TEXAS INSTRUMENTS LM27403EVM. 评估板, LM27403 直流/直流转换器
The is an evaluation module for the evaluation of LM27403 DC to DC regulator. The LM27403 is a feature rich, easy to use, synchronous buck controller offering exceptional levels of integration and performance for superior efficiency in high power density, point of load POL DC to DC regulator solutions. The LM27403 has a conventional voltage mode control loop with high gain bandwidth error amplifier and PWM input voltage feedforward. The LM27403EVM is designed to use a regulated or non regulated input bus 3V to 20V to produce a tightly regulated output of 1.2V at up to 25A of load current. The evaluation module is designed to operate from a single supply rail, no additional bias voltage is required. The evaluation module output voltage has better than 1% setpoint accuracy and is adjustable between 0.6V and 5.5V simply by changing the lower feedback resistance. Nominal input voltage is 12V but can vary from 3V to 20V with suitable adjustment of the programmable UVLO.
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- Nominal output voltage of 1.2V with 1% feedback accuracy
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- High efficiency at full load, 91% at 1.2V, 25A
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- Wide input voltage operating range of 3V to 20V
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- 250KHz switching frequency
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- Over current protection via inductor DCR current sensing with thermal compensation
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- Programmable thermal shutdown based on remote sensed temperature
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- Soft start time of 8ms
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- Monotonic prebias output voltage startup
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- Programmable input UVLO set to turn on and off at 6.5V and 5.2V, respectively
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- Output voltage adjustable from 0.6V to 5.5V by changing lower feedback resistance
ESD sensitive device, take proper precaution while handling the device.
Exercise care when touching the evaluation module while the fan is not running. Always exercise caution when touching any circuits that may be live or energized.