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S-19243D12A-A8T1U Datasheet(PDF) 29 Page - ABLIC Inc. |
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S-19243D12A-A8T1U Datasheet(HTML) 29 Page - ABLIC Inc. |
29 / 74 page AUTOMOTIVE, 125°C OPERATION, 10 V INPUT, 500 mA VOLTAGE REGULATOR WITH SOFT-START FUNCTION Rev.3.2_00 S-19243xxxA Series 29 4. Discharge shunt function (S-19243xxxA Series A / B / E / F type) The S-19243xxxA Series A / B / E / F type has a built-in discharge shunt circuit to discharge the output capacitance. The output capacitance is discharged as follows so that the VOUT pin reaches the VSS level. (1) The ON / OFF pin is set to OFF level. (2) The output transistor is turned off. (3) The discharge shunt circuit is turned on. (4) The output capacitor discharges. Since the S-19243xxxA Series C / D / G / H type does not have a discharge shunt circuit, the VOUT pin is set to the VSS level through several hundred k Ω internal divided resistors between the VOUT pin and the VSS pin. The S-19243xxxA Series A / B / E / F type allows the VOUT pin to reach the VSS level rapidly due to the discharge shunt circuit. Output transistor: OFF ON / OFF pin: OFF VIN ON / OFF VSS ON / OFF circuit Discharge shunt circuit : ON VOUT *1 *1. Parasitic diode Current flow GND *1 S-19243xxxA Series Output capacitor (CL) Figure 32 5. Pull-down resistor (S-19243xxxA Series A / C / E / G type) The ON / OFF pin is internally pulled down to the VSS pin in the floating status, so the VOUT pin is set to the VSS level. Note that the IC's current consumption increases as much as current flows into the pull-down resistor of 4.0 M Ω typ. when the ON / OFF pin is connected to the VIN pin. |
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