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Ricoh Electronic Devices Co., Ltd. launches R1700 series, a zero-voltage switching (ZVS) PFC/LED driver controller

February 6, 2018
Ricoh Electronic Devices Co., Ltd.

Ricoh Electronic Devices Co., Ltd. launched R1700 series, a zero-voltage switching (ZVS) PFC/LED driver controller with a variable output current/voltage. The R1700 is a multi-purpose PFC controller equipped with various functions and characteristics. This device is capable of setting output voltage/current by inputting PWM signals, which make this device suitable to be used as a variable voltage PFC controller or a variable voltage LED driver controller with PFC.

The R1700 features edge resonant control of zero-voltage switching (ZVS) that helps to reduce switching loss and electromagnetic interference (EMI) and realizes a power factor correction (PFC) circuit. This device is adopting a synchronous rectification ZVS, which significantly improves efficiency in the device operation with the wide input/output voltage range. This device is designed for high switching frequency operation that allows the thinning/downsizing of the peripheral components and power supply systems.

Integration of this device and the R1580 series, constant-current LED driver controller, forms the two-stage linear dimmable LED driver which realizes flicker-free/low EMI operation. This two-stage architecture enables photographing of a clear image without being affected by LED flickers or noise issues.


Image: R1700

R1700 (SSOP-16 Package)


Input Voltage Range 8 V to 650 V
Operating Temperature Range -40℃ to 85℃
PWM Linear Dimming Control Range 5% to 100%
Protection Function Over Current Protection (OCP)
Thermal Shut Down Protection (TSD)
BST/VCC pin Under Voltage Lock Out (UVLO)
VCC pin Over Voltage Lock Out (OVLO)
Over Voltage Protection (FBOVP)
Latch-type Protection
Corresponding Topologies Buck-boost (Inverting) PFC
Variable Output Current PFC, Linear Dimming
Variable Output Voltage PFC
Boost PFC
Buck PFC
Package SSOP-16