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| 型號(hào)： | 5962-9168901MXA |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 2 A, CDIP28 |
| 封裝： | CERAMIC, DIP-28 |
| 文件頁(yè)數(shù)： | 4/23頁(yè) |
| 文件大小： | 466K |
| 代理商： | 5962-9168901MXA |
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Power Stage Design
SLUS353B – NOVEMBER 2003 – REVISED APRIL 2007
APPLICATION INFORMATION (continued)
The UC3625 is useful in a wide variety of applications, including high-power in robotics and machinery. The
power output stages used in such equipment can take a number of forms, according to the intended
performance and purpose of the system. Figure 8 show four different power stages with the advantages and
disadvantages of each.
For high-frequency chopping, fast recovery circulating diodes are essential. Six are required to clamp the
windings. These diodes should have a continuous current rating at least equal to the operating motor current,
since diode conduction duty-cycle can be high. For low-voltage systems, Schottky diodes are preferred. In
higher voltage systems, diodes such as Microsemi UHVP high voltage platinum rectifiers are recommended.
In a pulse-by-pulse current control arrangement, current sensing is done by resistor RS, through which the
transistor's currents are passed (Fig. A, B, and C). In these cases, RD is not needed. The low-side circulating
diodes go to ground and the current sense terminals of the UC3625 (ISENSE1 and ISENSE2) are connected to RS
through a differential RC filter. The input bias current of the current sense amplifier causes a common mode
offset voltage to appear at both inputs, so for best accuracy, keep the filter resistors below 2 k
and matched.
The current that flows through RS is discontinuous because of chopping. It flows during the on time of the power
stage and is zero during the off time. Consequently, the voltage across RS consists of a series of pulses,
occurring at the PWM frequency, with a peak value indicative of the peak motor current.
To sense average motor current instead of peak current, add another current sense resistor (RD in Fig. D) to
measure current in the low-side circulating diodes, and operate in four quadrant mode (pin 22 high). The
negative voltage across RD is corrected by the absolute value current sense amplifier. Within the limitations
imposed by Table 1, the circuit of Fig. B can also sense average current.
12
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| 5962-9168902VYA | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 SPACE-RATE 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 |
| 5962-9169003M3A | 制造商:Analog Devices 功能描述:ADC Single SAR 12-bit Parallel 28-Pin LCC 制造商:Analog Devices 功能描述:ADC SGL SAR 12-BIT PARALLEL 28PIN LCC - Rail/Tube 制造商:Rochester Electronics LLC 功能描述:IC, 12-BIT ADC - Bulk 制造商:Analog Devices Inc. 功能描述:Analog to Digital Converters - ADC IC 12-BIT ADC 制造商:Analog Devices 功能描述:CONVERTER - ADC |
| 5962-9169003MXA | 制造商:Analog Devices 功能描述:ADC Single SAR 12-bit Parallel 28-Pin CDIP 制造商:Analog Devices 功能描述:ADC SGL SAR 12-BIT PARALLEL 28CDIP - Rail/Tube 制造商:Rochester Electronics LLC 功能描述:IC, MONO 12-BIT ADC IC - Bulk 制造商:Analog Devices Inc. 功能描述:Analog to Digital Converters - ADC IC MONO 12-BIT ADC IC 制造商:Analog Devices 功能描述:CONVERTER - ADC |
| 5962-9169004M3C | 制造商:Exar Corporation 功能描述: |
| 5962-9169005M3A | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Analog Devices 功能描述: |
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