900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




  Richtek Technology Electronic Components Datasheet  

RT8452 Datasheet

High Voltage High Current LED Driver Controller

No Preview Available !

®
RT8452
High Voltage High Current LED Driver Controller for Buck
Boost or Buck-Boost Topology
General Description
The RT8452 is a current mode PWM controller designed
to drive an external MOSFET for high current LED
applications. With a current sense amplifier threshold of
190mV, the LED current is programmable with one
external current sense resistor. With the maximum
operating input voltage of 36V and output voltage up to
48V, the RT8452 is ideal for Buck, Boost or Buck-Boost
operation.
With 350kHz operating frequency, the external inductor
and capacitors can be small while maintaining high
efficiency.
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 RT8452 is available in WQFN-16L 3x3 and SOP-16
packages.
Ordering Information
RT8452
Package Type
S : SOP-16
QW : WQFN-16L 3x3 (W-Type)
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.
Features
z High Voltage Capability : VIN Up to 36V, VOUT Up to
48V
z Buck, Boost or Buck-Boost Operation
z Current Mode PWM with 350kHz Switching
Frenquency
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 WQFN and SOP Packages.
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
15
14
13
12
11
10
9
SOP-16
GND
VCC
OVP
EN
NC
SS
DCTL
ACTL
16 15 14 13
GBIAS
GATE
PWMOUT
ISW
1
2
3
4
GND
17
12 NC
11 SS
10 DCTL
9 ACTL
5678
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8452-03 May 2012
WQFN-16L 3x3
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT8452 Datasheet

High Voltage High Current LED Driver Controller

No Preview Available !

RT8452
Marking Information
RT8452GS
RT8452
GSYMDNN
RT8452GS : Product Number
YMDNN : Date Code
RT8452GQW
F4=YM
DNN
F4= : Product Code
YMDNN : Date Code
Typical Application Circuit
VIN
4.5V to 36V
5V
Analog
Dimming
1R0VkC
3C.V3CnF
L1
47µH
D1
RSENSE
0.09
1C0INµF
RT8452
15 VCC
GATE 2
13 EN
ISW 4
M1
0R.S0W5
C0.S1SµF
9 ACTL
10 DCTL
8 VC
11 SS
1 GBIAS
C1µBF
ISP 6
ISN 7
OVP 14
PWMOUT 3
PWMDIM 5
GND
16, 17 (Exposed Pad)
COUT
1µF
R1
R2
VOUT
VOUT
48V (Max.)
14 LEDs
Figure 1. Analog Dimming in Boost Configuration
VIN
4.5V to 36V
5V
PWM
Dimming control
1R0VkC
3C.V3CnF
CSS
0.1µF
L1
47µH
D1
RSENSE
0.09
1C0INµF
RT8452
15 VCC
GATE 2
13 EN
ISW 4
M1
0R.S0W5
10 DCTL
ISP 6
8 VC
11 SS
1 GBIAS
ISN 7
OVP 14
PWMOUT 3
PWMDIM 5
C1µBF
9 ACTL
GND
C0.A47µF
16, 17 (Exposed Pad)
COUT
1µF
R1
R2
VOUT
VOUT
48V (Max.)
14 LEDs
Figure 2. PWM to Analog Dimming in Boost Configuration
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8452-03 May 2012


Part Number RT8452
Description High Voltage High Current LED Driver Controller
Maker Richtek
PDF Download

RT8452 Datasheet PDF






Similar Datasheet

1 RT8450 High Voltage Multi-Topology LED Driver
Richtek
2 RT8450B High Voltage Multi-Topology LED Driver
Richtek
3 RT8452 High Voltage High Current LED Driver Controller
Richtek
4 RT8453 High Voltage Buck LED Driver
Richtek
5 RT8453B High Voltage Buck LED Driver
Richtek
6 RT8456 Isolated Secondary Side LED Lighting Current Controller
Richtek
7 RT8458 High Efficiency PWM Buck LED Driver Controller
Richtek
8 RT8458A High Efficiency PWM Buck LED Driver Controller
Richtek
9 RT8458D Constant Current PWM Buck Controller
Richtek





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z



Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy