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參數(shù)資料
| 型號(hào)： | A3980KLP |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | Automotive DMOS Microstepping Driver with Translator |
| 中文描述： | 汽車的DMOS微步驅(qū)動(dòng)器，帶有翻譯 |
| 文件頁數(shù)： | 11/18頁 |
| 文件大?。?/td> | 514K |
| 代理商： | A3980KLP |
11
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
D
2
A3980
Automotive DMOS Microstepping Driver with Translator
mixed decay mode, as shown in
fi
gures 5 through 8. As the
trip point is reached, the A3980 goes into fast decay mode
until the voltage on the RC pin decays to the same level as the
voltage applied to the PFD pin. The duration of time that the
bridge operates in fast decay mode, t
FD
(ns), is estimated by
t
FD
= R
T
×
C
T
×
ln[0.6
(V
DD
V
PFD
)]
over a range of values from C
T
= 470 pF to 1500 pF and from
R
T
= 12 k
to 100 k
.
After this fast decay period, the A3980 switches to slow
decay mode for the remainder of the
fi
xed off-time period.
Synchronous Recti
fi
cation
.
When a PWM-off cycle
is triggered by an internal
fi
xed-off-time cycle, load current
recirculates according to the decay mode selected by the
control logic. The synchronous recti
fi
cation feature turns on
the appropriate FETs during current decay, and effectively
shorts out the body diodes with the low DMOS R
DSON
. This
reduces power dissipation signi
fi
cantly, and eliminates the
need for external Schottky diodes. Synchronous recti
fi
cation
has two modes: Active mode and Disabled mode (described
below).
Active Mode.
When the input on the SR terminal is set
at logic low, Active mode is enabled. This mode allows
synchronous recti
fi
cation to occur, but when a zero current
level is detected, it also prevents reversal of the load current
by turning off synchronous recti
fi
cation. This prevents the
motor winding from conducting in the reverse direction.
Disabled Mode.
When the input on the SR terminal is set
at logic high, Disabled mode takes effect. This mode disables
synchronous recti
fi
cation. This mode is typically used when
external diodes are required to transfer power dissipation
from the A3980 package to the external diodes.
Shutdown.
In the event of an overtemperature fault or
an undervoltage fault on VREG, the DMOS outputs of the
A3980 are disabled until the fault condition is removed. In
the case of an overvoltage fault, the sink DMOS FETs are
switched on, and the source FETs off. At power-up, and in
the event of low V
DD
, the UVLO circuit disables the DMOS
outputs until V
DD
reaches the minimum level. Once V
DD
is
above the minimum level, the translator resets to the Home
state and the DMOS outputs are re-enabled.
Thermal Protection
. All drivers are turned off when the
junction temperature reaches the thermal shutdown value,
typically 170
°
C. This is intended only to protect the A3980
from failures due to excessive junction temperatures. Ther-
mal protection will not protect the A3980 from continuous
short circuits, and additional fault diagnostics are integrated for
this purpose. Thermal shutdown has a hysteresis of approxi-
mately 15
°
C.
Diagnostic Features.
The A3980 includes monitor
circuits that can detect shorts to VBB, shorts to ground, and
shorted or open circuit load. Short circuits are detected by
monitoring the voltage across the driving DMOS FETs and
the open load is detected by monitoring the phase current
when the motor is in the Home microstep position. All fault
detection takes place following a delay after the blank time.
Short to VBB.
A short from any of the motor connections
to the battery or VBB connection is detected by monitoring
the voltage across the bottom FETs in each full-bridge. When
the FET is on, the voltage should be no greater than the
V
DSLT
value de
fi
ned in the Electrical Characteristics table.
Short to Ground.
A short from any of the motor connec-
tions to ground is detected by monitoring the voltage across
the top FETs in each full-bridge. When the FET is turned
on, the voltage should be no greater than the V
DSHT
value
de
fi
ned in the Electrical Characteristics table.
Shorted Load.
A short across the load is detected by
monitoring the voltage across both the top and bottom FETs
in each full-bridge.
Short Fault Operation.
Because motor capacitance may
cause the measured voltages to show a fault as the full-bridge
switches, voltages are not sampled until after the blank
time plus an internally-generated delay, t
SCT
. Once a short
circuit has been detected, all outputs for the faulty phase are
disabled until the next step command. At the next step com-
mand, the outputs are re-enabled and the voltage across the
FET is resampled.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| A3980KLP-T | 功能描述:IC MOTOR DRIVER MICROSTEP 28-TSS 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 |
| A3980KLP-T | 制造商:Allegro MicroSystems 功能描述:Driver IC Package/Case:28-TSSOP |
| A3980KLPTR | 功能描述:IC DRIVER MICROSTEPPING 28-TSSOP 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 |
| A3980KLPTR-T | 功能描述:IC DRIVER MICROSTEPPING 28-TSSOP 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:步進(jìn)電機(jī)驅(qū)動(dòng)器，1-2 相，2 相 評(píng)估套件:- 輸出數(shù):1 電流 - 輸出:800mA 電壓 - 負(fù)載:10 V ~ 28 V 電源電壓:4.75 V ~ 5.25 V 工作溫度:-20°C ~ 90°C 安裝類型:表面貼裝 封裝/外殼:28-SOP + 2 翼片裸露焊盤 供應(yīng)商設(shè)備封裝:28-HSOPHC（15.2x7.9） 包裝:剪切帶 (CT) 其它名稱:869-1268-1 |
| A3981 | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:Automotive, Programmable Stepper Driver |
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