The RT8555WSC Evaluation Board is a high efficiency driver for white LEDs. It is suitable for single/two cell battery input to drive LED light bars which contains six strings in parallel and up to 10 WLEDs per string. The internal current sinks support a maximum of ±2% current mismatching for excellent brightness uniformity in each string of LEDs. To provide enough headroom for current sink operation, the Boost controller monitors the minimum voltage of the feedback pins and regulates an optimized output voltage for power efficiency.
The RT8555 has a wide input voltage operating range from 2.7V to 24V and contains I2C interface for controlling the dimming mode, operating frequency and the LED current. The internal 100mΩ, 36V power switch with current-mode control provides over-current protection. The switching frequency of the RT8555 is adjustable from 300kHz to 2MHz, which allows flexibility between efficiency and component size. The RT8555 is available in the WL-CSP-20B 1.65 x 2.05 (BSC), with pitch 0.4mm package.
Manufacturer | Richtek USA Inc. |
---|---|
Category | Lighting |
Sub-Category | LED Drivers - DC In |
Eval Board Part Number | EVB_RT8555WSC-ND |
Eval Board Supplier | Richtek USA Inc. |
Eval Board |
Normally In Stock
|
Voltage In |
2.7 ~ 24 V
|
Topology |
Step Up
|
Current Out |
35 mA
|
Voltage Out (Max) |
36 V
|
Outputs and Type |
6 Non-Isolated
|
Efficiency @ Conditions |
>90%, 54 LEDs @ 12 ~ 24V in
|
Features |
Current Limit (Adj. or Fixed)
Dimming Control I²C Interface Open Circuit Protection Over Current Protection Over Voltage Protection PWM Interface Shutdown, Enable, Standby Thermal Protection Under Voltage Protection, Brown-Out |
Switching Frequency |
900 kHz
|
Component Count + Extras |
19 + 34
|
Design Author |
Richtek USA Inc.
|
Application / Target Market |
LCD Backlighting
LCD TV / Monitor Portable Devices Tablets |
Main I.C. Base Part |
RT8555
|
Date Created By Author | 2015-09 |
Date Added To Library | 2022-06 |