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  Richtek Technology Electronic Components Datasheet  

RT8477A Datasheet

High Voltage High Multiple-Topology Current LED Driver

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®
RT8477A
High Voltage High Multiple-Topology Current LED Driver
General Description
The RT8477A is a current mode PWM controller designed
to drive an external MOSFET for high current LED
applications with wide input voltage (4.5V to 50V) and
output voltage (up to 50V) ranges. With internal 380kHz
operating frequency, the size of the external PWM inductor
and input/output capacitors can be minimized. High
efficiency is achieved by a 100mV current sensing control.
LED Dimming control can be done by analog.
The RT8477A is now available in the SOP-8 (Exposed
Pad) package.
Ordering Information
RT8477A
Package Type
SP : SOP-8 (Exposed Pad-Option 1)
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
Support Multiple-Topologies (Buck/Boost/Buck-
Boost)
High Voltage : VIN up to 50V, VOUT up to 50V
380kHz Fixed Switching Frequency
Analog or PWM Control Signal for LED Dimming
Internal Soft-Start to Avoid Inrush Current
Under-Voltage Lockout
Thermal Shutdown
Applications
Desk Lights and Room Lighting
Industrial Display Backlight
Pin Configurations
(TOP VIEW)
VCC
ISP
ISN
VC
8
27
GND
36
9
45
CREG
DRV
SENS
CTL
SOP-8 (Exposed Pad)
Marking Information
RT8477AGSP : Product Number
RT8477A
GSPYMDNN
YMDNN : Date Code
Simplified Application Circuit
VIN
Analog Dimming
C1
R5
RT8477A
VCC
C6
ISP
ISN
CTL DRV
CREG SENS
C2
GND
VC
R1
R4
C5
D1
LEDs
C4
L1
R3
C3
M1
R2
Copyright ©2018 Richtek Technology Corporation. All rights reserved.
DS8477A-04T00 December 2018
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT8477A Datasheet

High Voltage High Multiple-Topology Current LED Driver

No Preview Available !

RT8477A
Functional Pin Description
Pin No.
Pin Name
Pin Function
1
VCC
Supply Voltage Input. For good bypass, a low ESR capacitor is required.
2 ISP Positive Input Current Sense.
3 ISN Negative Input Current Sense. Voltage threshold between ISP and ISN is 100mV.
4 VC VC Compensation Node for Current Loop.
5 CTL Analog Dimming Control Input. Effective programming range is 0.33V to 2V.
6
SENS
Current Sense Input for LED Current. Connect the current sense resistor
between external N-MOSFET switch and the ground.
7
DRV
External MOSFET Switch Gate Driver Output.
8
CREG
Regulator Output. Placed 1F capacitor to stabilize the 5V regulator output.
9 (Exposed Pad) GND
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
Function Block Diagram
VCC
CREG
VC
4.5V
OSC
-
+
5V
LDO
Soft-Start
CTL
S
R
R
-
GM
+
+
-
DRV
SENS
ISN
ISP
GND
Copyright ©2018 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8477A-04T00 December 2018



Part Number RT8477A
Description High Voltage High Multiple-Topology Current LED Driver
Maker Richtek
Total Page 13 Pages
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RT8477A Datasheet PDF





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