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DRV103UG4 Datasheet(PDF) 10 Page - Burr-Brown (TI) |
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DRV103UG4 Datasheet(HTML) 10 Page - Burr-Brown (TI) |
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10 / 24 page  DRV103 10 SBVS029A The Duty Cycle Adjust pin is internally driven by an oscillator frequency dependent current source and connects to the input of a comparator as shown in Figure 8. The DRV103’s PWM adjustment is inherently monotonic. That is, a decreased voltage (or resistor value) always produces an increased duty cycle. DRV103 Thermal Shutdown Over Current PWM 4 5 7 OUT 5k Ω Pull-Up +5V OK TTL or HCT FIGURE 9. Non-Latching Fault Monitoring Circuit. FIGURE 10. Latching Fault Monitoring Circuit. 7 5k Ω +5V OK (LED) HLMP-Q156 7 DRV103 Thermal Shutdown Over Current 4 5 OUT PWM FIGURE 11. LED to Indicate Fault Condition. 7 20k Ω +5V Q Q CLR OK OK OK Reset J CLK GND K V S 74XX76A (1) NOTE: (1) Small capacitor (10pF) may be required in noisy environments. DRV103 Thermal Shutdown Over Current 4 5 OUT PWM OK 2.75 • I REF R PWM +V S OSC 3.9V 1.3V FIGURE 8. Simplified Duty Cycle Adjust Input. STATUS FLAG The OK Flag (pin 7) provides a fault indication for over- current and thermal shutdown conditions. During a fault condition, the Status OK Flag output is driven LOW (pin voltage typically drops to 0.3V). A pull-up resistor, as shown in Figure 9, is required to interface with standard logic. Figure 9 also gives an example of a non-latching fault monitoring circuit, while Figure 10 provides a latching version. The OK Flag pin can sink up to 10mA, sufficient to drive external logic circuitry, a reed relay, or an LED, as shown in Figure 11, to indicate when a fault has occurred. In addition, the OK Flag pin can be used to turn off other DRV103s in a system for chain fault protection. Over Current Fault An over-current fault occurs when the PWM peak output current is greater than approximately 3.75A. The OK flag is not latched. Since current during PWM mode is switched on and off, the OK flag output will be modulated with PWM timing (see OK flag waveforms in the Typical Performance Curves). 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 160 °C, producing a similar effect as pulling the input low. Internal shutdown circuitry disables the output. The OK Flag is latched in the LOW state (fault condition) until the die has cooled to approximately 140 °C. |
Similar Part No. - DRV103UG4 |
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Similar Description - DRV103UG4 |
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