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  Richtek Technology Electronic Components Datasheet  

RT8573 Datasheet

High Voltage Boost/SEPIC Controller

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Preliminary
RT8573
High Voltage Boost/SEPIC Controller
General Description
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.
Ordering Information
RT8573
Package Type
S : SOP-16
Note :
Operating Temperature Range
G : Green (Halogen Free with Commer-
cial Standard)
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.
Marking Information
RT8573
GSYMDNN
RT8573GS : Product Number
YMDNN : Date Code
Features
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
Frequency
z Easy Dimming Control : Analog or Digital
Converting to Analog with One External Capacitor
z True PWM Dimming : External FET Driver is Build-
In
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
Applications
z General Industrial High Power LED Lighting
z Desk Lights and Room Lighting
z Building and Street Lighting
z Industrial Display Backlight
Pin Configurations
(TOP VIEW)
GBIAS
GATE
PWMOUT
ISW
PWMDIM
ISP
ISN
VC
2
3
4
5
6
7
8
16 GND
15 VCC
14 RSET
13 OVP
12 EN
11 SS
10 DCTL
9 ACTL
SOP-16
DS8573-P00 August 2010
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT8573 Datasheet

High Voltage Boost/SEPIC Controller

No Preview Available !

RT8573
Preliminary
Typical Application Circuit
4.5V to 3V6IVN
5V
L1
47µH
1C0INµF
RT8573
15 VCC
GATE 2
12 EN
ISW 4
D1
COUT
1µF
M1
RSW
0.05
RRSET
30k Analog
Dimming
R1.V8Ck
1C0VnCF
C0.S1SµF
14 RSET
ISP 6
9 ACTL
10 DCTL
8 VC
11 SS
1 GBIAS
ISN 7
OVP 13
PWMOUT 3
PWMDIM 5
C1µBF GND
16
R1
R2
VOUT
VOUT
14 LEDs
RSENSE
Figure 1. Analog Dimming in Boost Configuration
L1
VIN
4.5V to 36V
5V
47µH
CIN
10µF
RT8573
15 VCC
GATE 2
12 EN
ISW 4
D1
COUT
1µF
M1
RSW
0.05
VOUT
14 LEDs
14 RSET
ISP 6
RRSET
30k
PWM
10 DCTL
Dimming control
8 VC
ISN 7
RSENSE
1R.V8Ck
1C0VnCF
CSS
0.1µF
CB
1µF
11 SS
1 GBIAS
9 ACTL
OVP 13
PWMOUT 3
PWMDIM 5
C0.A47µF
GND
16
R1
R2
VOUT
Figure 2. PWM to Analog Dimming in Boost Configuration
www.richtek.com
2
DS8573-P00 August 2010


Part Number RT8573
Description High Voltage Boost/SEPIC Controller
Maker Richtek
Total Page 17 Pages
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