TWR-MC-LV3PH Freescale Semiconductor, TWR-MC-LV3PH Datasheet - Page 8

• Manufacturer Part Number: TWR-MC-LV3PH
• Description: Power Management IC Development Tools Low-volt 3-phase MC
• Manufacturer: Freescale Semiconductor
• Type: Motor / Motion Controllers & Driversr

Specifications of TWR-MC-LV3PH

• Rohs: yes
• Product: Tower Systems
• Tool Is For Evaluation Of: MC33937A
• Input Voltage: 12 V to 24 V
• Output Voltage: 3.3 V, 5 V
• Description/function: Part of the Tower Systems
• Dimensions: 3.54 in x 3.18 in
• Interface Type: SPI
• Output Current: 8 A

Signal Description
3.11 Encoder/Hall-Effect Interface
The TWR-MC-LV3PH contains an Encoder/Hall-Effect interface. The circuit is designed to accept +3.3 V to +5.0 V encoder
or Hall-Effect sensor inputs. Input noise filtering is supplied on the input path for the Encoder/Hall-Effect interface. Filtered
signals are then connected to the elevator main port.
3.12 Brake
An external brake resistor can be connected to dissipate regenerative motor energy during periods of active deceleration or
rapid reversal. Under these conditions, motor back EMF adds to the DC bus voltage. Without a means to dissipate excess
energy, an overvoltage condition could easily occur. An external dissipative resistor connected to J4 can serve to dissipate
energy across the DC bus. MOSEFET Q8 is turned on by software when the bus voltage sensing circuit exceeds the level set
in that software. Power dissipation capability depends on the capability of the externally connected dissipative resistor.
The MIC4127YME is a 5.0 V-tolerant, dual MOSFET pre-driver. This board uses its A channel to drive the braking-
resistance MOSFET.
4 Signal Description
This section provides more details about signals of input/output connectors and jumpers of the TWR- TWR-MC-LV3PH.
4.1 Power Supply Input Connector J1
The power supply input connector, labeled J1, accepts DC voltages from 12 V to 50 V/8 A maximum. The J1 connector is a
2.1 mm power jack for plug-in type DC power supply connections. The board has reverse polarity protection.
Power applied to the board is indicated by a green +5 V LED.
4.2 External Brake Resistor Interface J4
A brake resistor can be connected to brake-resistor connector J4, allowing for power dissipation. This can be controlled
through the Brake control signal.
4.3 Motor Connector J5
Power outputs to the motor are located on connector J1. Phase outputs are labeled A, B, and C.
assignments. On a permanent magnet synchronous motor, any one of the three phase windings can be connected here. For
brushless DC motors, you must connect the wire color-coded for phase A into the connector terminal labeled A, and so on for
phase B and phase C.
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TWR-MC-LV3PH User’s Guide, Rev. 1, 07/2012
Table 3
Freescale Semiconductor, Inc.
contains pin