The CSC7203 is a high-performance, current-mode Pulse Width Modulation (PWM) switching power converter IC designed for off-line power supplies, manufactured by Crystal Source Microelectronics (cschip). It is optimized for low-power, cost-effective applications, meeting green environmental standards with no-load power consumption below 0.3W (0.2W at 220VAC). It is commonly used in economical switching power supplies for devices like set-top boxes, DVD players, printers, LCD displays, and power adapters. Below is a detailed overview based on available information and the provided search results.

Key Specifications

• Type: AC-DC Controller and Regulator (Power Management IC)
• Package: DIP-8 (8-pin Dual Inline Package)
• Input Voltage Range: 85VAC to 265VAC (full range)
• Built-in BJT: 700V high-power Bipolar Junction Transistor (BJT)
• No-Load Power Consumption: <0.3W (general), <0.2W at 220VAC
• Control Mode: Current-mode PWM
• Pin Configuration (DIP-8):
  • Pin 1: NC (No Connect)
  • Pin 2: VCC (Power Supply)
  • Pin 3: GND (Ground)
  • Pin 4: NC
  • Pin 5: FB (Feedback)
  • Pin 6: NC
  • Pin 7: OC (Overcurrent)
  • Pin 8: OC
• Moisture Sensitivity Level (MSL): MSL 3 (requires careful handling during assembly to prevent moisture damage)
• Output Power: Suitable for up to 12W (e.g., 12V/1A adapters)
• Operating Temperature: Typically -40°C to +85°C (verify with datasheet for exact range)

Features

• Low Power Consumption: Meets green standards with minimal standby power.
• Wide Input Range: Supports universal AC input (85–265VAC), ideal for global applications.
• Integrated BJT: Built-in 700V BJT simplifies design and reduces external components.
• Current-Mode PWM Control: Ensures stable and efficient power delivery.
• Built-in Protections:
  • Pulse-by-pulse current limiting
  • Over-temperature protection
  • Over-current protection
  • Over-voltage protection
  • Over-load protection
• Additional Features:
  • Built-in ramp drive circuit for smooth operation
  • Integrated current limit resistor with temperature compensation

Applications

• Consumer Electronics: Power supplies for set-top boxes, DVD players, LCD displays, and printers.
• Chargers and Adapters: Used in mobile phone chargers and 12W adapters (e.g., 12V/1A)
• Other Devices: General-purpose switching power supplies for low-power applications.

Usage Guidelines

• Circuit Design: Ensure proper feedback loop design using the FB pin for stable voltage regulation. Use the OC pins for overcurrent protection.
• Thermal Management: Provide adequate PCB layout for heat dissipation, as the IC includes a high-power BJT.
• Assembly: Due to MSL 3 rating, components may require baking before reflow soldering to prevent moisture-related damage. A PCB assembly fixture is recommended for wave soldering