- 您现在的位置：买卖IC网 > PDF目录43898 > L292 (STMICROELECTRONICS) BRUSH DC MOTOR CONTROLLER, 2.5 A, PZFM15 PDF资料下载
参数资料
| 型号： | L292 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSH DC MOTOR CONTROLLER, 2.5 A, PZFM15 |
| 封装： | MULTIWATT-15 |
| 文件页数： | 9/13页 |
| 文件大小： | 205K |
| 代理商： | L292 |
Obsolete
Product(s)
- Obsolete
Product(s)
5/13
L292
Pin 12 of this chip is the main summing point of the system where TACHO and the D/A converter output
are compared.
The input to D/A converter consists of 5 bit word plus a sign bit supplied by the microprocessor. The sign
bit represets the direction of motor rotation. The (analogue) output of the D/A conveter -DAC/OUT - is com-
pared with the TACHO signal and the risulting error signal is amplified by the error amplifier, and subse-
quently appears on pin 1. The ERRV sognal (from pin 1 , L291) is fed to pin 6 of the final chip, the L292
H-bridge motor-driver. This input signals is bidirectional so it must be converted to a positive signal ba-
cause the L292 uses a single supply voltage. This is accomplished by the first stage - the level shifter,
which uses an internally generated 8 V reference.
This same reference voltage supplies the triangle wave oscillator whose frequency is fixed by the external
RC network (R20, C17 - pins 11 and 10) where:
(with R
≥ 8.2k)
The oscillator determines the switching frequency of the output stage and should be in the range 1 to 30
KHz.
Motor current is regulated by an internal loop in the L292 which is performed by the resistors R18, R19
and the differential current sense amplifier, the output of which is filtered by an external RC network and
fed back to the error amplifier.
The choise of the external components in these RC network (pins 5, 7, 9) is determined by the motor type
and the bandwidth requirements. The values shown in the diagram are for a 5
, 5 MH motor. (See L292
Transfer Function Calculation in Application Information).
The error signal obtained by the addition of the input and the current feedback signals (pin 7) is used to
pulse width modulate the oscillator signal by means of the comparator. The pulse width modulated signal
controls the duty cycle of the Hbridge to give an output current corresponding to the L292 input signal.
The interval between one side of the bridge switching off and the other switching on, t, is programmed by
C17 in conjuction with an internal resistor Rt. This can be foud from:
τ = Rτ Cpin10. (C17 in the diagram)
Since R
τ is approximately 1.5 K and the recommended t to avoid simultaneous conduction is 2.5s Cpin
10 should be around 1.5 nF.
The current sense resistors R18 and R19 should be high precision types (maximum tolerance ± 2 %) and
the recommended value is given by:
Rmax Io max ≤ 0.44V
It is possible to synchronize two L292 ’s, if desired, using the network shown in fig. 2.
Finally, two enable inputs are provited on the L292 (pins 12 and 13-active low and high respectively). Thus
the output stage may be inhibited by taking pin 12 high or by taking pin 13 low. The output will also be
inhibited if the supply voltage falls below 18V.
The enable inputs were implemented in this way because they are intended to be driven directly by a mi-
croprocessor. Currently available microprocessors may generates spikes as high as 1.5V during power-
up. These inputs may be used for a variety of applications such as motor inhibit during reset of the logical
system and power-on reset (see fig. 3).
1f
osc
1
2RC
------------
=
相关PDF资料 |
PDF描述 |
|---|---|
| L296 | 7.5 A SWITCHING REGULATOR, 200 kHz SWITCHING FREQ-MAX, PZFM15 |
| L296PHT | 7 A SWITCHING REGULATOR, 200 kHz SWITCHING FREQ-MAX, PZFM15 |
| L296P | 7 A SWITCHING REGULATOR, 200 kHz SWITCHING FREQ-MAX, PZFM15 |
| L297/1 | STEPPER MOTOR CONTROLLER, PDIP20 |
| L297D013TR | STEPPER MOTOR CONTROLLER, PDSO20 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| L292 | 制造商:STMicroelectronics 功能描述:IC SWITCH MODE DRIVER 292 |
| L292_03 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:SWITCH-MODE DRIVER FOR DC MOTORS |
| L292B | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
| L292H | 功能描述:马达/运动/点火控制器和驱动器 DC Switch-Mode RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| L293 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:PUSH-PULL FOUR CHANNEL DRIVER WITH DIODES |
发布紧急采购，3分钟左右您将得到回复。