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Motor and Fan Controllers
The SGx731 is a pulse width modulator circuit designed specifically for DC motor control. It provides a bi-directional pulse train output in response to the magnitude and polarity of an analog error signal input. The device is useful as the control element in motor-driven servo systems for precision positioning and speed control, as well as in audio modulators and amplifiers using carrier frequencies to 350 KHz.
The circuit contains a triangle waveform oscillator, a wideband operational amplifier for error voltage generation, a summing/scaling network for level-shifting the triangle waveform, externally programmable PWM comparators and dual ±100mA, ±22V totem pole drivers with commutation diodes for full bridge output. A SHUTDOWN terminal forces the drivers into a floating high-impedance state when driven LOW. Supply voltage to the control circuitry and to the output drivers may be from either dual positive and negative supplies, or single-ended.
Packaging options:
J: DIP, 16/18-pin, Ceramic
L: 20-pin, Ceramic Leadless Chip Carrier
N: DIP, 16/18-pin, Plastic, ROHS-compliant
| P/N |
J |
J-8 |
J-D |
L |
L-8 |
N |
Vin Control (V) |
Vin Driver (V) |
Idrive (A) |
Freq. (kHz) |
Trange |
| SG1731 |
X |
X |
X |
X |
X |
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+-3.5 to +-15 |
+-2.5 to 22 |
0.1 |
5-350 |
-55-125 |
| SG2731 |
X |
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X |
+-3.5 to +-15 |
+-2.5 to 22 |
0.1 |
5-350 |
-25-85 | |
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