Overview
The SG3524P, produced by STMicroelectronics, is a versatile and integrated pulse-width modulation (PWM) controller designed for a wide range of power supply and switching regulator applications. This device incorporates all the necessary functions for constructing regulating power supplies, inverters, or switching regulators on a single monolithic chip. It is suitable for high-power-output applications, including switching regulators of either polarity, transformer-coupled DC-DC converters, transformerless voltage doublers, and polarity converter applications using fixed-frequency PWM techniques.
Key Specifications
| Parameter | Min | Typical | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VIN) | 8 | - | 40 | V |
| Collector Output Current (IC) | - | - | 100 | mA |
| Reference Output Voltage (VREF) | 4.6 | 5 | 5.4 | V |
| Line Regulation (∆VREF) | 10 | 20 | 30 | mV |
| Load Regulation (∆VREF) | 20 | 50 | 50 | mV |
| Ripple Rejection | 66 | - | - | dB |
| Operating Frequency (fMAX) | - | - | 300 | kHz |
| Operating Temperature Range | 0 | - | 70 | °C |
| Standby Current (Iq) | 8 | 10 | - | mA |
Key Features
- Complete PWM Power Control Circuitry: Includes all necessary functions for PWM control on a single chip.
- Low Standby Current: Typical standby current of 8 mA.
- Uncommitted Outputs: Suitable for single-ended or push-pull applications.
- Precision Reference Voltage: 1% maximum temperature variation of reference voltage.
- Programmable Oscillator: Operates up to 300 kHz with programmable frequency using RT and CT components.
- Current Limiting and Shutdown Circuitry: Includes high-gain comparator and current-limiting features.
Applications
- Switching Regulators: Suitable for regulators of either polarity.
- Transformer-Coupled DC-DC Converters: Ideal for transformer-coupled DC-DC conversion applications.
- Transformerless Voltage Doublers: Can be used in transformerless voltage doubler configurations.
- Polarity Converter Applications: Useful in polarity converter applications employing fixed-frequency PWM techniques.
- High-Power Output Applications: Can serve as the control element for high-power output applications.
Q & A
- What is the SG3524P used for?
The SG3524P is used for constructing regulating power supplies, inverters, or switching regulators. It is also suitable for high-power output applications.
- What is the operating voltage range of the SG3524P?
The operating voltage range is from 8 V to 40 V.
- What is the maximum operating frequency of the SG3524P?
The maximum operating frequency is up to 300 kHz.
- What type of outputs does the SG3524P have?
The SG3524P has uncommitted outputs suitable for single-ended or push-pull applications.
- What is the typical standby current of the SG3524P?
The typical standby current is 8 mA.
- What is the temperature variation of the reference voltage?
The reference voltage has a maximum temperature variation of 1%.
- What are the key components included in the SG3524P?
The device includes an on-chip reference, error amplifier, programmable oscillator, pulse-steering flip-flop, two uncommitted output transistors, a high-gain comparator, and current-limiting and shutdown circuitry.
- What is the operating temperature range of the SG3524P?
The operating temperature range is from 0°C to 70°C.
- How is the frequency of the SG3524P programmed?
The frequency is programmed using one timing resistor (RT) and one timing capacitor (CT).
- What is the ripple rejection of the SG3524P?
The ripple rejection is 66 dB at 120 Hz.
