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RT9164-25CL Datasheet(PDF) 8 Page - List of Unclassifed Manufacturers |
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RT9164-25CL Datasheet(HTML) 8 Page - List of Unclassifed Manufacturers |
8 / 12 page RT9164 www.richtek-ic.com.tw DS9164-08 May 2001 8 Application Information Output voltage adjustment Like most regulators, the RT9164 regulates the output by comparing the output voltage to an internally generated reference voltage. On the adjustable version as shown in Fig.4, the VREF is available externally as 1.25V between VOUT and ADJ. The voltage ratio formed by R1 and R2 should be set to conduct 10mA (minumum output load). The output voltage is given by the following equation: VOUT = VREF (1+ 2 1 R R ) + IADJ × R2 On fixed versions of RT9164, the voltage divider is provided internally. Fig. 4 Basic Adjustable Regulator Input Bypass Capacitor An input capacitor is recommended. A 10 µF tantalum on the input is a suitable input bypassing for almost all applications. Adjust Terminal Bypass Capacitor The adjust terminal can be bypassed to ground with a bypass capacitor (CADJ) to improve ripple rejection. This bypass capacitor prevents ripple from being amplified as the output voltage is increased. At any ripple frequency, the impedance of the CADJ should be less than R1 to prevent the ripple from being amplified: (2 π * fRIPPLE * CADJ) < R1 The R1 is the resistor between the output and the adjust pin. Its value is normally in the range of 100- 200 Ω. For example, with R1 = 124Ω and fRIPPLE = 120Hz, the CADJ should be > 11µF. Output Capacitor RT9164 requires a capacitor from VOUT to GND to provide compensation feedback to the internal gain stage. This is to ensure stability at the output terminal. Typically, a 10 µF tantalum or 50µF aluminum electrolytic is sufficient. Note: It is important that the ESR for this capacitor does not exceed 0.5 Ω. The output capacitor does not have a theoretical upper limit and increasing its value will increase stability. COUT = 100 µF or more is typical for high current regulator design. Load Regulation When the adjustable regulator is used (Fig.5), the best load regulation is accomplished when the top of the resistor divider (R1) is connected directly to the output pin of the RT9164. When so connected, RP is not multiplied by the divider ratio. For Fixed output version, the top of R1 is internally connected to the output and ground pins can be connected to low side of the load. Fig. 5 Best Load Regulation Using Adjustable Output Regulator Thermal Protection RT9164 has thermal protection which limits junction temperature to 150 °C. However, device functionality RT9164 VOUT VIN VIN GND RL Connect R2 to load RP Parasitic Line Resistance R2 R1 (Connect R1 to case R2) RT9164 ADJ VOUT VREF R1 R2 VOUT IADJ 65 µA VIN VIN 10 µF + CADJ + 10 µF + |
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