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CS8321YDP3 датащи(PDF) 2 Page - Cherry Semiconductor Corporation |
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CS8321YDP3 датащи(HTML) 2 Page - Cherry Semiconductor Corporation |
2 / 6 page 2 Electrical Characteristics: 6V < VIN < 26V, IOUT=1mA, -40¡C ² TA ² 125¡C, -40¡C ² TJ ² 150¡C unless otherwise specified. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT PACKAGE LEAD # LEAD SYMBOL FUNCTION Circuit Description and Application Notes The CS8321 is a series pass voltage regulator. It consists of an error amplifier, bandgap voltage reference, PNP pass transistor with antisaturation control, and current limit. As the voltage at the input, VIN, is increased, QN is for- ward biased via R. QN provides base drive for QP. As QP becomes forward biased, the output voltage, VOUT, begins to rise as QPÕs output current charges the output capacitor. Once VOUT rises to a certain level, the error amplifier becomes biased and provides the appropriate amount of base current to QP. The error amplifier monitors the scaled output voltage via an internal voltage divider, R1 and R2, and compares it to the bandgap voltage reference. The error amplifierÕs output is a current which is equal to the error amplifierÕs differential input voltage times its transconductance. Therefore, the error amplifier varies the base drive current to QN, which provides bias to QP, based on the difference between the reference voltage and the scaled output voltage, VOUT. Antisaturation Protection An antisaturation control circuit has also been added to prevent the pass transistor from going into deep satura- tion, which would cause excessive power dissipation due to large bias currents lost to the substrate via a parasitic PNP transistor, as shown in Figure 1. Figure 1. The parasitic PNP transistor which is part of the pass transis- tor (QP) structure. VOUT QP VIN QParasitic Substrate Voltage Reference and Output Circuitry Package Lead Description s Output Stage Output Voltage, VOUT 9V < VIN < 16V, 4.90 5.00 5.10 V 100µA ² IOUT ² 150mA Dropout Voltage (VIN-VOUT)IOUT = 150mA, -40¡C ² TA ² 85¡C 0.3 0.5 V IOUT = 150mA, TA = 125¡C 0.6 V Quiescent Current, (IQ)IOUT = 1mA @ VIN = 13V 200 µA IOUT < 50mA @ VIN = 13V 4 6 mA IOUT < 150mA @ VIN = 13V 15 25 mA Load Regulation VIN = 14V, 100µA < IOUT < 150mA 5 50 mV Line Regulation 6V < V < 26V, IOUT = 1mA 5 50 mV Ripple Rejection 7 Ð VIN Ð 17V, IOUT = 150mA, 60 75 dB f = 120Hz Current Limit 175 250 mA Short Circuit Output Current VOUT = 0V 60 200 mA Reverse Current VOUT = 5V, VIN = 0V 140 200 µA 3L D2PAK 3L TO-220 11 VIN Input Voltage 2 2 Gnd Ground. All Gnd leads must be connected to Ground. 33 VOUT 5V, ±2%, 150mA Output. |
Аналогичный номер детали - CS8321YDP3 |
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Аналогичное описание - CS8321YDP3 |
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