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DRV103U Datasheet(PDF) 8 Page - Texas Instruments |
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DRV103U Datasheet(HTML) 8 Page - Texas Instruments |
8 / 24 page DRV103 8 SBVS029A The internal Delay Adjust circuitry is composed of a 3 µA current source and a 2.6V comparator, as shown in Figure 3. Thus, when the pin voltage is less than 2.6V, the output device is 100% ON (DC output mode). OSCILLATOR FREQUENCY ADJUST The DRV103 PWM output frequency can be easily pro- grammed over a wide range by connecting a resistor (RFREQ) between the Osc Freq Adj pin (pin 3) and ground. A range of 500Hz to 100kHz can be achieved with practical resistor values, as shown in Table II. Refer to “PWM Frequency vs RFREQ” typical performance curve shown in Figure 4 for additional information. Although oscillator frequency opera- tion below 500Hz is possible, resistors higher than 10M will be required. The pin becomes a very high impedance node and is, therefore, sensitive to noise pickup and PCB leakage currents if very high resistor values are used. Refer to Figure 3 for a simplified circuit of the frequency adjust input. APPLICATIONS INFORMATION POWER SUPPLY The DRV103 operates from a single +8V to +32V supply with excellent performance. Most behavior remains un- changed throughout the full operating voltage range. Param- eters that vary significantly with operating voltage are shown in the Typical Performance Curves. The DRV103 supply voltage should be ≥ the supply voltage on the load. ADJUSTABLE DELAY TIME (INITIAL 100% DUTY CYCLE) A unique feature of the DRV103 is its ability to provide an initial constant DC output (100% duty cycle) and then switch to PWM mode output to save power. This function is particularly useful when driving solenoids that have a much higher pull-in current requirement than continuous hold requirement. The duration of this constant DC output (before PWM output begins) can be externally controlled by a capacitor connected from Delay Adjust (pin 2) to ground according to the following equation: Delay Time ≈ C D • 10 6 (time in seconds, CD in Farads • 1.1) Leaving the Delay Adjust pin open results in a constant output time of approximately 18 µs. The duration of this initial output can be reduced to less than 1 µs by connecting the pin to 5V. Table I provides examples of delay times (constant output before PWM mode) achieved with selected capacitor values. INITIAL CONSTANT OUTPUT DURATION CD 1 µs Pin 2 Tied to +5V 18 µs Pin 2 Open 110 µs 100pF 1.1ms 1nF 11ms 10nF 110ms 100nF 1.1s 1 µF 11s 10 µF TABLE I. Delay Adjust Times. FIGURE 3. Simplified Delay Adjust and Frequency Adjust Inputs. 3 µA C D R FREQ V FREQ I REF +V S V REF Reset +2.6V +1.3V Input 1000M 100M 10M 1M 100k 10k 1k 100 1k 10 10k 100k 1M PWM FREQUENCY vs R FREQ Frequency (Hz) FIGURE 4. Using a Resistor to Program Oscillator Frequency. RFREQ (kΩ) = 6808417/F(1.0288) OSCILLATOR FREQUENCY RFREQ (nearest 1% values) (Hz) ( Ω) 100k 47.5k 50k 100k 25k 205k 10k 523k 5k 1.07M 500 11.3M TABLE II. Oscillator Frequency Resistance. |
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