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UC3172A датащи(PDF) 6 Page - Texas Instruments |
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UC3172A датащи(HTML) 6 Page - Texas Instruments |
6 / 12 page VPARK: The auxiliary inverting input to the A amplifier, activated during park conditions on the UC3172A. An in- ternal auxiliary non-inverting input is connected to the 1.3V reference. When the auxiliary inputs are activated, the A amplifier will force a programmed voltage at its out- put for a maximum back-EMF/velocity retract of the head. The park condition on the UC3172A is always acti- vated by any one of the following four conditions, 1: a low condition on either of the UV inputs, 2: a high input level at the PARK input, 3: a UVLO condition at the VL supply pin, and 4: activation of the TSD (thermal shutdown) pro- tection circuit. During a UVLO condition at the VL pin the auxiliary inputs to the A amplifier are over-ridden, and the A amplifier output is forced to its high state. UV1 & 2: Inputs to the UV comparator, these inputs are high impedance sensing points used to monitor external supply conditions. Either of the inputs going low will force the device into a park condition, and force the PWROK output to an active low state. If either of these inputs is not used it should be connected to a voltage greater than 1.3V. APPLICATION INFORMATION PIN DESCRIPTIONS (cont.) UC3172A 0 0.1 0.2 0.3 0 500 100 600 200 700 300 800 400 900 1000 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 0°C 0°C 25°C 25°C 125°C 125°C LOW-SIDE HIGH-SIDE Output Current (mA) A and B Amplifier High and Low Vsats 0.6 0 500 100 600 200 700 300 800 400 900 1000 0.8 1.0 1.2 1.4 1.6 1.8 0°C 25°C 125°C Output Current (mA) A and B Amplifier Total Vsat 0 0.2 0 50 100 150 200 0.4 0.6 0.8 1 0°C 25°C 125°C A or B Amplifier High-Side Vsat Increase (mVolts) I= 450mA OUT VIN to VC Headroom 0 0.1 0 5 10 15 20 0.2 0.3 0.4 0.5 0°C 25°C 125°C Power OK Output Current (mA) PWROK Saturation Voltage 6 |
Аналогичный номер детали - UC3172A |
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Аналогичное описание - UC3172A |
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