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CS5206-1GT3 Folha de dados(PDF) 5 Page - Cherry Semiconductor Corporation |
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CS5206-1GT3 Folha de dados(HTML) 5 Page - Cherry Semiconductor Corporation |
5 / 7 page 5 The output or compensation capacitor helps determine three main characteristics of a linear regulator: start-up delay, load transient response and loop stability. The capacitor value and type is based on cost, availability, size and temperature constraints. A tantalum or aluminum electrolytic capacitor is best, since a film or ceramic capaci- tor with almost zero ESR, can cause instability. The alu- minum electrolytic capacitor is the least expensive solu- tion. However, when the circuit operates at low tempera- tures, both the value and ESR of the capacitor will vary considerably. The capacitor manufacturers data sheet pro- vides this information. A 22µF tantalum capacitor will work for most applications, but with high current regulators such as the CS5206 -X the transient response and stability improve with higher val- ues of capacitor. The majority of applications for this regu- lator involve large changes in load current so the output capacitor must supply the instantaneous load current. The ESR of the output capacitor causes an immediate drop in output voltage given by: ÆV = ÆI ´ ESR For microprocessor applications it is customary to use an output capacitor network consisting of several tantalum and ceramic capacitors in parallel. This reduces the overall ESR and reduces the instantaneous output voltage drop under load transient conditions. The output capacitor net- work should be as close as possible to the load for the best results. When large external capacitors are used with a linear regu- lator it is sometimes necessary to add protection diodes. If the input voltage of the regulator gets shorted, the output capacitor will discharge into the output of the regulator. The discharge current depends on the value of the capaci- tor, the output voltage and the rate at which VIN drops. In the CS5206-X family of linear regulators, the discharge path is through a large junction and protection diodes are not usually needed. If the regulator is used with large values of output capacitance and the input voltage is instantaneously shorted to ground, damage can occur. In this case, a diode connected as shown in Figures 2a and 2b is recommended. Figure 2a. Protection diode scheme for adjustable output regulator. Figure 2b. Protection diode scheme for fixed output regulators. Since the CS5206 -X is a three terminal regulator, it is not possible to provide true remote load sensing. Load regula- tion is limited by the resistance of the conductors connect- ing the regulator to the load. For best results the fixed reg- ulators should be connected as shown in Figure 3. Figure 3. Conductor parasitic resistance can be minimized with the above grounding scheme for fixed output regulators. For the adjustable regulator, the best load regulation occurs when R1 is connected directly to the output pin of the regulator as shown in Figure 4. If R1 is connected to the load, RC is multiplied by the divider ratio and the effective resistance between the regulator and the load becomes RC ´ () RC = conductor parasitic resistance Figure 4. Grounding scheme for the adjustable output regulator to min- imize parasitics. VOUT RC VIN conductor parasitic resistance CS5206-1 VIN Adj RLOAD R1 R2 R1 + R2 R1 VOUT RC VIN conductor parasitic resistance CS5206-X VIN Gnd RLOAD Output Voltage Sensing VOUT VIN CS5206-X VIN Gnd VOUT C2 C1 IN4002 (optional) VOUT VIN CS5206-1 VIN Adj R1 R2 C1 VOUT C2 CAdj IN4002 (optional) Protection Diodes Stability Considerations Applications Information: continued |
Nº de peça semelhante - CS5206-1GT3 |
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Descrição semelhante - CS5206-1GT3 |
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