 1a, 1b, 2a, and 2b for capacitor selection guidelines. Figure 2. Dual Voltage Inverter Test Circuit 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. TC1225 DEMO CARD The TC1225 DEMO Card is a 2.0” x 2.0” card containing both a TC1225 and two cascaded TCM828s that allow the user to compare the operation of each approach for gener- ating a –1X and –2X function. Each circuit is fully assembled with the required external capacitors along with variable load resistors that allow the user to vary the output load current of each stage. For convenience, several test points and jumpers are available for measuring various voltages and currents on the demo board. Figure 3 is a schematic of the TC1225 DEMO Card, and Figure 4 shows the assembly drawing and artwork for the board. Table 3 lists the voltages that are monitored by the test points and Table 4 lists the currents that can be measured using the jumpers. Table 3. TC1225 DEMO Card Test Points TEST POINT VOLTAGE MEASUREMENT TP1 VIN [+5V] TP2 GROUND TP3 GROUND TP4 TCM828 U1 OUTPUT [-5V(1)] TP5 TCM828 U2 OUTPUT [-10V(1)] TP6 TC1225 STAGE 1 OUTPUT [-5V(2)] TP7 TC1225 STAGE 2 OUTPUT [-10V(2)] Table 4. TC1225 DEMO Card Jumpers JUMPER CURRENT MEASUREMNT J1 DUAL TCM828 QUIESCENT CURRENT J2 TC1225 QUIESCENT CURRENT J3 TCM828 U1 [-5V(1)] LOAD CURRENT J4 TCM828 U2 [-10V(1)] LOAD CURRENT J5 TC1225 STAGE 1 [-5V(2)] LOAD CURRENT J6 TC1225 STAGE 2 [-10V(2)] LOAD CURRENT C1 C2 V IN C IN R L1 V OUT1 V OUT2 R L2 –V IN V IN C OUT1 C OUT2 –2V IN TC1225 TC1226 TC1227 C1– C2– 2 1 7 6 8 4 5 3 C1+ C2+ GND Device CIN C1 C2 COUT1 COUT2 TC1225 3.3 µF 3.3µF 1 µF 3.3 µF 1 µF TC1226 1 µF 1 µF 0.33µF 1 µF 0.33 µF TC1227 0.33 µF 0.33µF 0.1 µF 0.33µF 0.1 µF |
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