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參數(shù)資料
| 型號(hào)： | MC34923 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國(guó))有限公司 |
| 英文描述： | Full-Bridge PWM Motor Driver(全橋PWM電機(jī)驅(qū)動(dòng)器) |
| 中文描述： | 全橋PWM電動(dòng)機(jī)驅(qū)動(dòng)器（全橋脈寬調(diào)制電機(jī)驅(qū)動(dòng)器） |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 508K |
| 代理商： | MC34923 |
34923
12
Go to: www.freescale.com
PWM Blank Timer
When a source driver turns on, a current spike occurs owing
to the reverse recovery currents of the clamp diodes and/or
switching transients related to distributed capacitance in the
load. To prevent this current spike from erroneously resetting
the source-enable latch, the sense comparator is blanked. The
blank timer runs after the off-time counter (see bits D2–D6) to
provide the programmable blanking function. The blank timer is
reset when PWM/ENABLE is chopped or DIR is changed. For
external PWM control, a DIR change or PWM/ENABLE on will
trigger the blanking function.
Synchronous Rectification
When a PWM off cycle is triggered, either by an PWM/
ENABLE chop command or internal fixed off-time cycle, load
current will recirculate according to the decay mode selected by
the control logic. The 34923 synchronous rectification feature
will turn on the opposite pair of outputs during the current decay
and effectively short out the body diodes with the low R
DS(ON)
driver. This will reduce power dissipation significantly and can
eliminate the need for external Schottky diodes.
Synchronous rectification can be configured in active mode,
passive mode, or disabled via the serial port (bits D11 and
D12).
The active or passive mode selection has no impact in slow-
decay mode. With synchronous rectification enabled, the slow-
decay mode serves as an effective brake mode.
Current Regulation
Load current is regulated by an internal fixed off-time PWM
control circuit. When the outputs of the H-bridge are turned on,
the current increases in the motor winding until it reaches a trip
value determined by the external sense resistor (R
S
), the
applied analog reference voltage (V
REF
), the SPAN logic level,
and serial data bit D16:
When SPAN = D16, I
TRIP
= V
REF
/10R
S
When SPAN
≠
D16, I
TRIP
= V
REF
/5R
S
At the trip point, the sense comparator resets the source-
enable latch, turning off the source driver. The load inductance
then causes the current to recirculate for the serial-port-
programmed fixed off-time period. The current path during
recirculation is determined by the configuration of slow/mixed
current-decay mode (D17) and the synchronous rectification
control bits (D11 and D12).
Internal PWM (Current Mode) PWM Frequency
The internal PWM opeating frequency is set by the sum of
“Off Time”, as determined by bits D2 through D6, “Blank Time”,
as determined by bits D0 and D1, and the time constant of the
motor.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
n
.
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| MC34923DW | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Motor Driver 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 |
| MC34923EG | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Full-Bridge PWM Motor Driver 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 |
| MC34923EGR2 | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 VERSION 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 |
| MC34925 | 制造商:SPC Multicomp 功能描述:HEADER VERTICAL 4WAY 制造商:PRIVATE LABEL 功能描述:HEADER, VERTICAL, 4WAY, Product Range:MULTICOMP - MC34 Series, Contact Terminati 制造商:SPC Multicomp 功能描述:WIRE-BOARD CONNECTOR, RCPT, 4POS, 4.2MM, Series:2266(5566)RA, Pitch Spacing:4.2mm, Contact Termination:Through Hole Vertical, No. of Contacts:4, No. of Rows:1, Connector Mounting:PCB, Gender:Receptacle, Contact Material:Brass , RoHS Compliant: Yes |
| MC34927 | 制造商:SPC Multicomp 功能描述:HEADER VERTICAL 5WAY 制造商:SPC Multicomp 功能描述:HEADER, VERTICAL, 5WAY 制造商:SPC Multicomp 功能描述:WIRE-BOARD CONNECTOR, RCPT, 5POS, 4.2MM; Series:2266(5566)RA; Pitch Spacing:4.2mm; Contact Termination:Through Hole Vertical; No. of Contacts:5; No. of Rows:1; Connector Mounting:PCB; Gender:Receptacle; Contact Material:Brass ;RoHS Compliant: Yes |
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