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  Richtek Technology Electronic Components Datasheet  

RT8450B Datasheet

High Voltage Multi-Topology LED Driver

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RT8450B pdf
®
RT8450/B
High Voltage Multi-Topology LED Driver
General Description
The RT8450/B is a current mode PWM regulator for LED
driving applications. With an 1.5A switch on board and
wide input (4.5V to 40V) and/or output (up to 50V)ranges
the RT8450/B can operate in any of the three common
topologies : Buck, Boost or Buck-Boost.
With 800k/500kHz operating frequency, the external PWM
inductor and input/output capacitors can all be small. High
efficiency is achieved by a 190mV current sensing.
Dimming can be done either analog or PWM signal. An
unique built-in clampping comparator and filtering resistor
allow easy low noise analog dimming conversion from
PWM signal with only one external capacitor.
The RT8450/B is available in a TSSOP-16 (Exposed Pad)
and WDFN-12L 3x3 packages.
Ordering Information
RT8450/B
Package Type
CP : TSSOP-16 (Exposed Pad)
QW : WDFN-12L 3x3 (W-Type)
(Exposed Pad-Option 1)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Switching Frequency
500kHz
800kHz
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
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Features
High Voltage : VIN Up to 40V, VOUT Up to 50V
1.5A Switch Current
Buck, Boost or Buck-Boost Operation
Current Mode PWM with 800kHz (RT8450) and
500kHz (RT8450B) Switching Frenquency
Easy Dimming : Analog, PWM Digital or PWM
Converting to Analog with One External Capacitor
Programmable Soft-Start to Avoid Inrush Current
Programmable Over Voltage Protection to Limit
Output Voltage
VIN Under Voltage Lockout and Thermal Shutdown
RoHS Compliant and Halogen Free
Applications
GPS, Portable DVD Backlight
Desk Lights and Room Lighting
Industrial Display Backlight
Pin Configurations
(TOP VIEW)
ISP
ISN
VC
ACTL
DCTL
EN
OVP
SS
16
2 15
3 14
4
5
GND
13
12
6 17 11
7 10
89
VCC1
VCC2
SW
SW
GND
GND
GND
GND
TSSOP-16 (Exposed Pad)
ISP 1
ISN 2
VC 3
ACTL 4
DCTL 5
EN 6
GND
13
12 VCC2
11 VCC1
10 SW
9 GND
8 SS
7 OVP
WDFN-12L 3x3
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8450/B-05 August 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT8450B Datasheet

High Voltage Multi-Topology LED Driver

No Preview Available !

RT8450B pdf
RT8450/B
Typical Application Circuit
VIN
4.5V to 40V
5V
PWM
Dimming control
R1
10k
C2
3.3nF
C3
10nF
C1
RT8450/B
VCCx
ISP
EN ISN
DCTL
VC
SS
ACTL
OVP
GND
SW
C4
0.47µF
R2
190mV
R3 R4
C5
L
20µH
Figure 1. PWM to Analog Dimming Buck Configuration
VIN
4.5V to 40V
Analog
Dimming
5V
R1
10k
C2
3.3nF
C1
C3
10nF
RT8450/B
VCCx
ISP
ACTL
ISN
DCTL
EN
VC
OVP
GND
SS
SW
R2
190mV
L
15µH
R3 R4
C4
Figure 2. Analog Dimming Buck Configuration
VIN
4.5V to 40V
C1
RT8450/B
VCCx
ISP
PWM
Dimming control
ACTL
DCTL
ISN
OVP
5V EN GND
R1
10k
C2
3.3nF
C3
10nF
VC
SS
SW
19R0m2 V
L
15µH
R3 R4
C4
Figure 3. PWM Dimming Buck Configuration Through ACTL Pin
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8450/B-05 August 2014


Part Number RT8450B
Description High Voltage Multi-Topology LED Driver
Maker Richtek
Total Page 15 Pages
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