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| 型号： | 5962-9168902VYA |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, CDIP28 |
| 封装： | HERMETIC SEALED, CERAMIC, DIP-28 |
| 文件页数： | 4/21页 |
| 文件大小： | 298K |
| 代理商： | 5962-9168902VYA |
SLUSAG8A
– SEPTEMBER 2011 – REVISED SEPTEMBER 2011
Power Stage Design
The UC1625 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 9 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 UC1625 (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 2, the circuit of Fig. B can also sense average current.
12
Copyright
2011, Texas Instruments Incorporated
Product Folder Link(s) :UC1625-SP
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| 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 |
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| 5962-9169301M2A | 制造商:Texas Instruments 功能描述:-LIFETIME BUYS TIL 03/03 |
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