The SD4938 is a high-performance current mode PWM controller IC with integrated 150V MOSFET designed for switch-mode power supplies (SMPS) in Pakistan. Featuring a built-in high-voltage start-up circuit and burst mode operation at light loads, this power management IC delivers efficient AC-DC conversion for chargers, adapters, and low-power switching power supplies. The SD4938 provides excellent line and load regulation with minimal external components for cost-effective SMPS designs.

Key Features

• Integrated 150V high-voltage MOSFET for direct AC line operation in SMPS applications
• Current mode PWM control ensures fast transient response and excellent load regulation
• Built-in high-voltage start-up circuit eliminates need for external start-up resistor
• Burst mode operation at light loads improves efficiency and reduces standby power consumption
• Comprehensive protection features: over-voltage, over-current, over-temperature, and short-circuit protection
• Wide input voltage range suitable for universal AC input (85-265V AC) applications
• SOP-8 package for compact PCB layout and easy assembly in Pakistan

Applications & Use Cases

• Mobile phone chargers and USB power adapters for smartphones and tablets
• Low-power AC-DC switching power supplies up to 15W output
• LED driver power supplies for lighting applications in Pakistan
• Set-top boxes, routers, and consumer electronics power supplies
• Home appliance auxiliary power supplies and standby power circuits
• Battery chargers for cordless tools and portable devices
• Industrial control and automation low-power supplies

Technical Specifications

• Part Number: SD4938
• Type: Current Mode PWM Controller with Integrated MOSFET
• MOSFET Voltage Rating: 150V
• Control Mode: Current mode PWM (Pulse Width Modulation)
• Input Voltage Range: 85-265V AC (universal input)
• Start-up Circuit: Integrated high-voltage start-up
• Operating Mode: Burst mode at light load for high efficiency
• Switching Frequency: Typically 65kHz (varies with design)
• Protection: OVP, OCP, OTP, short-circuit protection
• Package: SOP-8 (Small Outline Package, 8 pins)
• Operating Temperature: -40°C to +125°C
• Typical Application: 5V-12V output, up to 15W SMPS
• Weight: Approx. 0.5g

Why Buy from Digilog.pk?

We provide authentic SD4938 PWM controller ICs and power management components in Pakistan at competitive prices. Fast delivery to Lahore, Karachi, Islamabad, Rawalpindi, Faisalabad, Multan, and across Pakistan with technical support for your SMPS and power supply design projects.