Overview
The NCP1253BSN100T1G is a highly integrated current-mode PWM controller designed by ON Semiconductor for use in offline power supplies. This component is packaged in a compact TSOP-6 package and is capable of delivering high performance and ruggedness. It operates at a fixed frequency of 100 kHz and features advanced protections and control mechanisms, making it an ideal choice for various power supply applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Switching Frequency | 100 | kHz |
| Supply Voltage (VCC) | Up to 28 | V |
| Maximum Junction Temperature | 150 | °C |
| Minimum Operating Temperature | -40 | °C |
| Maximum Operating Temperature | 125 | °C |
| Output Current | 500 | mA |
| Package Type | TSOP-6 | |
| ESD Capability (Human Body Model) | 2 kV | |
| ESD Capability (Machine Model) | 200 V | |
| Internal Soft-Start Duration | 4 ms | |
| Frequency Foldback | Down to 26 kHz | |
| Skip-Cycle Level Voltage | 300 mV |
Key Features
- Fixed-Frequency Current-Mode Control Operation: Operates at 100 kHz with adjustable slope compensation to avoid sub-harmonic oscillations.
- Frequency Foldback and Skip-Cycle: Reduces switching frequency down to 26 kHz and enters skip-cycle in light load conditions to minimize standby power.
- Internally Fixed Soft-Start: 4 ms soft-start duration to ensure smooth startup.
- Timer-Based Auto-Recovery or Latched Short-Circuit Protection: Protects against short-circuits with either auto-recovery or latched protection depending on the version.
- Over Voltage Protection (OVP) on VCC: Latched OVP to protect the circuit from overvoltage conditions.
- Low No-Load Standby Power: Extremely low standby power consumption.
- EMI Jittering: Internal low-frequency modulation to improve EMI signature.
Applications
- AC-DC converters for TVs, set-top boxes, and printers.
- Offline adapters for notebooks and netbooks.
- Low-cost AC-DC adapters and open-frame power supplies.
Q & A
- What is the switching frequency of the NCP1253BSN100T1G?
The switching frequency is 100 kHz. - What is the maximum supply voltage (VCC) for this controller?
The maximum supply voltage is up to 28 V. - What protection mechanisms does the NCP1253BSN100T1G have against short-circuits?
The controller has either timer-based auto-recovery or latched short-circuit protection depending on the version. - How does the frequency foldback feature work?
The frequency foldback reduces the switching frequency down to 26 kHz in light load conditions and enters skip-cycle to minimize standby power. - What is the purpose of the internal soft-start duration?
The 4 ms soft-start duration ensures a smooth startup sequence. - How does the Over Voltage Protection (OVP) on VCC work?
The OVP comparator monitors the VCC pin and latches the converter off if the voltage exceeds the set threshold. - What is the significance of EMI jittering in this controller?
EMI jittering helps in spreading out energy in conducted noise analysis, improving the EMI signature. - What are the typical applications of the NCP1253BSN100T1G?
Typical applications include AC-DC converters for TVs, set-top boxes, and printers, as well as offline adapters for notebooks and netbooks. - What is the package type of the NCP1253BSN100T1G?
The package type is TSOP-6. - What is the maximum junction temperature for this controller?
The maximum junction temperature is 150°C.
