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Switch-Mode High-Brightness LED Driver IC
Product Profile
   Application Note
General Description:
The CN5820 is a switch-mode step-down constant-current high-brightness LED (HB LED) driver, the device provides
a cost effective solution for automotive interior/exterior lighting, architectural and ambient lighting, LED bulbs such
as MR16 and other LED illumination applications.The CN5820 operates from a 4V to 28V input voltage range and
features a 5V/5mA on-board regulator. A high-side current-sense resistor adjusts the LED current and a dedicated
input (DIM) enables PWM dimming and analog dimming.
The CN5820 is well suited for applications requiring a wide input voltage range. The high-side current-sensing and
an integrated current-setting circuitry minimize the number of external components while delivering an LED current
with ±5% accuracy. A hysteretic control algorithm ensures excellent input-supply rejection and fast response during
load transients and PWM dimming.The CN5820 features a 20% inductor current ripple.These devices operate up to
1MHz switching frequency, thus allowing for small component size.
The CN5820 operates over the -40°C to +85°C temperature range and is available in 6-pin SOT23 package.
MR16 and Other LED Bulbs Architectural, Industrial, and Ambient Lighting
Indicators and Emergency Lighting Automotive RCL, DRL, and Fog Lights
High-Side Current Sense
Dedicated Dimming Control Input
20kHz Maximum Dimming Frequency
Hysteretic Control: No Compensation
Up to 1MHz Switching Frequency
±5% LED Current Accuracy
Adjustable Constant LED Current
4V to 28V Input Voltage Range
Over 25W Output Power
5V, 5mA On-Board Regulator
Operating Temperature Range :-40°C to 85°C
Lead Free, rohs-Compliant and Halogen Free
Application Note
Quick Start of CN5820 Demo Board
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