Overview
The NCP1015AP065G, produced by ON Semiconductor, 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 an ideal solution for building rugged and low-cost power supplies. The NCP1015 is housed in either a PDIP-7 or SOT-223 package and features advanced functionalities such as soft-start, frequency jittering, short-circuit protection, and skip-cycle mode to ensure high efficiency at light loads.
Key Specifications
| Symbol | Description | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VCC(off) | VCC increasing level at which the current source turns-off | 7.9 | 8.5 | 9.1 | V |
| VCC(on) | VCC decreasing level at which the current source turns-on | 6.9 | 7.5 | 8.1 | V |
| VCCLATCH | Decreasing level at which the Latch-off phase Ends | 4.4 | 4.7 | 5.1 | V |
| ICC1 (65 kHz) | Internal IC consumption, MOSFET switching at 65 kHz | 0.92 | 1.0 | 1.1 | mA |
| ICC1 (100 kHz) | Internal IC consumption, MOSFET switching at 100 kHz | 0.95 | 1.05 | 1.15 | mA |
| Peak Current Limit | Maximum peak current set-point | - | 350 | - | mA |
| Switching Frequency | Available switching frequencies | - | 65 kHz / 100 kHz | - | kHz |
| MOSFET Voltage Rating | Voltage rating of the internal MOSFET | - | 700 | - | V |
Key Features
- Dynamic Self-Supply (DSS): No need for an auxiliary winding; the IC can be supplied directly from the high-voltage DC rail, simplifying transformer design and improving control in difficult output conditions.
- Short-Circuit Protection: The IC detects short-circuits by monitoring the feedback line activity and reduces output power to protect the system.
- Skip-Cycle Mode: Automatically enters skip-cycle mode at light loads to maintain high efficiency and eliminate acoustic noise.
- Soft-Start: Features a 1 ms internal soft-start activated during power-on sequences and over-current conditions to prevent inrush currents.
- Frequency Jittering: Natural ripple on the VCC participates in frequency jittering, enhancing noise immunity.
- Low Standby Power: Optimized for low standby power consumption, making it suitable for energy-efficient applications.
Applications
- Low Power AC-DC Adapters for Chargers: Ideal for charging devices with low power requirements.
- Auxiliary Power Supplies: Suitable for USB, appliances, TVs, and other consumer electronics.
Q & A
- What is the primary function of the NCP1015AP065G?
The NCP1015AP065G is a self-supplied monolithic switcher designed for low standby-power offline Switch-Mode Power Supplies (SMPS).
- What are the available switching frequencies for the NCP1015AP065G?
The available switching frequencies are 65 kHz and 100 kHz.
- What is the voltage rating of the internal MOSFET?
The internal MOSFET has a voltage rating of 700 V.
- How does the NCP1015AP065G handle short-circuit conditions?
The IC detects short-circuits by monitoring the feedback line activity and reduces output power to protect the system.
- What is the purpose of the Dynamic Self-Supply (DSS) feature?
The DSS feature allows the IC to be supplied directly from the high-voltage DC rail, eliminating the need for an auxiliary winding and simplifying transformer design.
- How does the skip-cycle mode improve efficiency?
The skip-cycle mode allows the IC to maintain high efficiency at light loads by reducing the switching frequency, thus eliminating acoustic noise.
- What is the duration of the internal soft-start feature?
The internal soft-start feature lasts 1 ms and is activated during power-on sequences and over-current conditions.
- How does frequency jittering enhance the performance of the NCP1015AP065G?
Frequency jittering, caused by the natural ripple on the VCC, enhances noise immunity and reduces electromagnetic interference (EMI).
- What are the typical applications of the NCP1015AP065G?
Typical applications include low power AC-DC adapters for chargers and auxiliary power supplies for USB, appliances, TVs, and other consumer electronics.
- How can the standby power be further reduced in the NCP1015AP065G?
Connecting an auxiliary winding can disable the self-supply operation and reduce standby power consumption further.
