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參數(shù)資料
| 型號： | L297 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | STEPPER MOTOR CONTROLLERS |
| 中文描述： | 步進電機控制器 |
| 文件頁數(shù)： | 4/11頁 |
| 文件大小： | 102K |
| 代理商： | L297 |
N
°
NAME
FUNCTION
19
HALF/FULL
Half/full step selectinput.When high selects half step operation,
when low selects full step operation. One-phase-on full step mode
is obtained by selecting FULL when the L297’s translator is at an
even-numbered state.
Two-phase-on full step mode isset by selecting FULL when the
translator is at an odd numbered position. (The home position is
designate state 1).
20
RESET
Reset input.An active low pulse on this input restores the
translator to the home position (state 1, ABCD = 0101).
PIN FUNCTIONS- L297/L297D
(continued)
CIRCUIT OPERATION
The L297 is intended for use with a dual bridge
driver, quad darlington array or discrete power
devices in step motor driving applications. It re-
ceivesstep clock,directionand modesignals from
the systems controller (usually a microcomputer
chip) and generatescontrol signals for the power
stage.
Theprincipalfunctionsare a translator,which gen-
erates the motor phase sequences, and a dual
PWMchoppercircuitwhichregulatesthecurrentin
themotorwindings.The translatorgeneratesthree
different sequences, selected by the HALF/FULL
input. These are normal (two phases energised),
wave drive (one phase energised) and half-step
(alternately one phase energised/two phases en-
ergised).Two inhibit signals are alsogenerated by
theL297 in half stepand wavedrivemodes.These
signals,whichconnectdirectlyto the L298’senable
inputs, are intended to speed current decay when
a winding is de-energised.When the L297 is used
to drivea unipolarmotorthechopperactson these
lines.
AninputcalledCONTROLdetermineswhetherthe
chopper will act on the phase lines ABCD or the
inhibit lines INH1 and INH2.When the phaselines
arechoppedthe non-activephaseline of eachpair
(ABor CD)is activated(ratherthaninterruptingthe
linethen active).In L297 +L298 configurationsthis
technique reduces dissipation in the load current
senseresistors.
A common on-chiposcillatordrivesthe dual chop-
per.It suppliespulses at thechopperratewhichset
thetwoflip-flopsFF1and FF2.Whenthe currentin
awindingreachesthe programmedpeakvaluethe
voltage across the sense resistor (connected to
one of the sense inputs SENS
1
or SENS
2
) equals
V
ref
and the corresponding comparator resets its
flip flop,interrupting the drive currentuntil the next
oscillator pulse arrives. The peak current for both
windingsis programmedbya voltagedivideron the
V
ref
input.
Ground noise problems in multiple configurations
can be avoided by synchronising the chopper os-
cillators.This is done by connectingall the SYNC
pins together,mounting the oscillator RC network
on one deviceonly and groundingthe OSCpin on
all other devices.
Symbol
R
th-j-amb
Parameter
DIP20
80
SO20
100
Unit
°
C/W
Thermal resistance junction-ambient
max
THERMALDATA
4/11
L297-L297D
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L297D | STEPPER MOTOR CONTROLLERS |
| L3000NSO | SLIC KIT OPTIMIZED FOR APPLICATIONS WITH BOTH FIRST AND SECOND GENERATION COMBOS |
| L3000N | Subscriber Line Interface(用戶線路接口設(shè)備) |
| L3030 | Subscriber Line Interface(用戶線路接口設(shè)備) |
| L3000S | SLIC Kit Optimized for Applications with Both First and Second Generation Combos(用于短波/超短波通信系統(tǒng)的用戶線接口) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L297/1 | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Stepper Motor RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| L297/1 | 制造商:STMicroelectronics 功能描述:IC STEPPER MOTOR CONTROLLER |
| L2971 | 制造商:STMicroelectronics 功能描述:Stepper motor controller,L297/1 DIP20 |
| L297A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Stepper Motor Controller/Driver |
| L297D | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Stepper Motor RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
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