CHL8325A-08CRT

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The CHL8325A-08CRT is an ideal DC-DC switching controller for implementing low cost, synchronous Buck switching voltage regulators with exceptionally fast transient response and low noise. This DC-DC switching controller is suitable for implementation in both single-rail and multi-rail voltage regulation systems where fast transient response and low noise performance is essential. This controller is also useful for implementing high current, low voltage switching power supplies.The main features of the CHL8325A-08CRT include a pulse-width modulated (PWM) control scheme with low-side current sensing and an adjustable switching frequency between 150 kHz and 500 kHz. This controller also has synchronous rectification control with a locked-antiphase mode that reduces switching losses and EMI. Additionally, the CHL8325A-08CRT has an adjustable dead-time control that modifies the delay between the low- and high-side switching pulses.The CHL8325A-08CRT is ideal for implementing a wide range of DC-DC applications such as telecom, industrial, automotive, and consumer systems. This controller is especially suitable for applications with high power density, high current, and high voltage requirements. The operating principle of the CHL8325A-08CRT is based on a fixed off-time PWM control scheme combined with a low-side current sense. The fixed off-time PWM provides a constant switching latency for a given load current and input voltage and thus helps reduce output noise and ringing. The low-side current sense allows for accurate current regulation, providing fast loop response, high efficiency, and low noise operation. The main components of the CHL8325A-08CRT include a MOSFET driver, an oscillator, a voltage reference, a low-side current sense, a transconductance error amplifier, a soft start circuit, a PWM comparator, and a dead-time control circuit. The MOSFET driver is used to drive the high and low side MOSFETs of the switching stage. The oscillator is used to generate the switching frequency, which can be adjusted between 150 kHz and 500 kHz. The voltage reference is used to sense the output voltage. The low-side current sense is used to sense the inductor current and thus provide closed loop current regulation. The transconductance amplifier amplifies the difference between the reference voltage and the sensed output voltage to generate the current error signal. The soft start circuit is used to slowly charge the output capacitors before switching starts and thus prevent output overshoots. The PWM comparator is used to compare the current error signal with the saw tooth oscillator signal to generate the PWM signal for the MOSFET driver. Finally, the dead-time control circuit is used to adjust the delay between the high- and low-side switching pulses. This delay helps to prevent shoot-through current and improve efficiency.

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