Overview
The NCP1351BDR2G is a current-mode controller designed by onsemi, targeting low-power off-line flyback Switched Mode Power Supplies (SMPS) where cost efficiency is crucial. This controller employs a quasi-fixed TON (turn-on time) technique, which adjusts the switching frequency based on the load conditions to optimize efficiency and minimize standby power consumption. It features an extremely low startup current, peak current compression to reduce transformer noise, and natural frequency dithering to improve the EMI signature. The NCP1351BDR2G is available in an SOIC-8 package and is Pb-Free, making it suitable for a variety of applications including auxiliary power supplies, printers, game stations, and low-cost adapters.
Key Specifications
| Symbol | Description | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VSUPPLY | Maximum Supply on VCC Pin | -0.3 | 28 | V | |
| ISUPPLY | Maximum Current in VCC Pin | 20 | mA | ||
| VDRV | Maximum Voltage on DRV Pin | -0.3 | 20 | V | |
| IDRV | Maximum Current in DRV Pin | 400 | mA | ||
| TJMAX | Maximum Junction Temperature | 150 | °C | ||
| Switching Frequency | 65 | kHz | |||
| Duty Cycle - Max | 50 | % | |||
| Output Voltage | 15 | V | |||
| Output Current | 400 | mA |
Key Features
- Quasi-fixed TON, Variable TOFF Current Mode Control: Adjusts switching frequency based on load conditions.
- Extremely Low Current Consumption at Startup: Optimized internal supply block for low startup current.
- Peak Current Compression: Reduces peak current in light load conditions to prevent transformer noise.
- Primary or Secondary Side Regulation: Flexible regulation options.
- Dedicated Latch Input for OTP, OVP: Overtemperature and overvoltage protection.
- Programmable Current Sense Resistor Peak Voltage: Allows optimization of power dissipation.
- Natural Frequency Dithering for Improved EMI Signature: Smoothes EMI signature through frequency variation.
- Easy External Over Power Protection (OPP): Protects against over-power conditions.
- Undervoltage Lockout: Prevents operation below minimum VCC voltage.
- Very Low Standby Power via Off-time Expansion: Minimizes standby power consumption.
- SOIC-8 Package: Compact and Pb-Free package.
- Dual Trip Point Overcurrent Protection: Latched or auto-recovery options for overcurrent protection.
Applications
- Auxiliary Power Supply: Suitable for auxiliary power needs in various systems.
- Printers and Game Stations: Ideal for power supplies in printers and gaming consoles.
- Low-Cost Adapters: Used in cost-effective adapter designs.
- Off-line Battery Charger: Applicable for battery charging applications.
Q & A
- What is the maximum supply voltage for the VCC pin of the NCP1351BDR2G?
The maximum supply voltage for the VCC pin is 28 V.
- What is the typical switching frequency of the NCP1351BDR2G?
The typical switching frequency is 65 kHz.
- What is the purpose of the peak current compression feature?
The peak current compression feature reduces the peak current in light load conditions to prevent transformer noise and acoustic resonance.
- How does the NCP1351BDR2G handle overcurrent protection?
The NCP1351BDR2G offers dual trip point overcurrent protection with latched or auto-recovery options depending on the version.
- What is the maximum junction temperature for the NCP1351BDR2G?
The maximum junction temperature is 150°C.
- What is the duty cycle limit for the NCP1351BDR2G?
The maximum duty cycle is 50%.
- How does the natural frequency dithering improve the EMI signature?
Natural frequency dithering smoothes the EMI signature by varying the switching frequency with the natural bulk ripple voltage.
- What is the purpose of the dedicated latch input for OTP and OVP?
The dedicated latch input provides protection against overtemperature and overvoltage conditions.
- Can the NCP1351BDR2G be used for primary or secondary side regulation?
Yes, the NCP1351BDR2G supports both primary and secondary side regulation.
- What package type and how many pins does the NCP1351BDR2G have?
The NCP1351BDR2G comes in an SOIC-8 package, which is Pb-Free.
