Motor and Fan Controllers
Overview
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
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 | +-3.5 to +-15 | +-2.5 to 22 | 0.1 | 5-350 | -55-125 | |
SG2731 | X | X | +-3.5 to +-15 | +-2.5 to 22 | 0.1 | 5-350 | -25-85 | ||||
SG3731 | X | X | +-3.5 to +-15 | +-2.5 to 22 | 0.1 | 5-350 | 0-70 |