SG3525ANG

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The SG3525AN is a voltage-mode pulse-width-modulation (PWM) controller that can generate a periodic pulse-width-modulated (PWM) waveform for controlling power devices that require current or voltage regulation. This integrated circuit (IC) also includes an on-chip logic chip with a programmable clock frequency, responsive under-voltage lockout protection and active-high on-chip logic enable. The SG3525AN is widely used in the fields of current and voltage regulation, changeover switches and overcurrent protection.

The SG3525AN has four operating modes: PFM mode, PWM mode, PULSED mode and BURST mode. In PFM mode, the IC has a constant switching frequency, low input current and fast response time. In PWM mode, the frequency can be adjusted and the power supply accuracy of the IC can be increased. In PULSED mode, the frequency is fixed and the output voltage is approximately proportional to the input voltage. In BURST mode, the interior clock frequency of the IC is adjustable, the current at low output IS adjustable and the dynamic response time is improved.

The application areas of the SG3525AN are very widespread, including the speed control of electric vehicles, DC-DC boost and buck power module design, switching power supply and LED constant current driver, solar system controllers, LED lighting, and more. At the same time, the voltage regulator IC, SG3525AN, is widely used in military, aerospace, communication and industrial fields, including telecommunication base station, wireless devices, intelligent control, etc.

The SG3525AN includes two independent error amplifiers, each connected to one of the two analog input pins (Vref1 and Vref2). The Vref1 pin is used to set the operating voltage of the switching devices such as an NPN power transistor,andthe Vref2 pin is used to set the operating voltage of the P-channel power MOSFET. The output current of the error amplifiers is controlled by a single external resistor, allowing the user to set the reference voltage over a wide range.

The main oscillator of the SG3525AN is internally generated by multiplying the externally programmed clock frequency, which is typically 10kHz to 200kHz and can be adjusted by an external capacitor and resistor. The circuit can be synchronized by an external signal. The contents of the logic control latch are set and reset by this external signal, which is latched into the logic circuit during the rising edge of the clock.

The SG3525AN provides a microcontroller interface compatible with the logic control latch. The microcontroller reads the logic data by activating the processor interface (PE) pin. The logic control latch is reset through the reset pin, which prevents the control bits from changing randomly. The control latch data consists of the PWM or PFM selection, the UVLO state and the current-sense condition.

In summary, the SG3525AN is an efficient and cost-effective solution for current and voltage regulation, changeover switches and overcurrent protection. Its application areas are very extensive, including precision speed control of electric vehicles, DC-DC boost and buck power modules, switching power supplies, LED lighting, solar controllers, and many more. The SG3525AN includes two independent error amplifiers and a microcontroller compatible interface. Its main oscillator can be synchronized by an external signal, and the logic control data consists of the mode selection, UVLO state and current-sense condition.

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