Description：

The TPA135 is a unidirectional current-sense amplifierwhich has a very wide input common-mode voltage rangefrom −4 V to 80 V with a high bandwidth of 1 MHz.The enhanced PWM rejection allows the TPA135 toaccommodate the solenoids and motors applications. Thedevice features high precision accuracy specifications ofVos and the gain error, which makes it ideal for smallsignal conditioning. Its high bandwidth makes it ideal notonly for DC current measurement, but also for high-speedapplications like fast overcurrent protection.Fixed gains are optional: 20 V/V, 50 V/V, 100 V/V, 200 V/V,and 500 V/V. The device offers breakthrough performancethroughout the temperature range of −40°C to +125°C.The device is offered SOT23-5 package.Many systems, including motors and solenoids, employPWM signals for modulation or control purposes. However,these PWM signals generate fast common-mode voltagetransitions that oscillate between high voltage and groundpotential. This can pose a challenge for the currentmeasurement circuitry, as it may result in undesirableoutput voltage fluctuations. To address this issue, thedevice incorporates an advanced PWM rejection feature.This feature minimizes the impact of common-modevoltage transitions and ensures stable and reliable outputvoltage.

Features：

• Enhanced PWM Rejection

• Wide Common-Mode Voltage

– Operational Voltage: −4 V to 80 V

– Survival Voltage: −10 V to 85 V

• Supply Voltage: 3.0 V to 5.5 V

• Excellent CMRR

– 150-dB DC CMRR

– 115-dB AC CMRR at 50 kHz

• Accuracy and Zero-Drift Performance

– 140-μV Voltage Offset (Max, −40°C to 125°C)

– 0.35% Gain Error (Max, −40°C to 125°C)

• Bandwidth: 1 MHz (For A1, A2, A3, A4 Version)

• Excellent Start-up and Power-off Response

• Gain Options for Voltage Output

– TPA135A1: 20 V/V

– TPA135A2: 50 V/V

– TPA135A3: 100 V/V

– TPA135A4: 200 V/V

– TPA135A5: 500 V/V

• −40°C to 125°C Operation Range

Applications：

• Current Sensing (High-Side and Low-Side)

• Power Management

• Solenoid and Valve Control

• Motor Control