поискавой системы для электроныых деталей |
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UC3173AQP датащи(PDF) 6 Page - Texas Instruments |
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UC3173AQP датащи(HTML) 6 Page - Texas Instruments |
6 / 12 page 6 UC3173A VL: Logic portions of the UC3173A are powered by this supply pin, including the reference, UVLO, the UV com- parators, and the PRKDRV and PWROK outputs. This pin is a low current supply that would normally be tied to the VC pin, or to a parking hold up capacitor for ex- tended parking operation with very low recovered back emf. VPARK: The auxiliary inverting input to the A amplifier, activated during park conditions on the UC3173A. 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 UC3173A is always activated by any one of the following four conditions, 1: a low con- dition 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) protec- tion 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. PIN DESCRIPTIONS (cont.) 0 0.2 0 100 200 300 400 500 0.4 0.6 0.8 1 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 V SATS 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 0 100 200 300 400 500 0°C 25°C 125°C Output Current (mA) A and B Amplifier Total V SAT 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 V Increase (mVolts) SAT I= 450mA OUT VINto VCHeadroom 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 APPLICATION INFORMATION |
Аналогичный номер детали - UC3173AQP |
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Аналогичное описание - UC3173AQP |
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