Datasheet.kr   

L9942 데이터시트 PDF




ST Microelectronics에서 제조한 전자 부품 L9942은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


PDF 형식의 L9942 자료 제공

부품번호 L9942 기능
기능 Integrated stepper motor driver for bipolar stepper motors
제조업체 ST Microelectronics
로고 ST Microelectronics 로고


L9942 데이터시트 를 다운로드하여 반도체의 전기적 특성과 매개변수에 대해 알아보세요.




전체 30 페이지수

미리보기를 사용할 수 없습니다

L9942 데이터시트, 핀배열, 회로
www.DataSheet4U.com
L9942
Integrated stepper motor driver for bipolar stepper motors
with microstepping and programmable current profile
PRELIMINARY DATA
Features
Two full bridges for max. 1.3 A load (RDSON =
500 m)
Programmable current waveform with look-up
table: 9 entries with 5bit resolution
Current regulation by integrated PWM
controller and internal current sensing
Programmable stepping mode: Full, Half, Mini
and Microstepping
Programmable slew rate for EMC and power
dissipation optimisation
Programmable Fast-, Slow-, Mixed-and Auto-
Decay Mode
Full-Scale Current programmable with 3bit
resolution
Very low current consumption in standby mode
IS < 3µA, typ. Tj 85 °C
All outputs short circuit protected with
Openload, Overloadcurrent, Temperature
Warning and Thermal Shutdown
The PWM signal of the internal PWM controller
is available as digital output.
All parameters guaranteed for 7V < Vs < 20V
Applications
Stepper Motor Driver for bipolar Stepper Motors in
Automotive Applications like Light Levelling,
Bending Light and Throttle Control.
PowerSSO-24
Description
The device is an integrated stepper motor driver
for bipolar stepper motors with microstepping and
programmable current profile look-up-table to
allow a flexible adaptation of the stepper motor
characteristics and intended operating conditions.
It is possible to use different current profiles
depending on target criteria: audible noise,
vibrations, rotation speed or torque. The decay
mode used in PWM-current control circuit can be
programmed to slow-, fast-, mixed-and auto-
decay. In autodecay mode device will use slow
decay mode if the current for the next step will
increase and the fast decay or mixed decay mode
if the current will decrease.
Order codes
Part number
L9942
Junction Temp range, °C
-40 to 150
Package
PowerSSO-24
Packing
Tube
November 2005
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to
change without notice.
Rev 1
1/37
www.st.com
37




L9942 pdf, 반도체, 판매, 대치품
1 Block diagram and Pin information
1 Block diagram and Pin information
L9942
Figure 1. Block diagram
VCC
STEP
EN
PWM
DO
Oscillator
CP
Charge
Pump
Diagnostic
Gate-Driver
&
PWM-Controller
DI
CLK
CSN
Diagnostic
Gate-Driver
&
PWM-Controller
Biasing
U/I-
Converter
GND
RREF
VBAT
ReversePolarityProtection
VS
QA1
Note: value of capacitor has
to be choosen carefully to
limit the VS voltage below
absolute maximum ratings in
case of an unexpected
freewheeling condition (e.g.
TSD, POR)
QA2
QB1
Stepper
Motor
QB2
GNDP
GND
Figure 2. Pin connection (Top view)
PGND 1
QA1 2
Power SSO24
24 PGND
23 QA2
VS 3
22 VS
CLK 4
21 EN
DI 5
20 RREF
CSN 6
DO 7
Slug-
down
19 VCC
18 TEST
PWM 8
17 GND
STEP 9
16 CP
VS 10
15 VS
QB1 11
PGND 12
14 QB2
13 PGND
All pins with the same name must be externally connected!
All pins PGND are internally connected to the heat slug.
4/37

4페이지










L9942 전자부품, 판매, 대치품
L9942
2 Device description
protect the device. In order to reactivate the output stages the junction temperature must
decrease below Tj SD -Tj SD HYS and the thermal shutdown bit has to be cleared by the
microcontroller.
2.6 Inductive Loads
Each half bridge is built by an internally connected highside and a lowside power DMOS
transistor. Due to the built-in reverse diodes of the output transistors, inductive loads can be
driven without external free-wheeling diodes. In order to reduce the power dissipation during
free-wheeling condition the PWMcontroller will switch-on the output transistor parallel to the
freewheeling diode (synchronous rectification).
2.7 Cross-current protection
The four half-brides of the device are cross-current protected by an internal delay time
depending on the programmed slew rate. If one driver (LS or HS) is turned-off then activation of
the other driver of the same half bridge will be automatically delayed by the cross-current
protection time .
2.8 PWM Current Regulation
An internal current monitor output of each high-side and low-side transistor sources a current
image which has a fixed ratio of the instantaneous load current. This current images are
compared with the current limit in PWM control. Range of limit can reach from programmed full
scale value (register1 DAC Scale) down belonging LSB value of 5 bit DAC (register1 DAC
Phase x). The data of the two 5 bit DACs comes form set up in 9 current profiles (register2 to 6).
If signal changes to logic high at pin STEP then 2 currentprofiles are moved in register1 for
DAC Phase A and B. Number of profile depends on phase counter reading and direction bit in
register0 (Figure 7). The bridges are switched on until the load current sensed at HS switch
exceeds the limit . Load current comparator signal is used to detect open load or overcurrent
condition also.
2.9 Decay modes
During off-time the device will use one of several decay modes programmable by SPI (Figure 4
top). In slow decay mode HS switches are activated after cross current protection time for
synchronous rectification to reduce the power dissipation (Figure 4 detail A). In fast decay
opposite halfbridge will switched on after cross current protection time, that is same like change
in the direction. For mixed decay the duration of fast decay period before slow decay can be set
to a fixed time (Figure 4 detail B continuous line ) or is triggered by under-run of the load current
limit (Figure 4 detail B dashed line), that can be detected at LS switch. The special mode where
the actual phase counter value is taken into account to select the decay mode is called auto
decay (e.g. in Figure 3 Micro Stepping DIR=1). If the absolute value of the current limit is higher
as during step before then PWM control uses slow decay mode always. Otherwise one of the
fast decay modes is automatic selected for a quick decrease of the load current and so it
obtains new lower target value.
7/37

7페이지


구       성 총 30 페이지수
다운로드[ L9942.PDF 데이터시트 ]

당사 플랫폼은 키워드, 제품 이름 또는 부품 번호를 사용하여 검색할 수 있는

포괄적인 데이터시트를 제공합니다.


구매 문의
일반 IC 문의 : 샘플 및 소량 구매
-----------------------------------------------------------------------

IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한
광범위한 전력 반도체를 판매합니다.

전력 반도체 전문업체

상호 : 아이지 인터내셔날

사이트 방문 :     [ 홈페이지 ]     [ 블로그 1 ]     [ 블로그 2 ]



관련 데이터시트

부품번호상세설명 및 기능제조사
L9942

Integrated stepper motor driver for bipolar stepper motors

ST Microelectronics
ST Microelectronics
L9947

QUAD HALF-BRIDGE AND SINGLE HIGH-SIDE DRIVER

STMicroelectronics
STMicroelectronics

DataSheet.kr       |      2020   |     연락처      |     링크모음      |      검색     |      사이트맵