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參數(shù)資料
| 型號(hào)： | A3935KLQ |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | 3-PHASE POWER MOSFET CONTROLLER |
| 中文描述： | 3相功率MOSFET控制器 |
| 文件頁(yè)數(shù)： | 10/16頁(yè) |
| 文件大?。?/td> | 317K |
| 代理商： | A3935KLQ |
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3935
THREE-PHASE POWER
MOSFET CONTROLLER
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
10
Functional Description
Motor Lead Protection.
A fault detection circuit monitors
the voltage across the drain to source of the external MOSFETs.
A fault is asserted “l(fā)ow” on the output terminal, FAULT, if the
drain-to-source voltage of any MOSFET that is instructed to turn
on is greater than the voltage applied to the V
DSTH
input terminal.
When a high-side switch is turned on, the voltage from V
DRAIN
to
the appropriate motor phase output, V
SX
, is examined. If the
motor lead is shorted to ground before the high side is turned on,
the measured voltage will exceed the threshold and the FAULT
terminal will go “l(fā)ow”. Similarly, when a low-side MOSFET is
turned on, the differential voltage between the motor phase
(drain) and the LSS terminal (source) is monitored. V
DSTH
is set
by a resistor divider to V
DD
.
The V
DRAIN
is intended to be a Kelvin connection for the high-
side, drain-source monitor circuit. Voltage drops across the
power bus are eliminated by connecting an isolated PCB trace
from the V
DRAIN
terminal to the drain of the MOSFET bridge.
This allows improved accuracy in setting the V
DSTH
threshold
voltage. The low-side, drain-source monitor uses the LSS
terminal, rather than V
DRAIN
, in comparing against V
DSTH
.
The A3935 merely reports these motor faults.
Fault Outputs.
Transient faults on any of the fault outputs are
to be expected during switching and will not disable the gate
drive outputs. External circuitry or controller logic must
determine if the faults represent a hazardous condition.
FAULT.
This terminal will go active “l(fā)ow” when any of the
following conditions occur:
V
BAT
overvoltage,
V
BAT
undervoltage,
V
REG
undervoltage,
Motor lead short-to-ground,
Motor lead short-to-supply (or battery),
Bridge (or V
DRAIN
) open,
V
DD
undervoltage, or
Thermal shutdown.
OVFLT.
Asserts “high” when a V
BAT
overvoltage fault occurs
and resets “l(fā)ow” after a recovery hysteresis. It has a high-
impedance state when a thermal shutdown or V
DD
undervoltage
occurs. The voltage at the OVSET terminal, V
OVSET
, controls
the V
BAT
overvoltage set point V
BAT(ov)
, i.e.,
V
BAT(ov)
= (K
BAT(ov)
x V
SET(ov)
) + V
BAT(ov)
(0),
where K
BAT(ov)
is the gain (12) and V
BAT(ov)
(0) is the value of
V
BAT(ov)
when V
SET(ov)
is zero (~22.4). For valid formula, all
variables must be in range and below maximum operating
specification.
UVFLT.
Asserts “high” when a V
BAT
undervoltage fault occurs
and resets “l(fā)ow” after a recovery hysteresis. It has a high-
impedance state when a thermal shutdown or V
DD
undervoltage
occurs. OVFLT and UVFLT are mutually exclusive by defini-
tion.
Current Sensing.
A current-sense amplifier is provided to
allow system monitoring of the load current. The differential
amplifier inputs are intended to be Kelvin connected across a
low-value sense resistor or current shunt. The output voltage is
represented by:
V
CSOUT
= ( I
LOAD
x A
V
x R
S
) + V
OS
where V
OS
is the output voltage calibrated at zero load current
and A
V
is the differential amplifier gain of about 19.2. If either
the CSP or CSN pin is open, the CSOUT pin will go to its
maximum positive level.
Shutdown.
If a fault occurs because of excessive junction
temperature or undervoltage on V
DD
or V
BAT
, all gate driver
outputs are driven “l(fā)ow” until the fault condition is removed. In
addition, the boost supply switch and the VREG are turned “off”
until those undervoltages and junction temperatures recover.
Boost Supply.
V
BOOST
is controlled by an inner current-
control loop, and by an outer voltage-feedback loop. The
current-control loop turns “off” the boost switch for 5 μs
whenever the voltage across the boost current-sense resistor
exceeds 500 mV. A diode reverse-recovery current flows
through the sense resistor whenever the boost switch turns “on”,
which could turn it “off” again if not for the “blanking time”
circuit. Adjustment of this external sense resistor determines the
maximum current in the inductor. Whenever V
BOOST
exceeds the
predefined threshold, nominally 16 V, the boost switch is
inhibited.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| A3935KLQ-01 | 制造商:Allegro MicroSystems LLC 功能描述: |
| A3935KLQ-T | 功能描述:IC CTRLR MOSFET 3PH 36-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電機(jī)和風(fēng)扇控制器，驅(qū)動(dòng)器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:直流電機(jī)驅(qū)動(dòng)器，步進(jìn)電機(jī)驅(qū)動(dòng)器 評(píng)估套件:- 輸出數(shù):1 或 2 電流 - 輸出:750mA 電壓 - 負(fù)載:10 V ~ 40 V 電源電壓:4.5 V ~ 5.5 V 工作溫度:-20°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-BFSOP（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:24-SOP 包裝:Digi-Reel® 其它名稱:MTS62C19A-HS105DKR |
| A3935KLQTR | 功能描述:IC CTRLR MOSFET 3PH 36-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 電機(jī)和風(fēng)扇控制器，驅(qū)動(dòng)器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:直流電機(jī)驅(qū)動(dòng)器，步進(jìn)電機(jī)驅(qū)動(dòng)器 評(píng)估套件:- 輸出數(shù):1 或 2 電流 - 輸出:750mA 電壓 - 負(fù)載:10 V ~ 40 V 電源電壓:4.5 V ~ 5.5 V 工作溫度:-20°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-BFSOP（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:24-SOP 包裝:Digi-Reel® 其它名稱:MTS62C19A-HS105DKR |
| A3935KLQTR-T | 功能描述:IC CTLR MOSFET 3PH AUTO 36-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電機(jī)和風(fēng)扇控制器，驅(qū)動(dòng)器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:直流電機(jī)驅(qū)動(dòng)器，步進(jìn)電機(jī)驅(qū)動(dòng)器 評(píng)估套件:- 輸出數(shù):1 或 2 電流 - 輸出:750mA 電壓 - 負(fù)載:10 V ~ 40 V 電源電壓:4.5 V ~ 5.5 V 工作溫度:-20°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-BFSOP（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:24-SOP 包裝:Digi-Reel® 其它名稱:MTS62C19A-HS105DKR |
| A3936-0000T | 制造商:3M 制造商全稱:3M Electronics 功能描述:100 x 100, PCB Two Row |
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