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參數(shù)資料
| 型號： | UCC2626DW |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Very low drop voltage regulators with inhibit |
| 中文描述： | 直流電機控制器/驅(qū)動器 |
| 文件頁數(shù)： | 9/19頁 |
| 文件大?。?/td> | 336K |
| 代理商： | UCC2626DW |
SLUS318B
–
APRIL 1999
–
REVISED JANUARY 2002
9
www.ti.com
APPLICATION INFORMATION
configuring the oscillator
The UCC3626 oscillator is designed to operate at frequencies up to 250 kHz and provide a triangle waveform
on CT with a peak-to-peak amplitude of 5 V for improved noise immunity. The current used to program CT is
derived from the R_TACH resistor according to the following equation:
I
OSC
25
R_TACH
Amps
The oscillator frequency is set by R_TACH and CT according to the following relationship:
f
OSC
2.5
R_TACH
CT
Hz
Timing resistor values should be between 25 k
and 500 k
,
while capacitor values should be between 100 pF
and 1
μ
F. Figure 3 provides a graph of oscillator frequency for various combinations of timing components. As
with any high-frequency oscillator, timing components should be located as close as possible to the device pins
when laying out the printed-circuit board. It is also important to reference the timing capacitor directly to the
ground pin on the UCC3626 rather than daisy chaining it to another trace or the ground plane. This technique
prevents switching current spikes in the local ground from causing jitter in the oscillator.
synchronizing the oscillator
A common system specification is to have all oscillators synchronized to a master clock. The UCC3626 provides
a SYNCH input for this purpose. The SYNCH input is designed to interface with a digital clock pulse generated
by the master oscillator. A positive-going edge on this input causes the UCC3626 oscillator to begin discharging.
In order for the slave oscillator to function properly, it must be programmed for a frequency slightly lower than
that of the master. Also, a resistor equal to R_TACH must be placed in parallel with CT. Figure 4 illustrates the
waveforms for a slave oscillator programmed to 20 kHz with a master frequency of 30 kHz. The SYNCH pin
must be grounded when not used.
Figure 3
1.E+03
1.E+04
1.E+05
1.E+06
1.E
–
10
1.E
–
09
1.E
–
08
1.E
–
07
R_TACH = 25 k
R_TACH = 100 k
R_TACH = 500 k
R_TACH = 250 k
CT
–
Oscillator Timing Capacitance
–
F
f
–
–
OSCILLATOR FREQUENCY
vs
TIMING CAPACITANCE
(1)
(2)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UCC2626N | Very low drop voltage regulators with inhibit |
| UCC2626PW | Very low drop voltage regulators with inhibit |
| UCC3626DW | 1.2 V to 37 V adjustable voltage regulators |
| UCC3626N | 1.2 V to 37 V adjustable voltage regulators |
| UCC3626PW | 1.2 V to 37 V adjustable voltage regulators |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UCC2626DWG4 | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Brushless DC Motor Controller 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 |
| UCC2626DWTR | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Brushless DC Motor Controller 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 |
| UCC2626DWTRG4 | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Brushless DC Motor Controller 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 |
| UCC2626N | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Brushless DC 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 |
| UCC2626NG4 | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Brushless DC 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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