Driver IC. CN5820 Datasheet
Switch-Mode High-Brightness LED Driver IC
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
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
Architectural, Industrial, and Ambient Lighting
Automotive RCL, DRL, and Fog Lights
MR16 and Other LED Bulbs
Indicators and Emergency Lighting
Typical Application Circuit：
Input Supply RCS
Figure 1 Typical Application Circuit
SOT23-6 Tape and Reel, 3000/Reel
Operating Temperature Range
－40℃ to 85℃
Figure 2 Block Diagram
Current Sense Negative Input. A current sense resistor RCS between VIN and
CSN is needed to sense the LED current.
Dimming Input. When the voltage at DIM pin is below 0.4V, DRV is driven
to low, and LED is turned off. When DIM voltage is higher than 1.2V, CN5820
regulates the LED current normally, the LED average current is (0.16V／RCS);
When DIM voltage is between 0.4V and 1.2V, the LED current is controlled by
DIM voltage, LED average current is (0.133×VDIM／RCS).
The Positive Terminal of Input Supply. In addition to powering the internal
circuits, VIN pin also serves as the positive terminal of current sense.
5V Regulator Output. Connect a 4.7uF or 10uF capacitor from VCC to GND,
the maximum output current is 5mA.
Gate Drive Output for External MOSFET. Connect to the gate of an
external N-channel MOSFET.