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CS8128YD8 데이터시트(PDF) 1 Page - ON Semiconductor |
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CS8128YD8 데이터시트(HTML) 1 Page - ON Semiconductor |
1 / 8 page 1 Features s Externally Set Delay for Reset s 60V Load Dump Protection 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 s Externally Set Overvoltage Shutdown Package Options 8 Lead SO Narrow 5V Linear Controller/Driver 1 VIN 2 3 4 Sense Delay VOUT Pwr Gnd SHUTDOWN Ref Gnd 8 7 6 5 RESET CS8128 Description Block Diagram December, 2001 - Rev. 7 ON Semiconductor 2000 South County Trail, East Greenwich, RI 02818 Tel: (401)885–3600 Fax: (401)885–5786 N. American Technical Support: 800-282-9855 Web Site: www.cherry–semi.com The CS8128 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 CS8128 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 CS8128 is compatible with a wide variety of external transis- tors, allowing flexibility for thermal, space, and cost management. The CS8128 includes thermal shutdown and externally programmable current limit and over-voltage shutdown, mak- ing it suitable for use in automotive and switching regulator post regulator appli- cations. An optional external RC filter added to the CS8128 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). + - - + IC Reference Gnd PRE- REGULATOR IC Power Gnd Regulated Supply for Circuit Bias 10 µA 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 SHUTDOWN VOUT VIN Sense - Over Voltage Shutdown - + RESET |
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