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PDF RT8480 Data sheet ( Hoja de datos )
| Número de pieza | RT8480 | |
| Descripción | High Voltage Boost/SEPIC Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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®
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
1 page  
Function Block Diagram
RT8480
EN
RSET
VCC
OVP
VC
SS
DCTL
1.4V
4.5V
1.2V
8.5V
+ Shutdown
-
OSC
-
+
+
-
+
-
S
R
R
RR
VOC
5V
100k
GBIAS
- 110mV
+
6µA
-
GM
+
GBIAS
GATE
PWMOUT
PWMDIM
ISW
ISP
ISN
1.2V
+
-
+
-
GND
ACTL
VISP – VISN
(mV)
190
0 0.25
1.25
VACTL (V)
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8480-02 November 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
RT8480
0.240
0.235
0.230
0.225
0.220
0.215
0.210
0.205
0.200
4
ACTLThreshold vs. Input Voltage
11 18 25
Input Voltage(V)
32
39
Gate Output Voltage vs. Input Voltage
10
1nF Load
9
8
7 Gate_High
6
5
4
3
2
1 Gate_Low
0
4 11 18 25 32 39
Input Voltage(V)
PWM Dimming Response
GBIAS Voltage vs. Input Voltage
10
9
8
7
6
5
4
3
1nF Load
2
4 11 18 25 32 39
Input Voltage (V)
150
140
130
120
110
100
90
80
70
60
50
4
ISW Threshold vs. Input Voltage
11 18 25 32
Input Voltage (V)
39
Power On from EN
ACTL
(5V/Div)
GATE
(5V/Div)
VOUT
(50V/Div)
ILED
(500mA/Div)
VIN = 24V, fPWM = 1kHz, Duty = 50%
Time (500μs/Div)
EN
(5V/Div)
GATE
(5V/Div)
VOUT
(50V/Div)
ILED
(500mA/Div)
VIN = 24V, IOUT = 360mA, CSS = 0.1μF
Time (10ms/Div)
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8480-02 November 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet RT8480.PDF ] | |
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