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S-19200A Datasheet(PDF) 13 Page - ABLIC Inc. |
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S-19200A Datasheet(HTML) 13 Page - ABLIC Inc. |
13 / 37 page AUTOMOTIVE, 105°C OPERATION, 50 V INPUT, 200 mA VOLTAGE REGULATOR Rev.2.2_00 S-19200A/BxxH Series 13 3. ON / OFF pin This pin starts and stops the regulator. When the ON / OFF pin is set to OFF level, the entire internal circuit stops operating, and the built-in P-channel MOS FET output transistor between the VIN pin and the VOUT pin is turned off, reducing current consumption significantly. The VOUT pin is set to the VSS level by the internal dividing resistor of several M Ω between the VOUT pin and the VSS pin. Note that the current consumption increases when a voltage of 0.3 V to VIN − 0.3 V is applied to the ON / OFF pin. The ON / OFF pin is configured as shown in Figure 11. Since the ON / OFF pin is neither pulled down nor pulled up internally, do not use it in the floating status. When not using the ON / OFF pin, connect it to the VSS pin in the product A type, and connect it to the VIN pin in the B type. Table 9 Product Type ON / OFF Pin Internal Circuit VOUT Pin Voltage Current Consumption A "L": ON Operate Set value ISS1 A "H": OFF Stop VSS level ISS2 B "L": OFF Stop VSS level ISS2 B "H": ON Operate Set value ISS1 VSS ON / OFF VIN Figure 11 4. Overcurrent protection circuit The S-19200A/BxxH Series includes an overcurrent protection circuit having the characteristics shown in "1. Output voltage vs. Output current (When load current increases) (Ta = +25°C)" in " Characteristics (Typical Data)", in order to protect the output transistor against an excessive output current and short circuiting between the VOUT pin and the VSS pin. The current when the output pin is short-circuited (Ishort) is internally set at approx. 80 mA typ., and the normal value is restored for the output voltage, if releasing a short circuit once. Caution This overcurrent protection circuit does not work as for thermal protection. If this IC long keeps short circuiting inside, pay attention to the conditions of input voltage and load current so that, under the usage conditions including short circuit, the loss of the IC will not exceed the power dissipation. |
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