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AN78L06 Datasheet(PDF) 10 Page - Panasonic Semiconductor |
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AN78L06 Datasheet(HTML) 10 Page - Panasonic Semiconductor |
10 / 12 page AN78Lxx/AN78LxxM Series 10 SFF00005CEB I Usage Notes 1. Cautions for a basic circuit CI: When a wiring from a smoothing circuit to a three-pin regulator is long, it is likely to oscillate at output. A capacitor of 0.1 µF to 0.47 µF should be connected near an input pin. CO: When any sudden change of load current is likely to occur, connect an electrolytic capacitor of 10 µF to 100µF to improve a transitional response of output voltage. Di: Normally unnecessary. But add it in the case that there is a residual voltage at the output capacitor Co even after switching off the supply power because a current is likely to flow into an output pin of the IC and damage the IC. 2. Other caution items 1) Short-circuit between the input pin and GND pin If the input pin is short-circuitted to GND or is cut off when a large capacitance capacitor has been con- nected to the IC's load, a voltage of a capacitor con- nected to an output pin is applied between input/out- put of the IC and this likely results in damage of the IC. It is necessary, therefore, to connect a diode, as shown in figure 2, to counter the reverse bias between input/output pins. 2) Floating of GND pin If a GND pin is made floating in an operating mode, an unstabilized input voltage is outputted. In this case, a thermal protection circuit inside the IC does not normally operate. In this state, if the load is short-circuited or overloaded, it is likely to damage the IC. I Application Circuit Examples Figure 1 CO VO CI VI Di 1 3 2 In GND Out Figure 2 CO 出力 1 3 2 − + I Basic Regulator Circuit CO CI Input Output AN78Lxx 12 3 CI is necessary when the input line is long. CO improves the transient response. VO VO 0.33 µF 0.1 µF VI VI IO IBias VO = VO' + IBias + R1 Note) VO varies due to sample to sample variation of IBias . Never fail to adjust individually with R1 . R2 VO' 20 Ω Q1 AN78Lxx AN78Lxx 1 3 2 1 2 3 R2 R1 VO' |
Similar Part No. - AN78L06 |
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Similar Description - AN78L06 |
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