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DRV102F Datasheet(PDF) 11 Page - Texas Instruments |
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DRV102F Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 23 page  DRV102 11 SBVS009A www.ti.com STATUS FLAG Flag (pin 7) provides fault indication for under-current, over-current, and thermal shutdown conditions. During a fault condition, Flag output is driven low (pin voltage typically drops to 0.2V). A pull-up resistor, as shown in Figure 7, is required to interface with standard logic. A small value capacitor may be needed between Flag and ground in noisy applications. Figure 7 gives an example of a non-latching fault monitoring circuit, while Figure 8 provides a latching version. The Flag pin can sink several milliamps, sufficient to drive external logic circuitry or an LED (Figure 9) to indicate when a fault has occurred. In addition, the Flag pin can be used to turn off other DRV102’s in a system for chain fault protection. Over/Under Current Fault An over-current fault occurs when the output current ex- ceeds the current limit. All units are guaranteed to drive 2A without current limiting. Typically, units will limit at 2.7A. The status flag is not latched. Since current during PWM mode is switched on and off, the flag output will be modu- lated with PWM timing (see flag waveforms in the Typical Performance Curves). An under-current fault occurs when the output current is below the under-scale current threshold (typically 16mA). For example, this function indicates when the load is discon- nected. Again, the flag output is not latched, so an under- current condition during PWM mode will produce a flag output that is modulated by the PWM waveform. An initial, brief under-current flag normally appears driving inductive loads and may be avoided by adding a parallel resistor sufficient to move the initial current above the under-current threshold. Avoid adding capacitance to pin 6 (Out) as it may cause momentary current limiting. Over-Temperature Fault A thermal fault occurs when the die reaches approximately 165 °C, producing a similar effect as pulling the input low. Internal shutdown circuitry disables the output and resets the Delay Adjust pin. The Flag is latched in the low state (fault condition) until the die has cooled to approximately 150 °C. A thermal fault can occur in any mode of operation. Recov- ery from thermal fault will start in delay mode (constant dc output). FIGURE 8. Latching Fault Monitoring Circuit. FIGURE 7. Non-Latching Fault Monitoring Circuit. DRV102 Thermal Shutdown Over/Under Current 6 5 7 V S Out 4 Gnd 5k Ω Pull-Up +5V Flag TTL or HCT DRV102 Thermal Shutdown Over/Under Current 5 7 6 20k Ω +5V Flag Q Q CLR Flag Flag Flag Reset J CLK GND K V S 74XX76A (1) NOTE: (1) Small capacitor (10pF) may be required in noisy environments. 4 Gnd V S Out FIGURE 9. LED to Indicate Fault Condition. DRV102 Thermal Shutdown Over/Under Current 7 5k Ω +5V Flag (LED) HLMP-Q156 5 6 4 Gnd V S Out |
Similar Part No. - DRV102F |
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Similar Description - DRV102F |
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