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MC33166D2TR4G Datasheet(PDF) 8 Page - ON Semiconductor |
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MC33166D2TR4G Datasheet(HTML) 8 Page - ON Semiconductor |
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8 / 18 page  MC34166, MC33166 http://onsemi.com 8 equivalent Schottky barrier rectifier is recommended to fulfill these requirements. Undervoltage Lockout An Undervoltage Lockout comparator has been incorporated to guarantee that the integrated circuit is fully functional before the output stage is enabled. The internal 5.05 V reference is monitored by the comparator which enables the output stage when VCC exceeds 5.9 V. To prevent erratic output switching as the threshold is crossed, 0.9 V of hysteresis is provided. Thermal Protection Internal Thermal Shutdown circuitry is provided to protect the integrated circuit in the event that the maximum junction temperature is exceeded. When activated, typically at 170 °C, the latch is forced into a ‘reset’ state, disabling the output switch. This feature is provided to prevent catastrophic failures from accidental device overheating. It is not intended to be used as a substitute for proper heatsinking. The MC34166 is contained in a 5−lead TO−220 type package. The tab of the package is common with the center pin (Pin 3) and is normally connected to ground. DESIGN CONSIDERATIONS Do not attempt to construct a converter on wire−wrap or plug−in prototype boards. Special care should be taken to separate ground paths from signal currents and ground paths from load currents. All high current loops should be kept as short as possible using heavy copper runs to minimize ringing and radiated EMI. For best operation, a tight component layout is recommended. Capacitors CIN, CO, and all feedback components should be placed as close to the IC as physically possible. It is also imperative that the Schottky diode connected to the Switch Output be located as close to the IC as possible. Figure 16. Low Power Standby Circuit Figure 17. Over Voltage Shutdown Circuit Figure 18. Soft−Start Circuit 1 5 R1 120 Error Amp Compensation 100 mA I = Standby Mode VShutdown = VZener + 0.7 tSoft−Start ≈ 35,000 Css Css D1 D2 1.0 M Vin 1 5 R1 120 Error Amp Compensation 100 mA 1 5 R1 120 Error Amp Compensation 100 mA + + + |
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