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參數(shù)資料
| 型號： | L6235PD |
| 廠商： | 意法半導體 |
| 英文描述： | DMOS DRIVER FOR THREE-PHASE BRUSHLESS DC MOTOR |
| 中文描述： | DMOS的驅(qū)動三相無刷直流電動機 |
| 文件頁數(shù)： | 16/25頁 |
| 文件大?。?/td> | 434K |
| 代理商： | L6235PD |
L6235
16/25
NON-DISSIPATIVE OVERCURRENT DETECTION and PROTECTION
The L6235 integrates an Overcurrent Detection Circuit (OCD) for full protection. This circuit provides Output-to-
Output and Output-to-Ground short circuit protection as well. With this internal over current detection, the exter-
nal current sense resistor normally used and its associated power dissipation are eliminated. Figure 17 shows
a simplified schematic for the overcurrent detection circuit.
To implement the over current detection, a sensing element that delivers a small but precise fraction of the out-
put current is implemented with each High Side power MOS. Since this current is a small fraction of the output
current there is very little additional power dissipation. This current is compared with an internal reference cur-
rent I
REF
. When the output current reaches the detection threshold (typically I
SOVER
= 5.6A) the OCD compar-
ator signals a fault condition. When a fault condition is detected, an internal open drain MOS with a pull down
capability of 4mA connected to pin DIAG is turned on.
The pin DIAG can be used to signal the fault condition to a
μ
C or to shut down the Three-Phase Bridge simply
by connecting it to pin EN and adding an external R-C (see R
EN
, C
EN
).
Figure 17. Overcurrent Protection Simplified Schematic
Figure 18 shows the Overcurrent Detetection operation. The Disable Time t
DISABLE
before recovering normal
operation can be easily programmed by means of the accurate thresholds of the logic inputs. It is affected
whether by C
EN
and R
EN
values and its magnitude is reported in Figure 19. The Delay Time t
DELAY
before turn-
ing off the bridge when an overcurrent has been detected depends only by C
EN
value. Its magnitude is reported
in Figure 20.
C
EN
is also used for providing immunity to pin EN against fast transient noises. Therefore the value of C
EN
should be chosen as big as possible according to the maximum tolerable Delay Time and the R
EN
value should
be chosen according to the desired Disable Time.
The resistor R
EN
should be chosen in the range from 2.2K
to 180K
. Recommended values for R
EN
and C
EN
are respectively 100K
and 5.6nF that allow obtaining 200
μ
s Disable Time.
+
OVER TEMPERATURE
I
REF
I
REF
I
1
+I
2
/ n
I
1
/ n
HIGH SIDE DMOS
POWER SENSE
1 cell
POWER SENSE
1 cell
POWER SENSE
1 cell
POWER DMOS
n cells
POWER DMOS
n cells
POWER DMOS
n cells
HIGH SIDE DMOS
HIGH SIDE DMOS
OUT
1
OUT
2
VS
A
OUT
3
VS
B
I
1
I
2
I
3
I
2
/ n
I
3
/ n
OCD
COMPARATOR
TO GATE
LOGIC
INTERNAL
OPEN-DRAIN
R
DS(ON)
40
C
EN
R
EN
DIAG
EN
V
DD
μ
C or LOGIC
D02IN1381
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6235PD013TR | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Three Phase Motor RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| L6235Q | 功能描述:馬達/運動/點火控制器和驅(qū)動器 DMOS 3-Phase DC 5.6A 0.3 Ohm 100kHz RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| L6235QTR | 功能描述:馬達/運動/點火控制器和驅(qū)動器 DMOS 3-Phase Brushless DC Motor RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| L6236 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Industrial Control IC |
| L6237 | 制造商:STMicroelectronics 功能描述:BRUSHLESS DC MOTOR CONTROLLER, 2 A, 64 Pin Plastic QFP |
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