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S19243XXXH Datasheet(PDF) 27 Page - Seiko Instruments Inc |
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S19243XXXH Datasheet(HTML) 27 Page - Seiko Instruments Inc |
27 / 74 page FOR AUTOMOTIVE 105 °C OPERATION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR WITH SOFT-START FUNCTION Rev.3.1_00 S-19243xxxH Series 27 Operation 1. Basic operation Figure 29 shows the block diagram of the S-19243xxxH Series to describe the basic operation. The error amplifier compares the feedback voltage (Vfb) whose output voltage (VOUT) is divided by the feedback resistors (Rs and Rf) with the reference voltage (Vref). The error amplifier controls the output transistor, consequently, the regulator starts the operation that keeps VOUT constant without the influence of the input voltage (VIN). VOUT *1 VSS VIN Rs Rf Error amplifier Current supply Vref Vfb − + Reference voltage circuit *1. Parasitic diode Figure 29 2. Output transistor In the S-19243xxxH Series, a low on-resistance P-channel MOS FET is used between the VIN pin and the VOUT pin as the output transistor. In order to keep VOUT constant, the on-resistance of the output transistor varies appropriately according to the output current (IOUT). Caution Since a parasitic diode exists between the VIN pin and the VOUT pin due to the structure of the transistor, the IC may be damaged by a reverse current if VOUT becomes higher than VIN. Therefore, be sure that VOUT does not exceed VIN + 0.3 V. |
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