NCP1308 PWM Current-Mode Controller for Free-Running Quasi-Resonant Operation
The NCP1308 is a PWM current-mode controller designed for free-running quasi-resonant operation in any load or line conditions. It combines a true current mode modulator with a demagnetization detector to ensure full borderline/critical conduction mode and minimum drain voltage switching. The device features dynamic self-supply (DSS) which simplifies transformer design by eliminating the need for an auxiliary winding, making it suitable for applications like battery chargers where output voltage varies.
| Power Supply Voltage (Voc, Drv) | 20 V |
|---|---|
| Maximum Junction Temperature | 150 °C |
| Temperature Shutdown | 155 °C |
| Internal Soft-Start Time | 1.0 ms |
| Overvoltage Protection Latchoff Level (Voc) | 16 V typical |
It is a PWM current-mode controller for free-running quasi-resonant operation.
No, its Dynamic Self-Supply feature avoids the use of an auxiliary winding.
The internal soft-start time is 1.0 ms.