The SG6840 provides special enhancements that satisfy the increased need for low-standby power compatible controllers with stronger protection functions. In standby mode, the PWM frequency is linearly reduced to cut power consumption, while supplying a stable output voltage. The BiCMOS process enables the start-up current to be reduced to 30uA, and the operation current to be reduced to 3mA.
The SG6840's PWM frequency can be configured by changing an external resistor. During normal operation, it acts as a fixed frequency PWM controller. Under reduced load conditions, its patented green-mode function will decrease the PWM frequency and thus dramatically reduces power usage under zero-load and light-load conditions.
Proprietary Synchronized Slope Compensation ensures the stability of the current loop under continuous-mode operation. Built in line-voltage compensation maintains a constant output power limit for a wide AC-input range. An NTC thermistor provides Over Temperature Protection by sensing the ambient temperature.
Features:
- Green-mode PWM supports the "Blue Angel" standard.
- Low start up current of 30uA; low operating current of 3mA.
- Leading-edge blanking.
- Built-in synchronized slope compensation.
- Totem pole output w/ soft driving for better EMI.
- Constant output power limit.
- Cycle-by-cycle current limiting.
- Under Voltage Lockout (UVLO).
- Programmable PWM frequency.
- GATE output maximum voltage clamped at 18V.
- Short circuit protection.
- Programmable Over Temperature Protection.
- A low cost solution requiring few external components.
Others:
| Part No. | Pin Configuration | Package Type |
|---|---|---|
| SG6840D | 8 Pin | DIP Plastic |
| SG6840S | 8 Pin | SOP Plastic |
Ordering information:
- Minimum Order: Negotiable
- FOB: TBD