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S-812C21AMC-C2B-T2 Datasheet(PDF) 7 Page - Seiko Instruments Inc |
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S-812C21AMC-C2B-T2 Datasheet(HTML) 7 Page - Seiko Instruments Inc |
7 / 26 page Rev.1.0 HIGH OPERATING VOLTAGE CMOS VOLTAGE REGULATOR S-812C Series Seiko Instruments Inc. 7 5. Dropout voltage (Vdrop) This parameter indicates the difference between the input voltage (VIN1) and the output voltage when output voltage falls to 98 % of VOUT (E) by gradually decreasing the input voltage (VIN). Vdrop = VIN1-[VOUT(E) × 0.98] 6. Temperature coefficient of output voltage [ ∆V OUT/( ∆Ta • V OUT)] The output voltage lies in the shaded area in the whole operating temperature shown in figure 8 when the temperature coefficient of the output voltage is ±100 ppm/°C. -40 25 +0.30mV/ °C VOUT [V] VOUT (E) is a measured value of output voltage at 25 °C. VOUT(E) 85 Ta [ °C] -0.30mV/ °C Figure 8 Example for the S-812C30A Temperature change ratio for output voltage [mV/°C] is calculated by using the following equation. [] [ ] [] ∆ ∆ ∆ ∆ V Ta mV/ C V (S) V V Ta V ppm/ C 1000 OUT OUT OUT OUT °= × • °÷ Description of Operation 1. Basic operation Figure 9 shows the block diagram of the S-812C series. The error amplifier compares a reference voltage Vref with a part of the output voltage divided by the feedback resistors Rs and Rf, and supplies the gate voltage to the output transistor, necessary to ensure certain output voltage independent from change of input voltage and temperature. 2. Output transistor The S-812C Series uses a Pch MOS transistor as the output transistor. The voltage at VOUT must not exceed VIN+0.3V. When the VOUT voltage becomes higher than that of VIN, reverse current flows and may break the regulator since a parasitic diode between VOUT and VIN exists inevitably. Reference voltage VOUT * * : Parasitic diode VSS VIN Rs Rf Figure 9 Block Diagram Error amplifier Current source Vref Specified output voltage Output voltage temperature coefficient Temperatures change ratio for output voltage |
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