Boost/SEPIC Controller. RT8480 Datasheet

RT8480 Controller. Datasheet pdf. Equivalent

RT8480 Datasheet
Recommendation RT8480 Datasheet
Part RT8480
Description High Voltage Boost/SEPIC Controller
Feature RT8480; ® RT8480 High Voltage Boost/SEPIC Controller General Description The RT8480 is a current mode PWM .
Manufacture Richtek
Datasheet
Download RT8480 Datasheet




Richtek RT8480
®
RT8480
High Voltage Boost/SEPIC Controller
General Description
The RT8480 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 RT8480 is available in a SOP-16 package.
Ordering Information
RT8480
Package Type
S : SOP-16
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Richtek 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
RT8480
GSYMDNN
RT8480GS : Product Number
YMDNN : Date Code
Features
High Voltage Capability : VIN Up to 36V, VOUT is
limited by External MOSFET Switch
Boost Operation
Current Mode PWM with Programmable Switching
Frequency
Easy Dimming Control : Analog or Digital
Converting to Analog with One External Capacitor
True PWM Dimming : External FET Driver is Build-
In
Programmable Soft-Start to Avoid Inrush Current
Programmable Over Voltage Protection
VIN Under Voltage Lockout and Thermal Shutdown
16-Lead SOP Package
RoHS Compliant and Halogen Free
Applications
General Industrial High Power LED Lighting
Desk Lights and Room Lighting
Building and Street Lighting
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
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8480-02 November 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1



Richtek RT8480
RT8480
Typical Application Circuit
4.5V to 3V6IVN
L1
47µH
CIN
10µF
RT8480
15 VCC
GATE 2
5V
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
CB
1µF
GND
16
R1
R2
VOUT
VOUT
14 LEDs
RSENSE
Figure 1. Analog Dimming in Boost Configuration
VIN
4.5V to 36V
5V
L1
47µH
1C0INµF
RT8480
15 VCC
GATE 2
12 EN
ISW 4
D1
COUT
1µF
M1
RSW
0.05
VOUT
14 LEDs
14 RSET
ISP 6
RRSET
30k
1R.V8Ck
1C0VnCF
PWM
10 DCTL
Dimming control
8 VC
ISN 7
11 SS
OVP 13
CSS
0.1µF
CB
1µF
1 GBIAS PWMOUT 3
9 ACTL PWMDIM 5
CA
0.47µF
GND
16
R1
R2
RSENSE
VOUT
Figure 2. PWM to Analog Dimming in Boost Configuration
VIN
4.5V to 36V
L1
47µH
1C0INµF
RT8480
15 VCC
GATE 2
5V
3R0RkSET
12 EN
14 RSET
9 ACTL
10 DCTL
ISW 4
PWMOUT 3
ISP 6
1R.V8Ck
1C0VnCF
CSS
0.1µF
8 VC
11 SS
1 GBIAS
ISN 7
PWMDIM 5
OVP 13
CB
1µF
GND
16
D1
COUT
1µF
M1
RSW
0.05
VOUT
14 LEDs
M2
RSENSE
R1
R2
VOUT
Figure 3. True PWM Dimming in Boost Configuration
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8480-02 November 2013



Richtek RT8480
VIN
10V to 36V
5V
L1
47µH
1C0INµF
RT8480
15 VCC
GATE 2
12 EN
ISW 4
RRSET
30k Analog
Dimming
1R.8VkC
1C0VnCF
C0.S1SµF
14 RSET
ISP 6
9 ACTL
10 DCTL
ISN 7
8 VC
11 SS
1 GBIAS
OVP 13
PWMOUT 3
PWMDIM 5
C1µBF GND
16
D1
M1
0R.S0W5
R1
R2
100k
190
VOUT
Figure 4. Constant Voltage Output of Boost Converter
VOUT
100V
RT8480
VIN
10V to 36V
5V
L1
47µH
1C0INµF
RT8480
15 VCC
GATE 2
12 EN
ISW 4
RRSET
30k Analog
Dimming
1R.V8Ck
1C0VnCF
CSS
0.1µF
14 RSET
ISP 6
9 ACTL
10 DCTL
ISN 7
8 VC
11 SS
1 GBIAS
OVP 13
PWMOUT 3
PWMDIM 5
C1µBF GND
16
1µF / 100V
D1
M1
RSW
0.05
L2
47µH
R1
R2
VOUT
24k
190
VOUT
24V
Figure 5. Constant Voltage Output of SEPIC Converter
VIN
10V to 36V
5V
L1
47µH
CIN
10µF
RT8480
15 VCC
GATE 2
12 EN
ISW 4
RRSET
30k Analog
Dimming
1R.V8Ck
1C0VnCF
C0.S1SµF
14 RSET
9 ACTL
10 DCTL
8 VC
11 SS
1 GBIAS
PWMOUT 3
ISP 6
ISN 7
PWMDIM 5
OVP 13
C1µBF GND
16
1µF / 100V
D1
M1
0R.S0W5
L2
47µH
R1
R2
VOUT
COUT
1µF
VOUT
24V
M2
190
Figure 6. True PWM Dimming in SEPIC Application
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8480-02 November 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3







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