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TMP814 Datasheet(PDF) 9 Page - Texas Instruments |
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TMP814 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 21 page TMP814 www.ti.com SLDS151A – MAY 2009 – REVISED JUNE 2015 Feature Description (continued) 7.3.2 Constant Voltage Bias Constant Voltage Bias is provided through VOVER Pin. This must be used for applications of 24 V and 48 V. See Figure 3. This drive limits the VCC under permissible values even when Vm > 18 V. Leave this pin open when not in use. 7.3.3 Soft-Start Soft-Start Time can be using the ROFF pin. Connect 6 to 6VREG is not used. 7.3.4 Lock Detection When the rotor is locked by external means or load conditions, The lock detection feature helps to protect the circuit by not allowing the current to rise beyond control. A hiccup mechanism is also provided. The lock detection is enabled by a connection to the lock detection capacitor. When the pin voltage rises to 1.2 V, the constant current charge and discharge circuits cause the drive to and enables it back when voltage reaches 0. If lock detection feature is not desired in the application, then this pin must be connected to ground. 7.3.5 Current Limit Current limit resistor is connected in a return path of H Bridge connection. This input is connected to the SENSE pin where the Current is limited when the voltage across this resistor crosses the voltage at VLIM Pin. If not used, this pin needs to be connected to ground. 7.3.6 Minimum Speed Setting Minimum speed setting feature is used with the RMI pin in the device. Connect to 6VREG with a pullup resistor if not used. 7.3.7 Speed Output The speed of the motor while running can be observed at the FG pin which is an open collector output and needs to be pulled high for using it. 7.3.8 Drive Frequency Selection The P channel switches in the device are switched with higher frequency whose duty cycle is decided by the speed control input. The frequency of the operation can be decided by the capacitor connected at the CPWM pin. As this is used also for the current limiting canceling signal, be sure to connect the capacitor even when speed control is not used. Copyright © 2009–2015, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: TMP814 |
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