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Special Contents for Automotive Applications
Electrification of automobile by RICOH power management IC
The reason RICOH power management IC has been chosen for more than 20 years
Special Contents for IoT Devices
Supporting your IoT system construction
Ultra-low supply current / Low noise / Low electromotive force / Battery monitoring
Special Contents for Industrial Applications
RICOH's 3 approaches to industrial equipment field
Long term supply / Flexible quantity purchase / High quality and reliability
Design Support
Technical Information on Power Management ICs
Small in Size, Efficient in Heat Dissipation and Suitable for Automotive.
Ricoh's Thermal Design Support
You can analyze thermal characteristics at customer's concept design stage
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About RICOH Electronic Devices
Application Note : DCDC Converters (Switching Regulators)
The LED brightness is set by the current through the LEDs, it can be controlled by the Duty of a PWM signal applied to the CE pin.
The current through the LEDs can be calculated by the following formula.
ILED = Hduty × VFB / R1
Following product with high-speed dimming control can be used in the PWM signal range between 200 Hz to 300 kHz.
When controlling the LED brightness with a PWM signal of 20 kHz or less; The variation of the inductor current might cause audible sounds, please use a PWM signal in the high frequency area to avoid this.
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