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S-812C24AUA-C2E-T2 Datasheet(PDF) 8 Page - Seiko Instruments Inc |
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S-812C24AUA-C2E-T2 Datasheet(HTML) 8 Page - Seiko Instruments Inc |
8 / 26 page HIGH OPERATING VOLTAGE CMOS VOLTAGE REGULATOR Rev.1.0 S-812C Series 8 Seiko Instruments Inc. 3. Power-off function (ON/OFF pin) The ON/OFF pin controls the start and stop of the regulation operation. When the ON/OFF pin is set to power-off level, halting whole internal circuit and turning off the Pch MOSFET between VIN and VOUT, current consumption is drastically reduced. The voltage of the VOUT pin becomes VSS level due to the internal resistance divider of several M Ω between VOUT and VSS. The ON/OFF pin should not be left afloat since no pull-up nor pull-down is made internally as shown in figure 10. Note that the current consumption increases if a voltage between 0.3V and VIN-0.3V is applied to the ON/OFF pin. When the power-off function is not used, connect the pin to the VIN pin in case of positive logic and to the VSS pin in case of negative logic. Table 8 Power-off function Product type ON/OFF pin Internal circuit VOUT pin voltage Current consumption B “H” : Power on Operate Set value Iss B “L” : Power off Halt VSS level Iss2 When a regulation operation at light load less than 100uA is halted, output voltage may increase. If the increase of the output voltage should be avoided, pull down the VOUT pin to the VSS level as soon as ON/OFF pin goes to the power-down level. 4. Short-circuit protection Installation of the short-circuit protection which protects the output transistor against short-circuit between VOUT and VSS can be selected in the S-812C series. The short-circuit protection controls output current as shown in the typical characteristics, (1) OUTPUT VOLTAGE versus OUTPUT CURRENT, and suppresses output current at about 40 mA even if VOUT and VSS pins are short-circuited. The short-circuit protection can not at the same time be a thermal protection. Attention should be paid to the Input voltage and the load current under the actual condition so as not to exceed the power dissipation of the package including the case for short-circuit. When the output current is large and the difference between input and output voltage is large even if not shorted, the short-circuit protection may work and the output current is suppressed to the specified value. Products without short-circuit protection can provide comparatively large current by removing a short-circuit protection. Selection of External Components Output Capacitor (CL) The S-812C series can provide stable operation without output capacitor (CL) since the regulator has an internal phase compensation circuit to stabilize operation when the load changes. The transient response of the regulator, however, changes with the output capacitor and the magnitude of overshoot and undershoot on output voltage accordingly changes. Please refer to CL dependence data in “Transient Response Characteristics” to select suitable value for the capacitor. . When a tantalum or an aluminum electrolytic capacitor is used, the ESR of the capacitor shall be 10 Ω or less. When an aluminum electrolytic capacitor is used attention should be especially paid to since the ESR of the aluminum electrolytic capacitor increases at low temperature and possibility of oscillation becomes large. Sufficient evaluation including temperature characteristics is indispensable. VIN ON/OFF VSS Figure 10 |
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