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OPA547 Datasheet(PDF) 8 Page - Burr-Brown (TI) |
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OPA547 Datasheet(HTML) 8 Page - Burr-Brown (TI) |
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8 / 18 page  OPA547 8 SBOS056F www.ti.com APPLICATIONS INFORMATION Figure 1 shows the OPA547 connected as a basic noninverting amplifier. The OPA547 can be used in virtually any op amp configuration. Power-supply terminals should be bypassed with low series impedance capacitors. The technique shown, using a ce- ramic and tantalum type in parallel, is recommended. Power- supply wiring should have low series impedance. G = 1+ R 2 R 1 Z L E/S 3 7 5 4 2 1 6 R 2 I LIM (1) R 1 0.1 µF(2) 10 µF OPA547 V– V+ + + V IN 10 µF 0.1 µF(2) V O NOTES: (1) I LIM connected to V– gives the maximum current limit, 750mA (peak). (2) Connect 0.1 µF capacitors directly to package power-supply pins. With the OPA547, the simplest method for adjusting the current limit uses a resistor or potentiometer connected between the ILIM pin and V– according to the Equation 1: R I k CL LIM = ()( . ) – . 5000 4 75 31 6 Ω The low-level control signal (0 µA to 150µA) also allows the current limit to be digitally controlled with a current-out or voltage-out DAC reference to V– according to the equations given in Figure 3. Figure 3 shows a simplified schematic of the internal circuitry used to set the current limit. Leaving the ILIM pin open programs the output current to zero, while connecting ILIM directly to V– programs the maximum output current limit, typically 750mA. SAFE OPERATING AREA Stress on the output transistors is determined both by the output current and by the output voltage across the conduct- ing output transistor, VS – VO. The power dissipated by the output transistor is equal to the product of the output current and the voltage across the conducting transistor, VS – VO. The Safe Operating Area (SOA curve, Figure 2) shows the permissible range of voltage and current. FIGURE 1. Basic Circuit Connections. POWER SUPPLIES The OPA547 operates from single (+8V to +60V) or dual ( ±4V to ±30V) supplies with excellent performance. Most behavior remains unchanged throughout the full operating voltage range. Parameters which vary significantly with oper- ating voltage are shown in the typical characteristic curves. Some applications do not require equal positive and negative output voltage swing. Power-supply voltages do not need to be equal. The OPA547 can operate with as little as 8V between the supplies and with up to 60V between the supplies. For example, the positive supply could be set to 55V with the negative supply at –5V, or vice-versa. ADJUSTABLE CURRENT LIMIT The OPA547 features an accurate, user-selected current limit. Current limit is set from 0mA to 750mA by controlling the input to the ILIM pin. Unlike other designs which use a power resistor in series with the output current path, the OPA547 senses the load indirectly. This allows the current limit to be set with a 0 µA to 150µA control signal. In contrast, other designs require a limiting resistor to handle the full output current (750mA in this case). 12 5 10 V S – VO (V) 20 50 100 SAFE OPERATING AREA 1k 100 10 Current-Limited T C = 25°C T C = 125°C T C = 85°C Output current may be limited to less than 500mA—see text. Pulse Operation Only (<50% Duty-Cycle) FIGURE 2. Safe Operating Area. The safe output current decreases as VS – VO increases. Output short-circuits are a very demanding case for SOA. A short-circuit to ground forces the full power-supply voltage (V+ or V–) across the conducting transistor. With TC = 25°C the maximum output current of 500mA can be achieved under most conditions. Increasing the case temperature reduces the safe output current that can be tolerated without activating the thermal shutdown circuit of the OPA547. For further insight on SOA, consult Application Bulletin SBOA022. POWER DISSIPATION Power dissipation depends on power supply, signal, and load conditions. For dc signals, power dissipation is equal to the product of output current times the voltage across the con- (1) |
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