Overview
The NCP1015ST65T3G, produced by onsemi, is a self-supplied monolithic switcher designed for low standby power offline Switch-Mode Power Supplies (SMPS). This integrated circuit combines a fixed-frequency current-mode controller with a 700 V voltage MOSFET, making it a comprehensive solution for building rugged and low-cost power supplies. Available in PDIP-7 and SOT-223 packages, the NCP1015ST65T3G offers features such as soft-start, frequency jittering, short-circuit protection, and skip-cycle mode to enhance efficiency and reliability.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC(off) | 7.9 | 8.5 | 9.1 | V |
| VCC(on) | 6.9 | 7.5 | 8.1 | V |
| VCCLATCH | 4.4 | 4.7 | 5.1 | V |
| ICC1 (65 kHz) | - | 0.92 | 1.1 | mA |
| ICC1 (100 kHz) | - | 0.95 | 1.15 | mA |
| Drain Voltage | - | - | 700 | V |
| Peak Current Limit | - | - | 450 | mA |
| Switching Frequency | 65 | - | 100 | kHz |
Key Features
- Dynamic Self-Supply (DSS): Eliminates the need for an auxiliary winding, simplifying transformer design and ensuring better control in difficult output conditions.
- Short-Circuit Protection: Detects short-circuits and reduces output power to protect the system.
- Low Standby Power: Achieves low standby power by skipping unnecessary switching cycles, especially at light loads.
- No Acoustic Noise: Cycle skipping occurs without generating acoustic noise, allowing the use of cost-effective magnetic components.
- Soft-Start: Features a 1 ms internal soft-start to gradually increase the peak current during power-on sequences and overcurrent conditions.
- Frequency Jittering: Reduces electromagnetic interference (EMI) by introducing frequency jittering.
- SPICE Models: Available for transient cycle-by-cycle simulations and averaged loop simulations.
Applications
The NCP1015ST65T3G is suitable for a variety of applications requiring efficient and reliable power supplies, including:
- Universal power adapters
- Offline power supplies for consumer electronics
- Industrial power supplies requiring low standby power
- LED lighting power supplies
- Other low-cost, high-efficiency SMPS designs
Q & A
- What is the primary function of the NCP1015ST65T3G?
The NCP1015ST65T3G is a self-supplied monolithic switcher designed for low standby power offline Switch-Mode Power Supplies (SMPS).
- What are the available package types for the NCP1015ST65T3G?
The component is available in PDIP-7 and SOT-223 packages.
- What is the maximum drain voltage of the NCP1015ST65T3G?
The maximum drain voltage is 700 V.
- How does the Dynamic Self-Supply (DSS) feature work?
The DSS feature allows the IC to be supplied directly from the high-voltage DC rail, eliminating the need for an auxiliary winding.
- What is the purpose of the soft-start feature in the NCP1015ST65T3G?
The soft-start feature gradually increases the peak current during power-on sequences and overcurrent conditions to prevent sudden spikes.
- How does the NCP1015ST65T3G reduce standby power?
The IC reduces standby power by skipping unnecessary switching cycles at light loads.
- What is the significance of frequency jittering in the NCP1015ST65T3G?
Frequency jittering helps reduce electromagnetic interference (EMI).
- Does the NCP1015ST65T3G generate acoustic noise during operation?
No, the cycle skipping mechanism is designed to avoid generating acoustic noise.
- What kind of protection does the NCP1015ST65T3G offer against short-circuits?
The IC detects short-circuits and reduces output power to protect the system.
- Are SPICE models available for the NCP1015ST65T3G?
Yes, SPICE models are available for transient cycle-by-cycle simulations and averaged loop simulations.
