Overview
The NCP12510BSN65T1G is a highly integrated current-mode PWM controller designed by onsemi for offline power supplies. This component is packaged in a compact TSOP-6 (SOT23-6) package, making it ideal for applications where space is limited. It operates at a fixed frequency of 65 kHz and is capable of delivering high performance and robustness in various power supply designs.
The NCP12510BSN65T1G is an improved version of the popular NCP1250 flyback controller, offering enhanced features such as frequency foldback, skip-cycle in light load conditions, and internal slope compensation. It also includes advanced protection mechanisms like over power protection (OPP), over voltage protection (OVP), and short-circuit protection.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| VCC Power Supply Voltage | -0.3 to 35 | V |
| Oscillation Frequency (nominal) | 65 kHz | kHz |
| Maximum Duty Ratio | 76 to 84 | % |
| Internal Equivalent Feedback Resistance | 29 kΩ | kΩ |
| Over Voltage Protection (VCC pin) | 24.0 to 27.0 | V |
| Short-Circuit Protection Delay Time | 600 ns | ns |
| Internal Fault Timer Duration | 100 to 130 ms | ms |
| DRV Pin Voltage (H state) | 7.5 V | V |
| Soft-Start Time | 4 ms | ms |
Key Features
- Fixed-frequency 65 kHz current-mode control operation with frequency foldback down to 26 kHz and skip-cycle in light load conditions.
- Internal and adjustable over power protection (OPP) circuit.
- Auto-recovery over voltage protection (OVP) on the VCC pin.
- Internal and adjustable slope compensation.
- Internal fixed 4 ms soft-start.
- Auto-recovery or latched short-circuit protection with pre-short ready for latched OCP version.
- OVP/OTP latch input for improved robustness.
- +300 mA / -500 mA source/sink drive capability.
- Improved consumption and reset time in latch state.
- High robustness and high ESD capabilities.
- EPS 2.0 compliant.
- Pb-free device.
Applications
- AC-DC converters for TVs, set-top boxes, and DVD players.
- Offline adapters for notebooks and netbooks.
- Low-cost AC-DC adapters and open-frame power supplies.
Q & A
- What is the operating frequency of the NCP12510BSN65T1G?
The NCP12510BSN65T1G operates at a fixed frequency of 65 kHz.
- What is the maximum power supply voltage for the VCC pin?
The maximum power supply voltage for the VCC pin is 35 V.
- Does the NCP12510BSN65T1G have over voltage protection?
Yes, it has auto-recovery over voltage protection (OVP) on the VCC pin.
- What is the purpose of the internal slope compensation?
The internal slope compensation helps to prevent sub-harmonic oscillations by allowing the user to sum the slope compensation signal with the sensed current.
- How does the frequency foldback feature work?
The frequency foldback feature reduces the switching frequency down to 26 kHz as the power on the secondary side decreases, and it enters skip-cycle mode in very light load conditions.
- What is the soft-start time of the NCP12510BSN65T1G?
The soft-start time is fixed at 4 ms.
- Does the NCP12510BSN65T1G have short-circuit protection?
Yes, it has auto-recovery or latched short-circuit protection with pre-short ready for latched OCP versions.
- What are the typical applications of the NCP12510BSN65T1G?
Typical applications include AC-DC converters for TVs, set-top boxes, and DVD players, as well as offline adapters for notebooks and netbooks.
- Is the NCP12510BSN65T1G Pb-free?
Yes, the NCP12510BSN65T1G is a Pb-free device.
- What is the drive capability of the DRV pin?
The DRV pin has a +300 mA / -500 mA source/sink drive capability.
