Overview
The NCP1054ST100T3G, produced by onsemi, is a highly integrated power management IC designed for high-voltage flyback converters. This device is part of the NCP105X series, which combines active power, control logic, and protection circuitry on a single monolithic chip. It is optimized for direct operation from a rectified 240 VAC line source and is suitable for applications requiring minimal external components and very low standby power consumption.
Key Specifications
| Characteristics | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Drain Voltage Range | VDS | 0 | - | 700 | V |
| Drain Current Peak During Transformer Saturation | IDS(pk) | - | - | 2.0 x Ilim Max | A |
| Power Switch Circuit On-State Resistance (TJ = 25°C, ID = 100 mA) | RDS(on) | - | - | 22 | Ω |
| Oscillator Frequency (VCC = 7.5 V, TJ = 25°C, 100 kHz Version) | fOSC | 87 | - | 107 | kHz |
| Maximum Duty Cycle | D(max) | 74 | - | 80 | % |
| Current Limit Threshold (TJ = 25°C) | Ilim | 372 | - | 428 | mA |
| Thermal Shutdown (Junction Temperature Increasing) | Tsd | 140 | - | 160 | °C |
| Startup Threshold/VCC Regulation Peak (VCC Increasing) | VCC(on) | 7.5 | - | 8.5 | V |
Key Features
- Startup Circuit Eliminates the Need for Transformer Auxiliary Bias Winding
- Optional Auxiliary Bias Winding Override for Lowest Standby Power Applications
- Converter Output Overload and Open Loop Protection
- Auto Restart Fault Protection
- IC Thermal Fault Protection
- Unique, Dual Edge, Gated Oscillator Configuration for Extremely Fast Loop Response
- Oscillator Frequency Dithering with Controlled Slew Rate Driver for Reduced EMI
- Low Power Consumption Allowing European Blue Angel Compliance
- On-Chip 700 V Power Switch Circuit and Active Startup Circuit
- Rectified AC Line Source Operation from 85 V to 265 V
- Input Undervoltage Lockout with Hysteresis
- Oscillator Frequency Options of 44 kHz, 100 kHz, 136 kHz
Applications
- Cellular Phone Chargers
- Standby Power Supplies for Personal Computers
- Secondary Bias Supplies for Microprocessor Keep-Alive Supplies
- IR Detector Supplies
Q & A
- What is the NCP1054ST100T3G used for?
The NCP1054ST100T3G is used for high-voltage flyback converters, particularly in applications requiring minimal external components and low standby power consumption.
- What are the key features of the NCP1054ST100T3G?
Key features include a startup circuit that eliminates the need for a transformer auxiliary bias winding, auto restart fault protection, IC thermal fault protection, and oscillator frequency dithering for reduced EMI.
- What are the oscillator frequency options for the NCP1054ST100T3G?
The oscillator frequency options are 44 kHz, 100 kHz, and 136 kHz.
- What is the maximum drain voltage for the NCP1054ST100T3G?
The maximum drain voltage is 700 V.
- What is the current limit threshold for the NCP1054ST100T3G at 25°C?
The current limit threshold is between 372 mA and 428 mA.
- What is the thermal shutdown temperature for the NCP1054ST100T3G?
The thermal shutdown temperature is between 140°C and 160°C.
- What are the typical applications of the NCP1054ST100T3G?
Typical applications include cellular phone chargers, standby power supplies for personal computers, and secondary bias supplies for microprocessor keep-alive supplies.
- Does the NCP1054ST100T3G support European Blue Angel compliance?
Yes, it supports European Blue Angel compliance due to its low power consumption.
- What is the input undervoltage lockout threshold voltage for the NCP1054ST100T3G?
The input undervoltage lockout threshold voltage ranges from 4.0 V to 5.0 V.
- Is the NCP1054ST100T3G Pb-Free and Halide-Free?
Yes, the NCP1054ST100T3G is Pb-Free and Halide-Free.
