DataSheet8.cn


PDF ( 数据手册 , 数据表 ) L9341H

零件编号 L9341H
描述 QUAD LOW SIDE DRIVER
制造商 STMicroelectronics
LOGO STMicroelectronics LOGO 


1 Page

No Preview Available !

L9341H 数据手册, 描述, 功能
L9341
DU/DT AND DI/DT CONTROL
PWM CONTROLLED OUTPUT CURRENT
SHORT CURRENT PROTECTION AND DI-
AGNOSTIC
INTEGRATED FLYBACK DIODE
UNDERVOLTAGE SHUTDOWN
OVERVOLTAGE AND UNDERVOLTAGE DI-
AGNOSTIC
OVERTEMPERATURE DIAGNOSTIC
DESCRIPTION
The L9341 is a monolithic integrated circuit real-
ized in Multipower BCD-II mixed technology. The
driver is intended for inductive loads in synchro-
nous PWM applications, especially for valve driv-
QUAD LOW SIDE DRIVER
AVANCE DATA
MULTIPOWER BCD TECHNOLOGY
Multiwatt 15
ORDERING NUMBERS: L9341V
L9341H
ers. The output voltage and current rise and fall
slopes du/dt and di/dt are controlled.
BLOCK & APPLICATION DIAGRAM
Vcc VCC
4
I cc
10uF
10nF
REXT
12
R ext
12.4k
RES1
9
RES2
10
CS
3
SCLK
11
SDI
5
SDO
13
OSC
6
C
OSC
UNDERVOLTAGE
SHUTDOWN
THERMAL
FLAG
BIAS
SERIAL
INTERFACE
&
PWM
CONTROLL
GND
8
I
GND
Vs
Is
VS
7
DIAGNOSTIC
COMP1
COMP2
V
flyth
V
offth
DRIVER
di / dt & du / dt
CONTROL
SHORT
CURRENT
PROTECTION
I outs
CHANNEL 1
CHANNEL 2
CHANNEL 3
CHANNEL 4
220nF
CD
BAT
BAT
OUT1
2
IOUT1
10nF
C
O1
OUT2
1
I
OUT2
C
O2
10nF
OUT3
15
I
OUT3
C
O3
10nF
OUT4
14
IOUT4
C
O4
10nF
March 1994
1/10
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.







L9341H pdf, 数据表
L9341
FUNCTIONAL DESCRIPTION
The U511 is a PWM quad low side driver for in-
ductive loads. The duty cycle of the internal gen-
erated PWM signal is set by a microcontroller via
a serial interface for each output. An output slope
limitation for both dv/dt and di /dt is implemented
to reduce RFI. The PWM generation is realized
avoiding a simultaneous output switching. As a
result, di/dt becomes smaller. Integrated flyback
diodes clamp the output voltage during the fly-
back phase of the low side switches.
The driver is protected against short circuit. An
undervoltage shutdown circuit switches off all out-
puts if Vcc is less then Vccu. Below the shutdown
voltage all outputs remain in off state regardless
of the input state. After each malfunction which
resets the driver, only the serial link interface can
reactivate the normal function. In case of overcur-
rent (Iout = Iout1), an internal comparator switches
the output off. The overcurrent information can be
read via the serial link for each driver separately
at the negative edge of the corresponding PWM
signal.
The interface to the microcontroller is realized
with a 16 bit synchronous serial peripheral inter-
face (SPI). If CS is switched low, the serial link
becomes active and SDO goes to low impedance.
At the rising edge of the SCLK signal, one of the
16 bit of data stored in a shift register appear se-
quencely at SDO. These data contain the 8 error
flags, the status of thermal diagnostic flag and the
external reset sources RES1, RES2 and the over-
current flgs c1...c4. The last bit is framing infor-
mation (see fig. 7). At each falling edge of SCLK,
one of the 16 bits of data sent by the microcon-
troller is transferred via the SDI input to the driver.
These data contain the duty-cycle information for
the internal PWM generation (4 times 4 bit).
On the rising edge of CS the previously stored in-
formation is transferred to the circuits. SDO be-
come now high impedance and SDI is inactive.
The serial interface of the QLSD is cascadable
with the serial link interface of another QLSD,
thus obtaining a 32 bit serial link information wich
can control eight inductive loads. For a safety
data transfer the takeover of data bits is only real-
ized when the number of SCLK - clocks is n x 16
(n 1).
The PWM duty cycle is set by 4 bit for each out-
put independently via the serial link. If all four bits
for an output are zero, the output is turned off, but
the error diagnosis will work correctly (see fig. 5
and 6). The PWM frequency is defined by an ex-
ternal capacitor on the OSC pin. Rext defines
through the reference current the output current
slope, the diagnostic current sink and the internal
oscillator frequency (together with Cosc).
For error diagnosis the voltage on the output is
measured during the on and off state of the par-
ticular output driver. Upon the rising edge of the
PWM signal (at this moment the power output is
off and will be switched on) the status of COMP1
is stored into an internal latch. On the falling edge
of the PWM signal ( the power output is on and
will be switched off) the status of COMP2 is
stored into another internal latch. This information
can be read via the serial link for each output
driver separately (see fig. 7).
The thermal diagnostic switch the thermal flag to
0 in case of overtemperature T Tsd. It will be
switched to 1 with the hysteresis Tsdth in case of
T < Tsd - Tsdh.
To avoid male functions due to extensive noise or
spikes at the supply pins VCC, VS and Rext must
be blocked externally via capacitors.
8/10














页数 10 页
下载[ L9341H.PDF 数据手册 ]


分享链接

Link :

推荐数据表

零件编号描述制造商
L9341QUAD LOW SIDE DRIVERSTMicroelectronics
STMicroelectronics
L9341HQUAD LOW SIDE DRIVERSTMicroelectronics
STMicroelectronics
L9341VQUAD LOW SIDE DRIVERSTMicroelectronics
STMicroelectronics

零件编号描述制造商
STK15C88256-Kbit (32 K x 8) PowerStore nvSRAMCypress Semiconductor
Cypress Semiconductor
NJM4556DUAL HIGH CURRENT OPERATIONAL AMPLIFIERNew Japan Radio
New Japan Radio
EL1118-G5 PIN LONG CREEPAGE SOP PHOTOTRANSISTOR PHOTOCOUPLEREverlight
Everlight


DataSheet8.cn    |   2020   |  联系我们   |   搜索  |  Simemap