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参数资料
| 型号： | 5962-9168902VYA |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, CDIP28 |
| 封装： | HERMETIC SEALED, CERAMIC, DIP-28 |
| 文件页数： | 19/21页 |
| 文件大小： | 298K |
| 代理商： | 5962-9168902VYA |
SLUSAG8A
– SEPTEMBER 2011 – REVISED SEPTEMBER 2011
DEVICE INFORMATION
Terminal Functions
TERMINAL
DESCRIPTION
NAME
NO.
The position decoder logic translates the Hall signals and the DIR signal to the correct driver
signals (PUs and PDs). To prevent output stage damage, the signal on DIR is first loaded
into a direction latch, then shifted through a two-bit register.
As long as SPEED-IN is less than 250 mV, the direction latch is transparent. When
SPEED-IN is higher than 250 mV, the direction latch inhibits all changes indirection.
SPEED-IN can be connected to TACH-OUT through a filter, so that the direction latch is only
transparent when the motor is spinning slowly, and has too little stored energy to damage
power devices.
Additional circuitry detects when the input and output of the direction latch are different, or
DIR, SPEED-IN
6, 7
when the input and output of the shift register are different, and inhibits all output drives
during that time. This can be used to allow the motor to coast to a safe speed before
reversing.
The shift register ensures that direction can not be changed instantaneously. The register is
clocked by the PWM oscillator, so the delay between direction changes is always going to be
between one and two oscillator periods. At 40 kHz, this corresponds to a delay of between
25
μs and 50 μs. Regardless of output stage, 25 μs deadtime should be adequate to ensure
no overlap cross-conduction. Toggling DIR causes an output pulse on TACH-OUT
regardless of motor speed.
E/A IN(+) and E/A IN(
–) are not internally committed to allow for a wide variety of uses. They
can be connected to the ISENSE, to TACH-OUT through a filter, to an external command
voltage, to a D/A converter for computer control, or to another op amp for more elegant
feedback loops. The error amplifier is compensated for unity gain stability, so E/A OUT can
be tied to E/A IN(
–) for feedback and major loop compensation.
E/A IN(+), E/A IN(
–), E/A
1, 28, 27, 26
E/A OUT and PWM In drive the PWM comparator. For voltage-mode PWM systems, PWM In
OUT, PWM IN
can be connected to RC-OSC. The PWM comparator clears the PWM latch, commanding
the outputs to chop.
The error amplifier can be biased off by connecting E/A IN(
–) to a higher voltage than /EA
IN(+). When biased off, E/A OUT appears to the application as a resistor to ground. E/A OUT
can then be driven by an external amplifier.
GND
15
All thresholds and outputs are referred to the GND pin except for the PD and PU outputs.
The three shaft position sensor inputs consist of hysteresis comparators with input pullup
resistors. Logic thresholds meet TTL specifications and can be driven by 5-V CMOS, 12-V
CMOS, NMOS, or open-collectors.
Connect these inputs to motor shaft position sensors that are positioned 120 electrical
degrees apart. If noisy signals are expected, zener clamp and filter these inputs with 6-V
H1, H2, H3
8, 9, 10
zeners and an RC filter. Suggested filtering components are 1 k
and 2 nF. Edge skew in
the filter is not a problem, because sensors normally generate modified gray code with only
one output changing at a time, but rise and fall times must be shorter than 20
μs for correct
tachometer operation. Motors with 60 electrical degree position sensor coding can be used if
one or two of the position sensor signals is inverted.
The current sense amplifier has a fixed gain of approximately two. It also has a built-in level
shift of approximately 2.5 V. The signal appearing on ISENSE is:
ISENSE = 2.5 V + (2 × ABS ( ISENSE1 – ISENSE2) )
ISENSE1 and ISENSE2 are interchangeable and can be used as differential inputs. The
differential signal applied can be as high as
±0.5 V before saturation.
If spikes are expected on ISENSE1 or ISENSE2, they are best filtered by a capacitor from
ISENSE to ground. Filtering this way allows fast signal inversions to be correctly processed
ISENSE1, ISENSE2,
by the absolute value circuit. The peak-current comparator allows the PWM to enter a
3, 4, 5
ISENSE
current-limit mode with current in the windings never exceeding approximately 0.2 V /
RSENSE. The overcurrent comparator provides a fail-safe shutdown in the unlikely case of
current exceeding 0.3 V / RSENSE. Then, softstart is commanded, and all outputs are turned
off until the high current condition is removed. It is often essential to use some filter driving
ISENSE1 and ISENSE2 to reject extreme spikes and to control slew rate. Reasonable
starting values for filter components might be 250-
series resistors and a 5-nF capacitor
between ISENSE1 and ISENSE2. Input resistors should be kept small and matched to
maintain gain accuracy.
This input can be used as an over-voltage shut-down input, as a coast input, or both. This
OV-COAST
23
input can be driven by TTL, 5-V CMOS, or 12-V CMOS.
Copyright
2011, Texas Instruments Incorporated
7
Product Folder Link(s) :UC1625-SP
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