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OPA552FA Datasheet(PDF) 9 Page - Texas Instruments |
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OPA552FA Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 24 page  OPA551, OPA552 9 SBOS100A www.ti.com APPLICATIONS INFORMATION Figure 1 shows the OPA551 connected as a basic non- inverting amplifier. The OPA551 can be used in virtually any op amp configuration. OPA552 is designed for use in configurations with gains of 5 or greater. Power supply terminals should be bypassed with 0.1 µF capacitors, or greater, near the power supply pins. Be sure that the capaci- tors are appropriately rated for the power supply voltage used. The OPA551 and OPA552 can supply output currents up to 200mA with excellent performance. FIGURE 1. Basic Circuit Connections. CURRENT LIMIT The OPA551 and OPA552 are designed with internal cur- rent-limiting circuitry that limits the output current to ap- proximately 380mA. The current limit varies with increasing junction temperature as shown in the typical curve “Current Limit vs Temperature.” This, in combination with the ther- mal protection circuitry, provides protection from many types of overload conditions including short circuit to ground. THERMAL PROTECTION The OPA551 and OPA552 have thermal shutdown circuitry that protects the amplifier from damage caused by overload conditions. The thermal protection circuitry disables the output when the junction temperature reaches approximately 160 °C, allowing the device to cool. When the junction temperature cools to approximately 140 °C, the output cir- cuitry is automatically re-enabled. The thermal shutdown function is not intended to replace proper heat sinking. Activation of the thermal shutdown circuitry is an indication of excessive power dissipation or an inadequate heat sink. Continuously running the amplifier into thermal shutdown can degrade reliability. The Thermal Shutdown Indicator (“flag”) pin can be moni- tored to determine if shutdown is occurring. During normal operation, the current output from the flag pin is typically 50nA. During shutdown, the current output from the flag pin increases to 120 µA (typical). This current output allows for easy interfacing to external logic. See Figure 2 for two examples implementing this function. FIGURE 2. Thermal Shutdown Indicator. G = 1+ R 2 R 1 Z L R 2 R 1 0.1 µF 10 µF OPA551 V– V+ + + V IN 10 µF 0.1 µF V O Flag (optional) Flag 80 µA to 160 µA HCT OPA551 Logic Ground V OUT +5V 27k Ω V LOGIC V OUT CMOS OPA551 Logic Ground Interfacing with CMOS Logic Interfacing with HCT Logic 47k Ω HP5082-2835 Interface to virtually any CMOS logic gate by choosing resistor value that provides a guaranteed logic high voltage with the minimum (80 µA) flag current. A diode clamp to the logic supply voltage assures that the CMOS is not damaged by overdrive. HCT logic has relatively well- controlled logic level. A properly chosen resistor value can guarantee proper logic high level throughout the full range of flag output current. |
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