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UCC2626DW Datasheet(PDF) 7 Page - Texas Instruments

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Part # UCC2626DW
Description  BRUSHLESS DC MOTOR CONTROLLER
Download  23 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

UCC2626DW Datasheet(HTML) 7 Page - Texas Instruments

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UCC2626, UCC3626
SLUS318B – APRIL 1999 – REVISED JANUARY 2002
7
www.ti.com
pin descriptions
SYNCH: The SYNCH input is used to synchronize the PWM oscillator with an external digital clock. When using
the SYNCH feature, a resistor equal to R_TACH must be placed in parallel with CT. When not using the SYNCH
feature, SYNCH must be grounded.
SNS_NI, SNS_I: These inputs are the noninverting and inverting inputs to the current sense amplifier,
respectively. The integrated amplifier is configured for a gain of five. An absolute value function is also
incorporated into the output in order to provide a representation of actual motor current when operating in
four-quadrant mode.
TACH_OUT: TACH_OUT is the output of a monostable triggered by a change in the commutation state, thus
providing a variable duty cycle, frequency output. The on time of the monostable is set by the timing capacitor
connected to C_TACH. The monostable is capable of being retriggered if a commutation occurs during its
on-time.
R_TACH: A resistor connected between R_TACH and ground programs the current for both the oscillator and
tachometer.
VDD: VDD is the input supply connection for this device. Undervoltage lockout keeps the outputs off for inputs
below 10.5 V. The input should be bypassed with a 0.1-
µF ceramic capacitor, minimum.
VREF: VREF is a 5-V, 2% trimmed reference output with 5 mA of maximum available output current. This pin
should be bypassed to ground with a ceramic capacitor with a value of at least 0.1
µF.
APPLICATION INFORMATION
Table 1 provides the decode logic for the six outputs, AHI, BHI, CHI, ALOW, BLOW, and CLOW as a function
of the BRAKE, COAST, DIR_IN, HALLA, HALLB, and HALLC inputs.
Table 1. Commutation Truth Table
BRAKE
COAST
DIR_IN
HALL
INPUTS
HIGH-SIDE
OUTPUTS
LOW-SIDE
OUTPUTS
BRAKE
COAST
DIR_IN
A
B
C
A
B
C
A
B
C
0
0
1
1
0
1
1
0
0
0
1
0
0
0
1
1
0
0
1
0
0
0
0
1
0
0
1
1
1
0
0
1
0
0
0
1
0
0
1
0
1
0
0
1
0
1
0
0
0
0
1
0
1
1
0
0
1
1
0
0
0
0
1
0
0
1
0
0
1
0
1
0
0
0
0
1
0
1
0
1
0
1
0
0
0
0
0
0
0
1
0
1
0
0
0
1
0
0
0
0
1
1
1
0
0
0
0
1
0
0
0
0
1
0
1
0
0
0
1
0
0
0
0
1
1
0
0
0
1
0
1
0
0
0
0
1
0
0
0
0
1
1
0
0
X
1
X
X
X
X
0
0
0
0
0
0
1
0
X
X
X
X
0
0
0
1
1
1
0
0
X
1
1
1
0
0
0
0
0
0
0
0
X
0
0
0
0
0
0
0
0
0


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