參數(shù)資料
型號： L297D
廠商： 意法半導體
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： L297D
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
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相關代理商/技術參數(shù)
參數(shù)描述
L297D013TR 功能描述:馬達/運動/點火控制器和驅動器 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 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube
L298 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:DUAL FULL-BRIDGE DRIVER
L298 WAF 制造商:Texas Instruments 功能描述:
L298HN 功能描述:馬達/運動/點火控制器和驅動器 Dual Full Bridge 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 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube
L298HN 制造商:STMicroelectronics 功能描述:IC - Full Bridge Driver
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