Overview
The NCP1070STCT3G is a high-voltage switcher integrated circuit (IC) produced by onsemi. This component is part of the NCP107x family, which integrates a fixed frequency current mode controller with a 700 V MOSFET. It is designed for low power offline Switch-Mode Power Supplies (SMPS) and is available in a SOT-223 package. The IC offers a high level of integration, including features such as soft-start, frequency-jittering, short-circuit protection, and Dynamic Self-Supply, eliminating the need for an auxiliary winding.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| MOSFET On-State Resistance (RDS(on)) | 22 | Ω |
| Maximum Peak Current (Ipeak) | 250 | mA |
| Oscillation Frequency | 65, 100, 130 | kHz |
| Power Switch Circuit Breakdown Voltage (BVDSS) | 700 | V |
| Supply Voltage Range (VCC) | 6.1 - 8.6 | 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 on-state resistance (RDS(on)) of 22 Ω for the NCP1070/71 models.
- Current-Mode Fixed Frequency Operation: Available frequencies include 65 kHz, 100 kHz, and 130 kHz.
- Peak Current Limitation: Maximum peak current set points vary by model, e.g., 250 mA for NCP1070.
- 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.
- Low Standby Power Consumption: Reduces input power consumption below 50 mW at high line with the connection of an auxiliary winding.
- Large Creepage Distance Between High-Voltage Pins: Enhances safety and reliability.
Applications
The NCP1070STCT3G is suitable for various low power offline SMPS applications, including:
- Power adapters for consumer electronics.
- Small power supplies for industrial and medical devices.
- LED lighting power supplies.
- Low power DC-DC converters.
Q & A
- What is the maximum voltage rating of the MOSFET in the NCP1070STCT3G?
The MOSFET has a maximum voltage rating of 700 V.
- What are the available oscillation frequencies for the NCP1070STCT3G?
The available frequencies are 65 kHz, 100 kHz, and 130 kHz.
- What is the maximum peak current for the NCP1070 model?
The maximum peak current for the NCP1070 model is 250 mA.
- Does the NCP1070STCT3G have built-in short-circuit protection?
- How does the Dynamic Self-Supply feature work?
The Dynamic Self-Supply feature eliminates the need for an auxiliary winding by self-supplying the IC during operation.
- What is the typical standby power consumption of the NCP1070STCT3G?
The standby power consumption can be reduced below 50 mW at high line with the connection of an auxiliary winding.
- What package types are available for the NCP1070STCT3G?
The NCP1070STCT3G is available in a SOT-223 package.
- Does the NCP1070STCT3G support frequency jittering?
- What is the purpose of the soft-start feature in the NCP1070STCT3G?
The soft-start feature ensures a smooth startup and reduces inrush current.
- Can the NCP1070STCT3G be used in high-temperature environments?
