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TC1237EUN датащи(PDF) 5 Page - Microchip Technology |
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TC1237EUN датащи(HTML) 5 Page - Microchip Technology |
5 / 10 page 5 TC1235 TC1236 TC1237 Inverting Dual (–VIN, –2VIN) Charge Pump Voltage Converters with Shutdown TC1235/6/7-1 3/24/00 © 2001 Microchip Technology Inc. DS21371A Input Supply Bypassing TheVIN input should be capacitively bypassed to reduce AC impedance and minimize noise effects due to the switch- ing internal to the device. It is recommended that a large value capacitor (at least equal to C1) be connected from VIN to GND for optimal circuit performance. Shutdown Input The TC12351/1236/1237 is enabled when /SHDN is high, and disabled when /SHDN is low. This input cannot be allowed to float. (If /SHDN is not required, see the TC1225/ 1226/1227 data sheet.) The /SHDN input should be limited to 0.3V above VIN to avoid significant current flows. Dual Voltage Inverter The most common application for the TC1235/1236/ 1237 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. TC1235 DEMO Card The TC1235 DEMO Card is a 2.0” x 2.0” card containing both a TC1235 and two cascaded TC1219s 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 TC1235 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. TC1235 DEMO Card Test Points TEST POINT VOLTAGE MEASUREMENT TP1 VIN [+5V] TP2 GROUND TP3 GROUND TP4 TC1219 U1 OUTPUT [-5V(1)] TP5 TC1219 U2 OUTPUT [-10V(1)] TP6 TC1235 STAGE 1 OUTPUT [-5V(2)] TP7 TC1235 STAGE 2 OUTPUT [-10V(2)] TP8 EXTERNAL /SHDN INPUT TP9 TC1219 U1 /SHDN INPUT TP10 TC1235 U3 /SHDN INPUT Table 4. TC1235 DEMO Card Jumpers JUMPER CURRENT MEASUREMNT J1 DUAL TC1219 QUIESCENT CURRENT J2 TC1235 QUIESCENT CURRENT J3 TC1219 U1 [-5V(1)] LOAD CURRENT J4 TC1219 U2 [-10V(1)] LOAD CURRENT J5 TC1235 STAGE 1 [-5V(2)] LOAD CURRENT J6 TC1235 STAGE 2 [-10V(2)] LOAD CURRENT J7 TC1219 U1 /SHDN INPUT CURRENT J8 TC1235 U3 /SHDN INPUT CURRENT J9 GROUND EXTERNAL /SHDN INPUT C1 C2 V IN C IN R L1 V OUT1 V OUT2 R L2 –V IN V IN C OUT1 C OUT2 –2V IN TC1235 TC1236 TC1237 C1– SHDN C2– 2 1 9 7 8 10 5 6 4 C1+ C2+ GND Device CIN C1 C2 COUT1 COUT2 TC1235 3.3 µF 3.3µF 1 µF 3.3 µF 1 µF TC1236 1 µF 1 µF 0.33µF 1 µF 0.33 µF TC1237 0.33 µF 0.33µF 0.1 µF 0.33µF 0.1 µF |
Аналогичный номер детали - TC1237EUN |
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Аналогичное описание - TC1237EUN |
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