CR6848T Controller Chip IC DIP-8 Code: 63119948

The CR6848T (by Chip-Rail) is a highly integrated, low-cost current-mode PWM controller chip designed for offline AC-DC flyback converters, commonly used in under-60W power supplies, battery chargers, and AC/DC adapters.

Key Technical Specifications

• Package:DIP-8 (commonly designated with the ‘T’ suffix) or SOT-23-6.
• Start-Up Current:Ultra-low (typically < 10 μ A) to reduce power consumption.
• Operating Frequency:Programmable (48 kHz to 100 kHz) via an external resistor connected to the RI pin.
• Green Mode:Automatically switches to Pulse Frequency Modulation (PFM) under light or no-load conditions to ensure high efficiency and prevent acoustic noise.
• Protections:Includes Under-Voltage Lockout (UVLO) with a 16.1V turn-on and 11.1V turn-off threshold, built-in 27V over-voltage protection, and Leading-Edge Blanking (LEB).

Pin Configuration (DIP-8 Package)

1. GATE:Drives the external MOSFET.
2. VDD:Positive supply voltage for the IC.
3. NC:No connection.
4. CS/SEN:Current Sense pin.
5. RI:Frequency control pin (connects to ground via resistor).
6. NC:No connection.
7. FB:Voltage Feedback pin.
8. GND:Ground / Negative supply.