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参数资料
| 型号： | A4960KJPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 19/35页 |
| 文件大小： | 0K |
| 描述： | IC BLDC CTLR BRUSHLESS 32LQFP |
| 标准包装： | 1 |
| 系列： | * |
| 应用： | * |
| 输出数： | * |
| 电流 - 输出： | * |
| 电压 - 负载： | * |
| 电源电压： | * |
| 工作温度： | * |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-LQFP 裸露焊盘 |
| 供应商设备封装： | 32-LQFP（7x7） |
| 包装： | 标准包装 |
| 其它名称： | 620-1452-6 |
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A4960
Automotive, Sensorless BLDC Controller
I TRIP ≈
V RI
A V × R SENSE
itscorrectoperatingcondition.Thechargepumpwillstabilizein
approximately 3 ms under typical conditions. To allow the A4960
to start-up without requiring external logic input, the RESETN
terminal can be pulled to V BB with an external pull-up resistor.
The?resistor?value?should?be?between?20?and?33?kΩ.
RESETN can also be used to clear any fault conditions without
entering sleep mode by taking it low for the reset pulse time,
t RES . Latched short fault conditions, which disable the outputs,
will be cleared as will the serial fault register.
Current Limit
An integrated fixed off-time PWM current control circuit is
provided to limit the motor current during periods when the
torque demand exceeds the normal operating range. It is also
available at start-up to set the hold torque and the ramp torque
if IDS (Config3 bit 8) is set to 0. The fixed off-time is program-
mable through the serial interface and the current limit is set by
an external sense resistor and a programmable reference voltage
derived from the voltage at the REF input. During normal run-
ning, the internal current control can be used in conjunction with
any external PWM control on the PWM input by ensuring that
the programmable off-time of the internal control circuit is longer
than the maximum off-time of the external PWM signal.
During the start-up sequence, the PWM input is ignored, unless
it is held low in the brake condition. If IDS is set to 0, the current
limit circuit provides full control over the hold torque and accel-
eration torque.
Current sense amplifier
A differential sense amplifier with a gain of 10 is provided to
allow the use of low-value sense resistors or a current shunt as
the current sensing element.
The output of the sense amplifier is compared to an internally
generated reference voltage, V RI , the value of which is pro-
grammed through the serial interface as a ratio of the voltage,
V REF , at the reference input terminal, REF. When the REF ter-
minal is connected to VDD, V REF is then limited to the reference
clamp voltage, V REFC .
where n is a positive integer defined by VR[3:0] (Config1 bits
9:6).
For example, when VR[3:0] contains 1100 (12 in decimal), then
V RI = 81.25%V REF .
V RI is generated by a digital-to-analog converter (DAC) with
V REF as the reference input to the DAC. V RI will therefore scale
directly with V REF .
With the PWM input high, or during start-up when PWM is
ignored, when the outputs of the MOSFETs are turned on, current
increases in the motor winding until it reaches a value given by
approximately:
(3)
where
V RI is defined as above,
A V is the gain of the sense amplifier, typically 10, and
R SENSE is the value of the sense resistor.
At the trip point, the sense comparator switches off any active
high-side MOSFETs and switches on the complementary low-
side MOSFETs. This makes the bridge switch from a drive
configuration, where the current is forced to increase, into a recir-
culation configuration, where the motor inductance causes the
current to recirculate for a fixed duration defined as the off-time.
During this off-time the current will decay at a rate defined by
the motor inductance and the impedance of the MOSFET bridge.
This is classic slow decay PWM current control.
Fixed off-time
The duration of the fixed off-time is set by the contents of
PT[4:0] (Config2 bits 4:0). These five bits contain a positive
integer that determines the off-time derived by division from the
system clock.
The off-time is defined as:
t OFF = 10 μs + ( n × 1.6 μs) (4)
V RI can have a value between 6.25%V REF and 100%V REF
defined as:
V RI = [( n + 1) × 6.25%] × V REF
(2)
where n is a positive integer defined by PT[4:0].
For example, when PT[4:0] contains 11010 (26 in decimal), then
t OFF = 51.6 μs typically.
18
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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| A4960SJPTR-T | 制造商:Allegro MicroSystems LLC 功能描述: |
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