High Voltage Boost/SEPIC Controller
The RT8573 is a current mode PWM controller designed
to drive an external MOSFET for high current LED
applications. With a low side current sense amplifier
threshold of 190mV, the LED current is programmable
with one external current sense resistor.
With programmable operating frequency up to 800kHz,
the external inductor and capacitors can be small while
maintaining high frequency.
Dimming can be done by either analog or digital. A built-in
clamping comparator and filter allow easy low noise analog
dimming conversion from digital signal with only one
external capacitor. An unique True PWM dimming control
is made easy with MOSFET under LED string. A very high
dimming ratio can be achieved by adopting both analog/
digital dimming and True PWM dimming together.
The RT8573 is available in a SOP-16 package.
S : SOP-16
Operating Temperature Range
G : Green (Halogen Free with Commer-
Richtek Green products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
RT8573GS : Product Number
YMDNN : Date Code
z High Voltage Capability : VIN Up to 36V, VOUT is
limited by External MOSFET Switch
z Boost Operation
z Current Mode PWM with Programmable Switching
z Easy Dimming Control : Analog or Digital
Converting to Analog with One External Capacitor
z True PWM Dimming : External FET Driver is Build-
z Programmable Soft-Start to Avoid Inrush Current
z Programmable Over Voltage Protection
z VIN Undervoltage Lockout and Thermal Shutdown
z 16-Lead SOP Package
z RoHS Compliant and Halogen Free
z General Industrial High Power LED Lighting
z Desk Lights and Room Lighting
z Building and Street Lighting
z Industrial Display Backlight
DS8573-P00 August 2010