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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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CS8127 데이터시트(PDF) 1 Page - Cherry Semiconductor Corporation |
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CS8127 데이터시트(HTML) 1 Page - Cherry Semiconductor Corporation |
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1 / 6 page  1 The CS8127 contains all the necessary control circuitry to implement a 5V lin- ear regulator. An external pass device is used to produce superior performance compared to conventional monolithic regulators. The CS8127 with a TIP42 PNP transistor typically provides a 100mV dropout voltage at 500mA, increasing to 350mV at 3A. Quiescent current at 500mA is only 5mA. Monolithic regulators cannot approach these figures because their power tran- sistors do not provide the high beta and excellent saturation characteristics at high currents. The CS8127 is compatible with a wide variety of external transis- tors, allowing flexibility for thermal, space, and cost management. The CS8127 includes thermal shutdown, externally programmable current limit, and over-voltage shutdown, making it suitable for use in automotive and switching regulator post regulator appli- cations. An optional external RC filter added to the CS8127 supply lead pro- vides EMC hardening in addition to the on-chip EMC hardening. The SENSE lead allows remote sensing of the output voltage for improved regulation. An active microprocessor RESET func- tion is included on-chip with externally programmable delay time. During power-up, or after detection of any error in the regulated output, the RESET lead will remain in the low state for the dura- tion of the delay. Types of errors include short circuit, low input voltage, over- voltage shutdown, thermal shutdown, or others that cause the output to become unregulated. This function is independent of the input voltage and will function correctly with an output voltage as low as 1V. Hysteresis is included in both the reset and delay comparators for noise immunity and to prevent oscillations. A latching dis- charge circuit is used to discharge the delay capacitor, even when triggered by a relatively short fault condition. This circuit improves upon the commonly used SCR structure by providing improved noise immunity and full capacitor discharge (0.2V typ). Features + - - + IC Reference Gnd PRE- REGULATOR IC Power Gnd Regulated Supply for Circuit Bias 10 mA Delay Current Delay Ref Gnd Pwr Gnd Thermal Shutdown Bandgap Reference Reset Comparator Latching Discharge Q S R Vdis Delay Comparator 1.25V Error Amp PULLUP VIN Sense - - + RESET Over Voltage Shutdown 50 mA VOUT s Externally Set Delay for Reset s 60V Peak Transient Capability s Internal Thermal Overload Protection s 3% Output Accuracy s Active RESET s Noise Immunity s On Chip EMC Hardening Protection Incorporated s Externally Set Current Limit Package Options 8L SO & 8L PDIP 5V Linear Controller/Driver 1 VIN 2 3 4 Sense Delay VOUT Pwr Gnd Pullup Ref Gnd 8 7 6 5 RESET CS8127 Description Block Diagram A Company ¨ Rev. 2/12/99 Cherry Semiconductor Corporation 2000 South County Trail, East Greenwich, RI 02818 Tel: (401)885-3600 Fax: (401)885-5786 Email: info@cherry-semi.com Web Site: www.cherry-semi.com |
유사한 부품 번호 - CS8127 |
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유사한 설명 - CS8127 |
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