The SG3525AP013TR is a part of the SG3525 series from STMicroelectronics. It is a pulse-width modulation (PWM) controller integrated circuit typically used in power supply applications, such as DC-DC converters and switch-mode power supplies (SMPS).
Package Type:
The SG3525AP013TR typically comes in a DIP-16 package (Dual In-line Package with 16 pins). However, there may be variations in packaging depending on the specific manufacturer or version of the part.
Pin Function Specifications:
Pin # Pin Name Function Description 1 Vcc Positive power supply voltage (typically +15V) to the IC. 2 Vref Voltage reference output. Provides a stable reference voltage for external components. 3 Feedback Non-inverting input for the feedback signal (often used in a voltage feedback loop). 4 Control Control pin for the operation of the oscillator (connected to external components to adjust the frequency). 5 RT (Resistor) External timing resistor for frequency control. 6 CT ( capacitor ) External timing capacitor for frequency control. 7 Ground Ground pin (GND) for the IC. 8 Output 1 PWM output 1. This is the first output driver signal for controlling external transistor s or MOSFETs . 9 Output 2 PWM output 2. This is the second output driver signal for controlling external transistors or MOSFETs. 10 Deadtime Deadtime control input. This pin allows adjustment of the deadtime between the switching of the two outputs. 11 Oscillator Oscillator control pin. Adjusts the frequency of the internal oscillator circuit. 12 Soft Start Input for external soft-start capacitor to limit the inrush current at startup. 13 Current Sense Input for current sensing for feedback regulation in the power circuit. 14 Shutdown External shutdown pin. When pulled low, it disables the outputs. 15 Pulse-by-Pulse Pulse-by-pulse current limiting control. This pin is used for overcurrent protection. 16 Ground Ground pin (GND). This pin connects to the common ground of the power system.FAQ Section:
Q1: What is the main application of the SG3525AP013TR? A1: The SG3525AP013TR is typically used in power supply circuits, such as DC-DC converters and switch-mode power supplies (SMPS), due to its PWM capabilities.
Q2: What is the voltage supply requirement for the SG3525AP013TR? A2: The SG3525AP013TR typically operates with a supply voltage of around 15V, applied to the Vcc pin (Pin 1).
Q3: How do I adjust the frequency of the SG3525AP013TR? A3: The frequency of the SG3525AP013TR is controlled by the external timing components connected to pins 5 (RT) and 6 (CT). A timing resistor and capacitor set the oscillation frequency.
Q4: Can the SG3525AP013TR be used for high-power applications? A4: Yes, the SG3525AP013TR is often used in high-power applications, but the external power transistors or MOSFETs connected to its output pins must be selected based on the power requirements.
Q5: What is the function of the Vref pin? A5: The Vref pin (Pin 2) outputs a stable reference voltage (typically 5V) for use by external circuits, such as feedback and regulation systems.
Q6: How does the SG3525AP013TR provide overcurrent protection? A6: Overcurrent protection is managed through the Pulse-by-Pulse pin (Pin 15), which monitors the current and can limit the pulse width to protect the system from excessive current.
Q7: Can I use the SG3525AP013TR for both step-up and step-down converters? A7: Yes, the SG3525AP013TR can be used for both step-up (boost) and step-down (buck) converters, depending on the external power components and configuration of the circuit.
Q8: What happens if I connect the Shutdown pin to ground? A8: If the Shutdown pin (Pin 14) is pulled low, it disables the PWM outputs, effectively turning off the power supply operation.
Q9: What is the role of the Deadtime pin? A9: The Deadtime pin (Pin 10) controls the timing between the switching of the two outputs to avoid simultaneous conduction of the external MOSFETs, which would cause short-circuiting and damage.
Q10: How does the SG3525AP013TR handle feedback regulation? A10: Feedback regulation is managed through the Feedback pin (Pin 3), where the system feedback is compared with the reference voltage to adjust the output duty cycle accordingly.
Q11: How do I implement a soft start in my circuit using the SG3525AP013TR? A11: To implement soft-start, you connect an external capacitor to the Soft Start pin (Pin 12), which gradually ramps up the output voltage, preventing inrush currents during startup.
Q12: Can I use the SG3525AP013TR without a current sense input? A12: While the Current Sense pin (Pin 13) is useful for regulation and overcurrent protection, the IC can operate without it if the application does not require current sensing.
Q13: Is the SG3525AP013TR capable of operating in a high-temperature environment? A13: The SG3525AP013TR can operate in a range of temperatures, typically from -40°C to 105°C, depending on the exact package and specifications.
Q14: How do I ensure the SG3525AP013TR stays in a stable oscillation mode? A14: Stable oscillation is ensured by selecting the correct values for the timing components connected to the RT (Pin 5) and CT (Pin 6) pins, along with the proper grounding of the IC.
Q15: Can I use the SG3525AP013TR for high-frequency applications? A15: Yes, the SG3525AP013TR can be used for high-frequency applications, but the external components such as the timing resistor and capacitor need to be selected for high-frequency operation.
Q16: What is the maximum output current that can be sourced or sunk by the SG3525AP013TR? A16: The SG3525AP013TR’s output pins (Pin 8 and Pin 9) can source or sink up to 200mA of current to drive the external MOSFETs or transistors in the power supply circuit.
Q17: Can I directly drive a MOSFET with the output pins of the SG3525AP013TR? A17: Yes, the output pins (Pin 8 and Pin 9) can directly drive MOSFETs in many cases, but ensure that the MOSFET gate capacitance and switching speed are compatible with the IC's capabilities.
Q18: What is the typical application of the SG3525AP013TR in power electronics? A18: The SG3525AP013TR is used in power electronics for controlling DC-DC converters, buck converters, boost converters, and other switch-mode power supplies.
Q19: What is the significance of the Control pin in the SG3525AP013TR? A19: The Control pin (Pin 4) is used to externally adjust the operation of the oscillator circuit. By varying the control voltage, the timing and frequency of the PWM can be modified.
Q20: How do I connect the ground of the SG3525AP013TR to my power supply? A20: The Ground pin (Pin 7) should be connected to the common ground of the power supply system, ensuring that the IC has a consistent reference voltage for all other pins.
This detailed guide provides a comprehensive overview of the SG3525AP013TR’s pin functions and circuit principles, as well as common questions for its application in various power supply systems. Let me know if you need further clarification on any specific pin or application!