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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
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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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- Application Note : DCDC Converters (Switching Regulators)
- LED High-speed Dimming Control
Application Note : DCDC Converters (Switching Regulators)
LED High-speed Dimming Control
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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- PWM Control and VFM Control
- Internal or External Output Transistors
- Output Voltage Setting
- Diode Rectifier and Synchronous Rectifier
- Undervoltage Lockout (UVLO) Function
- Soft-Start Function
- Externally Programmable Maximum Duty Cycle
- Externally Adjustable Phase Compensation
- Overvoltage Protection (OVP)
- Overcurrent Protection
- Sequence Control
- Shutdown Function
- LED High-speed Dimming Control
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