L5991 L5991A is a primary controller with standby current-mode control PWM switching frequency up to 1MHz, low start-up current (<120µA), high-current output drive suitable for power MOSFET (1A), fully latched PWM logic with double pulse suppression, programmable duty cycle 100% and 50%, maximum duty cycle limit, standby function, programmable soft start, primary overcurrent fault detection with re-start delay, PWM UVLO with hysteresis, internal 100ns leading edge blanking of current sense, DIP16 and SO16 package.
The L5991 and L5991A are primary controllers developed in BCD600II technology designed for off-line or DC-DC power supply applications. These devices utilize fixed frequency current mode control and include features such as programmable soft start, IN/OUT synchronization, precise maximum duty cycle control, and a standby function for oscillator frequency reduction under light loads. The chips are available in DIP16 and SO16 packages.
| Switching Frequency | Up to 1MHz |
|---|---|
| Start-up Current | < 120 µA |
| Output Drive Current | 1A |
| Maximum Duty Cycle | 100% and 50% |
| Leading Edge Blanking | 100ns |
| Package Types | DIP16 and SO16 |
| Reference Voltage | 5.0V +/-1.5% |
| Operating Temperature Range | -40 to 150 °C |
The maximum switching frequency is up to 1MHz.
The start-up current is less than 120 µA.
The device is available in DIP16 and SO16 packages.