CS51033 is a switching controller for use in dc-dc converters. It can be used in the buck topology with a minimum number of external components. The CS51033 consists of a 1.0 A power driver for controlling the gate of a discrete P-channel transistor, fixed frequency oscillator, short circuit protection timer, programmable Soft Start, precision reference, fast output voltage monitoring comparator, and output stage driver logic with latch. The high frequency oscillator allows the use of small inductors and output capacitors, minimizing PC board area and systems cost. The programmable Soft Start reduces current surges at start up. The short circuit protection timer significantly reduces the PFET duty cycle to approximately 1/30 of its normal cycle during short circuit conditions. The CS51033 is available in an 8-Lead SO package. Features • 1.0 A Totem Pole Output Driver • High Speed Oscillator (700 kHz max) • No Stability Compensation Required • Lossless Short Circuit Protection • 2.0% Precision Reference • Programmable Soft Start • Wide Ambient Temperature Range: ♦ Industrial Grade: -40°C to 85°C ♦ Commercial Grade: 0°C to 70°C 95 Units/Rail http://onsemi.com
The CS51033 is a switching controller designed for use in DC-to-DC converters, specifically optimized for the buck topology with a minimum number of external components. It integrates a 1.0 A power driver for controlling the gate of a discrete P-channel transistor, along with a fixed frequency oscillator and short circuit protection timer.
Key features include high-speed operation up to 700 kHz, lossless short circuit protection that significantly reduces duty cycle during faults, and programmable soft start to reduce current surges. The device is available in an 8-lead SO package and operates across a wide ambient temperature range for both industrial and commercial grades.
| Peak Output Current | 1.0 A |
|---|---|
| Steady State Output Current | 200 mA |
The high speed oscillator allows for a maximum frequency of 700 kHz.
No, this method of control does not require any loop stability compensation.
The internal reference voltage is 1.25 V, with a precision of 2.0%.