Overview
The NCP1053ST136T3G, 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 offers a comprehensive solution for modern consumer electronic power supplies. It integrates all the necessary active power, control, logic, and protection circuitry on a single monolithic chip, ensuring compliance with very low standby power requirements.
The NCP1053ST136T3G operates directly from a rectified 240 VAC line source and requires minimal external components, making it a cost-effective solution. It features an active startup regulator circuit, fault logic with a programmable timer, and a unique gated oscillator configuration for fast loop response and reduced EMI.
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 |
| Oscillator Frequency (VCC = 7.5 V, TJ = 25°C) | fOSC(low) | 113 | 132 | 145 | kHz |
| Maximum Duty Cycle | D(max) | 74 | 77 | 80 | % |
| Power Switch Circuit On-State Resistance (TJ = 25°C) | RDS(on) | 22 | 30 | 42 | Ω |
| Current Limit Threshold (TJ = 25°C) | Ilim | 372 | 428 | 567 | mA |
| Thermal Shutdown (Junction Temperature Increasing) | Tsd | 140 | - | 160 | °C |
| Startup Threshold/VCC Regulation Peak (VCC Increasing) | VCC(on) | 7.5 | 8.0 | 9.0 | 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
- Pb-Free and Halide-Free Devices
Applications
The NCP1053ST136T3G is suitable for various applications requiring high efficiency and low standby power, including:
- Cellular phone chargers
- Standby power supplies for personal computers
- Secondary bias supplies for microprocessor keep-alive supplies
- IR detectors
Q & A
- What is the operating voltage range for the NCP1053ST136T3G?
The device operates from a rectified AC line source ranging from 85 V to 265 V.
- What are the oscillator frequency options for this device?
The oscillator frequency options are 44 kHz, 100 kHz, and 136 kHz.
- Does the NCP1053ST136T3G have thermal protection?
- What is the purpose of the startup circuit in the NCP1053ST136T3G?
The startup circuit eliminates the need for a transformer auxiliary bias winding and provides active startup regulation.
- How does the device protect against converter overload?
The device includes fault logic with a programmable timer for converter overload protection and auto restart or latched off fault detect options.
- What is the maximum duty cycle of the oscillator?
The maximum duty cycle is 74% to 80%.
- Does the NCP1053ST136T3G support low standby power applications?
- What are the package options for the NCP1053ST136T3G?
The device is available in 8-pin PDIP and 4-pin SOT-223 packages.
- How does the device reduce EMI?
The device incorporates oscillator frequency dithering with a controlled slew rate driver to reduce EMI.
- Is the NCP1053ST136T3G Pb-Free and Halide-Free?
