Analog Devices Inc. AD8452 PWM Controllers
Analog Devices Inc. AD8452 PWM Controllers combine a precision analog front-end controller and switch mode power supply (SMPS), pulse-width modulator (PWM) driver into a single silicon platform for high volume battery testing and formation manufacturing. A precision instrumentation amplifier (in-amp) measures the battery charge / discharge current to >±0.1% accuracy, while an equally accurate difference amplifier measures the battery voltage. Internal laser-trimmed resistor networks establish the in-amp and difference amplifier gains (66V/V and 0.4V/V, respectively) and stabilize the ADI AD8452 performance across the rated operating temperature range.
Features
- CC and CV battery test and formation modes with transparent and automatic switchover, for systems of 20Ah or less
- Precise measurement of voltage and current
- Independent feedback control blocks
- Highly accurate, factory-trimmed instrumentation and differential amplifiers
- Stable over temperature: <0.6μV/°C maximum offset voltage drift
- <3ppm/°C maximum gain drift
- 66V/V in-amp for current sense gain
- 0.4V/V difference amplifier for voltage sense gain
- 120dB minimum current sense CMRR
- Popular SMPS control for charge/discharge
- High PWM linearity with internal ramp voltage
- 50kHz to 300kHz user-controlled switching frequency
- Synchronization output or input with adjustable phase shift
- Programmable soft start
Development Tool
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