Datenblatt-Suchmaschine für elektronische Bauteile |
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LS7561N Datenblatt(PDF) 2 Page - LSI Computer Systems |
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LS7561N Datenblatt(HTML) 2 Page - LSI Computer Systems |
2 / 8 page ERROR AMPLIFIER Inputs (Pins 6, 7) Output (Pin 8) For closed loop control, the Tachometer Output is applied through a resistor to the negative input of the Error Amplifier on Pin 7. A speed control potentiometer is connected to the positive input of the Error Amplifier on Pin 6. A parallel RC Network is connected between the Output of the Error Amplifier on Pin 8 and Pin 7. The Amplifier, configured this way, enables the variable pulse width to be converted to a DC voltage which is used to control the motor speed. The potentiometer is used to set the desired motor speed. For open loop control, configure the Error Amplifier as a voltage follower by connecting Pin 7 directly to Pin 8 and do not connect the Tachometer Output signal to the Error Amplifier. TOP DRIVER POLARITY SELECT Input (Pin 20) A High on this input selects a High Polarity to enable the Top Out- put Motor Drivers and a Low selects a Low Polarity to enable the Top Output Motor Drivers. OUTPUT DRIVERS (Pins 12, 13, 14, 15, 16, 17) Each Driver Output provides a CMOS compatible signal for driv- ing Buffers/Power Transistors. The Outputs are capable of sink- ing/sourcing 25mA with a 1.5V drop across the IC, at VDD = 12V. FAULT INDICATOR Output (Pin 3) Open drain output to provide sinking current for driving an ex- ternal device, such as a LED, through an emitter follower (see Figure 3) to indicate a malfunction condition. The output occurs under any of the following conditions: 1) Overcurrent Sense condition 2) Enable Input below VR / 2.2 3) Invalid Sensor code 4) Chip power supply less than 9V 5) VR Output less than 4.1V VR Output (Pin 19) 6V Reference Voltage Output that can supply 20mA of current at VDD = 12V for powering input Sensors. VDD (Pin 28) Supply Voltage positive terminal. OSCILLATOR (Pin 9) An external RC network is connected to this input to set the fre- quency of the Sawtooth Schmitt Trigger Oscillator. The Sawtooth is applied to the PWM Comparator along with the output of the Er- ror Amplifier. The output of the PWM Comparator is a Pulse Width Modulated Signal which is used to vary the effective drive to the motor and, hence, the motor speed. OVERCURRENT SENSE (Pins 10, 11) The input to Pin 10 comes from the high side of a fractional ohm current sensing resistor. The voltage at this input is compared to an internal 100mV Reference. When the voltage exceeds the 100mV Reference, an Overcurrent Condition exists and the Out- put Drivers are switched Off until the end of the sawtooth os- cillator ramp-up. When the sawtooth switches low, the Over- current Condition is sampled, and if it no longer exists, the Output Drivers are switched On again. Otherwise, the Output Drivers re- main Off until the end of the next sawtooth. The input to Pin 11 comes from the low side (Gnd) of the current sensing resistor and connects to the low side of the internal 100mV Reference. PWM CONTROL Input (Pin 21) A High on this input causes only the Bottom Drivers to be Pulse Width Modulated. A Low on this input causes both Top and Bot- tom Drivers to have PWM. TACHOMETER Output (Pin 5) The output of the Frequency To Pulse Width Converter is tied to this pin. The Converter uses the three Sensor Inputs and external RC Network to generate a variable frequency output with a fixed positive pulse width. RC Input (Pin 4) The external RC network connected to this input programs the positive pulse width of the Frequency to Pulse Width Converter. VSS (Pin 18) Supply Voltage negative terminal. 7560N-030906-2 MAXIMUM RATINGS (Voltages referenced to Vss) SYMBOL VALUE UNIT Power Supply Voltage VDD 20 V Voltage at any input VIN VsS - 0.5 to VR V Operating Temperature TA -25 to +85 °C Storage Temperature TSTG -65 to +150 °C Output Drive Sink/Source Current Io 75 mA VR Output Source Current IR 30 mA ELECTRICAL CHARACTERISTICS VDD = 12V, RT = 47k Ω, CT = 0.001µF, RS = 10kΩ, CS= 0.01µF, RF = 5.6kΩ (See Figure 3) TA = 25°C, unless otherwise specified PARAMETER SYMBOL MIN TYP MAX UNIT Reference Voltage VR 5.7 6.0 6.35 V Line Regulation ∆VR - 100 200 mV VDD = 10V to 18V, IREF = 1.0mA Temperature Stability TA = 0°C to 70°C ∆VR - +/- 1.0 - % TA = 0°C to 85°C ∆VR - +/- 1.3 - % Error Amplifier: Input Offset Voltage VIO - 5 15 mV Input Current IIN - 0 10 nA Input Common Mode Voltage Range VICR (0 to VR) V Open Loop Voltage Gain (RL = 15k Ω) AVOL 70 80 - dB Common Mode Rejection Ratio CMRR 60 - - dB Power Supply Rejection Ratio PSRR 60 - - dB |
Ähnliche Teilenummer - LS7561N |
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Ähnliche Beschreibung - LS7561N |
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