40W Desktop Printer Power Solution Based on ON Semiconductor NCP1351
Imaging equipment is part of our daily lives. They include copiers, digital copiers, fax machines, mail machines, multifunction devices (MFD), printers and scanners. We use it extensively for personal and professional purposes: from large copiers-printers-scanners in the office to desktop printers we own at home, giving us the joy of getting photos of your last holiday or family event quickly. Commercially available imaging products used as hard copy output devices and capable of receiving information from a single user or networked computer or other input device (eg, a digital camera) must all be capable of being powered from a wall outlet or data or network connection.
In response to the current desktop printer power supply market, Jotrin has launched a 40W printer power solution based on ON NCP1351. This solution uses the design of NCP1351 to provide an ideal solution for printer adapter applications. Thanks to a fixed peak current / variable off-time architecture, the adapter has high efficiency and very low no-load power consumption from rated load to light load (including various printer sleep modes). It also has the ability to provide peak power instantaneously, while providing effective protection functions such as latched overload, short circuit and overvoltage protection. In addition, the unique NCP1351 architecture reduces high-voltage input capacitors by one-third compared to the latest printer adapters, saving cost and size for the same performance. The NCP1351 implements a fixed peak current mode control (also known as "quasi-fixed" ton) and adjusts the cut-off time based on output power requirements. Under high power conditions, the switching frequency increases until it reaches a maximum. This upper limit depends on the external capacitor chosen by the designer. Under light load conditions, the off time will be extended and the NCP1351 will operate at a lower frequency. As the frequency decreases, the contribution of all frequency-related losses (driver current, drain capacitance loss, switching loss) is correspondingly reduced, which naturally improves the efficiency at various load levels.
Scene application diagram
Display board photos
Solution block diagram
Core technology advantages
1. Peak current compression at light loads
Lowering the frequency will definitely force the converter into the audible range. To prevent mechanical resonance of the transformer, as the load becomes lighter, the NCP1351 gradually reduces (compresses) the peak current set value. When the current reaches 30% of the nominal value, compression stops and the off time continues to extend to low frequencies.
2. Low standby power
Frequency reduction technology provides an excellent solution for designers looking for low standby power converters. Moreover, compared to the skip cycle method, the smooth off-time extension does not introduce additional ripple under no-load conditions: the output voltage remains quiet.
3. Natural frequency jitter: The quasi-fixed ton mode operation improves the EMI signal because the switching frequency varies with the natural volume ripple voltage.
4. Very low startup current: Based on a proprietary circuit, the power consumption of the startup part of the NCP1351 during startup does not exceed 10 μA. As a result, designers can easily combine startup time with standby power consumption.
5. Overload protection based on fault timers: Every designer knows the pain of building a converter without having to obtain precise overcurrent limits. When fault detection relies on auxiliary VCC, the pain can even worsen. Here, the NCP1351C observed a lack of feedback current and could not start the timer to count down. After charging is over, the timer will permanently turn off the controller. The NCP1351C is unique in that when the controller provides the maximum power (corresponding to the maximum switching frequency), the fault timer does not start, but starts at 60% of this maximum power: this means that when the timer counts the power supply Provides higher power instantly. This is particularly suitable for printer adapter applications where the power supply must be able to provide transient power peaks while meeting the requirements of a limited power supply (LPS).
6. Latch fault input: Dedicated input allows the designer to trigger the latch externally to establish additional protection, such as overvoltage (OVP) or overheating (OTP).
1. Input voltage
85 Vac to 265 Vac, 47-63 Hz
2. Output voltage
32 V / 1 A, 16 V / 0.625 A
3. Peak power
• 80 W (32 V / 2.5 A and 16 V / 0 A) during 40 ms
• 62 W (32 V / 1.94 A and 16 V / 0 A) during 400 ms
•> 80% at full load (40 W)
•> 70% in sleep modes (2 W and 4 W)
• Pin <0.3 W in no-load conditions
• Latched over-power protection below 100 W (compliant with LPS)
• Latched overvoltage protection (OVP)
• Latch recovery time <3s
6. Startup time <3s
7. No damage during under voltage and under voltage test, the output voltage will not rebound
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