Overview
The NCP1075STAT3G is a high-voltage switcher integrated circuit (IC) designed by onsemi for use in low power offline Switch-Mode Power Supplies (SMPS). This IC is part of the NCP107x family, which integrates a fixed frequency current mode controller with a 700 V MOSFET. It is available in a SOT-223 package, offering a high level of integration and various protection features. The NCP1075STAT3G is known for its efficiency, especially at light loads, and its ability to operate quietly by entering frequency foldback and skip modes when the output power demand diminishes.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| MOSFET On-State Resistance (RDS(on)) | 11 | Ω |
| Peak Current (Ipeak) | 450 | mA |
| Oscillation Frequency (fOSC) | 65 kHz (typical) | kHz |
| Maximum Duty Cycle (Dmax) | 62-68% | % |
| Power Switch Circuit Breakdown Voltage (BVDSS) | 700 | V |
| Soft-Start Duration (TSS) | 1 ms | ms |
| Leading Edge Blanking Duration (TLEB) | 200 ns | ns |
| Propagation Delay (Tprop) | 100 ns | ns |
| Package Type | SOT-223 | - |
Key Features
- Built-in 700 V MOSFET with RDS(on) of 11 Ω.
- Current-mode fixed frequency operation at 65 kHz, 100 kHz, or 130 kHz.
- Soft-start, frequency-jittering, and skip-cycle modes for improved efficiency at light loads.
- Dynamic Self-Supply (DSS) eliminating the need for an auxiliary winding.
- Protection features include overvoltage protection with auto-recovery, short-circuit protection, and AC input line voltage detection.
- Large creepage distance between high-voltage pins.
- Fixed ramp compensation to prevent sub-harmonic oscillations.
Applications
The NCP1075STAT3G is suitable for various low power offline SMPS applications, including:
- Power adapters for consumer electronics.
- Chargers for portable devices.
- Small power supplies for industrial and medical devices.
- LED drivers and lighting systems.
Q & A
- What is the typical oscillation frequency of the NCP1075STAT3G?
The typical oscillation frequency is 65 kHz, but it can also operate at 100 kHz or 130 kHz depending on the configuration.
- What is the peak current limit of the NCP1075STAT3G?
The peak current limit is 450 mA.
- What type of package is the NCP1075STAT3G available in?
The NCP1075STAT3G is available in a SOT-223 package.
- Does the NCP1075STAT3G have built-in protection features?
- How does the NCP1075STAT3G manage power consumption at light loads?
The IC enters frequency foldback and skip modes to reduce standby consumption at light loads.
- What is the maximum duty cycle of the NCP1075STAT3G?
The maximum duty cycle is between 62% and 68%.
- Does the NCP1075STAT3G require an auxiliary winding for operation?
No, it features a Dynamic Self-Supply (DSS) that eliminates the need for an auxiliary winding.
- What is the breakdown voltage of the power switch circuit?
The breakdown voltage (BVDSS) is 700 V.
- How long is the soft-start duration of the NCP1075STAT3G?
The soft-start duration (TSS) is 1 ms.
- What is the propagation delay from current detection to drain OFF state?
The propagation delay (Tprop) is 100 ns.
