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  Richtek Technology Electronic Components Datasheet  

RT8476 Datasheet

Two-Stage Hysteretic LED Driver Controller

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RT8476 pdf
®
RT8476
Two-Stage Hysteretic LED Driver Controller
General Description
The RT8476 is a two-stage controller with dual gate drivers
consist of a Boost converter (first stage) and a Buck
converter (second stage). The advantage of the two-stage
topology is highly compatible with ET (Electronic
Transformer) in MR16 / AR111 lighting market field
applications.
The first stage is a Boost converter for constant voltage
output with inductor peak current over current protection.
The second stage is a Buck converter for constant output
current by typical constant peak current regulation.
The RT8476 is equipped with dual output gate drivers for
external power MOSFETs, suitable for higher power
applications.
The RT8476 is available in the SOP-8 and SOP-8 (Exposed
pad) packages.
Applications
z MR16 Lighting
z Signage and Decorative LED Lighting
z Architectural Lighting
z High Power LED Lighting
z Low Voltage Industrial Lighting
z Indicator and Emergency Lighting
z Automotive LED Lighting
Features
z Two-Stage Topology (Boost + Buck)
z Wide Input Voltage Range : 4.5V to 40V
z Adjustable Peak Input Current Control
z Adjustable Boost Output Voltage
z Independent Dual Stage Function
z Adjustable LED Current with ±5% LED Current
Accuracy
z Input Under Voltage Lockout Detection
z Thermal Shutdown Protection
z SOP-8 and SOP-8 (Exposed Pad) Packages
z RoHS Compliant and Halogen Free
Ordering Information
RT8476
Package Type
S : SOP-8
SP : SOP-8 (Exposed Pad-Option 2)
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.
Simplified Application Circuit
VL
AC 12V
VN
L1 D6
D1 D2
CIN
D3 D4
COUT R4
RT8476
OVP
VCC
R5
M1
ISN
CREG
GATE1
CS
R6 GATE2
GND
RSENSE
D7
C3 L2
M2
LED+
C6
LED-
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8476-00 April 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT8476 Datasheet

Two-Stage Hysteretic LED Driver Controller

No Preview Available !

RT8476 pdf
RT8476
Marking Information
RT8476GS
RT8476
GSYMDNN
RT8476GS : Product Number
YMDNN : Date Code
RT8476GSP
RT8476
GSPYMDNN
RT8476GSP : Product Number
YMDNN : Date Code
Pin Configurations
(TOP VIEW)
GATE1
CS
OVP
GND
2
3
4
8 GATE2
7 CREG
6 VCC
5 ISN
SOP-8
GATE1
CS
OVP
GND
8
27
GND
36
9
45
GATE2
CREG
VCC
ISN
SOP-8 (Exposed Pad)
Functional Pin Description
Pin No.
SOP-8
SOP-8
(Exposed Pad)
Pin Name
1 1 GATE1
2 2 CS
3 3 OVP
4
4,
9 (Exposed Pad)
GND
5 5 ISN
6 6 VCC
7 7 CREG
8 8 GATE2
Pin Function
Gate Driver Output for External MOSFET Switch in the First Stage.
Current Sense Input for External MOSFET Switch.
Over Voltage Protection Sense Input.
Ground. The exposed pad must be soldered to a large PCB and
connected to GND for maximum power dissipation.
LED Current Sense Amplifier Negative Input.
Supply Voltage Input. For good bypass, place a ceramic capacitor
near the VCC pin.
Internal Regulator Output. Place an 1μF capacitor between the
CREG and GND pins.
Gate Driver Output for External MOSFET Switch in the Second
Stage.
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8476-00 April 2013


Part Number RT8476
Description Two-Stage Hysteretic LED Driver Controller
Maker Richtek
Total Page 16 Pages
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