The current limit of the OPA593 has a ±10% tolerance for output currents between 25 mA and 50 mA, and

is ±5% accurate for currents ≥ 50 mA. Any resistor or DAC tolerances add to the OPA593 tolerance, so take

care when selecting the external components to make sure and provide the desired system level accuracy. A

correlation between the ideal or calculated output current limit and the actual current limit as measured on the

OPA593 is shown in Figure 7-2.

Current Limit Resistor (k )

0

25

50

75

100

125

150

175

200

225

250

-300

-250

-200

-150

-100

-50

0

50

100

150

200

250

300

Ideal ILIMIT Sourcing

Measured ILIMIT Sourcing

Ideal ILIMIT Sinking

Measured ILIMIT Sinking

Figure 7-2. Output Current vs Current-Limit Resistor Configuration

7.3.2 Overcurrent Flag

The OPA593 features an overcurrent flag to indicate a condition where the output current draw attempts to

exceed the limit configured through the ILIMIT pin, such as in a output short to ground fault condition. In such

a situation, the internal current limit of the amplifier limits the output current to the configured value and the flag

trips. This flag is an open-drain output designed to connect to standard low-voltage logic circuitry, such as a

microcontroller (MCU).

7.3.3 Overtemperature Flag

The OPA593 features an internal thermal shutdown feature. The op amp output stage disables when the junction

temperature reaches 170°C. After the junction temperature cools to 150°C, the output stage is enabled, and the

op amp resumes normal operation. In the event of an overtemperature condition a thermal flag trips. This flag is

an open-drain output designed to connect to standard low-voltage logic circuitry, such as an MCU.

OPA593

SBOS659A – JANUARY 2022 – REVISED MARCH 2022

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