Overview
The NCP1077STBT3G is a high-voltage switcher integrated circuit (IC) produced by onsemi. It is part of the NCP107x family, which integrates a fixed frequency current mode controller with a 700 V MOSFET. This IC is designed for low power offline Switch-Mode Power Supplies (SMPS) and is available in PDIP-7 or SOT-223 packages. The NCP1077STBT3G 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)) | 4.7 | Ω |
| Peak Current (Ipeak) | 800 | mA |
| Oscillation Frequency | 65, 100, 130 | kHz |
| Startup 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) | 1.0 | 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 (RDS(on)) of 4.7 Ω.
- 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 improves reliability.
- Short-Circuit Protection and Skip-Cycle: Enhances safety and efficiency during light load conditions.
- Dynamic Self-Supply: Eliminates the need for an auxiliary winding.
- Overvoltage Protection with Auto-Recovery: Protects against voltage surges and automatically recovers.
- AC Input Line Voltage Detection: Monitors and adjusts based on input voltage changes.
- Low Standby Power Consumption: Reduces input power consumption below 50 mW at high line.
Applications
- Low Power Offline SMPS: Suitable for various low power offline switch-mode power supply applications.
- Consumer Electronics: Used in power supplies for consumer electronics such as chargers, adapters, and small appliances.
- Industrial Power Supplies: Applicable in industrial settings where reliable and efficient power conversion is required.
- Medical Devices: Can be used in medical devices that require high reliability and low noise power supplies.
Q & A
- What is the maximum voltage rating of the MOSFET in the NCP1077STBT3G?
The maximum voltage rating of the MOSFET is 700 V.
- What are the available oscillation frequencies for the NCP1077STBT3G?
The available frequencies are 65 kHz, 100 kHz, and 130 kHz.
- What is the peak current limit for the NCP1077STBT3G?
The peak current limit is 800 mA.
- Does the NCP1077STBT3G have built-in overvoltage protection?
Yes, it has overvoltage protection with auto-recovery.
- How does the NCP1077STBT3G manage standby power consumption?
It reduces input power consumption below 50 mW at high line by stopping the Dynamic Self-Supply operation when an auxiliary winding is connected.
- What is the purpose of the soft-start feature in the NCP1077STBT3G?
The soft-start feature reduces electromagnetic interference (EMI) and improves reliability during startup.
- Can the NCP1077STBT3G operate in skip-cycle mode?
Yes, it enters skip-cycle mode to reduce standby consumption during light load conditions.
- What is the typical VCC on voltage for the NCP1077STBT3G?
The typical VCC on voltage is 7.8 V.
- What is the leading edge blanking duration for the NCP1077STBT3G?
The leading edge blanking duration is 200 ns.
- Is the NCP1077STBT3G suitable for industrial power supplies?
Yes, it is suitable for industrial settings where reliable and efficient power conversion is required.
