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參數(shù)資料
| 型號(hào)： | L9341 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | QUAD LOW SIDE DRIVER |
| 中文描述： | 四路，低側(cè)驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 8/10頁(yè) |
| 文件大小： | 130K |
| 代理商： | 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 outputslope
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 thelow sideswitches.
The driver is protected against short circuit. An
undervoltageshutdown circuit switches off all out-
puts if V
cc
is less then V
ccu
. 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 (I
out
= I
out1
), an internal comparator switches
the output off. The overcurrent informationcan 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
becomesactive and SDO goes to lowimpedance.
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 statusof thermaldiagnostic flag and the
external reset sourcesRES1, 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 internalPWMgeneration (4 times4 bit).
On the rising edge of CS the previouslystored 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 takeoverof 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 independentlyvia the serial link. If all four bits
for an output are zero, theoutput 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(togetherwith C
osc
).
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 fallingedge
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
≥
T
sd
. It will be
switched to 1 with the hysteresis T
sdth
in case of
T < T
sd
- T
sdh
.
To avoid male functionsdue to extensive noise or
spikes at the supply pins V
CC
, V
S
and R
ext
must
be blocked externallyvia capacitors.
L9341
8/10
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| L9341H | QUAD LOW SIDE DRIVER |
| L9346 | QUAD INTELLIGENT POWER LOW SIDE SWITCH |
| L9346DIE | QUAD INTELLIGENT POWER LOW SIDE SWITCH |
| L9346PD | CAP CER 820PF 3.15KVDC R3 RAD |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L9341H | 功能描述:功率驅(qū)動(dòng)器IC Quad 24V 2A Lo-Side RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類(lèi)型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| L9341V | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:QUAD LOW SIDE DRIVER |
| L9346 | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:QUAD INTELLIGENT POWER LOW SIDE SWITCH |
| L9346DIE | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:QUAD INTELLIGENT POWER LOW SIDE SWITCH |
| L9346PD | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:QUAD INTELLIGENT POWER LOW SIDE SWITCH |
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