CR6848 is a high-integration, low-power current-mode PWM control chip suitable for offline AC-DC buck topologies for small-power power modules. The chip can change the PWM working frequency by external resistance; under light load and no-load conditions, the chip automatically enters the PFM working mode, which can effectively reduce the standby power consumption of the power module and achieve green energy saving.
The CR6848 is a highly integrated, low‑power current‑mode PWM controller designed for off‑line AC‑DC flyback topologies in small‑power supply modules. It features adjustable PWM frequency via an external resistor, automatic entry into PFM mode under light or no load to reduce standby power, and built‑in synchronous slope compensation and trapezoidal power‑limit circuits for stable operation.
The device includes over‑voltage and over‑current protection, a 16.5 V output voltage clamp, and 2000 V ESD protection. It is offered in lead‑free SOT‑23‑6L and DIP‑8 packages and is suitable for battery chargers, set‑top box power supplies, DVD power supplies, and other sub‑60 W flyback modules. This manual is written in Chinese.
| Supply voltage (VCC) | 12 V ~ 15 V |
|---|---|
| PWM frequency (typical) | 58 kHz |
| Output voltage clamp | 16.5 V |
| Startup current | 20 µA |
| Operating temperature range | -30 °C ~ 105 °C |
| Package types | SOT‑23‑6L, DIP‑8 (lead‑free) |
The PWM frequency is typically around 58 kHz when a 100 kΩ resistor is used.
Under light load or no load, the chip automatically switches to PFM mode, which lowers standby power.