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DRV101FKTWTG3 Datasheet(PDF) 9 Page - Texas Instruments |
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DRV101FKTWTG3 Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 27 page  DRV101 9 SBVS008B www.ti.com APPLICATIONS INFORMATION POWER SUPPLY The DRV101 operates from a single +9V to +60V supply with excellent performance. Most behavior remains un- changed throughout the full operating voltage range. Param- eters which vary significantly with operating voltage are shown in the Typical Performance Curves. ADJUSTABLE INITIAL 100% DUTY CYCLE A unique feature of the DRV101 is its ability to provide an initial constant dc output (100% duty cycle) and then switch to PWM mode to save power. This function is particularly useful when driving solenoids which have a much higher pull-in current requirement than hold requirement. The duration of this constant dc output (before PWM output begins) can be externally controlled with a capacitor con- nected from Delay Adjust (pin 2) to ground according to the following equation: Delay Time ≈ C D • 10 6 (time in seconds, CD in Farads) Leaving the Delay Adjust pin open results in a constant output time of approximately 15 µs. The duration of this initial output can be reduced to less than 3 µs by connecting the pin to 5V. Table I provides examples of desired “delay” times (constant output before PWM mode) and the appropri- ate capacitor values or pin connection. CONSTANT OUTPUT DURATION CD 3 µs Pin connected to 5V 15 µs Pin open 100 µs 100pF 1ms 1nF 100ms 0.1 µF TABLE I. Delay Adjust Pin Connections. ADJUSTABLE DUTY CYCLE The DRV101’s externally adjustable duty cycle provides an accurate means of controlling power delivered to the load. Duty cycle can be set from 10% to 100% with an external resistor, analog voltage, or the output of a D/A converter. Reduced duty cycle results in reduced power dissipation. This keeps the DRV101 and load cooler, resulting in in- creased reliability for both devices. PWM frequency is a constant 24kHz. Resistor Controlled Duty Cycle Duty cycle is easily programmed with a resistor (RPWM) connected between the Duty Cycle Adjust pin and ground. Increased resistor values correspond to decreased duty cycles. Table II provides resistor values for typical duty cycles. Resistor values for additional duty cycles can be obtained from Figure 3. For reference purposes, the equation for calculating RPWM is included in Figure 3. FIGURE 3. RPWM vs Duty Cycle. FIGURE 2. Simplified Circuit Model of the Delay Adjust Pin. The internal Delay Adjust circuitry is composed of a 3 µA current source and a 3V comparator as shown in Figure 2. Thus, when the pin voltage is less than 3V, the output device is 100% on (dc output mode). 3µA 2 C D V S 3V Reference Comparator Delay Adjust DRV101 RESISTOR(1) VOLTAGE(2) DUTY CYCLE RPWM (kΩ)VPWM (V) 10 976 3.7 20 205 3.4 30 84.5 3.0 40 46.4 2.6 50 28.7 2.2 60 18.2 1.75 70 11.8 1.35 80 7.50 1.00 90 4.87 0.75 NOTES: (1) Resistor values listed are nearest 1% standard values. (2) Do not drive pin below 0.1V. For additional values, see “Duty Cycle vs Voltage” typical performance curve. TABLE II. Duty Cycle Adjust. TA= +25°C, VS = +24V. 10 20 40 60 100 80 Duty Cycle (%) 1000 100 10 1 R PWM = [ a + b (DC) + c (DC) 2 + d (DC)3 + e (DC)4]–1 where: a = 2.4711 x 10–6 b = –5.2095 x 10–7 c = 4.4576 x 10–8 d = –7.6427 x 10–10 e = 6.8039 x 10–12 R PWM = [2.4711 x 10 –6 + (–5.2095 x 10–7) (50) + (4.4576 x 10–8) (50)2 + (–7.6427 x 10–10) (50)3 + (6.8039 x 10–12) (50)4]–1 DC = duty cycle in % For 50% duty cycle: = 28.7k Ω |
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