Ricoh launches a LED Driver Controller with PFC and low EMI emission for mains powered LED lighting applications
A conventional LED driver circuit usually consists of two switching DC/DC Converters whilst Ricoh's solution uses a unique one stage switching conversion with an advanced buck-boost (inverting) topology. Additionally, an edge resonance controlled Zero Voltage Switching (ZVS) circuit allows a high operating frequency. These two features accept the use of smaller and less bulky components which makes the application suitable for integration in regular but also small and thin sized lighting fixtures. Compared to conventional circuits, a board-space reduction of 70% and height reduction of 50% can be achieved. A second significant advantage of Ricoh’s approach is that the electronic circuit emits considerable less EMI noise.
Ricoh’s R1700 is a high efficient Power Factor Correction (PFC) controller with ZVS, which significantly reduces the switching loss and switching noise generated by synchronous rectification. The PFC circuit improves the ratio between active and apparent power resulting in a lower load current from the source (energy supplier).
The LED brightness level can be dimmed from 100% to 5% by connecting a PWM signal to the DIM input. As an alternative option one could consider adding the R1580 constant current driver into the circuit. This IC converts a PWM signal into a linear dimming signal, the main advantages of this method is that the LED driver MOSFET is not continuously switching which supresses the harmonic current and EMI emission and results in a flicker-free LED operation. Especially when the light source is used for recording photos and videos, the resulting footage quality may be effected by flickering illumination. Striking effects are areas or lines on the footage with a different exposure. Another advantage of the R1580 is its wide dimming range, it extends the standard range from a minimum setting of 5% to 0.5%. In particular for RGB LED configurations, the extended dimming range ensures a wide control of the colour temperature settings.
Features R1700 | |
Input Voltage Range: | 8 V to 650 V |
PWM Linear Dimming Control Range: | 100% to 5% |
Built-in 650 V Regulator | |
Built-in Half Bridge Gate Driver | |
Buck-boost (Inverting) PFC | |
Corresponding Topologies: | Variable Output Current PFC, Linear Dimmable |
Variable Output Voltage PFC | |
Boost PFC | |
Protection Circuits: | Buck PFC |
Overcurrent Protection (OCP) | |
Thermal Shutdown (TSD) | |
BST/VCC Pin Undervoltage Lockout (UVLO) | |
VCC Pin Overvoltage Lockout (OVLO) | |
FB Pin Overvoltage Protection (FBOVP) | |
Package R1700V: | Latch-type Protection (Optional) |
| About Ricoh |
Ricoh is empowering digital workplaces using innovative technologies and services that enable individuals to work smarter from anywhere.
With cultivated knowledge and organizational capabilities nurtured over its 85-year history, Ricoh is a leading provider of digital services, information management, and print and imaging solutions designed to support digital transformation and optimize business performance.
Headquartered in Tokyo, Ricoh Group has major operations throughout the world and its products and services now reach customers in approximately 200 countries and regions. In the financial year ended March 2022, Ricoh Group had worldwide sales of 1,758 billion yen (approx. 14.5 billion USD).
For further information, please visit www.ricoh-europe.com
© 2023 RICOH COMPANY, LTD. All rights reserved. All referenced product names are the trademarks of their respective companies.
For further information, please contact:
Ricoh Europe PLC
Charlotte Fernandez
E-mail: media@ricoh-europe.com
Homepage: www.ricoh-europe.com
Join us on Facebook: www.facebook.com/ricoheurope
Follow us on Twitter: www.twitter.com/ricoheurope
Follow us on LinkedIn: http://linkedin.com/company/ricoh-europe
Visit the Ricoh media centre at: www.ricoh-europe.com/press