參數(shù)資料
型號(hào)： L6226D
廠商： STMICROELECTRONICS
元件分類： 運(yùn)動(dòng)控制電子
英文描述： BRUSHLESS DC MOTOR CONTROLLER, 2.8 A, PDSO24
封裝： SO-24
文件頁(yè)數(shù)： 5/31頁(yè)
文件大小： 525K
代理商： L6226D
L6226
Circuit description
Doc ID 9452 Rev 4
13/31
4.3
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 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 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 = 2.8A ±30% at -25°C < Tj < 125 °C if RCL = 0 Ω (PROGCL connected to GND)
●
Isover = 11050 / RCL ±10% at -25 °C < Tj < 125 °C if 5 kΩ < RC < 40 kΩ
Figure 11 shows the output current protection threshold versus RCL value in the range 5 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 values and its
magnitude is reported in Figure 12. The delay time tDELAY before turning off the bridge when
an overcurrent has been detected depends only by CEN value. Its magnitude is reported in
CEN is also used for providing immunity to pin EN against fast transient noises. Therefore
the value of CEN should be chosen as big as possible according to the maximum tolerable
delay time and the REN value should be chosen according to the desired disable time.
The resistor REN should be chosen in the range from 2.2 kΩ to 180 kΩ. Recommended
values for REN and CEN are respectively 100 kΩ and 5.6 nF that allow obtaining 200 s
disable time.
相關(guān)PDF資料
PDF描述
L6226PD BRUSHLESS DC MOTOR CONTROLLER, 2.8 A, PDSO36
L6226QTR BRUSH DC MOTOR CONTROLLER, QCC32
L6226Q BRUSH DC MOTOR CONTROLLER, 2.8 A, QCC32
L6227N STEPPER MOTOR CONTROLLER, 2.8 A, PDIP24
L6228Q STEPPER MOTOR CONTROLLER, 2.8 A, QCC32
相關(guān)代理商/技術(shù)參數(shù)
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L6226DTR 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)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
L6226N 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)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
L6226PD 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)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
L6226PDTR 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)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
L6226Q 功能描述:功率驅(qū)動(dòng)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(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
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