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參數(shù)資料
| 型號： | L6226Q |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 運動控制電子 |
| 英文描述： | BRUSH DC MOTOR CONTROLLER, 2.8 A, QCC32 |
| 封裝： | 5 X 5 MM, 1 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, VFQFPN-32 |
| 文件頁數(shù)： | 4/29頁 |
| 文件大小： | 480K |
| 代理商： | L6226Q |
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Circuit description
L6226Q
12/29
Doc ID 14335 Rev 5
4.3
Truth table
4.4
Non-dissipative overcurrent detection and protection
An overcurrent detection circuit (OCD) is integrated. This circuit can be used to provides
protection against a short circuit to ground or between two phases of the bridge as well as a
roughly regulation of the load current. With this internal over current detection, the external
current sense resistor normally used and its associated power dissipation are eliminated.
Figure 9 shows a simplified schematic of the overcurrent detection circuit for the bridge A.
bridge B is provided of an analogous circuit.
To implement the over current detection, a sensing element that delivers a small but precise
fraction of the output 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 current IREF. When the
output current reaches the detection threshold Isover the OCD comparator signals a fault
condition. When a fault condition is detected, an internal open drain MOS with a pull down
capability of 4 mA connected to OCD pin is turned on. Figure 10 shows the OCD operation.
This signal can be used to regulate the output current simply by connecting the OCD pin to
EN pin and adding an external R-C as shown in Figure 9. The off time before recovering
normal operation can be easily programmed by means of the accurate thresholds of the
logic inputs.
IREF and, therefore, the output current detection threshold are selectable by RCL value,
following the equations:
●
Isover = 2.8 A ± 30 % at -25 °C < TJ < 125 °C if RCL = 0 Ω
(PROGCL connected to GND)
●
Isover =
±10 % at -25 °C < TJ < 125 °C if 5 kΩ < RCL < 40 kΩ
to 40 k
Ω.
The disable time tDISABLE before recovering normal operation can be easily programmed by
means of the accurate thresholds of the logic inputs. It is affected whether by CEN and REN
Table 7.
Truth table
Inputs
Outputs
EN
IN1
IN2
OUT1
OUT2
LX (1)
1.
X = Don't care
X
High Z (2)
2.
High Z = High impedance output
High Z
HL
L
GND
HH
L
Vs
GND
HLH
GND
Vs
HH
H
Vs
11050
R
CL
----------------
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| L6226Q_10 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:DMOS dual full bridge driver |
| L6226QTR | 功能描述:功率驅(qū)動器IC DMOS Full Bridge Driver RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 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 |
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| L6227D | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Dual Full Bridge 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(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| L6227DTR | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Dual Full Bridge 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(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
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