Key facts
- Brand
- STMicroelectronics
- Model
- L5991
- Industry
- Industrial
- Documents
- 7
- Languages
- EN
- Last added
- 2012-08-10
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STMicroelectronics L5991/L5991A Primary Controller Datasheet
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.
Read onlineSTMicroelectronics L5991 specifications
| 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 |
Source: STMicroelectronics L5991/L5991A Primary Controller Datasheet
All STMicroelectronics L5991 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
How to use the product for one specific task, with worked examples.
- STMicroelectronics AN1686 Application Note: L5991-Based Converter with Temporary Extra Power Capability 7 p
- STMicroelectronics AN1537 L5991 Application Note 18 p
- STMicroelectronics AN1215 Application Note 7 p
- STMicroelectronics L5991 Application Note AN1049 Minimize Power Losses of Lightly Loaded Flyback Converters 24 p
Questions answered in these manuals
What is the maximum switching frequency of the L5991?
The maximum switching frequency is up to 1MHz.
From: STMicroelectronics L5991/L5991A Primary Controller Datasheet
What is the start-up current of the device?
The start-up current is less than 120 µA.
From: STMicroelectronics L5991/L5991A Primary Controller Datasheet
What is the input voltage range for this demonstration board?
The board accepts an AC input voltage between 88 and 300 Vac at a frequency of 50-60 Hz.
What are the output voltages and currents for this power supply?
The unit provides three outputs: 13.8 V at 3 A, 25 V at 200 mA, and 3.8 V at 350 mA.
What components does the STEVAL-ISA032V1 board use?
The board is based on the primary controller L5991 and the STP10NK60Z N-channel 600 V power MOSFET.
What is the intended application for this demonstration board?
It is designed to supply power to the electronic fiscal cash register (EFCR) demonstration board STEVAL-IPCO01V1.