Overview
The NCP1075STCT3G, produced by onsemi, is a high-voltage switcher integrated circuit designed for low power offline Switch-Mode Power Supplies (SMPS). This component is part of the NCP107x family, which integrates a fixed frequency current mode controller with a 700 V MOSFET. It is available in PDIP-7 and SOT-223 packages, offering a high level of integration and various protection features.
The NCP1075STCT3G is known for its efficiency at both nominal and light loads, featuring frequency foldback and skip-cycle modes to reduce standby consumption. It also includes soft-start, frequency-jittering, short-circuit protection, and overvoltage protection with auto-recovery.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| MOSFET On-State Resistance (RDS(on)) | 11 | Ω |
| Peak Current (Ipeak) | 450 | mA |
| Oscillator Frequency | 65, 100, 130 kHz | kHz |
| Power Switch Circuit Breakdown Voltage (BVDSS) | 700 | V |
| VCC On Voltage (VCC(on)) | 7.8 | V |
| VCC Off Voltage (VCC(off)) | 6.1 | V |
| Internal IC Consumption (ICC1) | 0.7 - 1.3 | mA |
| Soft-Start Duration (TSS) | 1 | ms |
| Leading Edge Blanking Duration (TLEB) | 200 | ns |
| Propagation Delay (Tprop) | 100 | ns |
Key Features
- Built-in 700 V MOSFET: With an on-state resistance of 11 Ω for the NCP1075 model.
- Current-Mode Fixed Frequency Operation: Available frequencies include 65 kHz, 100 kHz, and 130 kHz.
- Soft-Start and Frequency-Jittering: Reduces electromagnetic interference (EMI) and ensures smooth startup.
- Short-Circuit Protection and Overvoltage Protection: Includes auto-recovery and AC input line voltage detection.
- Dynamic Self-Supply: Eliminates the need for an auxiliary winding.
- Frequency Foldback and Skip-Cycle Modes: Enhances efficiency at light loads and reduces standby consumption.
- Large Creepage Distance Between High-Voltage Pins: Ensures safety and reliability.
- Ramp Compensation: Built-in slope compensation to prevent sub-harmonic oscillations.
Applications
The NCP1075STCT3G is suitable for various low power offline SMPS applications, including:
- Power adapters for consumer electronics.
- LED drivers and lighting systems.
- Small appliances and white goods.
- Industrial control systems and automation.
- Medical devices requiring high reliability and efficiency.
Q & A
- What is the maximum operating frequency of the NCP1075STCT3G?
The NCP1075STCT3G operates at frequencies of 65 kHz, 100 kHz, and 130 kHz.
- What is the on-state resistance (RDS(on)) of the MOSFET in the NCP1075STCT3G?
The RDS(on) is 11 Ω.
- What protection features are included in the NCP1075STCT3G?
The component includes short-circuit protection, overvoltage protection with auto-recovery, and AC input line voltage detection.
- How does the NCP1075STCT3G manage efficiency at light loads?
The IC enters frequency foldback and skip-cycle modes to reduce standby consumption and enhance efficiency at light loads.
- What is the purpose of the Dynamic Self-Supply feature in the NCP1075STCT3G?
The Dynamic Self-Supply feature eliminates the need for an auxiliary winding, simplifying the circuit design.
- What is the typical soft-start duration for the NCP1075STCT3G?
The soft-start duration is 1 ms.
- What is the leading edge blanking duration for the NCP1075STCT3G?
The leading edge blanking duration is 200 ns.
- What is the propagation delay from current detection to drain OFF state in the NCP1075STCT3G?
The propagation delay is 100 ns.
- What are the typical operating temperatures for the NCP1075STCT3G?
The component operates over a temperature range of -40°C to +125°C.
- What are the package options available for the NCP1075STCT3G?
The component is available in PDIP-7 and SOT-223 packages.
