LED Driver. RT8453B Datasheet

RT8453B Driver. Datasheet pdf. Equivalent

RT8453B Datasheet
Recommendation RT8453B Datasheet
Part RT8453B
Description High Voltage Buck LED Driver
Feature RT8453B; RT8453B 1.5A, 500kHz, 40V High Voltage Buck LED Driver General Description The RT8453B is a buck c.
Manufacture Richtek
Datasheet
Download RT8453B Datasheet




Richtek RT8453B
RT8453B
1.5A, 500kHz, 40V High Voltage Buck LED Driver
General Description
The RT8453B is a buck current mode PWM regulator for
LED driving applications. It provides an integrated 1.5A
switch and can be operated with a wide input voltage range
from 4.5V to 40V. With a 500kHz operating frequency, the
RT8453B allows all external inductor and input/output
capacitors to be small. High efficiency is achieved with its
190mV current sensing capability. Dimming can be either
analog or PWM digital signal driven. The RT8453B is
available in a small SOP-8 (Exposed pad) package.
Ordering Information
RT8453B
Package Type
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.
Marking Information
RT8453B
GSPYMDNN
RT8453BGSP : Product Number
YMDNN : Date Code
Features
z Input Operating Range 4.5 to 40V
z 1.5A Switching Current Limitation
z 10% Constant Current Output Accuracy
z Current Mode PWM with 500kHz Switching
Frequency
z Analog or PWM Control Signal for LED Dimming
z Programmable Soft-Start
z Input Under Voltage Lockout
z Over Temperature Protection
z RoHS Compliant and Halogen Free
Applications
z General Illumination
z Desk Lights and Room Lighting
z Industrial Backlight/Lighting
z Constant Current Source
Pin Configurations
(TOP VIEW)
ISN
VC
ACTL
EN
8
27
GND
36
9
45
VCC
SW
GND
SS
SOP-8 (Exposed Pad)
DS8453B-01 May 2011
www.richtek.com



Richtek RT8453B
RT8453B
Typical Application Circuit
VIN
4.5V to 40V
Analog
Dimming
or
PWM
Dimming Control
5V
R5
10k
C6
3.3nF
C2
RT8453B
8 VCC
ISN 1
3 ACTL
R2
190mV
4 EN
2 VC
5 SS
C3
10nF
SW 7
L1
22µH
6, 9 (Exposed Pad)
GND
R3 R4
D1
C1
Functional Pin Description
Pin No.
1
2
3
Pin Name
ISN
VC
ACTL
Pin Function
Current Sense Amplifier Negative Input. Voltage threshold between VCC and ISN
is 190mV.
PWM Converter Loop Compensation Node.
Analog Dimming Control. Effective programming range is between 0.3V and 1.2V.
4 EN
5 SS
6,
9 (Exposed Pad)
GND
7 SW
8 VCC
Chip Enable (Active High). When low, chip is in shutdown mode.
Soft-Start. A capacitor of at least 10nF is required for soft-start.
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
PWM Converter Switch Node.
Power Supply of the Chip. For good bypass, a low ESR capacitor is required.
www.richtek.com
DS8453B-01 May 2011



Richtek RT8453B
Function Block Diagram
VCC
EN
VC
SS
ACTL
4.5V
1.4V
OSC
-
+
+ Shutdown
-
6µA
+
-
S
R
R
-
GM
+
SW
VCC
RT8453B
ISN
GND
VCC – VISN
(mV)
190
0 0.3
1.2
Figure 1
VACTL (V)
DS8453B-01 May 2011
www.richtek.com







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