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SJ1117-18PI Datasheet(PDF) 9 Page - KODENSHI_AUK CORP. |
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SJ1117-18PI Datasheet(HTML) 9 Page - KODENSHI_AUK CORP. |
9 / 18 page KSD-I0T005-008 9 SJ1117xxx ◈ Application Note Load Regulation Load regulation will be limited by the resistance of the wire connecting the regulator to the load. The specification for load regulation is measured at the output pin of the device. Negative side sensing is a true Kelvin connection, with the bottom of the output divider returned to the negative side of the load. Although it may not be immediately obvious, best load regulation is obtained when the top of the resistor divider (R1) is returned directly to the output pin of the device(See Fig.10). For example, a 5V regulator with 0.05Ω resistance(Rp) between the regulator and load will have a load regulation due to line resistance of (Rp x IL). If R1 is connected near the load, the effective line resistance will be Rp (1+R2/R1) or in this case, it is 4 times worse. In addition, the ground side of the resistor R2 can be returned near the ground of the load to provide remote ground sensing and improve load regulation. Protection Diodes Diodes between input and output are not usually needed. The internal diode between the output and input pins of the device can withstand microsecond surge currents of 10A to 20A. Normal power supply cycling can not generate currents of this magnitude. Only with extremely large output capacitors, such as 1000μF and larger, and with the input pin instantaneously shorted to ground can damage occur. A crowbar circuit at the input of the SJ1117 in combination with a large output capacitor could generate currents large enough to cause damage. In this case a diode from output to input is recommended, as shown in Figure 11. Fig.14 Connections for Best Load Regulation Fig.15 Protection Diodes SJ1117 IN OUT ADJ VIN VOUT + 100uF 1N4002 (OPTIONAL) COUT R1 R2 + 10uF CADJ |
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