CS3845
features to implement off- line fixed frequency current- mode control with a minimum number of external ponents.
The CS3844 family incorporates a new precision temperature- controlled oscillator to minimize variations in frequency. An internal toggle flip- flop, which blanks the output every other clock cycle, limits the duty- cycle range to less than 50%. An undervoltage lockout ensures that VREF is stabilized before the output stage is enabled. In the CS2844/CS3844 turn on occurs at 16 V and turn off at 10 V. In the CS2845/CS3845 turn on is at 8.4 V and turn off at 7.6 V.
Other features include low start- up current, pulse- by- pulse current limiting, and a high- current totem pole output for driving capacitive loads, such as gate of a power MOSFET. The output is low in the off state, consistent with N- channel devices.
Features
- Optimized for Off- Line Control
- Temp. pensated Oscillator
- 50% Max Duty- Cycle Clamp
- VREF Stabilized Before Output Stage Is Enabled
- Low Start- Up Current
-...
